Nanocomposites LiMxFe1-xPO4/C synthesized via freeze drying assisted sol-gel routine and their magnetic and electrochemical properties

被引：20

作者：

Liu, Liying ^{[1
]}

Cao, Zujie ^{[1
]}

Cui, Yanyan ^{[1
]}

Ke, Xi ^{[1
]}

Zeng, Guoxun ^{[1
]}

Liu, Jun ^{[1
]}

Liu, Dan ^{[2
]}

Li, Qinghai ^{[2
]}

Lai, Jian ^{[2
]}

Shi, Zhicong ^{[1
]}

Chou, Shulei ^{[3
]}

机构：

[1] Guangdong Univ Technol, Smart Energy Res Ctr, Sch Mat & Energy, Guangdong Prov Key Lab Funct Soft Condensed Matte, Guangzhou, Guangdong, Peoples R China

[2] Dynavolt Renewable Energy Technol Co Ltd, Shenzhen, Peoples R China

[3] Univ Wollongong, Australian Inst Innovat Mat, Inst Superconducting & Elect Mat, Wollongong, NSW, Australia

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2019年 / 779卷

基金：

中国国家自然科学基金;

关键词：

Lithium ion battery; Cathode material; Lithium manganese phosphate; Iron substituting; Magnetic property; POSITIVE-ELECTRODE MATERIALS; CATHODE MATERIALS; SOLVOTHERMAL SYNTHESIS; CONTROLLABLE SYNTHESIS; ION; PERFORMANCE; LIFEPO4; FE; NANOSTRUCTURES; OLIVINES;

D O I：

10.1016/j.jallcom.2018.11.174

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：

Nanocomposites LiMnxFe1-xPO4/C (x = 1, 5/6, 2/3,1/2) are synthesized by a sol-gel route combined with freeze drying. Fe2+ substituted samples coated by high-ordered carbon have the same olivine structure of LiMnPO4/C but reduced cell volumes. Fe2+ substituting greatly influences magnetic characteristics of LiMnPO4/C and slight amounts of Fe2P impurity in Fe2+ doped samples are verified by magnetic tests. Fe2+ substituted samples exhibit much better electrochemical properties. Among them, LiMn1/2Fe1/2PO4/C displays the best rate capacity and cyclic stability. Its initial discharge capacity reaches 140.1 mAh g(-1) and remains at 132.5 mAh g(-1) after 100 cycles at 2C, remarkably higher than those of LiMnPO4/C. The superior electrochemical performances are mainly attributed to small charge-transfer impedance, fast Li+ diffusion, residual carbon and existence of Fe2P with excellent electronic conductivity. (C) 2018 Elsevier B.V. All rights reserved.

引用

页码：339 / 346

页数：8

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