间硝基苯胺基取代的三聚磷腈复合硫正极材料性能研究  

Study on the Electrochemical Performance of M-nitroaniline Replaced Triphosphazene-sulfur as Cathode Materials in Lithium-sulfur Battery

作　　者：岳鑫[1] 

机构地区：[1]聊城大学东昌学院化学与生物系,山东聊城252000

出　　处：《广东化工》2013年第17期45-47,共3页Guangdong Chemical Industry

摘　　要：采用间硝基苯胺制备混合取代三聚磷腈复合硫正极材料MPS,并对其进行了热处理。MPS上没有发生锂离子在苯胺基上的嵌入和脱嵌反应,首次放电比容量为847.3 mAh/g,30次循环后比容量为199.1 mAh/g。MPS电化学性能与TPS相似,间硝基苯胺基对S-S键起一定保护催化作用,晶态硫含量增加,比容量相对TPS有提高,衰减速率稍变大。热处理后,断裂的磷腈基团和间硝基苯胺取代基在活性硫表面较厚的包覆,导致放电比容量有较大幅度降低,首次为320 mAh/g。但相比热处理前,比容量下降缓慢,第二次容量保持率为93.1%,平均容量衰减率为2.5%。M-nitroaniline was used to prepare double substituted sulfur-triphosphazenes composite （MPS） and its sintered material （HMPS）. The embedding and dcmtercalation reaction of lithium-ion upon anilino did not happen, the first discharge capacity of MPS was 847.3mAh/g, after 30 cycles the discharge capacity was 199. 1 mAh/g. Electrochemical performance of MPS was similar to TPS, M-nitroaniline played a certain protective and catalytic effect on S-S bond, the content of clemental sulfur increased, leading to the increased capacity, but decay rate was larger. After heat treatment, the active sulfur was coated with thick fracture phosphazene groups and M-nitroaniline, resulted in significantly failing discharge capacity and the first discharge capacity was 320mAh/g. Compared to MPS, the specific capacity decreased more slowly, capacity retention rate of the 2nd cycle was 93. 1%, average capacity decay rate was 2.5%.

关 键 词：锂硫电池 正极材料 三聚磷腈复合硫 间硝基苯胺 

分 类 号：TM912.9[电气工程—电力电子与电力传动]