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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 15    No. 6    December 2005

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Effect of ball milling and electrolyte on properties of high-voltage LiNi0.5Mn1.5O4 spinel
FANG Hai-sheng(方海升)1, WANG Zhi-xing(王志兴)1
YIN Zhou-lan(尹周澜)2, LI Xin-hai(李新海)1
GUO Hua-jun(郭华军)1, PENG Wen-jie

1.  School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China; 
2. School of Chemistry and Chemical Engineering, Central South University, 
Changsha 410083, China

Abstract: Effect of ball milling and electrolyte on the properties of high-voltage LiNi0.5Mn1.5O4 was investigated. Ball milling has significant effect on the synthesis and property of LiNi0.5Mn1.5O4. The X-ray diffraction(XRD) patterns indicate that LiNi0.5Mn1.5O4 can’t be synthesized without ball milling even calcined at 900℃. When synthesized with ball milling, LiNi0.5Mn1.5O4 almost exhibits only one plateau at around 4.7V. With the increase of ball milling time, the capacity of LiNi0.5Mn1.5O4 increases, but the cycling performance is not highly affected. The electrochemical property of LiNi0.5Mn1.5O4 highly depends on the electrolyte. The stable and high-voltage-resistant electrolyte is much beneficial to enhancement of electrochemical property of LiNi0.5Mn1.5O4, such as coulombic efficiency and cycling performance.

 

Key words:  LiNi0.5Mn1.5O4; cathode; lithium ion batteries; ball milling; electrolyte

ISSN 1672-7029
CN 43-1423/U

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