高能球磨法制备PTFE/科琴黑-C柔性复合材料及其电化学应用  

Preparation of PTFE/Ketjen Black-C flexible composites by high energy ball milling method and its electrochemical application

作　　者：闫崇 李向南[1,2,3] 曹朝霞[1,2,3] 田栓宝[1,2,3] 尹艳红[1,2,3] 杨书廷[1,2,3] 

机构地区：[1]河南师范大学化学化工学院,新乡453007 [2]动力电源及关键材料国家地方联合实验室,新乡453000 [3]河南省动力电源及关键材料协同创新中心,新乡453000

出　　处：《复合材料学报》2016年第10期2390-2396,共7页Acta Materiae Compositae Sinica

基　　金：河南省重点科技攻关项目(122102210234);河南省教育厅高校科技创新人才支持计划(14HASTIT004);河南省教育厅高等学校重点科研项目(15A150012)

摘　　要：对荷叶进行多阶温度炭化得到前驱炭材料,将材料与科琴黑(KB)、聚四氟乙烯(PTFE)按照2∶2∶3的质量比球磨混合后真空抽滤制备一种锂硫电池中间层柔性材料,PTFE/KB-C复合材料的多孔结构能为高阶硫化物Li_2Sn(4≤n≤8)的进一步还原提供较多的三相反应位点,并利用PTFE/KB-C复合材料良好的多层多孔化学吸附作用来抑制可溶性多硫化物的穿梭。该中间层在以纯硫材料为正极的锂硫电池电性能测试表征中,1.0C(电流密度1 675mA·g^(-1))倍率下首次放电比容量达1 350mAh·g^(-1),没有硝酸锂添加剂条件下经过100次充放电循环后比容量依旧保持在960mAh·g^(-1),库伦效率基本在95%以上,保持了良好的循环稳定性。A lithium-sulfur battery interlayer flexible material composed of precursor carbon material was prepared by multi-step temperature carbonization process with lotus-leaf as the raw material,ball-milling blending and vacuum filtrating precursor carbon material,Ketjen Black（KB）as well as polytetrafluo-roethylene（PTFE）at the mass ratio of 2∶2∶3.The porous structure of PTFE/KB-C composites can not only provide a large number of threephase reaction sites for further reduction of higher-order sulfide Li2Sn（4≤n≤8）,but also suppress the shuttle effect of soluble polysulphide by good multilayer porous chemical adsorption effect of PTFE/KB-C composites.The lithium-sulfur battery capacity property test characterization of interlayer with pure sulfur as the anode material shows that initial discharge specific capacity is as high as 1 350mAh·g^-1 at 1.0Crate（current density is 1 675mA·g^-1）and remains 960mAh·g^-1 after 100charge-discharge cycles without nitric acid lithium additives.Coulomb efficiency above 95%is achieved,demonstrating high performance of cycle stability.

关 键 词：锂硫电池 中间层 正极 穿梭效应 荷叶 

分 类 号：TB332[一般工业技术—材料科学与工程] TM912.9[电气工程—电力电子与电力传动]