Hydrothermal Synthesis and Properties of New Cathode Material Li0.86V0.8O2

Chem. J. Chinese Universities ›› 2009, Vol. 30 ›› Issue (8): 1492.

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Hydrothermal Synthesis and Properties of New Cathode Material Li_0.86V_0.8O₂

HU Fang¹, DU Fei² , CHEN Yan³, WEI Ying-Jin¹, MING Xing¹, CHEN Gang² , WANG Chun-Zhong^1*

1. College of Materials Science and Engineering,
2. College of Physics,
3. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, Changchun 130012, China

Received:2008-09-27 Online:2009-08-10 Published:2009-08-10
Contact: WANG Chun-Zhong. E-email: wcz@mail. jlu.edu.cn
Supported by:
国家自然科学基金(批准号: 50672031)、教育部长江学者和创新团队发展计划(批准号: IRT0625)和吉林省科技发展计划(批准号: 20060511)资助.

Abstract

Abstract:

The new cathode material Li_0.86V_0.8O₂ was synthesized by two-steps reaction. The material crystallizes in the layered rhombohedral structure with space group R3m. The mechanism of phase evolution was studied in different alkalinity under hydrothermal condition. It is found that the hydrothermal reaction does not work in low LiOH·H₂O concentration. The single phase material of Li_0.86V_0.8O₂ can only be obtained in the concentration of 2.5 mol/L. Through X-ray photoemission spectrum, the binding of 516.4 and 523.1 eV can be attributed to the V_2p3/2⁴⁺ and V_2p1/2⁴⁺, which confirm the quadrivalent state of V ion in Li_0.86V_0.8O₂. With a current density of 7.4 mA/g, the charge capacity of Li_0.86V_0.8O₂ is 163 mA·h/g in the first cycle, and the first discharge capacity of the materials is 113 mA·h/g. After 20th cycles, the discharge capacity is still 80 mA·h/g, which shows good electrochemicalstability.

Key words: Li-ion battery; Cathode material; Hydrothermal synthesis method; Li_0.86V_0.8O₂; X-ray photoemission spectrum

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HU Fang, DU Fei , CHEN Yan, WEI Ying-Jin, MING Xing, CHEN Gang, ....... Hydrothermal Synthesis and Properties of New Cathode Material Li_0.86V_0.8O₂[J]. Chem. J. Chinese Universities, 2009, 30(8): 1492.

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Hydrothermal Synthesis and Properties of New Cathode Material Li_0.86V_0.8O₂

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