锂离子电池负极复合材料Al-Co3O4的合成及其电化学性能

采用流变相反应与热处理相结合的方法合成了锂离子电池用Al-Co3O4负极复合材料;利用充放电循环试验测定了复合材料的电化学性能;利用X射线衍射仪、扫描电镜及粒度分布仪分析了复合材料的微结构,考察了Co3O4含量、热处理温度及循环电压范围对复合材料电化学性能的影响;同时探讨了Co3O4纳米微粒在复合材料充放电过程中的作用机理.结果表明,在Al-Co3O4复合材料中,铝基体表面被Co3O4纳米颗粒所包覆;不同组成的复合材料电极的充放电循环性能均优于纯铝电极.

Synthesis and Electrochemical Performance of Al-Co3O4 Composites as Anodes of Lithium Ion Battery

Al-Co3O4 composites were synthesized as anode composites of lithium ion battery via a rheological phase reaction in combination with follow-up heat-treatment process. The electrochemical performance of the composites was evaluated by using charge-discharge cycle test, and their microstructures were analyzed by means of X-ray diffraction, scanning electron microscopy, and grit size analysis. The effects of Co3O4 content, heat-treatment temperature, and cycling potential range on the electrochemical performance of Al-Co3O4 composites were investigated. Moreover, the action mechanisms of Co3O4 nanoparticles in charge-discharge of the electrodes made of the composites were discussed. Results show that Al matrix is coated by Co3O4 nanoparticles in the composites, and the composites with varied compositions all have improved cycle performance than pure Al.