电池2024，Vol.54Issue(6)：836-840,5.DOI:10.19535/j.1001-1579.2024.06.015
电池型电容器的正极结构设计与性能
Structure design and performance of cathode for battery-type capacitor
摘要
Abstract
When the cathode material of battery-type capacitors is coated and dried,the surface tension will lead to the instability of the electrode interface,the large resistivity of the pole piece and the uneven distribution of porosity.High-voltage lithium cobalt oxide(LiCoO2)is used as the cathode material,the thickness gradient design of the LiCoO2 cathode plate is carried out by using multi-layer coating technology.By controlling the total thickness of the double-layer coated electrode plates to 30 μm,the thickness gradient distribution between the double-layer electrode plates is adjusted,the differential distribution of porosity between the upper and lower layers of the electrode plates is realized,the rapid transmission channel of Li+is constructed to reduce ion diffusion resistance and slow capacity attenuation.A pouch battery-type capacitor is assembled with a hard carbon(HC)anode with anisotropy and high space,its electrochemical performance is tested.The Coulombic efficiency in the initial cycle of the two-layer electrodes LH-18(the thickness of the first layer is 18 μm)reaches 80.85%,which is 6.27 percentage points higher than the single-layer electrode(LH-30).When cycled in 2.5-4.2 V,the discharge capacity at 20.00 C is 81.82%of that at 1.00 C.After 3 509 cycles of 100%depth of discharge(DOD)at 1.00 C,the capacity retention rate is still 80%,the cycle number is 2.27 times than that of the single-layer electrode(LH-30).关键词
电池型电容器/钴酸锂(LiCoO2)/硬碳/多层涂覆Key words
battery-type capacitor/lithium cobalt oxide(LiCoO2)/hard carbon/multi-layer coating分类
信息技术与安全科学引用本文复制引用
田洪松,刘富亮,周雄,袁东,石斌,袁再芳..电池型电容器的正极结构设计与性能[J].电池,2024,54(6):836-840,5.基金项目
贵州省科技厅中央引导地方科技发展资金项目(黔科合中引地[2024]008) （黔科合中引地[2024]008）
