材料科学
阴极
氧化还原
磁滞
尖晶石
电压
工作(物理)
离子
降级(电信)
空位缺陷
化学工程
电气工程
化学
热力学
物理化学
结晶学
凝聚态物理
电子工程
有机化学
物理
冶金
工程类
作者
Qing Zhao,Mengke Zhang,Zhengcheng Ye,Yao Li,Lang Qiu,Zhuo Zheng,Yang Liu,Benhe Zhong,Yang Song,Xiaodong Guo
出处
期刊:Nanoscale
[The Royal Society of Chemistry]
日期:2023-01-01
卷期号:15 (7): 3326-3336
被引量:9
摘要
Li-rich layered materials have attracted much attention for their large capacity (>250 mA h g-1) stemming from anion redox at high voltage. However, inherent problems, such as capacity decay and voltage decay/hysteresis during cycling, hinder their commercial progress. In this work, an oxygen vacancy-accompanied spinel interface layer is constructed by gas-solid reaction via NiCO3 treatment at 650 °C, which reduces the asymmetry of anion redox and improves structural stability. Therefore, a 1 mol% NiCO3-modified sample powerfully reduces the voltage hysteresis (∼0.23 V) in the first cycle, simultaneously exhibiting an excellent discharge capacity of 275 mA h g-1 at 0.1 C with a capacity retention of 90% for 200 cycles at 1 C.
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