Pre-conditioned Li-rich layered cathode material for Li-ion battery

被引：0

作者：

Han, Zenghui ^{[1
,2
]}

Zhang, Yanan ^{[1
]}

Song, Dandan ^{[1
]}

Zhan, Hui ^{[1
,3
,4
]}

Zhou, Yunhong ^{[1
]}

机构：

[1] Wuhan Univ, Coll Chem & Mol Sci, Wuhan 430072, Hubei, Peoples R China

[2] Yuxi Normal Univ, Coll Resources & Environm, Yuxi 653100, Yunnan, Peoples R China

[3] Wuhan Univ, Hubei Key Lab Electrochem Power Sources, Wuhan 430072, Hubei, Peoples R China

[4] Wuhan Univ, Engn Res Ctr Organosilicon Cpds & Mat, Minist Educ, Wuhan 430072, Hubei, Peoples R China

来源：

IONICS | 2018年 / 24卷 / 11期

关键词：

Li-rich layered material; Efficiency; Rate capability; Post-treatment; LITHIUM MANGANESE OXIDES; HIGH-CAPACITY; ELECTROCHEMICAL PROPERTIES; SURFACE MODIFICATION; RECHARGEABLE BATTERIES; ANOMALOUS CAPACITY; COMPOSITE CATHODES; VOLTAGE DECAY; PERFORMANCE; ELECTRODES;

D O I：

10.1007/s11581-018-2491-9

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Solid solution material Li1.2Ni0.16Co0.08Mn0.56O2 (0.5Li(2)MnO(3).0.5LiNi(0.4)Co(0.2)Mn(0.4)O(2)) is obtained through rheological phase method and further treated in ammonium persulfate solution. The post-treatment significantly decreases the charging capacity above 4.5V and enhances the columbic efficiency in the initial cycle. Along with the higher efficiency, the cycling stability and the rate capability both get improved. The improvement mechanism is investigated in terms of XRD, XPS, Raman spectrometry, and ICP-AES. The results confirm that (NH4)(2)S2O8 treatment leads to Li+ removal from Li2MnO3 component while the layered structure of the solid solution phase is well maintained. After being treated in 30% (NH4)(2)S2O8 solution, 95% columbic efficiency is observed on Li1.2Ni0.16Co0.08Mn0.56O2 in the first cycle and it also shows a near 200mAhg(-1) capacity at 4C current rate.

引用

页码：3357 / 3365

页数：9

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