新型导电性CMC-Li粘结剂在锂空气电池上的应用研究（英文）

Carboxymethyl Cellulose Lithium(CMC-Li) as a Novel Binder and Its Application in Lithium-Air Batteries

以羧甲基纤维素钠(CMC)为原料经过酸化、中和两步法制备的羧甲基纤维素锂(CMC-Li),可作为一种新型的导电性粘结剂应用于锂空气电池的空气正极。对比了4种不同组分粘结剂(PTFE,CMC+PTFE,CMC-Li,CMC-Li+PTFE)对锂空气电池电化学性能的影响。结果表明,以8%CMC-Li+2%PTFE为粘结剂的电池表现出最佳的电化学性能。该电池在0.3mA/cm2电流密度下,深度放电首次比容量为10478mAh/g,能量效率高达81.76%,该电池在0.5mA/cm2可逆循环102次。CMC-Li+PTFE作为锂空气电池粘结剂,改善了电池的循环性能,提高了电池比能量。

A novel CMC-Li binder, with functional conductive characteristic, has been introduced in the present paper. When mixed with L-CNTs to make air cathodes, it could solve the peeling off of the active materials and its parasitic reaction into Li F for polyvinylidene fluoride(PVDF) and polytetrafluoroethylene(PTFE) in the lithium-air battery. Lithium-air batteries with various binders(PTFE, CMC+PTFE, CMC-Li, CMC-Li +PTFE) based L-CNTs cathodes were assembled to examine the electrochemical performance. It is found that the cells with 8% CMC-Li + 2% PTFE as binder exhibit the greatest enhancement of cycling stability and specific capacity. Specific capacity reaches to 10478 m Ah/g at the current density of 0.3 m A/cm2, the energy efficiency is up to 81.76% and the cells recharg to 102 cycles at the current density of 0.5 m A/cm2.