High power performance of nano-LiFePO4/C cathode material synthesized via lauric acid-assisted solid-state reaction

被引：70

作者：

Cheng, Fuquan ^{[1
]}

Wan, Wang ^{[1
]}

Tan, Zhuo ^{[1
,2
]}

Huang, Youyuan ^{[1
]}

Zhou, Henghui ^{[1
]}

Chen, Jitao ^{[1
]}

Zhang, Xinxiang ^{[1
]}

机构：

[1] Peking Univ, Coll Chem & Mol Engn, Beijing 100871, Peoples R China

[2] Xiangtan Univ, Coll Chem, Xiangtan 411105, Hunan, Peoples R China

来源：

ELECTROCHIMICA ACTA | 2011年 / 56卷 / 08期

基金：

国家高技术研究发展计划(863计划);

关键词：

Lithium-ion batteries; LiFePO4/C composite; Lauric acid; Solid-state reaction; LITHIUM IRON PHOSPHATE; LIFEPO4; NANOPARTICLES; BATTERIES; IMPACT;

D O I：

10.1016/j.electacta.2011.01.007

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

A nano-LiFePO4/C composite has been directly synthesized from micrometer-sized Li2CO3, NH4H2PO4, and FeC2O4.2H(2)O by the lauric acid-assisted solid-state reaction method. The SEM and TEM observations demonstrate that the synthesized nano-LiFePO4/C composite has well-dispersed particles with a size of about 100-200 nm and an in situ carbon layer with thickness of about 2 nm. The prepared nano-LiFePO4/C composite has superior rate capability, delivering a discharge capacity of 141.2 mAh g(-1) at 5 degrees C. 130.9 mAh g(-1) at 10 degrees C, 121.7 mAh g(-1) at 20 degrees C, and 112.4 mAh g(-1) at 30 degrees C. At 20 degrees C, this cathode material still exhibits good rate capability with a discharge capacity of 91.9 mAh g(-1) at 1 degrees C. The nanoLiFePO(4)/C composite also shows excellent cycling ability with good capacity retention, up to 100 cycles at a high current density of 30 degrees C. Furthermore, the effect of lauric acid in the preparation of nanoLiFePO(4)/C composite was investigated by comparing it with that of citric acid. The SEM images reveal that the morphology of the LiFePO4/C composite transformed from the porous structure to fine particles as the molar ratio of lauric acid/citric acid increased. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：2999 / 3005

页数：7

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