磷酸铁锂电极结构对其电化学性能的影响  

Effect of electrode structure on performance of LiFePO_(4) batteries

作　　者：陈笙元 杨续来 方靖 CHEN Shengyuan;YANG Xulai;FANG Jing(Anhui Province Lithium-ion Power and Energy Storage Battery Industry Common Technology Research Center,Hefei University,Hefei Anhui 230601,China;Beijing Institute of Technology Chongqing Innovation Center,Chongqing 401120,China;NETC Innovation Center,Hefei Anhui 230031,China)

机构地区：[1]合肥学院安徽省锂离子动力与储能电池产业共性技术研究中心,安徽合肥230601 [2]北京理工大学重庆创新中心,重庆401120 [3]国科能源技术创新中心(合肥)有限公司,安徽合肥230031

出　　处：《电源技术》2024年第7期1219-1225,共7页Chinese Journal of Power Sources

基　　金：安徽省科技重大专项(2021e03020001);安徽省重点研发计划(2023z04020004);安徽高校协同创新项目(GXXT-2021-025)。

摘　　要：锂离子电池电极微观结构对电极活性物质的电化学性能有着重要的影响。利用双层涂布技术实现了不同组成、不同孔隙结构的双层磷酸铁锂电极构筑,其中通过在远离集流体的电极涂层组分中添加碳酸氢铵,使得电极涂层从集流体到电极表面呈现出孔隙率逐渐增大的电极结构特征。结果表明,从集流体到电极表面呈现出孔隙率逐渐增大的双层结构厚电极(涂层厚度为77.3μm),常温1 C倍率下放电比容量达145.3 mAh/g,60次循环后容量保持率为97.2%,常温5 C倍率下仍具有40 mAh/g的放电比容量,而相同面密度下单层结构厚电极(涂层厚度为74.9μm)的5 C放电比容量为0。The microstructure of lithium-ion battery electrodes has an important impact on the electrochemical performance of electrode active substances.A double-layer coating technology was used to construct double-layer lithium iron phosphate electrodes with different compositions and pore structures.By adding ammonium bicarbonate to the electrode coating component far from the collector,the electrode coating exhibited a gradually increasing pore structure from the collector to the electrode surface.The results show that the discharge specific capacity of the double-layer electrode(77.3μm)reaches 145.3 mAh/g at a rate of 1 C in room temperature,and the capacity retention after 60 cycles is 97.2%.At a high rate of 5 C in room temperature,it still has a discharge specific capacity of 40 mAh/g,while the discharge specific capacity of the single-layer electrode(74.9μm)at the same surface density is 0.

关 键 词：锂离子电池 造孔剂 双层电极 

分 类 号：TM912[电气工程—电力电子与电力传动]