Synthesis and characterization of Li2Fe0.97M0.03SiO4 (M = Zn2+, Cu2+, Ni2+) cathode materials for lithium ion batteries

被引：132

作者：

Deng, C. ^{[1
]}

Zhang, S. ^{[2
]}

Yang, S. Y. ^{[2
]}

Fu, B. L. ^{[2
]}

Ma, L. ^{[1
]}

机构：

[1] Harbin Normal Univ, Coll Chem & Chem Engn, Prov Key Lab Nanofunctionalized Mat & Excitated S, Harbin 150025, Heilongjiang, Peoples R China

[2] Harbin Engn Univ, Coll Mat Sci & Chem Engn, Harbin 150001, Heilongjiang, Peoples R China

来源：

JOURNAL OF POWER SOURCES | 2011年 / 196卷 / 01期

基金：

中国国家自然科学基金;

关键词：

Lithium iron orthosilicate; Lithium ion battery; Cation doping; Electrochemical reversibility; ELECTROCHEMICAL PERFORMANCE; POSITIVE-ELECTRODE; LI2FESIO4; LI; LI2MNSIO4; LIFEPO4/C; LI2MSIO4; LI2MNXFE1-XSIO4; LI3V2(PO4)(3); SUBSTITUTION;

D O I：

10.1016/j.jpowsour.2010.06.064

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：

Attempts to dope Zn2+, Cu2+ or Ni2+ are made for Li2FeSiO4. The effects of dopant on the physical and electrochemical characteristics of Li2FeSiO4 were investigated. Zn2+ successfully entered into the lattice of Li2FeSiO4 and induced the change of lattice parameters. Compared with the undoped Li2FeSiO4, Li2Fe0.97Zn0.03SiO4 has higher discharge capacity, better electrochemical reversibility and lower electrode polarization. The improved electrochemical performance of Li2Fe0.97Zn0.03SiO4 can be attributed to the improved structural stability and the enhanced lithium ion diffusivity brought about by Zn2+ doping. However, Ni2+ and Cu2+ cannot be doped into the lattice of Li2FeSiO4. Cu and NiO are formed as impurities in the Cu- and Ni-containing samples, respectively. Compared with the undoped Li2FeSiO4, the Cu- and Ni-containing samples have lower capacities and higher electrochemical polarization. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：386 / 392

页数：7

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