锂一次电池正极材料CFx-Cu的高倍率性能研究  

CFx-Cu Composites with Excellent High Rate Performances as Cathode Materials for Lithium Primary Batteries

作　　者：张伶潇 张丽娟[1] 希利德格 亢婧 Zhang Lingxiao;Zhang Lijuan;Xili Dege Kang Jing(Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学,北京100124

出　　处：《稀有金属材料与工程》2020年第7期2256-2261,共6页Rare Metal Materials and Engineering

基　　金：Beijing Municipal High Level Innovative Team Building Program,Beijing University of Technology(IDHT20180504)。

摘　　要：采用一种简单新颖的原位化学改性方法制备了锂电池用CFx-Cu复合正极材料。采用XRD、SEM、EDS、TGA、EIS、CV和恒电流放电对正极材料的结构、形貌、反应机理和电化学性能进行了表征。Cu O与分布在CFx边缘或表面的非活性基团反应原位生成纳米铜,有效地提高了材料的电子导电性和锂离子扩散率,从而使改性材料显示出优异的比容量、倍率性能及功率密度。CFx-Cu复合材料在5 C的高倍率下,其放电比容量高达546 m Ah/g,最大功率密度为8393 W/kg,放电电压平台为2.0 V。CFx-Cu cathode materials for primary lithium battery were prepared by a simple and novel in-situ chemical modification method with high-temperature calcination process.The structure,morphology,reaction mechanism and electrochemical performance of cathode materials were characterized by X-ray powder diffraction,high-resolution transmission electron microscopy,scanning electron microscope,energy dispersive X-ray spectroscopic,thermo gravimetric analysis,cyclic voltammetry and galvanostatic discharge.It can be inferred that copper oxide reacts with inert groups on the surface of CFx to produce nano-copper particles,which increases the electronic conductivity and diffusion performance of lithium-ion in the CFx-Cu cathode materials.Therefore,the composite exhibits excellent specific capacity,rate performance and power density.Specifically,the CFx-Cu composites shows a high discharge specific capacity of 546 m Ah/g,and a maximum power density of 8393 W/kg,with a discharge voltage platform of 2.0 V at 5 C.

关 键 词：CFx-Cu正极材料 锂电池 高倍率性能 

分 类 号：TM912[电气工程—电力电子与电力传动] TB33[一般工业技术—材料科学与工程]