Three-dimensionally ordered macroporous Li2FeSiO4/C composite as a high performance cathode for advanced lithium ion batteries

被引：22

作者：

Ding, Zhengping ^{[1
]}

Liu, Jiatu ^{[1
]}

Ji, Ran ^{[1
]}

Zeng, Xiaohui ^{[1
]}

Yang, Shuanglei ^{[1
]}

Pan, Anqiang ^{[2
]}

Ivey, Douglas G. ^{[3
]}

Wei, Weifeng ^{[1
]}

机构：

[1] Cent S Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China

[2] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China

[3] Univ Alberta, Dept Chem & Mat Engn, Edmonton, AB T6G 1H9, Canada

来源：

JOURNAL OF POWER SOURCES | 2016年 / 329卷

基金：

中国国家自然科学基金; 国家教育部博士点专项基金资助;

关键词：

Lithium iron silicate; Three-dimensionally ordered macroporous structure; Cathode materials; Lithium ion batteries; RECENT PROGRESS; LI2MSIO4; M; MN; FE; CAPACITY; NANOCOMPOSITE; MECHANISM; DESIGN; PHASE; NI;

D O I：

10.1016/j.jpowsour.2016.08.091

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：

Li2MSiO4 (M = Mn, Fe, Co, Ni, et al.) has received great attention because of the theoretical possibility to reversibly deintercalate two Li+ ions from the structure. However, the silicates still suffer from low electronic conductivity, sluggish lithium ion diffusion and structural instability upon deep cycling. In order to solve these problems, a "hard-soft" templating method has been developed to synthesize three dimensionally ordered macroporous (3DOM) Li2FeSiO4/C composites. The 3DOM Li2FeSiO4/C composites show a high reversible capacity (239 mAh g(-1)) with similar to 1.50 lithium ion insertion/extraction, a capacity retention of nearly 100% after 420 cycles and excellent rate capability. The enhanced electrochemical performance is ascribed to the interconnected carbon framework that improves the electronic conductivity and the 3DOM structure that offers short Li ion diffusion pathways and restrains volumetric changes. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：297 / 304

页数：8

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