锂电池正极材料多硫化碳炔的制备及电化学性能  

Preparation and Electrochemical Performance of Carbyne Polysulfide as a Cathode Material for Lithium Batteries

作　　者：王维坤[1] 王安邦[1] 曹高萍[1] 杨裕生[1] 

机构地区：[1]防化研究院军用化学电源研究与发展中心,北京100083

出　　处：《应用化学》2005年第4期367-371,共5页Chinese Journal of Applied Chemistry

基　　金：国家"八六三"项目(2001AA320301)资助

摘　　要：为克服锂/硫电池的正极材料单质硫的导电性差、放电产物的部分溶解导致电池性能下降等问题,在“主链导电、侧链储能”思路下,设计并探索了一种新型正极材料多硫化碳炔。通过元素分析、13CNMR谱、Raman光谱及热分析测试技术对含碳炔结构的碳材料与单质硫在不同温度下的共热产物进行了表征。结果证明, 300℃下所得产物中多数硫以多硫链的形式化合在sp2杂化的碳主链上,生成接近理想多硫化碳炔的结构。该材料的放电容量高,大电流性能好(400mA/g的电流密度下放电比容量为773mA·h/g),循环性能较好(50次循环后,还具有350mA·h/g的容量),证明材料设计思路是可行的。The cathode material of lithium/sulfur rechargeable batteries, sulfur, exhibits poor conductivity, and its dischange product is partially soluble, leading to capacity decay during cycling. To mitigate these (problems), we proposed to design the cathode (material) with a conducting skeleton and energy-storing side chains, and prepared a novel material carbyne (polysulfide). The products obtained by co-heating carbon containing carbyne moieties and element (sulfur) were characterized by elemental analysis, ^(13)C NMR, Raman, and DSC/TG, and the product obtained at 300 ℃ was proved to have a sp^(2) hybride carbon skeleton with polysulfide attached on it, which resembles the theoretical structure of carbyne polysulfide. This material exhibits a high capacity of 773 mA·h/g at 400 mA/g and a stable reversible capacity of (350 mA·h/g) (after) 50 cycles. The good performance of this cathode material under swift discharge condition and its good cycling properties indicate the success of our new design principle.

关 键 词：正极材料 电化学性能 碳炔 硫化 锂电池 RAMAN光谱 制备 分析测试技术 sp^2杂化 放电比容量 电池性能 部分溶解 元素分析 ^13C NMR谱 放电容量 电流性能 电流密度 循环性能 设计思路 单质硫 导电性 产物 碳材料 近理想 

分 类 号：TQ330.67[化学工程—橡胶工业] TM912.2[电气工程—电力电子与电力传动]