Preparation of Ga-doped lithium trivanadates as cathode materials for lithium-ion batteries
Preparation of Ga-doped lithium trivanadates as cathode materials for lithium-ion batteries
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锂离子电池正极材料Ga掺杂三钒酸锂的制备
DOI：
10.1016/j.electacta.2011.12.099
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发表时间：
2012-02
影响因子：
6.6
通讯作者：
Liu Jianhong
中科院分区：
文献类型：
--
作者：
Ren Xiangzhong;Hu Shengming;Shi Chuan;Zhang Peixin;Yuan Qiuhua;Liu Jianhong
采用溶胶凝胶法制备了系列掺镓三钒酸锂LiV3−xGaxO8(x=0.0 0，0.0 2，0.0 4，0.0 6，0.0 8)作为正极材料。用X射线衍射仪(XRD)、傅立叶变换红外光谱(FTIR)和扫描电子显微镜(SEM)对样品的晶体结构和微观结构进行了表征。用充放电循环性能、循环伏安(CV)和电化学阻抗谱(EIS)对其电化学性质进行了表征。充放电测试表明，掺杂Ga3+改善了LiV3O8的电化学性能，其中LiV2.94Ga0.06O8的电化学性能最好，在0.1C的充放电倍率下，在1.8~4.0V的电压范围内，50次循环后的放电容量为277(±3)mAhg−1，循环稳定容量为226(±3)mAhg−1。LiV2.94Ga0.06O8电极在较高倍率下也表现出较好的电化学性能。交流阻抗谱结果表明，掺杂后锂离子的电荷转移电阻和扩散阻力都大大降低，有利于锂离子在块体材料中的快速插层/脱插层。
A series of gallium-doped lithium trivanadates, LiV3−xGaxO8(x=0.00, 0.02, 0.04, 0.06, and 0.08), were prepared as cathode materials by a sol–gel method. The characterizations of the crystal structures and microstructures were investigated using X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM) mapping. Charge–discharge cycling performance, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were also used to characterize their electrochemical properties. The charge–discharge tests show that the electrochemical performance of LiV3O8improved with Ga3+doping and that LiV2.94Ga0.06O8has the best electrochemical properties, exhibits a high discharge capacity of 277(±3)mAhg−1and maintains a stable capacity of 226(±3)mAhg−1within 50 cycles at the charge–discharge rate of 0.1C and in the voltage range of 1.8–4.0V. The LiV2.94Ga0.06O8electrode also shows better electrochemical performances at higher rates. The EIS results show that both the charge-transfer resistance and the resistance of the lithium ion diffusion decreased greatly after doping, which is favorable for fast lithium-ion intercalations/deintercalations in bulk materials.
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影响因子：
6.6
作者：
Das, B.;Reddy, M. V.;Chowdari, B. V. R.
通讯作者：
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影响因子：
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影响因子：
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作者：
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