The influence of treatment in a sulfur environment on the electrochemical performance of LiFePO4 as a cathode material for lithium-ion batteries

被引:8
作者
Lang, Xiaoshi [1 ,2 ]
Dong, Chunxi [2 ]
Cai, Kedi [2 ]
Li, Lan [3 ]
Zhang, Qingguo [1 ,2 ]
Wu, Hao [4 ]
机构
[1] BoHai Univ, Coll New Energy, Jinzhou 121007, Peoples R China
[2] BoHai Univ, Liaoning Prov Res Ctr Engn Technol Super Capac, Jinzhou 121013, Peoples R China
[3] BoHai Univ, Ctr Expt Management, Jinzhou 121013, Peoples R China
[4] Jinzhou Petrochem Co Ltd, CNPC, Jinzhou 121001, Peoples R China
基金
中国国家自然科学基金;
关键词
Lithium-ion battery; LiFePO4; Treatment in a sulfur environment; Specific capacity; Cycle life; COMPOSITE CATHODES; ORGANIC FRAMEWORK; ANODE MATERIAL; GRAPHENE; NANOPARTICLES; DEPOSITION; ELECTRODE;
D O I
10.1016/j.jallcom.2017.12.325
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
LiFePO4 is considered as one of efficient cathode materials for lithium-ion batteries due to its high specific capacity, long cycle life, low cost and good safety. As a result, its electrochemical performance has been extensively researched. In this paper, commercial pure LiFePO4 is treated in a sulfur environment by sintering at 155 degrees C for 10 h, followed by sintering at 300 degrees C for 2 h. Through XRD tests, the chemical compositions are determined as LiFePO4 before and after treatment in a sulfur environment. Through SEM observation and Raman measurements, the LiFePO4 particles treated in the sulfur environment become more dispersed, and the samples appear to be polycrystalline. The electrochemical test results show that the specific capacities of the LiFePO4 treated in the sulfur environment at 1C, 2C and 5C discharge current rates can reach 146.73 mAh. g(-1), 120.73 mAh. g(-1) and 104.97 mAh. g(-1), respectively. In addition, with the increase in the current density, the discharge voltage platform shows no obvious decrease. Most importantly, the discharge specific capacities do not show a downward trend after 1100 charge and discharge cycles. (c) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码:536 / 541
页数:6
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