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

被引：16
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
收藏
页码：339 / 346
页数：8
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