Electrochemical Properties of Li-Riched Li[Li0.2Co0.4Mn 0.4]O2 Cathode Material for Lithium Ion Batteries

Zhe Li; Kai Zhu; Yu Hui Wang; Gang Li; Gang Chen; Hong Chen; Ying Jin Wei; Chun Zhong Wang

doi:10.4028/www.scientific.net/AMR.347-353.3658

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Electrochemical Properties of Li-Riched Li[Li_0.2Co_0.4Mn _0.4]O₂ Cathode Material for Lithium Ion Batteries

Abstract:

The Li[Li0.2Co0.4Mn0.4]O2 cathode material was prepared by a sol-gel method. The X-ray diffraction (XRD) spectroscopic showed that the material was a solid solution of LiCoO2 and Li2MnO3. The material showed a reversible discharge capacity of 155.6 mAhg−1 in the voltage window of 2.0-4.3 V after percharge to 4.6 V. While the material cycled in the same voltage window without precharge could only deliver capacity of 77.6 mAhg−1. This high capacity was attributed to the loss of oxygen and structural rearrangement in the precharge process.