炭黑对锂空气电池气体扩散电极性能的影响

摘要

Effects of 3 kinds of carbon black, such as BP2000,XC-72 and acetylene black on electrochemical performance of gas diffusion electrodes for lithium-air battery were studied. The discharge performance of lithium-air battery was tested, acetylene black was determined to be superior to others for electrode. Acetylene black content and load were optimized and it delivered a specific capacity of 2 531 mAh/g at 0.2 mA/cm2 by discharging to 2.0 V when the content and load reached to 80% and 1.0 mg in electrode.SEM test result showed that the battery failure was mainly due to the accumulation of reaction products in electrode.%研究了BP2000、XC-72及乙炔黑等3种炭黑对锂空气电池气体扩散电极的电化学性能影响,测试了锂空气电池的放电性能,确定了电极用的最佳炭黑为乙炔黑.对电极上乙炔黑的含量及载量进行优化,当乙炔黑含量为80％、载量为1.0 mg时,以0.2 mA/cm2的电流放电至2.0V,炭黑的比容量可达2 531 mAh/g.SEM测试结果表明:反应产物在电极上的堆积是电池失效的主要原因.