Structural and Electrochemical Characterization of (NH4)(2)HPO4-Treated   Lithium-Rich Layered Li1.2Ni0.2Mn0.6O2 Cathodes for Lithium-Ion   Batteries

doi:10.1149/2.023310jes

CORC > 北京大学 > 化学与分子工程学院

	Structural and Electrochemical Characterization of (NH4)(2)HPO4-Treated Lithium-Rich Layered Li1.2Ni0.2Mn0.6O2 Cathodes for Lithium-Ion Batteries
	Cheng, Fuquan ; Chen, Jitao ; Zhou, Henghui ; Manthiram, Arumugam
刊名	journal of the electrochemical society
	2013
关键词	MANGANESE OXIDES HIGH-VOLTAGE CO ELECTRODES PERFORMANCE CAPACITY MN NI LI2FESIO4 BEHAVIOR LI2MNO3
DOI	10.1149/2.023310jes
英文摘要	The effect of treating the lithium-rich layered Li1.2Ni0.2Mn0.6O2 with (NH4)(2)HPO4 solution followed by annealing at 400 - 700 degrees C on the structure and electrochemical properties has been investigated. It is found that the treatment with (NH4)(2)HPO4 solution (pH = 8.0) leach out lithium ions from layered Li1.2Ni0.2Mn0.6O2 through Li+/H+ ion-exchange process, which becomes enhanced at elevated temperatures (60 degrees C). Annealing the 60 degrees C (NH4)(2)HPO4 treated sample causes a lithium-deficiency-driven transformation to a 4.7 V LixNi0.5Mn1.5O4 spinel phase, while the sample treated with (NH4)(2)HPO4 at room temperature remains unaltered after such high-temperature annealing. Cathodes containing these annealed samples were prepared and evaluated in half cells by galvanostatic cycling. It is found out that the formed spinel-like phase become stable as the annealing temperature increases, whereas the layered phase in the annealed samples undergoes an irreversible transformation to a new 3 V spinel-like phase. Due to the excellent stability of both the 4.7 V LixNi0.5Mn1.5O4 spinel phase and the newly evolved 3 V spinal-like phase, the 600 and 700 degrees C annealed samples exhibit enhanced energy density, reaching more than 800 mWh g(-1) with good cycle life between 2.0 and 5.0 V. (C) 2013 The Electrochemical Society. All rights reserved.; Electrochemistry; Materials Science, Coatings & Films; SCI(E); EI; 5; ARTICLE; 10; A1661-A1667; 160
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/313064]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	Cheng, Fuquan,Chen, Jitao,Zhou, Henghui,et al. Structural and Electrochemical Characterization of (NH4)(2)HPO4-Treated Lithium-Rich Layered Li1.2Ni0.2Mn0.6O2 Cathodes for Lithium-Ion Batteries[J]. journal of the electrochemical society,2013.
APA	Cheng, Fuquan,Chen, Jitao,Zhou, Henghui,&Manthiram, Arumugam.(2013).Structural and Electrochemical Characterization of (NH4)(2)HPO4-Treated Lithium-Rich Layered Li1.2Ni0.2Mn0.6O2 Cathodes for Lithium-Ion Batteries.journal of the electrochemical society.
MLA	Cheng, Fuquan,et al."Structural and Electrochemical Characterization of (NH4)(2)HPO4-Treated Lithium-Rich Layered Li1.2Ni0.2Mn0.6O2 Cathodes for Lithium-Ion Batteries".journal of the electrochemical society (2013).