钠
镍
锰
阴极
离子
氧气
无机化学
材料科学
电压
化学工程
氧化物
化学
冶金
分析化学(期刊)
电气工程
物理化学
有机化学
工程类
色谱法
作者
Xinyin Cai,Yanan Xu,Lei Meng,Xijun Wei,Fangyu Xiong,Tengfei Xiong,Qinyou An
标识
DOI:10.1016/j.jallcom.2019.153093
摘要
P2-type NaxNi1/3Mn2/3O2 is considered as one of the promising cathodes for sodium-ion batteries due to its low cost, low toxicity and high operating voltage. However, this material suffers the serious capacity decay and poor stability during cycling. Here, we performed the in-situ X-ray diffraction measurement to investigate the relationship among the voltage window, crystal structure evolution and capacity decay. Based on the finding that the capacity decay is mainly caused by the formation of oxygen anion group [O2]x−(0<x<4), we controlled the voltage in 2.6–3.8 V to avoid the oxygen reaction and the capacity retention of the material has been improved from ∼14% (for 100 cycles) to 94.5% (for 500 cycles).
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