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1.
《印度化学会志》2023,100(6):101009
It is crucial to obtain a reliable electrolyte system that is used for replacing thermally unstable and the moisture sensitive LiPF6 salt in liquid electrolytes for developing excellent cycle stability lithium ion batteries with high safety. In this work, a kind of hybrid electrolytes, adding Ga–Bi co-doped Li7La3Zr2O12 (LLZO) into LiTFSI based commercial electrolyte, was successfully prepared. The results shows that adding Ga–Bi co-doped LLZO ceramic particles is benefit for enhancing conductivity of LiTFSI based commercial electrolyte, which is 3.14 mS cm−1 from 3.02 mS cm−1. Furthermore, the LiFePO4| |Li cell assembling with LiTFSI based electrolyte with Ga–Bi co-doped LLZO ceramic particles shows good cycle performance and coulomb efficiency (100% except for the initial cycle value of 88%) due to a passivation multi-element film formed for preventing severe corrosion to the Al foil. The battery delivered a high first cycle discharge capacity of 144.2 mAh g−1 (85% of theoretical LiFePO4.) and a maximum value of 152.6 mAh g−1 after the 69th cycle. After the 300 stable cycle, the capacity of 130.8 mAh g−1 (85.7% of the maximum data) remained. 相似文献
2.
J. Jin H.H. Li J.P. Wei X.K. Bian Z. Zhou J. Yan 《Electrochemistry communications》2009,11(7):1500-1503
Room temperature ionic liquid (RTIL) was prepared on basis of N-methyl-N-butylpiperidinium bis(trifluoromethanesulfonyl)imide (PP14TFSI), which showed a wide electrochemical window (?0.1–5.2 V vs. Li+/Li) and is theoretically feasible as an electrolyte for batteries with metallic Li as anodes. The addition of vinylene carbonate (VC) improved the compatibility of PP14TFSI-based electrolyte towards lithium anodes and enhanced the formation of solid electrolyte interphase film to protect lithium anodes from corrosion. Accordingly, Li/LiFePO4 cells initially delivered a discharge capacity of about 127 mAh g?1 at a current density of 17 mA g?1 in the ionic liquid with the addition of VC and showed better cyclability than in the neat ionic liquid. Electrochemical impedance spectroscopy disclosed that the addition of VC enhanced Li-ion diffusion and depressed interfacial resistance significantly. 相似文献
3.
《Electrochemistry communications》2008,10(5):691-694
The low-temperature performance of LiFePO4/C cathode in a quaternary carbonate-based electrolyte (1.0 M LiPF6/EC+DMC+DEC+EMC (1:1:1:3, v/v)) was studied. The discharge capacities of the LiFePO4/C cathode were about 134.5 mAh/g (20 °C), 114 mAh/g (0 °C), 90 mAh/g (−20 °C) and 69 mAh/g (−40 °C) using a 1C charge–discharge rate. Cyclic voltammetry measurements show obviously sluggish of the lithium insertion–extraction process of the LiFePO4/C cathode as the operation temperature falls below −20 °C. Electrochemical impedance analyses demonstrate that the sluggish of charge-transfer reaction on the electrolyte/LiFePO4/C interface and the decrease of lithium diffusion capability in the bulk LiFePO4 was the main performance limiting factors at low-temperature. 相似文献
4.
The newly created porous inorganic particles Li4.7Ag1.63GeS4.8 as filler are added into poly (ethylene oxide) (PEO) with LiTFSI salt, which greatly improves the electrochemical stability of solid-state PEO-based electrolytes against Li metal in a working battery. Due to many pores and channels in the filler, Li dendrites would grow along these channels thereby effectively inhibiting their fast spread in PEO matrix and retarding the short circuit on account of the penetration of Li dendrite. The Li+ conductivity of this solid-state electrolyte membrane could be 1.36 × 10-4 S/cm at 40 °C. The fabricated symmetrical Li metal cells could cycle above 550 h at 0.05 mA/cm2 and corresponding LiFePO4/Li all-solid-state cells have an excellent cycling stability of 160.65 mAh g-1 specific capacity after 200 cycles with 99.93% columbic efficiency at 50 °C environment. 相似文献
5.
Bo Jin Hal-Bon Gu Wanxi Zhang Kyung-Hee Park Guangping Sun 《Journal of Solid State Electrochemistry》2008,12(12):1549-1554
LiFePO4-C nanoparticles were synthesized by a hydrothermal method and subsequent high-energy ball-milling. Different carbon conductive
additives including nanosized acetylene black (AB) and multi-walled carbon nanotube (MWCNT) were used to enhance the electronic
conductivity of LiFePO4. The structural and morphological performance of LiFePO4-C nanoparticles was investigated by X-ray diffraction (XRD) and scanning electron microscopy. The electrochemical properties
of LiFePO4-C/Li batteries were analyzed by cyclic voltammetry and charge/discharge tests. XRD results demonstrate that LiFePO4-C nanoparticles have an orthorhombic olivine-type structure with a space group of Pnma. LiFePO4-C/Li battery with 5 wt% MWCNT displays the best electrochemical properties with a discharge capacity of 142 mAh g−1 at 0.25 C at room temperature. 相似文献
6.
Jing Chen Xuetian Deng Yiyang Gao Yuanjun Zhao Xiangpeng Kong Qiang Rong Junqiao Xiong Demei Yu Shujiang Ding 《Angewandte Chemie (International ed. in English)》2023,62(35):e202307255
All-solid-state lithium metal batteries (LMBs) are considered as the promising higher-energy and improved-safety energy-storage systems. Nevertheless, the electrolyte-electrodes interfacial issues due to the limited solid physical contact lead to discontinuous interfacial charge transport and large interfacial resistance, thereby suffering from unsatisfactory electrochemical performance. Herein, we construct an integrated cathode/polymer electrolyte for all-solid-state LMBs under the action of polymer chains exchange and recombination originating from multiple dynamic bonds in our well-designed dynamic supramolecular ionic conductive elastomers (DSICE) molecular structure. The DSICE acts as polymer electrolytes with excellent electrochemical performance and mechanical properties, achieving the ultrathin pure polymer electrolyte thickness (12 μm). Notably, the DSICE also functions as lithium iron phosphate (LiFePO4, LFP) cathode binders with enhanced adhesive capability. Such well-constructed Li|DSICE|LFP-DSICE cells generate delicate electrolyte-electrodes interfacial contact at the molecular level, providing continuous Li+ transport pathways and promoting uniform Li+ deposition, further delivering superior long-term charge/discharge stability (>600 cycles, Coulombic efficiency, >99.8 %) and high capacity retention (80 % after 400 cycles). More practically, the Li|DSICE|LFP-DSICE pouch cells show stable electrochemical performance, excellent flexibility and safety under abusive tests. 相似文献
7.
Zhixin Xu Prof. Jiulin Wang Prof. Jun Yang Xiaowei Miao Prof. Renjie Chen Ji Qian Rongrong Miao 《Angewandte Chemie (International ed. in English)》2016,55(35):10372-10375
The lithium–sulfur battery is regarded as one of the most promising candidates for lithium–metal batteries with high energy density. However, dendrite Li formation and low cycle efficiency of the Li anode as well as unstable sulfur based cathode still hinder its practical application. Herein a novel electrolyte (1 m LiODFB/EC‐DMC‐FEC) is designed not only to address the above problems of Li anode but also to match sulfur cathode perfectly, leading to extraordinary electrochemical performances. Using this electrolyte, lithium|lithium cells can cycle stably for above 2000 hours and the average Coulumbic efficiency reaches 98.8 %. Moreover, the Li–S battery delivers a reversible capacity of about 1400 mAh g?1sulfur with retention of 89 % for 1100 cycles at 1 C, and a capacity above 1100 mAh g?1sulfur at 10 C. The more advantages of this cell system are its outstanding cycle stability at 60 °C and no self‐discharge phenomena. 相似文献
8.
Shixi Yu Shao Dan Guoen Luo Wei Liu Ying Luo Xiaoyuan Yu Yueping Fang 《Journal of Solid State Electrochemistry》2012,16(4):1675-1681
Olivine LiFePO4/C cathode materials for lithium ion batteries were synthesized using monodisperse polystyrene (PS) nano-spheres and other
carbon sources. The structure, morphology, and electrochemical performance of LiFePO4/C were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), galvanostatic charge–discharge tests,
electrochemical impedance spectroscopy (EIS) measurements, and Raman spectroscopy measurements. The results demonstrated that
LiFePO4/C materials have an ordered olivine-type structure with small particle sizes. Electrochemical analyses showed that the LiFePO4/C cathode material synthesized from 7 wt.% PS nano-spheres delivers an initial discharge capacity of 167 mAh g-1 (very close to the theoretical capacity of 170 mAh g-1) at 0.1 C rate cycled between 2.5 and 4.1 V with excellent capacity retention after 50 cycles. According to Raman spectroscopy
and EIS analysis, this composite had a lower I
D/I
G, sp
3/sp
2 peak ratio, charge transfer resistance, and a higher exchange current density, indicating an improved electrochemical performance,
due to the increased proportion of graphite-like carbon formed during pyrolysis of PS nano-spheres, containing functionalized
aromatic groups. 相似文献
9.
Shaobo Ma Jingteng Zhao Qixin Gao Congying Song Huang Xiao Fang Li Prof. Guoxing Li 《Angewandte Chemie (International ed. in English)》2023,62(52):e202315564
The fast-charging capability of rechargeable batteries is greatly limited by the sluggish ion transport kinetics in anode materials. Here we develop an iodized polyacrylonitrile (I-PAN) anode that can boost the bulk/interphase lithium (Li)-ion diffusion kinetics and accelerate Li-ion desolvation process to realize high-performance fast-charging Li-ion batteries. The iodine immobilized in I-PAN framework expands ion transport channels, compresses the electric double layer, and changes the inner Helmholtz plane to form LiF/LiI-rich solid electrolyte interphase layer. The dissolved iodine ions in the electrolyte self-induced by the interfacial nucleophilic substitution of PF6− not only promote the Li-ion desolvation process, but also reuse the plated/dead Li formed on the anode under fast-charging conditions. Consequently, the I-PAN anode exhibits a high capacity of 228.5 mAh g−1 (39 % of capacity at 0.5 A g−1 delivered in 18 seconds) and negligible capacity decay for 10000 cycles at 20 A g−1. The I-PAN||LiNi0.8Co0.1Mn0.1O2 full cell shows excellent fast-charging performance with attractive capacities and negligible capacity decay for 1000 cycles at extremely high rates of 5 C and 10 C (1 C=180 mA g−1). We also demonstrate high-performance fast-charging sodium-ion batteries using I-PAN anodes. 相似文献
10.
Jun Ma Baohua Li Hongda Du Chengjun Xu Feiyu Kang 《Journal of Solid State Electrochemistry》2012,16(1):1-8
Nanocrystalline LiFePO4 and LiFe0.97Sn0.03PO4 cathode materials were synthesized by an inorganic-based sol–gel route. The physicochemical properties of samples were characterized
by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy, and
elemental mapping. The doping effect of Sn on the electrochemical performance of LiFePO4 cathode material was extensively investigated. The results showed that the doping of tin was beneficial to refine the particle
size, increase the electrical conductivity, and facilitate the lithium-ion diffusion, which contributed to the improvement
of the electrochemical properties of LiFePO4, especially the high-rate charge/discharge performance. At the low discharge rate of 0.5 C, the LiFe0.97Sn0.03PO4 sample delivered a specific capacity of 158 mAh g−1, as compared with 147 mAh g−1 of the pristine LiFePO4. At higher C-rate, the doping sample exhibited more excellent discharge performance. LiFe0.97Sn0.03PO4 delivered specific capacity of 146 and 128 mAh g−1 at 5 C and 10 C, respectively, in comparison with 119 and 107 mAh g−1 for LiFePO4. Moreover, the doping of Sn did not influence the cycle capability, even at 10 C. 相似文献
11.
合成了五种新的1-烷基-2,3-二甲基咪唑二(三氟甲基磺酰)亚胺离子液体(alkyl-DMimTFSI).以离子液体作为Li/LiFeO4电池电解液,分别考察不同烷基(正丁基、正戊基、正辛基、异辛基和正癸基)对电解液理化性质、界面性质和电池行为的影响.结果表明离子液体的电化学窗口都可以达到5.6V(-0.4~5.2Vvs.Li+/Li),显示它们具有较好的电化学稳定性.加入碳酸亚乙烯酯作为添加剂后,离子液体电解液在Li负极形成稳定的固体电解质相界面膜(SEI),从而提高了Li负极的稳定性,保护了Li片不受腐蚀.电化学阻抗和循环伏安分析进一步揭示LiFeO4正极与离子液体电解液也有良好的兼容性.此外,研究还表明离子液体中烷基种类严重影响它们的电池行为.采用butyl-DMimTFSI和amyl-DMimTFSI电解液体系的电池充放电容量和可逆性明显优于另外三种离子液体,它们的首次放电容量分别达到145和152.6mAh/g,并表现出良好的充放电循环性能.因粘度最大,采用isooctyl-DMimTFSI电解液的电池首次放电容量仅为8.3mAh/g,但添加碳酸丙烯酯(质量比1∶1)稀释后首次放电容量上升至132.4mAh/g. 相似文献
12.
《印度化学会志》2023,100(4):100959
The polymer-ceramic composite electrolytes have great application potential for next-generation solid state lithium batteries, as they have the merits to eliminate the problem of liquid organic electrolytes and enhancing chemical/electrochemical stability. However, polymer-ceramic composite electrolytes show poor ionic conductivity, which greatly hinders their practical applications. In this work, the addition of plasticizer ethylene carbonate (EC) into polymer-ceramic composite electrolyte for lithium batteries effectively promotes the ionic conductivity. A high ionic conductivity can be attained by adding 40 wt% EC to the polyethylene oxide (PEO)/polyvinylidene fluoride (PVDF)-Li7La3Zr2O12 (LLZO) based polymer-ceramic composite electrolytes, which is 2.64 × 10−4 S cm−1 (tested at room temperature). Furthermore, the cell assembled with lithium metal anode, this composite electrolyte, and LiFePO4 cathode can work more than 80 cycles at room temperature (tested at 0.2 C). The battery delivers a high reversible specific capacity after 89 cycles, which is 119 mAh g−1. 相似文献
13.
Wei Li Jierong Ying Chunrong Wan Changyin Jiang Jian Gao Changping Tang 《Journal of Solid State Electrochemistry》2007,11(6):799-803
Olivine-type LiFePO4 is a very promising polyanion-type cathode material for lithium-ion batteries. In this work, LiFePO4 with high specificity capacity is obtained from a novel precursor NH4FePO4·H2O via microwave processing. The grains grow up in the duration of sintering until they reach the decomposition temperature.
The apparent conductivity of the samples rises rapidly with the irradiation time and influences the electrochemical performance
of the material greatly at high current density. As a result, the LiFePO4 cathode material obtained with a sintering time of 15 min has good electrochemical performance. Between 2.5 and 4.2 V versus
Li, a reversible capacity is as high as 156 mAh g−1 at 0.05 C. 相似文献
14.
An Yongxin Cheng Xinqun Zuo Pengjian Liao Lixia Yin Geping 《Journal of Solid State Electrochemistry》2012,16(1):383-389
A new kind of polymer electrolyte is prepared from N-methyl-N-propylpiperidinium bis (trifluoromethanesulfonyl) imide (PP1.3TFSI), polyethylene oxide (PEO), and lithium bis (trifluoromethanesulfonyl)
imide (LiTFSI). IR and X-ray diffraction results demonstrate that the addition of ionic liquid decreases the crystallization
of PEO. Thermal and electrochemical properties have been tested for the solid polymer electrolytes, the addition of the room
temperature molten salt PP1.3TFSI to the conventional P(EO)20LiTFSI polymer electrolyte leads to the improvement of the thermal stability and the ionic conductivity (x = 1.27, 2.06 × 10−4 S cm−1 at room temperature), and the reasonable lithium transference number is also obtained. The Li/LiFePO4 cell using this polymer electrolyte shows promising reversible capacity, 120 mAh g−1 at room temperature and 164 mAh g−1 at 55 °C. 相似文献
15.
Chun-Chen Yang Ying-Chih Chen Zuo-Yu Lian Tzong-Horng Liou Jeng-Ywan Shih 《Journal of Solid State Electrochemistry》2012,16(5):1815-1821
This study reports on the preparation of a composite polymer electrolyte for secondary lithium-ion battery. Poly(vinylidiene
fluoride-hexafluoropropylene) (P(VDF-HFP)) was used as the polymer host, and mesoporous SBA-15 (silica) ceramic fillers used
as the solid plasticizer were added into the polymer matrix. The SBA-15 fillers with mesoporous structure and high specific
surface can trap more liquid electrolytes to enhance the ionic conductivity. The ionic conductivity of P(VDF-HFP)/SBA-15 composite
polymer electrolytes was in the order of 10−3 S cm−1 at room temperature. The characteristic properties of the composite polymer membranes were examined by using FTIR spectroscopies,
scanning electron microscopy (SEM), and an AC impedance method. For comparison, the LiFePO4/Li composite batteries with a conventional microporous polyethylene (PE) separator and pure P(VDF-HFP) polymer membrane were
also prepared and studied. As a result, the LiFePO4/Li composite battery comprised the P(VDF-HFP)/10 wt.% m-SBA-15 composite polymer electrolyte, which achieves an optimal discharge
capacity of 88 mAh g−1 at 20 C rate with a high coulomb efficiency of 95%. It is demonstrated that the P(VDF-HFP)/m-SBA-15 composite membrane exhibits
as a good candidate for application to LiFePO4 polymer batteries. 相似文献
16.
Xingchao Wang Yudai Huang Dianzeng Jia Zaiping Guo Duo Ni Ming Miao 《Journal of Solid State Electrochemistry》2012,16(1):17-24
Olivine LiFePO4/C nanocomposite cathode materials with small-sized particles and a unique electrochemical performance were successfully prepared
by a simple solid-state reaction using oxalic acid and citric acid as the chelating reagent and carbon source. The structure
and electrochemical properties of the samples were investigated. The results show that LiFePO4/C nanocomposite with oxalic acid (oxalic acid: Fe2+= 0.75:1) and a small quantity of citric acid are single phase and deliver initial discharge capacity of 122.1 mAh/g at 1
C with little capacity loss up to 500 cycles at room temperature. The rate capability and cyclability are also outstanding
at elevated temperature. When charged/discharged at 60 °C, this materials present excellent initial discharge capacity of
148.8 mAh/g at 1 C, 128.6 mAh/g at 5 C, and 115.0 mAh/g at 10 C, respectively. The extraordinarily high performance of LiFePO4/C cathode materials can be exploited suitably for practical lithium-ion batteries. 相似文献
17.
Yang Yang Xiao-Zhen Liao Zi-Feng Ma Bao-Feng Wang Li He Yu-Shi He 《Electrochemistry communications》2009,11(6):1277-1280
A facile chemical polymerization method was applied to prepare LiFePO4/C-PPy composite using Fe(III)tosylate as oxidant. The as-prepared LiFePO4/C-PPy sample with PPy content of approximately 4 wt% showed great rate capability with a discharge capacity of 115 mAh/g at 20C. High temperate cycling performance of the LiFePO4/C-PPy sample was compared with bare LiFePO4/C at 5C charge–discharge rate at 55 °C. The LiFePO4/C-PPy cathode showed superior cycling stability with an initial capacity of 155 mAh/g. Ninety percentage of this initial capacity was retained after 300 cycles, compared to 40% of that of bare LiFePO4/C. The LiFePO4/C-PPy electrode showed stable discharge plateau voltage of 3.35–3.25 V vs. Li+/Li during long term cycling. The superior performance of the LiFePO4/C-PPy electrode was due to the enhanced electrical conductivity, negligible iron dissolution and alleviated electrode cracking contributed by PPy coating. 相似文献
18.
Core–shell LiFePO4/C composite was synthesized via a sol–gel method and doped by fluorine to improve its electrochemical performance. Structural
characterization shows that F− ions were successfully introduced into the LiFePO4 matrix. Transmission electron microscopy verifies that F-doped LiFePO4/C composite was composed of nanosized particles with a ~3 nm thick carbon shell coating on the surface. As a cathode material
for lithium-ion batteries, the F-doped LiFePO4/C nanocomposite delivers a discharge capacity of 162 mAh/g at 0.1 C rate. Moreover, the material also shows good high-rate
capability, with discharge capacities reaching 113 and 78 mAh/g at 10 and 40 C current rates, respectively. When cycled at
20 C, the cell retains 86% of its initial discharge capacity after 400 cycles, demonstrating excellent high-rate cycling performance. 相似文献
19.
Dazhe Li Longbo Luo Jiadeng Zhu Haimei Qin Pengqing Liu Zhaomei Sun Yi Lei Mengjin Jiang 《中国化学快报》2022,33(2):1025-1031
Lithium metal is deemed as an ideal anode material in lithium-ion batteries because of its ultrahigh theoretical specific capacity and the lowest redox potential.However,the rapid capacity attenuation and inferior security resulting from the dendritic lithium growth severely limit its commercialization.Herein a novel hybrid gel polymer electrolyte (GPE) based on electrospun lithium sulfonated polyoxadiazole (LiSPOD) nanofibrous membrane swelled by lithium bis(trifluoromethanesulfonyl)imide (Li T... 相似文献
20.
Ziping Wang Shuyuan Xie Xuejie Gao Xinyang Chen Lina Cong Jun Liu Haiming Xie Chuang Yu Yulong Liu 《中国化学快报》2023,34(9):108151-317
Li metal is considered an ideal anode material because of its high theoretical capacity and low electrode potential. However, the practical usage of Li metal as an anode is severely limited because of inevitable parasitic side reactions with electrolyte and dendrites formation. At present, single-component artificial solid electrolyte interphase cannot simultaneously meet the multiple functions of promoting ion conduction, guiding lithium ion deposition, inhibiting dendrite growth, and reducing ... 相似文献