Tuning charge-discharge induced unit cell breathing in layer-structured cathode materials for lithium-ion batteries

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	Tuning charge-discharge induced unit cell breathing in layer-structured cathode materials for lithium-ion batteries
	Zhou, YN ; Ma, J ; Hu, EY ; Yu, XQ ; Gu, L ; Nam, KW ; Chen, LQ ; Wang, ZX ; Yang, XQ
刊名	NATURE COMMUNICATIONS
	2014
卷号	5
ISSN号	2041-1723
通讯作者	Wang, ZX (reprint author), Chinese Acad Sci, Inst Phys, Key Lab Renewable Energy, Beijing Key Lab New Energy Mat & Devices,Beijing, POB 603, Beijing 100190, Peoples R China.
中文摘要	For LiMO2 (M - Co, Ni, Mn) cathode materials, lattice parameters, a(b), contract during charge. Here we report such changes in opposite directions for lithium molybdenum trioxide (Li2MoO3). A 'unit cell breathing' mechanism is proposed based on crystal and electronic structural changes of transition metal oxides during charge-discharge. Metal-metal bonding is used to explain such 'abnormal' behaviour and a generalized hypothesis is developed. The expansion of the metal-metal bond becomes the controlling factor for a(b) evolution during charge, in contrast to the shrinking metal-oxygen bond as controlling factor in 'normal' materials. The cation mixing caused by migration of molybdenum ions at higher oxidation state provides the benefits of reducing the c expansion range in the early stage of charging and suppressing the structure collapse at high voltage charge. These results may open a new strategy for designing layered cathode materials for high energy density lithium-ion batteries.
资助信息	US Department of Energy, the Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Vehicle Technologies [DE-AC02-98CH10886]; National Natural Science Foundation of China [51372268]; National 973 Program of China [2015CB251100]; US Department of Energy, Basic Energy Science [DE-AC02-06CH11357]
语种	英语
公开日期	2015-04-14
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/59379]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Zhou, YN,Ma, J,Hu, EY,et al. Tuning charge-discharge induced unit cell breathing in layer-structured cathode materials for lithium-ion batteries[J]. NATURE COMMUNICATIONS,2014,5.
APA	Zhou, YN.,Ma, J.,Hu, EY.,Yu, XQ.,Gu, L.,...&Yang, XQ.(2014).Tuning charge-discharge induced unit cell breathing in layer-structured cathode materials for lithium-ion batteries.NATURE COMMUNICATIONS,5.
MLA	Zhou, YN,et al."Tuning charge-discharge induced unit cell breathing in layer-structured cathode materials for lithium-ion batteries".NATURE COMMUNICATIONS 5(2014).