CAJ | 학술논문

本文以醋酸锂和钛酸丁酯为原料,以冰醋酸为抑制剂,采用溶胶-凝胶法制备了晶态Li4 Ti5 O12负极材料。与自制的3种电解液和实验室常用的电解液分别组装成锂/钛酸锂半电池。采用恒流充放电测试、循环伏安法(CV)及交流阻抗法(EIS)对其电化学性能进行研究。研究结果发现：在以环状碳酸酯类(EC、PC)和线性碳酸酯类( MEC)为溶剂、以六氟磷酸锂( LiPF6)为电解质的电解液中添加双乙二酸硼酸锂( LiBOB),有利于提高半电池的性能,首次放电比电容达到了198mA． h． g-1,且放电比电容经多次充放电后衰减得较小。而在电解液中加入碳酸亚乙烯酯( VC),半电池的性能有所下降。 Li4 Ti5 O12对电解液表现出较明显的兼容性。
본문이작산리화태산정지위원료,이빙작산위억제제,채용용효-응효법제비료정태Li4 Ti5 O12부겁재료。여자제적3충전해액화실험실상용적전해액분별조장성리/태산리반전지。채용항류충방전측시、순배복안법(CV)급교류조항법(EIS)대기전화학성능진행연구。연구결과발현：재이배상탄산지류(EC、PC)화선성탄산지류( MEC)위용제、이륙불린산리( LiPF6)위전해질적전해액중첨가쌍을이산붕산리( LiBOB),유리우제고반전지적성능,수차방전비전용체도료198mA． h． g-1,차방전비전용경다차충방전후쇠감득교소。이재전해액중가입탄산아을희지( VC),반전지적성능유소하강。 Li4 Ti5 O12대전해액표현출교명현적겸용성。
Lithium acetate and butyl titanate were used as raw materials,glacial acetic acid as inhibitor,nanocrystalline Li4 Ti5 O12 for the anode material of lithium-ion battery was prepared by sol-gel technique. The Li4 Ti5 O12 , three pre-prepared electrolytes and a conventional electrolyte were used to assemble four half-cells Li/Li4 Ti5 O12 , respectively. In order to explore the compatibles of Li4 Ti5 O12 toward the electrolytes, we performed the characterizations of galvanostatic charge-discharge tests, cyclic voltammetry (CV)and electrochemical impedance spectroscopy(EIS)for those half-cells. The research results showed that the performances of half-cell Li/Li4 Ti5 O12 could been improved by adding lithium bis( oxalato) borate( LiBOB) to the electrolyte that consisted of LiPF6, cyclic carbonates(EC,PC),and linear carbonate(MEC). The first discharge specific capacity of the half-cell reached 198mA. h. g-1 with less decrease under 20-time cycles of charge-discharge. However,when a little ethylene carbonate was added to the over elec-trolyte,the performances of the half-cell exhibited reduction. So,Li4 Ti5 O12 showed an obvious dependency on electrolyte.