Citation: LI Dong-Lin, MA Shou-Long, LI Yan, XIE Rong, TIAN Miao, FAN Xiao-Yong, GOU Lei, SHI Yong-Xin, YONG Hong-Tuan-Hua, HAO Li-Min. EDTA Assisted Synthesis and Electrochemical Performance of Li2MnSiO4/C Nanocomposite as a Cathode Material for Lithium Ion Btteries[J]. Chinese Journal of Inorganic Chemistry, ;2014, 30(5): 1056-1062. doi: 10.11862/CJIC.2014.167
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Li2MnSiO4/C nanospheres were prepared by combining the sol-gel and solvothermal processing using ethylene diamine tetraacetic acid (EDTA) as a chelating agent. After calcined under Ar atmosphere at 700 ℃, the (Li, Mn, Si)precursor complexed by EDTAtransformed into Li2MnSiO4/C nanocomposite particles approximately 50 nm in diameter. The initial charge and discharge specific capacities of the sample are 223 and 140 mAh·g-1 at a current density of 33 mA·g-1 (0.1C), respectively, and fifth discharge specific capacity can be achieved 138 mAh·g-1. The discharge specific capacity still is stabilized at around 80 mAh·g-1 at a current density of 66 mA·g-1 (0.2C) after 20 cycles. These results indicate that EDTAcan prevent secondary crystalline phase of forming during calcinations. Such well-dispersed nano-powder exhibits improved cycleability for Li2MnSiO4 cathode.
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