硬碳的预锂化及其电化学性能  

Prelithiation of hard carbon and its electrochemical performance

作　　者：赵清江[1] 张贵锋 ZHAO Qingjiang;ZHANG Guifeng(Xinxiang Vocational and Technical College,Xinxiang 453006,Henan,China;Henan Lithium Power Co.Ltd.,Xinxiang 453006,Henan,China)

机构地区：[1]新乡职业技术学院,河南新乡453006 [2]河南锂动电源有限公司,河南新乡453006

出　　处：《储能科学与技术》2021年第6期2112-2116,共5页Energy Storage Science and Technology

摘　　要：以钛酸锂@活性炭复合材料作为正极,以商业化硬碳为负极同时将其与锂粉进行不同比例的复合,然后制备得到了预嵌锂硬碳//钛酸锂@活性炭锂离子电容器(LIC)。本工作通过对硬碳与锂粉进行不同比例的复合制备得到了多种预嵌锂硬碳极片,然后,通过对所制备得到的预嵌锂硬碳极片组装的LIC进行了一系列电化学性能测试,研究了硬碳极片的嵌锂量对LIC比能量和比功率的影响。结果表明:将硬碳与锂粉进行复合可以在不明显减小LIC比功率的同时,大幅提升LIC的比能量,其中当硬碳与锂粉的质量比为3∶1时所组装的LIC其能量密度最大可以达到29.69 W·h/kg,功率密度最大可以达到7.57 kW/kg,在电流密度为2 A/g时充放电循环2000次后容量保持率能够达到83.11%。The positive electrode was a lithium titanate@activated carbon composite material,and the negative electrode was commercial hard carbon.A series of steps were taken to prepare a lithium-ion capacitor(LIC)with pre-inserted lithium hard carbon/lithium titanate@activated carbon.Pre-intercalating hard carbon with various lithium contents resulted in a variety of pre-inserted lithium hard carbon pole pieces in this thesis.The LIC assembled with the prepared pre-inserted lithium hard carbon pole pieces was then electroporated in a series of steps.The chemical performance test investigated the effect of lithium insertion into the hard carbon pole piece on the specific energy and specific power of LIC.The results showed that doping lithium powder in hard carbon can significantly increase the specific energy of LIC while decreasing its specific power.The assembled LIC when the mass ratio of hard carbon to lithium powder was 3∶1 was one of them.After 2000 cycles of charge and discharge at a current density of 2 A/g,the energy density can reach 29.69 W·h/kg,the power density can reach 7.57 kW/kg,and the capacity retention rate can reach 83.11%.

关 键 词：预锂化 锂离子电容器 比功率 比能量 

分 类 号：TM911[电气工程—电力电子与电力传动] O611[理学—无机化学]