Improvement in the electrochemical performance of a LiNi0.5Mn0.5O2 cathode material at high voltage

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	Improvement in the electrochemical performance of a LiNi0.5Mn0.5O2 cathode material at high voltage
	Li, Faqiang1,3,4 ; Yang, Guowei 1,2,3; Jia, Guofeng1,3 ; Shangguan, Xuehui 1,2,3; Zhuge, Qin1,3 ; Bai, Bin 4
	2017-11-01
发表期刊	JOURNAL OF APPLIED ELECTROCHEMISTRY
卷号	47 期号:11 页码:1189-1201
文章类型	Article
摘要	Layered LiNi0.5-x Ca (x) Mn0.5O2 (0 <= x <= 0.2) cathode materials were prepared through a combination of co-precipitation and a solid-state method. The prepared cathode materials were investigated in detail by X-ray diffraction (XRD), Rietveld refinement, inductively coupled plasma, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), cyclic voltammetry and charge-discharge measurements. The results of XRD, Rietveld refinement, XPS and SEM measurements revealed that Ca-doping can increase the stability of the structure and lower the amount of Li/Ni cation mixing. Furthermore, Ca-doping was not observed to affect the morphology or oxidation states of the LiNi0.5Mn0.5O2. The electrochemical measurements showed that the pristine LiNi0.5Mn0.5O2 material has the lowest discharge capacity of 88.6 mAh g(-1) between 3 and 4.5 V at a constant density of 0.2 C, which was improved 38% by doping with 3 mol% of Ca. Additionally, the capacity retention of the 3 mol% Ca-doping is 20% higher than that of the pristine LiNi0.5Mn0.5O2 material in the voltage range of 3.0-4.5 V. Furthermore, we investigated the source of the enhancement of the electrochemical properties from Ca-doping. The improvement may be attributed to increased structural stability, lowered Li/Ni cation mixing, decreased polarization, reduced migration resistance and faster lithium-ion diffusion.
关键词	Ca-doping Lini0.5mn0.5o2 Cathode Material Lithium-ion Batteries Co-precipitation And Solid-state Method
WOS标题词	Science & Technology ; Physical Sciences
关键词[WOS]	LITHIUM-ION BATTERIES ; LAYERED LINI0.5MN0.5O2 ; PHYSICAL-PROPERTIES ; THIN-FILM ; TEMPERATURE ; SIMULATION ; MORPHOLOGY ; BEHAVIOR ; ROUTE ; CELLS
收录类别	SCI
语种	英语
WOS研究方向	Electrochemistry
WOS类目	Electrochemistry
WOS记录号	WOS:000412932300001
引用统计	被引频次：1[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/6263
专题	青海盐湖研究所知识仓储盐湖资源与化学实验室
作者单位	1.Chinese Acad Sci, Qinghai Inst Salt Lakes, Key Lab Comprehens & Highly Efficient Utilizat Sa, Xining 810008, Qinghai, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Key Lab Salt Lake Resources Chem Qinghai Prov, Xining 810008, Qinghai, Peoples R China 4.Qinghai Green Grass New Energy Technol Co Ltd, Qinghai Res Ctr Low Temp Lithium Battery Technol, Xining 810000, Qinghai, Peoples R China
推荐引用方式 GB/T 7714	Li, Faqiang,Yang, Guowei,Jia, Guofeng,et al. Improvement in the electrochemical performance of a LiNi0.5Mn0.5O2 cathode material at high voltage[J]. JOURNAL OF APPLIED ELECTROCHEMISTRY,2017,47(11):1189-1201.
APA	Li, Faqiang,Yang, Guowei,Jia, Guofeng,Shangguan, Xuehui,Zhuge, Qin,&Bai, Bin.(2017).Improvement in the electrochemical performance of a LiNi0.5Mn0.5O2 cathode material at high voltage.JOURNAL OF APPLIED ELECTROCHEMISTRY,47(11),1189-1201.
MLA	Li, Faqiang,et al."Improvement in the electrochemical performance of a LiNi0.5Mn0.5O2 cathode material at high voltage".JOURNAL OF APPLIED ELECTROCHEMISTRY 47.11(2017):1189-1201.