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	锂离子电池正极材料LiNi_(0.7)Co_(0.25)Al_(0.05)O_2的结构表征和电化学特性
	李新禄 ; 康飞宇 ; 郑永平 ; 施秀娟 ; 沈万慈 ; LI Xinlu ; KANG Feiyu ; ZHENG Yongping ; SHI Xiujuan ; SHEN Wanci
	2010-06-10 ; 2010-06-10
关键词	正极材料 锂离子电池 微观结构 电化学 cathode material lithium ion battery microstructure electrochemistry TM911
其他题名	MICROSTRUCTURE AND ELECTROCHEMICAL CHARACTERISTICS OF LiNi_(0.7)Co_(0.25)Al_(0.05)O_2 AS A CATHODE MATERIAL FOR LITHIUM ION BATTERIES
中文摘要	用固相法制备球形LiNi0.7Co0.25Al0.05O2粉体,并综合研究该粉体的微观结构和电化学特性。用X射线衍射和透射电子选区衍射分析LiNi0.7Co0.25Al0.05O2的晶体结构。结果表明:LiNi0.7Co0.25Al0.05O2为纯αNaFeO2型六方晶结构。用扫描电镜观察二次颗粒的形状为球形。从循环伏安扫描实验中发现:掺杂Al元素能够抑制LiNi0.7Co0.3O2在Li+插入脱出过程中的结构相变,提高材料的循环稳定性。在电压为3.0~4.3 V,充放电倍率为C/5的条件下,LiNi0.7Co0.25Al0.05O2首次放电容量达到161.5 mA.h/g,30次循环后放电容量为156.1 mA.h/g,放电容量损失率仅为3.3%。; Spherical LiNi_(0.7)Co_(0.25)Al_(0.05)O_2 particles were synthesized by the solid state method.The microstructure and electrochemical characteristics were extensively investigated.The phase structure of LiNi_(0.7)Co_(0.25)Al_(0.05)O_2 was identified by X-ray diffraction and transmission electron selected area diffraction.The results show that the crystals are pure hexagonal αNaFeO_2.Scanning electron microscope photographs show that the secondary particles are spherical.Aluminum substitution effectively suppressed phase transitions in the lithium ion intercalationabjection process by cyclic voltammetry experiment.The discharge capacity of LiNi_(0.7)Co_(0.25)Al_(0.05)O_2 is 161.5 mA·h/g in the first cycle and 156.1 mA·h/g in the 30th cycle,with only 3.3% capacity fading at a chargedischarge rate of C/5 in the potential range of 3.0—4.3 V.
语种	中文 ; 中文
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/61199]
专题	清华大学
推荐引用方式 GB/T 7714	李新禄,康飞宇,郑永平,等. 锂离子电池正极材料LiNi_(0.7)Co_(0.25)Al_(0.05)O_2的结构表征和电化学特性[J],2010, 2010.
APA	李新禄.,康飞宇.,郑永平.,施秀娟.,沈万慈.,...&SHEN Wanci.(2010).锂离子电池正极材料LiNi_(0.7)Co_(0.25)Al_(0.05)O_2的结构表征和电化学特性..
MLA	李新禄,et al."锂离子电池正极材料LiNi_(0.7)Co_(0.25)Al_(0.05)O_2的结构表征和电化学特性".(2010).

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