导电Ti3O5包覆纳米铝粉的制备及其作为双离子电池负极材料的电化学性能研究

Preparation of Nano-Al coated with the Conductive Ti3O5 shell and its Electrochemical Performance as Anode Materials of Dual-ion Batteries

摘要:

铝被认为是下一代电池最有前途的负极材料之一, 本文中采用导电的Ti₃O₅作为外壳包覆纳米铝粉来制备Al@Ti₃O₅核壳结构材料, 并将其作为负极材料应用到双离子电池(DIB)中。使用中间相炭微球(MCMB)作为正极材料,Al@Ti₃O₅作为负极材料制作Al@Ti₃O₅-MCMB双离子电池。电池的放电平台可达4.5V, 在电流倍率0.5C下(电流基于正极石墨的理论比容量计算,1C=372mAhg^_-1)放电比容量达到130.6mAhg^_-1,比能量密度为278.8Whkg^_-1。并且在高倍率5C下循环1000次过程中容量基本保持110mAhg^_-1不变,循环后容量保持率达到92.9%。

Abstract:

Aluminum is considered as one of the most promising anode materials for the next generation batteries, in this paper, we used conductive Ti₃O₅ shell coating nano-Al powder to prepare the core-shell structure material of Al@Ti₃O₅, and used it as an anode, accompanied by of MCMB as the cathode, to assemble the Al@Ti₃O₅-MCMB Dual-ion battery (DIB). The discharge platform of the Al@Ti₃O₅-MCMB DIB is up to 4.5V, and the discharge capacity can reach 130.6mAhg^_-1, specific energy density 278.8Whkg^_-1 at a current rate of 0.5C (the current rate is based on the theoretical specific capacity of graphite and 1C corresponding to 372 mAhg^_-1). The Al@Ti₃O₅-MCMB DIB shows excellent cyclic stability, and the capacity remains at around 110mAhg^_-1 in the process of circulating 1000 times under the current rate of 5C, with a capacity retention rate of 92.9% after circulation.