High-Performance Carbon-LiMnPO4 Nanocomposite Cathode for Lithium Batteries

被引：321

作者：

Oh, Seung-Min ^{[1
]}

Oh, Sung-Woo ^{[1
]}

Yoon, Chong-Seung ^{[2
]}

Scrosati, Bruno ^{[3
]}

Amine, Khalil ^{[4
]}

Sun, Yang-Kook ^{[1
]}

机构：

[1] Hanyang Univ, Dept Chem Engn, Dept WCU Energy Engn, Seoul 133791, South Korea

[2] Hanyang Univ, Dept Mat Sci & Engn, Seoul 133791, South Korea

[3] Univ Roma La Sapienza, Dept Chem, I-00185 Rome, Italy

[4] Argonne Natl Lab, Electrochem Technol Program, Chem Sci & Engn Div, Argonne, IL 60439 USA

来源：

ADVANCED FUNCTIONAL MATERIALS | 2010年 / 20卷 / 19期

关键词：

ELECTRODE MATERIALS; PARTICLE-SIZE; LIMNPO4; LIFEPO4; TEMPERATURE; TRIPHYLITE; DISCHARGE; PHOSPHATE; MN; FE;

D O I：

10.1002/adfm.201000469

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A cathode material of an electrically conducting carbon-LiMnPO4 nanocomposite is synthesized by ultrasonic spray pyrolysis followed by ball milling. The effect of the carbon content on the physicochemical and electrochemical properties of this material is extensively studied. A LiMnPO4 electrode with 30 wt% acetylene black (AB) carbon exhibits an excellent rate capability and good cycle life in cell tests at 55 and 25 degrees C. This electrode delivers a discharge capacity of 158 mAh g(-1) at 1/20 C, 126 mAh g(-1) at 1 C, and 107 mAh g(-1) at 2 C rate, which are the highest capacities reported so far for this type of electrode. Transmission electron microscopy and Mn dissolution results confirm that the carbon particles surrounding the LiMnPO4 protect the electrode from H F attack, and thus lead to a reduction of the Mn dissolution that usually occurs with this electrode. The improved electrochemical properties of the C-LiMnPO4 electrode are also verified by electrochemical impedance spectroscopy.

引用

页码：3260 / 3265

页数：6

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