Study on Elevated-Temperature Performance of LiCo_0.02Cr_0.02Mn_1.96O₄ by Surface Modification

Abstract:

The elevated-temperature performance of LiCo_0.02Cr_0.02Mn_1.96O₄ cathode material, by SiO₂-Al₂O₃ surface modification, has been studied. The cathode material was been deal with SiO₂-Al₂O₃, and then heated on certain temperature to get rid of organic material. The material structures that been modified (unmodified) were characterized by XRD, SEM and SpectraPlus. X-ray diffraction shows that all the samples have perfect spinel structure. The cycle stability of charge & discharge has been improved at 55°C. The results of the charge/discharge curves shows that the modified cathode materials have better performance than those unmodified, according to the inhibition of decline of reversible capacity of spinel LiCo_0.02Cr_0.02Mn_1.96O₄.Therefore, cycle performance has improved so obviously that 87.92% of the initial capacity were preserved respectively after 100 cycles. As cathode material of Lithium-ion battery, the modified spinel material is one of the most competitive substitutes for LiCoO₂.

• Periodical: Advanced Materials Research (Volumes 415-417)
• Pages: 14-18
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.415-417.14
• Online since: December 2011
• Authors: Xing He Lu, Dong Han, Guang Qing Zhang, Nan Ma, Si Fei Liu
• Keywords: Cathode Material, Elevated-Temperature Performance, Lithium-Ion Battery, Spinel, Surface Modification

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