Nonstoichiometry of Li-rich cathode material with improved cycling ability for lithium-ion batteries

被引:14
作者
Tai, Zige [1 ]
Li, Xinglong [3 ]
Zhu, Wei [1 ]
Shi, Ming [1 ]
Xin, Yanfei [1 ]
Guo, Shengwu [1 ]
Wu, Yifang [2 ]
Chen, Yuanzhen [1 ]
Liu, Yongning [1 ]
机构
[1] Xi An Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China
[2] Northwest Inst Nonferrous Met Res, Xian 710016, Peoples R China
[3] Nanjing Elect Devices Inst, Nanjing 210016, Peoples R China
基金
中国国家自然科学基金;
关键词
Lithium-ion batteries; Nonstoichiometric Li-rich materterial; Cathode; Voltage decay; ENHANCED ELECTROCHEMICAL PERFORMANCE; HIGH-CAPACITY; SURFACE MODIFICATION; LI2MNO3; COMPONENT; LAYERED COMPOSITE; SPINEL PHASE; MN; STABILITY; LI1.2MN0.54NI0.13CO0.13O2; ACTIVATION;
D O I
10.1016/j.jcis.2020.03.005
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
Lithium-rich layered oxides are considered as promising cathode materials for lithium-ion batteries due to its high capacity, but the rapid decay of capacity and operating voltage are great challenges to achieve its commercial application. In this work, the nonstoichiometry of Li-rich layered oxide Li1.2Mn0.6Ni0.2O2 was designed by directly declining the Mn amounts in the form of Li1.2MnxNi0.2O2 (x = 0.59, 0.57, 0.55). The non-stoichiometric sample Li1.2Mn0.55Ni0.2O2 exhibits a capacity of 170.73 mAh g(-1) at 0.5 degrees C, a little lower than 187.29 mAh g(-1) of Li1.2Mn0.6Ni0.2O2, however, better cycling stability of operating voltage and capacity is attained with the reduction ofMnamounts, compared to that of Li1.2Mn0.6Ni0.2O2. The capacity retention of Li1.2Mn0.55Ni0.2O2 is enhanced to 88.7% via 74.7% of Li1.2Mn0.6Ni0.2O2 after 100 cycles at 0.5 degrees C. The declining value of operating voltage for Li1.2Mn0.55Ni0.2O2 is 0.200 V as compared to 0.559 V for Li1.2Mn0.6Ni0.2O2. Xray photoelectron spectra (XPS) was employed to confirm the existence of Ni3+ in the nonstoichiometric samples, and the amounts of Ni3+ increase along the Mn contents decrease. The improvement of electrochemical properties for nonstoichiometric samples is attributed to the presence of Ni3+ due to Ni3+ can defer the transition of layered-to-spinel structure through decreasing the Li/Ni mixing. (C) 2020 Elsevier Inc. All rights reserved.
引用
收藏
页码:264 / 272
页数:9
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