Impact of Initial Li Content on Kinetics and Stabilities of Layered Li1+x(Ni0.33Mn0.33Co0.33)1-xO2

被引：21

作者：

Chen, Guoying ^{[1
]}

Hai, Bin ^{[1
]}

Shukla, Alpesh K. ^{[1
]}

Duncan, Hugues ^{[1
]}

机构：

[1] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Environm Energy Technol Div, Berkeley, CA 94720 USA

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2012年 / 159卷 / 09期

关键词：

LITHIUM-ION BATTERIES; SOLID-STATE CHEMISTRY; MOLTEN-SALT SYNTHESIS; CATHODE MATERIAL; ELECTROCHEMICAL PROPERTIES; ELECTRODES; LICO1/3NI1/3MN1/3O2; SPECTROSCOPY; OXIDES; NMR;

D O I：

10.1149/2.038209jes

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Structure, morphology, and performance of Li1+x(Ni0.33Mn0.33Co0.33)(1-x)O-2 cathode materials with stoichiometric (x=0) and excess Li (x=0.14) were compared on micron-sized, well-formed single crystals. The additional Li in the fresh overlithiated oxide facilitated the formation of a superstructure with root 3a(hex) x root 3a(hex) x c(hex) unit cells, decreased the cell volume change, and improved the initial O3 phase stability upon lithium extraction. Slower kinetics were observed at low Li content where oxide activation dominated, a process that induced significant structure rearrangements and particle damages. For the first time, morphological evaluation during delithiation was well captured on the micron-sized single crystals. An irreversible activation plateau at 4.4 V was only observed during the first charge of the overlithiated crystals. The oxide's higher discharge capacity and better cycling stability between 2.5 and 4.8 V were attributed to its enhanced O3 phase stability upon deep Li extraction. (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.038209jes] All rights reserved.

引用

页码：A1543 / A1550

页数：8

共 30 条

[1] 6Li NMR studies of cation disorder and transition metal ordering in Li[Ni1/3Mn1/3Co1/3]O2 using ultrafast magic angle spinning [J].