Surface Coating and Electrochemical Properties of LiNi_0.8Co_0.15Al_0.05O₂ Cathode in Lithium-Ion Cells

Abstract:

LiNi_0.8Co_0.15Al_0.05O₂, as the cathode materials for lithium ion battery, were prepared from the precursors, Ni_0.8Co_0.15Al_0.05(OH)₂ which were synthesized by chemical co-precipitation method. LiNi_0.8Co_0.15Al_0.05O₂ particles are modified with AlF₃ and AlPO₄. Even though the initial discharge capacity of the coated LiNi_0.8Co_0.15Al_0.05O₂ was decreased that of the pristine material, the capacity retention and the thermal stability, in a highly oxidized state are both significantly improved. This effect is attributed to the thin coating layer protecting the oxidized cathode particles from being attacked by hydrogen fluoride in the electrolyte. The cycling behavior of the AlF₃-coated LiNi_0.8Co_0.15Al_0.05O₂ is quite stable showing good capacity retention (96.3% of its initial capacity after 30 cycles).

• Periodical: Advanced Materials Research (Volume 1058)
• Pages: 317-320
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1058.317
• Online since: November 2014
• Authors: Lin Zhang, Fei Luo, Jian Hua Wang, Yu Zhong Guo*
• Keywords: Cycleability, LiNi_0.8Co_0.15Al_0.05O₂, Lithium-Ion Battery, Surface Coating

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