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1.
Long Wang Lin-Chao Zhang Ingo Lieberwirth Hong-Wei Xu Chun-Hua Chen 《Electrochemistry communications》2010,12(1):52-55
A monoclinic lithium vanadium phosphate (Li3V2(PO4)3) and carbon composite thin film (LVP/C) is prepared via electrostatic spray deposition. The film is studied with X-ray diffraction, scanning and transmission electron microscopy and galvanostatic cell cycling. The LVP/C film is composed of carbon-coated Li3V2(PO4)3 nanoparticles (50 nm) that are well distributed in a carbon matrix. In the voltage range of 3.0–4.3 V, it exhibits a reversible capacity of 118 mA h g?1 and good capacity retention at the current rate of 1 C, while delivers 80 mA h g?1 at 24 C. These results suggest a practical strategy to develop new cathode materials for high power lithium-ion batteries. 相似文献
2.
《Electrochemistry communications》2007,9(10):2496-2500
We report the first example of an intercalation compound based on the nitrogen framework in which lithium can be intercalated and deintercalated. A comparison of the structural and electrochemical properties of the ternary lithium cobalt, nickel and copper nitrides is performed. Vacancy layered structures of ternary lithium nitridocobaltates Li3−2xCoxN and nitridonickelates Li3−2xNixN with 0.10 ⩽ x ⩽ 0.44 and 0.20 ⩽ x ⩽ 0.60, respectively, are proved to reversibly intercalate Li ions in the 1 V–0.02 V potential range. These host lattices can accommodate up to 0.35 Li ion par mole of nitride. Results herein obtained support Li insertion in vacancies located in Li2N− layers while interlayer divalent cobalt and nickel cations are reduced to monovalent species. No structural strain is induced by the insertion–extraction electrochemical reaction which explains the high stability of the capacity in both cases. For the Li1.86Ni0.57N compound, a stable faradaic yield of 0.30 F/mol, i.e. 130 mAh/g, is maintained at least for 100 cycles. Conversely, the ternary copper nitrides corresponding to the chemical composition Li3−xCuxN with 0.10 ⩽ x ⩽ 0.40 do not allow the insertion reaction to take place due to the presence of monovalent copper combined with the lack of vacancies to accommodate Li ions. In the latter case, the discharge of the lithium copper nitrides is not reversible. 相似文献
3.
This work aims to maximize the number of active sites for energy storage per geometric area, by approaching the investigation to 3D design for microelectrode arrays. Self-organized Li4Ti5O12/TiO2/Li3PO4 composite nanoforest layer (LTL) is obtained from a layer of self organized TiO2/Li3PO4 nanotubes. The electrochemical response of this thin film electrode prepared at 700 °C exhibited lithium insertion and de-insertion at 1.55 and 1.57 V respectively, which is the typical potential found for lithium titanates. The effects of lithium phosphate on lithium titanate are explored for the first time. By cycling between 2.7 and 0.75 V the LTL/LiFePO4 full cell delivered 145 mA h g− 1 at an average potential of 1.85 V leading to an energy density of 260 W h kg− 1 at C/2. Raman spectroscopy revealed that the γ-Li3PO4/lithium titanate structure is preserved after prolonged cycling. This means that Li3PO4 plays an important role for enhancing the electronic conductivity and lithium ion diffusion. 相似文献
4.
《Electrochemistry communications》2008,10(10):1513-1516
In this paper, flower-like spinel Li4Ti5O12 consisting of nanosheets was synthesized by a hydrothermal process in glycol solution and following calcination. The as-prepared product was characterized by scanning electron microscopy, transmission electron microscopy, X-ray powder diffraction and cyclic voltammetry. The capacity of the sample used as anode material for lithium ion battery was measured. This structured Li4Ti5O12 exhibited a high reversible capacity and an excellent rate capability of 165.8 m Ahg−1 at 8 C, indicating potential application for lithium ion batteries with high rate performance and high capacity. 相似文献
5.
Yan-Hua Cui Ming-Zhe Xue Xiao-Lin Wang Ke Hu Zheng-Wen Fu 《Electrochemistry communications》2009,11(5):1045-1047
InP thin film has been successfully fabricated by pulsed laser deposition (PLD) and was investigated for its electrochemistry with lithium for the first time. InP thin film presented a large reversible discharge capacity around 620 mAh g?1. The reversibility of the crystalline structure and electrochemical reaction of InP with lithium were revealed by using ex situ XRD and XPS measurements. The high reversible capacity and stable cycle of InP thin film electrode with low overpotential made it one of the promise energy storage materials for future rechargeable lithium batteries. 相似文献
6.
《Electrochemistry communications》2008,10(5):719-722
Cycling stability, reversible capacity and rate performance of Li4Ti5O12 discharged to 0.01 V were investigated. A couple of obvious and repeatable peaks under 0.6 V observed by CV indicated that Li4Ti5O12 possessed reversible capacity below 0.6 V. When discharge voltage of Li4Ti5O12 extended from 0.6 to 0.01 V, its cycling stability was not affected and its reversible capacity and high rate performance were improved. Although the capacity obtained from 2.0 to 0.6 V gradually decreased with increasing the applied current density, the capacity obtained from 0.6 to 0.01 V showed little loss. AB was both electronic conducting additive and lithium-ion conducting additive for Li4Ti5O12 under 0.6 V. 相似文献
7.
Anqiang Pan Jun Liu Ji-Guang Zhang Wu Xu Guozhong Cao Zimin Nie Bruce W. Arey Shuquan Liang 《Electrochemistry communications》2010,12(12):1674-1677
Nano-structured Li3V2(PO4)3/carbon composite (Li3V2(PO4)3/C) has been successfully prepared by incorporating the precursor solution into a highly mesoporous carbon with an expanded pore structure. X-ray diffraction analysis, scanning electron microscopy, and transmission electron microscopy were used to characterize the structure of the composites. Li3V2(PO4)3 had particle sizes of < 50 nm and was well dispersed in the carbon matrix. When cycled within a voltage range of 3 to 4.3 V, a Li3V2(PO4)3/C composite delivered a reversible capacity of 122 mA h g? 1 at a 1C rate and maintained a specific discharge capacity of 83 mA h g? 1 at a 32C rate. These results demonstrate that cathodes made from a nano-structured Li3V2(PO4)3 and mesoporous carbon composite material have great potential for use in high-power Li-ion batteries. 相似文献
8.
We report the preparation and electrochemical properties of Na3V(PO3)3N made by ammonolysis. Na3V(PO3)3N is reversibly oxidized to Na2V(PO3)3N at high voltage (4.0 V vs. Na+/Na0 and 4.1 V vs. Li+/Li0) with an unusually small difference in the insertion/extraction voltage between both alkali metal reference electrodes. In both cases, the voltage hysteresis is extremely small (~ 0.035 V vs. sodium and ~ 0.065 V vs. lithium), which suggests facile migration of alkali cations within the structure. Further oxidation to NaV(PO3)3N is predicted to occur beyond the voltage stability window of the electrolytes. 相似文献
9.
《Electrochemistry communications》2007,9(5):1041-1046
Li0.93[Li0.21Co0.28Mn 0.51]O2 nanoparticles with an R-3m space group is hydrothermally prepared from Co0.35Mn0.65O2 obtained from an ion-exchange reaction with K-birnessite K0.32MnO2 at 200 °C. Even at a hydrothermal reaction temperature of 150 °C, the spinel (Fd3m) phase is dominant, and a layered phase became dominant by combining an increase in the temperature to 200 °C with an increase in lithium concentration. The as-prepared cathode particle has plate-like hexagonal morphology with a size of 100 nm and thickness of 20 nm. The first discharge capacity of the cathode is 258 mAh/g with an irreversible capacity ratio of 22%, and the capacity retention after 30 cycles is 95% without developing a plateau at ∼3 V. Capacity retention of the cathode discharge is 84% at 4C rate (=1000 mA/g) and shows full capacity recovery when decreasing the C rate to 0.1 C. 相似文献
10.
《Electrochemistry communications》2008,10(6):891-894
Hexagonal Li2MgSnO4 compound was synthesized at 800 °C using Urea Assisted Combustion (UAC) method and the same has been exploited as an anode material for lithium battery applications. Structural investigations through X-ray diffraction, Fourier Transform Infra Red spectroscopy and 7Li NMR (Nuclear Magnetic Resonance spectroscopy) studies demonstrated the existence of hexagonal crystallite structure with a = 6.10 and c = 9.75. An average crystallite size of ∼400 nm has been calculated from PXRD pattern, which was further evidenced by SEM images. An initial discharge capacity of ∼794 mA h/g has been delivered by Li2MgSnO4 anode with an excellent capacity retention (85%) and an enhanced coulombic efficiency (97–99%). Further, the Li2MgSnO4 anode material has exhibited a steady state reversible capacity of ∼590 mA h/g even after 30 cycles, thus qualifying the same for use in futuristic lithium battery applications. 相似文献
11.
S.Y. Yin L. Song X.Y. Wang Y.H. Huang K.L. Zhang Y.X. Zhang 《Electrochemistry communications》2009,11(6):1251-1254
The sodium lithium titanate with composition Na2Li2Ti6O14 has been synthesized by a sol–gel method. Thermogravimetric analysis and differential thermal analysis (TG–DTA) of the thermal decomposition process of the precursor and X-ray diffraction (XRD) data indicate the crystallization of sodium lithium titanate has occurred at about 600 °C. Electrochemical lithium insertion into Na2Li2Ti6O14 for lithium ion battery has been investigated for the first time. These results indicate the discharge and charge potential plateaus are about 1.3 V. The initial discharge capacity is much higher than the charge capacity and irreversible capacity exists in the voltage window 1–3 V. Subsequently, the discharge capacity decreases slowly, but the charge capacity increases slightly in the following cycles. After a few cycles, the specific capacity remains almost constant values and the sample exhibits the excellent retention of capacity on cycling. 相似文献
12.
Hui-Juan Wang Jian-Ming Wang Wen-Bin Fang Hui Wan Liang Liu Hui-Qin Lian Hai-Bo Shao Wei-Xiang Chen Jian-Qing Zhang Chu-Nan Cao 《Electrochemistry communications》2010,12(2):194-197
A B2O3-doped SnO2 thin film was prepared by a novel experimental procedure combining the electrodeposition and the hydrothermal treatment, and its structure and electrochemical properties were investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) analysis, energy dispersive X-ray (EDX) spectroscopy and galvanostatic charge–discharge tests. It was found that the as-prepared modified SnO2 film shows a porous network structure with large specific surface area and high crystallinity. The results of electrochemical tests showed that the modified SnO2 electrode presents the largest reversible capacity of 676 mAh g?1 at the fourth cycle, close to the theoretical capacity of SnO2 (790 mAh g?1); and it still delivers a reversible Li storage capacity of 524 mAh g?1 after 50 cycles. The reasons that the modified SnO2 film electrode shows excellent electrochemical properties were also discussed. 相似文献
13.
X.Q. Yu Y. He J.P. Sun K. Tang H. Li L.Q. Chen X.J. Huang 《Electrochemistry communications》2009,11(4):791-794
Nanocrystalline MnO thin film has been prepared by a pulsed laser deposition (PLD) method. The reversible lithium storage capacity of the MnO thin film electrodes at 0.125C is over 472 mAh g?1 (3484 mAh cm?3) and can be retained more than 90% after 25 cycles. At a rate of 6C, 55% value of the capacity at 0.125C rate can be obtained for both charge and discharge. As-prepared MnO thin film electrodes show the lowest values of overpotential for both charge and discharge among transition metal oxides. All these performances make MnO a promising high capacity anode material for Li-ion batteries. 相似文献
14.
《Electrochemistry communications》2007,9(5):857-862
Microarray electrodes of LiMn2O4 and Li4/3Ti5/3O4 were prepared on a glass substrate using a sol–gel method. The prepared LiMn2O4 and Li4/3Ti5/3O4 microarray electrodes were characterized with scanning electron microscopy, Raman spectroscopy, and cyclic voltammetry. Using a polymer-gel electrolyte, lithium ion microbattery of Li4/3Ti5/3O4/polymer-gel/LiMn2O4 (cell area: 6.6 × 10−2 cm2) was successfully constructed. The microbattery operated reversibly at 2.5 V, and the discharge capacity was 300 nA h, which corresponded to an energy density of 11 μW h cm−2. 相似文献
15.
A hierarchical micro/nanostructured Li-rich layered 0.5Li2MnO3·0.5LiMn0.4Ni0.3Co0.3O2 (H-LMNCO) material is prepared for the first time through the development of a solvothermal method, and served as cathode of lithium ion batteries. Electrochemical tests indicate that the H-LMNCO exhibits both a high reversible capacity and an excellent rate capability. The reversible discharge capacity of the H-LMNCO has been measured as high as 300.1 mAh·g− 1 at 0.2 C rate. When the rate is increased to 10 C, the discharge capacity could still maintain a high value of 163.3 mAh·g− 1. The results demonstrate that the developed solvothermal route is a novel synthesis strategy of preparing high rate performance Li-rich layered cathode material for lithium ion batteries. 相似文献
16.
In this work, a room temperature solid-state rechargeable sodium ion cell, consisting of a ceramic Na-β″-Al2O3 thin film as the electrolyte, a NaTi2(PO4)3 gel composite as the cathode and sodium metal as the anode, was developed for the first time. A dense Na-β″-Al2O3 thin film with a thickness of approximately 100 μm was obtained by non-toxic and hazard-free ceramic fabrication processes, including tape-casting and subsequent sintering. The solid-state sodium ion cell had a working window of 1.5–2.5 V upon charge-discharge processes and exhibited an extremely stable voltage plateau of approximately 2.1 V. A reversible capacity, based on the NaTi2(PO4)3 cathode, of 133 mAh g− 1 was observed during the first cycle, which remained approximately 100 mAh g− 1 after 50 cycles. 相似文献
17.
《Electrochemistry communications》2008,10(12):1876-1878
A composite of silica (SiO2) and hard carbon was prepared by hydrothermal reaction. Special attention was paid to the characterization of the possible electrochemical reduction of nano-SiO2 in the composite. Evidence by solid-state nuclear magnetic resonance (NMR) and X-ray photoelectron spectroscopy (XPS) and high lithium storage capacity of the composite prove the electrochemical reduction of nano-SiO2 and the formation of Li4SiO4 and Li2O as well as Si in the first-discharge. The reversible lithium storage capacity of the nano-SiO2 is as high as 1675 mAh/g. 相似文献
18.
R. Yang J. Zheng J. Huang X.Z. Zhang J.L. Qu X.G. Li 《Electrochemistry communications》2010,12(6):784-787
Vertically aligned Indium oxide (In2O3) nanoblades are successfully obtained through plasma enhanced chemical vapor deposition (PECVD) approach. By using plasma, the reaction between InCl3 and O2 was able to take place, yielding vertically aligned blade like nanostructure. The novel In2O3 nanostructures exhibit improved electrochemical properties when used as anode materials for lithium-ion batteries. The In2O3 electrode reveals reversible capacity of 580 mAh g?1 after 100 cycles, much higher than that of the In2O3 thin films. The result suggests that proper structural modification of In2O3 thin film may contribute to the improvement of electrochemical properties. The In2O3 electrodes with large reversible capacity and stable cycling performance may provide new insight of anode materials applied in thin film lithium-ion batteries. 相似文献
19.
《Electrochemistry communications》2007,9(6):1404-1409
Lithium-rich Li1.05Mn2O4 hollow nanospheres have been successfully prepared by air-calcining lithiated MnO2 precursor at a low temperature of 550 °C, which was synthesized by chemical lithiation of hollow MnO2 nanospheres with LiI at 70 °C for 12 h. The lithium-rich Li1.05Mn2O4 hollow nanospheres exhibit an excellent cycling stability and rate capability as a cathode material for rechargeable lithium batteries: it maintains 90% of its initial capacity after 500 cycles, and keeps 70% of the reversible capacity at 0.1 C rat, even at 15 C rate. 相似文献
20.
A neutral polymer electrolyte comprised of lithium sulfate (Li2SO4) and polyacrylamide (PAM) was developed. The Li2SO4-PAM electrolyte film shows an ionic conductivity up to 10 mS cm− 1 in 45%RH conditions. Solid double layer capacitors were demonstrated using CNT-graphite electrodes and Li2SO4-PAM solid electrolytes. The voltage window of the solid cell was about 2.0 V, identical to that of a Li2SO4 liquid cell used as baseline. The demonstrated voltage window is significantly larger than that reported for proton- or hydroxyl-conducting electrolytes, suggesting that the Li2SO4-PAM electrolyte is a promising system for high energy density supercapacitors. The solid device also demonstrated excellent rate capability (up to 5 V s− 1) and good cycle life (beyond 10,000 charge/discharge cycles). 相似文献