Modification of a LiFePO<sub>4</sub> cathode for lithium ion batteries by carbon coating and copper doping

GUAN Yi-biao; WU Feng; BAI Ying; WU Chuan

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GUAN Yi-biao, WU Feng, BAI Ying, WU Chuan. Modification of a LiFePO4 cathode for lithium ion batteries by carbon coating and copper doping. New Carbon Mater., 2009, 24(04): 359-363.

Citation:

GUAN Yi-biao, WU Feng, BAI Ying, WU Chuan. Modification of a LiFePO₄ cathode for lithium ion batteries by carbon coating and copper doping. New Carbon Mater., 2009, 24(04): 359-363.

GUAN Yi-biao, WU Feng, BAI Ying, WU Chuan. Modification of a LiFePO4 cathode for lithium ion batteries by carbon coating and copper doping. New Carbon Mater., 2009, 24(04): 359-363.

Citation:

GUAN Yi-biao, WU Feng, BAI Ying, WU Chuan. Modification of a LiFePO₄ cathode for lithium ion batteries by carbon coating and copper doping. New Carbon Mater., 2009, 24(04): 359-363.

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Modification of a LiFePO₄ cathode for lithium ion batteries by carbon coating and copper doping

1.
School of Chemical Engineering &|the Environment, Beijing Institute of Technology, Beijing 100081, China;
2.
National Development Center of High Technology Green Materials, Beijing 100081, China

Funds: State Key Development Program of Basic Research of China (2002CB211800, 2009CB220100).

More Information

Author Bio:
GUAN Yi-biao(1980-), male, Doctor, engaged in research of cathode materials for liion batteries.
Corresponding author: WU Feng, Professor. Tel: +86-10-68912508
Received Date: 2008-09-02
Accepted Date: 2009-12-29
Rev Recd Date: 2008-04-23
Publish Date: 2009-12-20

Abstract

Abstract

The effects of a carbon coating and copper doping on the electrochemical performance and tap density of a LiFePO₄ cathode for lithium ion batteries were investigated by XRD, SEM, charge/discharge cycle tests, rate tests and tap density tests. Results showed that the average discharge capacity of LiFePO₄/C and LiFe_0.95Cu_0.05PO₄were 147mAh/g and 131mAh/g respectively. The capacity fading rate of LiFe_0.95Cu_0.05PO₄was much larger than that of LiFePO₄/C in a high-rate discharging test. The electrochemical performance of LiFePO₄/C was better than that of LiFe_0.95Cu_0.05PO₄, but the tap density of the latter was 1.5 times as large as that of the former.