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1.
《中国化学快报》2020,31(5):1221-1225
MnS as anode material for sodium-ion batteries (SIBs) has recently attracted great attention because of the high theoretical capacity, great natural abundance, and low cost. However, it suffers from inferior electrical conductivity and large volume expansion during the charge/discharge process, leading to tremendous damage of electrodes and subsequently fast capacity fading. To mitigate these issues, herein, a three-dimensional (3D) interlaced carbon nanotubes (CNTs) threaded into or between MnS hollow microspheres (hollow MnS/CNTs composite) has been designed and synthesized as an enhanced anode material. It can effectively improve the electrical conductivity, buffer the volume change, and maintain the integrity of the electrode during the charging and discharging process based on the synergistic interaction and the integrative structure. Therefore, when evaluated as anode for SIBs, the hollow MnS/CNTs electrode displays enhanced reversible capacity (275 mAh/g at 100 mA/g after 100 cycles), which is much better than that of pure MnS electrode (25 mAh/g at 100 mA/g after 100 cycles) prepared without the addition of CNTs. Even increasing the current density to 500 mA/g, the hollow MnS/CNTs electrode still delivers a five times higher reversible capacity than that of the pure MnS electrode. The rate performance of the hollow MnS/CNTs electrode is also superior to that of pure MnS electrode at various current densities from 50 mA/g to 1000 mA/g. 相似文献
2.
Ling Wang Changzheng Lin Tingyi Liang Ning Wang Jiangtao Feng Wei Yan 《Materials Today Chemistry》2022
Metal selenides are promising anodes for sodium-ion batteries (SIBs) due to the high theoretical capacity through conversion reaction mechanism. However, developing metal selenides with superior electrochemical sodium-ion storage performance is still a great challenge. In this work, a novel composite material of free-standing NiSe2 nanoparticles encapsulated in N-doped TiN/carbon composite nanofibers with carbon nanotubes (CNTs) in-situ grown on the surface (NiSe2@N-TCF/CNTs) is prepared by electrospinning and pyrolysis technique. In this composite materials, NiSe2 nanoparticles on the surface of carbon nanofibers were encapsulated into CNTs, thus avoiding aggregation. The in-situ grown CNTs not only improve the conductivity but also act as a buffer to accommodate the volume expansion. TiN inside the nanofibers further enhances the conductivity and structural stability of carbon-based nanofibers. When directly used as anode for SIBs, the NiSe2@N-TCF/CNT electrode delivered a reversible capacity of 392.1 mAh/g after 1000 cycles and still maintained 334.4 mAh/g even at a high rate of 2 A/g. The excellent sodium-ion storage performance can be attributed to the fast Na+ diffusion and transfer rate and the pseudocapacitance dominated charge storage mechanism, as is evidenced by kinetic analysis. The work provides a novel approach to the fabrication of high-performance anode materials for other batteries. 相似文献
3.
Caixian Chang Jiangfeng Xiang Ming Li Xiaoyan Han Liangjie Yuan Jutang Sun 《Journal of Solid State Electrochemistry》2009,13(3):427-431
A sulfur-substituted disordered carbon is explored as anode material for lithium-ion battery. Its physical and electrochemical
properties are characterized by a variety of techniques such as powder X-ray diffraction, element analysis, Fourier transform
infrared spectrum, scanning electron microscopy, and typical electrochemical tests. Electrochemical tests show the activated
carbon displays a first cycle discharge capacity of 1,216 mAh·g−1. It also has a remarkable cycling stability with an average capacity fade of 0.92% per cycle from 11th to 100th cycle in
the range of 0.01–3.00 V versus metallic lithium at a current density of 100 mA·g−1. After 100 cycles, the electrode still maintained a capacity of 420 mAh·g−1. 相似文献
4.
《中国化学快报》2021,32(10):3113-3117
The research of borate materials as sodium-ion batteries (SIBs) anode is still in the early stages, but the boron polyoxoanions are attracting intense interest due to their low atomic weight and high electronegative features. In this work, FeBO3 was prepared with low-cost raw materials and evaluated as SIBs anode. The FeBO3 shows a high reversible capacity of 328 mAh/g at the current density of 0.4 A/g. In addition, the electrochemical performance of FeBO3 can be improved by carbon coating. The prepared carbon-coated FeBO3 composite has a reversible capacity of 426 mAh/g (at 0.4 A/g) and an outstanding rate capability of 272 mAh/g (at 1.6 A/g). Furthermore, the sodium storage mechanism of FeBO3 was studied by in-situ XRD and ex-situ XPS. 相似文献
5.
Yu Zhang Li Fang Wang Sun Bin Shi Xiaotao Chen Yujie Gu Kunpeng Ding Zhenhua Wang Kening Sun 《中国化学快报》2021,32(3):1144-1148
The development of novel anode materials,with superior rate capability,is of utmost significance for the successful realization of sodium-ion batteries(SIBs).Herein,we present a nanocomposite of Nb_2 O_5 and reduced graphene oxide(rGO) by using hydrothermal-assisted microemulsion route.The water-in-oil microemulsion formed nanoreactors,which restrained the particle size of Nb_2 O_5 and shortened the diffusion length of ions.Moreover,the rGO network prevented agglomeration of Nb_2 O_5 nanoparticles and improved electronic conductivity.Consequently,Nb_2 O_5@rGO nanocomposite is employed as anode material in SIBs,delivering a capacity of 195 mAh/g after 200 charge/discharge cycles at 0.2 A/g.Moreover,owing to conductive rGO network,the Nb_2 O_5@rGO electrode rende red a specific capacity of 76 mAh/g at high current density of 10 A/g and maintained 98 mAh/g after 1000 charge/discharge cycles at 2 A/g.The Nb_2 O_5@rGO electrode material prepared by microemulsion method shows promising possibilities for application of SIBs. 相似文献
6.
In this work,via a facile solvothermal route,we synthesized an anode material for lithium ion batteries(LIBs)—SnS_2 nanoparticle/graphene(SnS_2 NP/GNs) nanocomposite.The nanocomposite consists of SnS_2nanoparticles with an average diameter of 4 nm and graphene nanosheets without restacking.The SnS_2 nanoparticles are firmly anchored on the graphene nanosheets.As an anode material for LIBs,the nanocomposite exhibits good Li storage performance especially high rate performance.At the high current rate of 5,10,and 20 A/g,the nanocomposite delivered high capacities of 525,443,and 378 mAh/g,respectively.The good conductivity of the graphene nanosheets and the small particle size of SnS_2contribute to the electrochemical performance of SnS_2 NP/GNs. 相似文献
7.
Wenchao Zhou Shailesh Upreti M. Stanley Whittingham 《Electrochemistry communications》2011,13(10):1102-1104
The Si/MgO/graphite composite was synthesized by high energy ball-milling and evaluated as a durable anode for lithium-ion batteries. EDX mapping indicated that Si was dispersed homogeneously in the MgO matrix. The composite delivered an initial capacity of ~ 700 mAh/g and maintained a capacity of 630 mAh/g after 74 cycles at 0.5 mA/cm2; even at 8 mA/cm2 it delivered more than 85% of its capacity. Its volumetric capacity is double that of carbon. The coulombic efficiency climbed from 77% in the first cycle to above 99.5% after 20 cycles, and retained that value. 相似文献
8.
SnS2 is considered as an attractive anode material to substitute commercial graphite anodes of lithium-ion batteries due to its high specific capacity of 645 mAh·g-1 as well as low cost. Nevertheless, it suffers poor large volume expansion during the lithiation/delithiation processes, leading to the loss of electrical contact and rapid capacity fading. Herein, by using a facile one-step solvothermal method, SnS2 nanoflower/graphene nanocomposites (SnS2 NF/GNs) were prepared, where flower-like SnS2 hierarchical nanostructures consisting of ultrathin nanoplates, are tightly enwrapped in graphene nanosheets. As anode materials for lithium-ion batteries, the SnS2 NF/GNs electrode exhibit superior electrochemical performance, with a reversible capacity of 523 mAh·g-1 after 200 charge-discharge cycles. The enhanced Li storage performance was attributed to the synergistic effect of SnS2 and graphene. The SnS2 NF can effectively accommodate the volume change and shorten Li+ diffusion distance, while graphene nanosheets can further alleviate the volume expansion of SnS2 and improve the electronic conductivity. 相似文献
9.
《中国化学快报》2020,31(9):2325-2329
As electrodes, two-dimensional materials show special advantages including the infinite planar lengths, broad electrochemical window, large surface–volume ratio, and much exposed active sites. In theory, the two-dimensional materials consist of the elements with high electronegativity may absorb more Na atoms, resulting in a high battery storage capacity. Based on the above idea, we selected the two dimensional metallic PS2 with 1T-Type structure as an anode material, and explored its potential applications as an electrode material for Na-ion battery through first-principle calculations. As we expected, when two dimensional PS2 is used as an anode in Na-ion battery, it can adsorb maximum three layers of sodium atoms on both sides of the monolayer, resulting in a maximum theoretical capacity of 1692 mAh/g. Furthermore, it also possesses a rather small sodium diffusion barrier of 0.17 eV, a low average open-circuit voltage of 0.18 V, and a relatively small lattice changes within 13% during the intercalation of Na. These results suggested that the two dimensional PS2 is a potentially excellent Na-ion battery anode. Our idea of designing two-dimensional anode materials with high storage capacity may provide some references for designing the next generation anode materials of metal-ion batteries. 相似文献
10.
HU Rong FANG Yongzheng LIU Xiaoyu ZHU Kai CAO Dianxue YI Jin WANG Guiling 《高等学校化学研究》2021,37(2):311-317
Potassium(K)ion batteries present their promising application for large-scale energy storage systems with cost-effective characteristic.Unfortunately,the large K ion radius results in sluggish K ion diffusion kinetics and volume expansion of the electrode during the K ion insertion/extraction process.It is a challenge to explore capable anode materials with remarkable K ion storage ability.Herein,we design and prepare SnS2 ultrathin nanosheets via a facile hydrothermal process.When severing as anode materials for K ion batteries with optimized electrolyte,SnS2 presents an improved capacity and rate ability.The capable electrochemical performance is ascribed to the reduced ion diffusion pathway and capacitor-dominated K-ion storage process.In addition,the K ion storage mechanism of SnS2 is investigated by the ex-situ X-ray diffraction technique. 相似文献
11.
Bingbing Deng Lian Shen Yangai Liu Tao Yang Manshu Zhang Renjie Liu Zhaohui Huang Minghao Fang Xiaowen Wu 《中国化学快报》2017,28(12):2281-2284
A novel porous silicon was synthesized through a magnesiothermic reduction method of molecular sieve for the first time, the porous silicon was used as anode material, which shows a high initial specific capacity of 2018.5 mAh/g with current density of 0.1 A/g. 相似文献
12.
ANG Zuojun WU Xueyan MA Chao HOU Chengcheng XU Shumao WEI Xiao WANG Kaixue CHEN Jiesheng 《高等学校化学研究》2020,36(1):91-96
Metal selenides as anode materials for sodium-ion batteries have attracted considerable attention owing to their high theoretical specific capacities and variable composition and structures.However,the achievement of long cycle life and superior rate performance is challenging for these selenide materials due to the volume variation upon cycling.Herein,a composite composed of a new binary-metal selenide[Cu2SnSe3(CSS)]and carbon nanotubes(CNTs)was constructed via a hydrothermal process followed by calcination at 600℃.Benefited from the unique structure of binary-metal selenide and the conductive network of CNTs,the Cu2SnSe3/carbon nanotubes(CSS/CNT)composite exhibits excellent electrochemical performance when used as an anode material for sodium-ion batteries.A reversible specific capacity of 399 mA·h/g can be maintained at a current density of 100 mA/g even after 100 cycles.This work provides a promising strategy for rational design of binary-metal selenides upon delicate crystal phase control as electrode materials. 相似文献
13.
以金属氯化物为金属源,硫脲为硫源,聚乙二醇和乙二醇为混合溶剂,采用溶剂热法一步合成了球形的铜锌锡硫纳米颗粒.利用X射线衍射仪(XRD),扫描电子显微镜(SEM)和透射电子显微镜(TEM)分析了铜锌锡硫纳米颗粒的物相、结构、形貌;利用电池测试系统对以铜锌锡硫纳米颗粒为锂离子电池负极材料组装的锂离子电池的电化学性能进行了测试.结果表明:所得到的产物为具有锌黄锡矿结构的纯相铜锌锡硫,颗粒直径在300~500nm.铜锌锡硫纳米颗粒作为锂离子电池的负极材料具有较好的稳定性,有望在锂离子电池研究和应用中得到推广. 相似文献
14.
Volkov Alexey I. Eliseeva Svetlana N. Tolstopjatova Elena G. Kondratiev Veniamin V. 《Journal of Solid State Electrochemistry》2020,24(7):1607-1614
Journal of Solid State Electrochemistry - A simple and green approach for creating a highly capacitive molybdenum disulphide (MoS2) anode material for lithium-ion batteries is proposed. The... 相似文献
15.
Nb2O5/C nanosheets are successfully prepared through a mixing process and followed by heating treatment.Such Nb2O5/C based electrode exhibits high rate performance and remarkable cycling ability, showing a high and stable specific capacity of ~380 mAh g-1 at the current density of 50 mA g-1(much higher than the theoretical capacity of Nb2O5).Further more,at a current density of 500 mA g-1,the nanocomposites electrode still exhibits a specific capacity of above 150 mAh g-1 after 100 cycles.These results suggest the Nb2O5/C nanocomposite is a high performance anode material for lithium-ion batteries. 相似文献
16.
Baolin Xu Shihan Qi Fang Li Xiaoxin Peng Jinfeng Cai Jiaojiao Liang Jianmin Ma 《中国化学快报》2020,31(1):217-222
Hard carbon is regarded as promising anode materials for potassium-ion batteries(KIBs)owing to their low price and easy availability.However,the limited rate capability still needs to be improved.Herein,we demonstrate the fabrication of oxygen/sulfur co-doped hard carbon through a facile hydrolyzationsulfuration process of skimmed cotton.The simultaneous dopants significantly improve potassium ion diffusion rate.When served as the anode for KIBs,this hydrolyzed hard carbon delivered a high reversible capacity(409 mAh/g at 0.1 A/g),superior rate capability(135 mAh/g at 2 A/g)and excellent cyclability(about 120 mAh/g overt 500 cycles at 2 A/g).This work provides a facile strategy to prepare low-cost doped-hard carbon with superior potassium storage property. 相似文献
17.
Carbon-coated Li_4Ti_5O_(12) sample was synthesized by a sol-gel method. The Li_4Ti_5O_(12) powders were obtained by calcinations of the gels at 750, 800, 850,900 ℃ at N_2 atmosphere. The structure, morphology and electrochemical properties of the materials were characterized by SEM, XRD and charge and discharge. The final product sintered at 850 ℃ demonstrates excellent performance with a specific capacity of 163.5 mAh/g after 100 cycles at 1C. Furthermore, the discharge specific capacity of the sample can retain 80 mAh/g at 10C. 相似文献
18.
Hongdong Liu 《Journal of Sol-Gel Science and Technology》2014,72(3):644-647
The SnO2 sheet/graphite composite was synthesized by a hydrothermal method for high-capacity lithium storage. The microstructures of products were characterized by XRD and FE-SEM. The electrochemical performance of SnO2 sheet/graphite composite was measured by galvanostatic charge/discharge cycling and EIS. The first discharge and charge capacities are 1,072 and 735 mAh g?1 with coulombic efficiency of 68.6 %. After 40 cycles, the reversible discharge capacity is still maintained at 477 mAh g?1. The results show that the SnO2 sheet/graphite composite displays superior Li-battery performance with large reversible capacity and good cyclic performance. 相似文献
19.
采用喷雾热解法合成了碳包覆的SnSb/C合金复合材料,利用X射线粉末衍射仪(XRD)、场发射扫描电子显微镜(FESEM)、透射电子显微镜(TEM)等方法对产物的物相和形貌进行了表征,其中SnSb/C颗粒为10 nm左右的复合材料(10-SnSb/C)作为钠离子电池负极时,表现出优异的循环和倍率性能。首圈放电达到722.1m Ah·g~(-1),首圈库仑效率86.3%,在100、1000、3000 m A·g~(-1)下比容量分别为607.7、645.4、452.2 m Ah·g~(-1),在1000 m A·g~(-1)电流下循环200周后可逆容量达到623 m Ah·g~(-1),容量保持率为95%。SnSb/C复合材料出色的储钠性能源于其完全被碳包裹的纳米结构,该结构可以有效提高活性物质的利用率,促进电子、离子的传导,并且抑制纳米粒子在长循环过程中的粉化和团聚。 相似文献
20.
We report the electrochemical performance of carbon-coated TiO2 nanobarbed fibers (TiO2@C NBFs) as anode material for lithium-ion batteries. The TiO2@C NBFs are composed of TiO2 nanorods grown on TiO2 nanofibers as a core, coated with a carbon shell. These nanostructures form a conductive network showing high capacity and C-rate performance due to fast lithium-ion diffusion and effective electron transfer. The TiO2@C NBFs show a specific reversible capacity of approximately 170 mAh g− 1 after 200 cycles at a 0.5 A g− 1 current density, and exhibit a discharge rate capability of 4 A g− 1 while retaining a capacity of about 70 mAh g− 1. The uniformly coated amorphous carbon layer plays an important role to improve the electrical conductivity during the lithiation–delithiation process. 相似文献