材料科学
电化学
降级(电信)
电解质
电极
阴极
介电谱
分析化学(期刊)
离子
电压
涂层
化学工程
复合材料
电子工程
化学
电气工程
有机化学
物理化学
色谱法
工程类
作者
Kunkanadu R. Prakasha,M. Sathish,Parthasarathi Bera,A. S. Prakash
出处
期刊:ACS omega
[American Chemical Society]
日期:2017-05-25
卷期号:2 (5): 2308-2316
被引量:41
标识
DOI:10.1021/acsomega.7b00381
摘要
In the quest to tackle the issue of surface degradation and voltage decay associated with Li-rich phases, Li-ion conductive Li2ZrO3 (LZO) is coated on Li1.2Ni0.13Mn0.54Co0.13O2 (LNMC) by a simple wet chemical process. The LZO phase coated on LNMC, with a thickness of about 10 nm, provides a structural integrity and facilitates the ion pathways throughout the charge–discharge process, which results in significant improvement of the electrochemical performances. The surface-modified cathode material exhibits a reversible capacity of 225 mA h g–1 (at C/5 rate) and retains 85% of the initial capacity after 100 cycles. Whereas, the uncoated pristine sample shows a capacity of 234 mA h g–1 and retains only 57% of the initial capacity under identical conditions. Electrochemical impedance spectroscopy reveals that the LZO coating plays a vital role in stabilizing the interface between the electrode and electrolyte during cycling; thus, it alleviates material degradation and voltage fading and ameliorates the electrochemical performance.
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