涂层
电极
材料科学
电解质
阴极
复合数
电池(电)
高压
氧化物
电压
锂钴氧化物
锂(药物)
导电体
复合材料
锂离子电池
光电子学
化学工程
电气工程
化学
冶金
功率(物理)
物理化学
内分泌学
工程类
物理
医学
量子力学
作者
Aijun Zhou,Yanting Lu,Qingji Wang,Jin Xu,Weihang Wang,Xinyi Dai,Jingze Li
标识
DOI:10.1016/j.jpowsour.2017.02.035
摘要
Surface coating is a key strategy in lithium-ion battery technologies to achieve a high and stable battery performance. Increasing the operation voltage is a direct way to increase the energy density of the battery. In this work, TiO2 is directly sputtered on as-fabricated LiCoO2 composite electrodes, enabling a controllable oxide coating on the topmost of the electrode. With an optimum coating, the discharge capacity is able to reach 160 mAh g−1 (86.5% retention) after 100 cycles within 3.0–4.5 V at 1 C, which is increased by 40% compared to that of the bare electrode. The high-voltage rate capability of LiCoO2 is also remarkably enhanced after TiO2-coating as reflected by the much larger capacity at 10 C (109 vs. 74 mAh g−1). The artificially introduced oxide coating is believed to make the LiCoO2 electrode more resistant to interfacial side reactions at high voltage and thus minimizes the irreversible loss of the active material upon long cycling. The TiO2 coating layer is also possible to partially react with the decomposition product of electrolyte (e.g. HF) and form a more stable and conductive interphase containing TiFx, which is responsible for the improvement of the rate capability.
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