一步法制备钛酸锂复合电极及其性能研究

Preparation and properties of lithium titanate composite electrode by one-step method

可充电锂离子电池(LIB)已广泛应用于便携式电子产品,电动汽车等领域。优化电池负极是提高电池性能、降低电池成本的重要研究方向之一。采用溶胶-凝胶法制备尖晶石结构的Li_(4)Ti_(5)O_(12)(LTO)负极材料。采用溴化锂(LiBr)和LTO通过溶液混合法制备Br改性的LTO复合电极,改性LTO复合电极在电极制备过程中一步完成。采用扫描电子显微镜和X射线衍射仪观测改性LTO复合电极的微观形貌和晶体结构。采用电池充放电测试仪和电化学工作站对改性LTO复合电极进行电化学测试。实验结果表明,改性LTO复合电极样品在0.1 C充放电时可达到208.7 mAh·g^(-1)的比容量,比原始LTO电极样品提高了30.9%。

Rechargeable lithium-ion batteries(LIBs)have been widely used in portable electronics,electric vehicles,etc.Optimizing battery anode is one of the important research directions to improve battery performance and reduce battery cost.The spinel-structured Li4 Ti5 O12(LTO)anode material was prepared by sol-gel method.Lithium bromide(LiBr)and LTO were used to prepare the Br-modified LTO composite electrode by solution mixing method,and the modified LTO composite electrode was completed in one step during the electrode preparation process.The microscopic morphology and crystal structure of the modified LTO composite electrode were observed by scanning electron microscope and X-ray diffractometer.Electrochemical tests were carried out on the modified LTO composite electrode using battery charge and discharge test instruments and electrochemical workstations.The experimental results show that the modified LTO composite electrode sample can reach a specific capacity of 208.7 mAh·g^(-1)at 0.1 C charge and discharge,which is 30.9%higher than that of the original LTO electrode sample.