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Citation: TIAN Hua, YE Nai-Qing, PENG Yun-Ji. Synthesis of Spherical Cathode Material LiNi_0.95Al_0.05O₂ by Melt-salt Coating Method[J]. Chinese Journal of Applied Chemistry, ;2008, 25(12): 1430-1434. shu

Synthesis of Spherical Cathode Material LiNi_0.95Al_0.05O₂ by Melt-salt Coating Method

1.
Key Laboratory of New Processing Technology for Nonferrous Metals and Materials of Ministry of Education, Guilin 541004

Corresponding author: YE Nai-Qing,
Received Date: 17 November 2007
Available Online: 28 March 2008
Fund Project: 广西自然科学基金资助项目(0575100) (0575100)广西教育厅科研项目(0420022) (0420022)

A spherical cathode material LiNi_0.95Al_0.05O₂ was synthesized by melt-salt coating method in air using LiNO₃,Al(NO₃)₃·9H₂O and spherical Ni(OH)₂ as starting materials.The morphology,structure and performence of the resulted product were characterized.The effects of synthesizing temperature,time and excess Lithium on the structure and electrochemical property of the resulted products were systemically investigated.The experimental results show that the synthesized material LiNi_1-xAl_xO₂ has the α-NaFeO₂ type ordered layered structure,spherical morphology and good electrochemical performance.The optimized conditions to synthesize LiNi_0.95Al_0.05O₂ are to calcine at 750℃ for 16 h with 10% excess lithium in the starting materials.The sample prepared under such conditions has the highest initial discharge capacity of 176 mA·h/g,the smallest irreversible capacity loss of 22.5% and the discharge capacity of LiNi_0.95Al_0.05O₂ still retains at 167.1 mA·h/g and the capacity retention ratio is 94.9% after 30 cycles at a constant current density of 30 mA/g between 2.5 and 4.35 V versus Li at room temperature.
- lithium-ion battery,
- spherical cathode material,
- LiNi_0.95Al_0.05O₂,
- melt-salt coating method,
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Synthesis of Spherical Cathode Material LiNi_0.95Al_0.05O₂ by Melt-salt Coating Method