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首页> 中文期刊> 《化学进展》 >微/纳复合结构硅基负极材料

微/纳复合结构硅基负极材料

         
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硅材料因其高的理论比容量(4200 mAh/g)而成为极具发展潜力的锂离子电池负极材料之一.纳米硅负极材料可有效避免材料在循环过程中的粉化现象,同时具有较短的Li+和电子传输路径,相应电极的电化学性能与微米硅电极相比显著提升,但是纳米结构硅材料比表面积过大、振实密度低等特点限制了其在实际生产中的应用.近年来,使用纳米结构硅材料作为一次结构单元构建微/纳复合结构硅基负极材料的策略被广泛研究.本文综述了微/纳复合结构硅基负极材料的研究进展,总结了微/纳复合结构硅基负极材料中一次颗粒和二次颗粒的选择与结构设计要素,并对具有代表性的微/纳复合结构硅基负极材料物理和电化学性能进行了介绍,提出优化的材料结构和电极设计方案.最后,对微/纳复合结构硅基负极材料存在问题进行简单分析并展望了其研究前景.%Due to high theoretical specific capacity (4200 mAh/g),silicon is considered as one of the most promising materials for lithium-ion battery negative electrodes.Nano-silicon negative materials can effectively avoid the pulverization of the particles during cycling and have shorter Li + and electron transport paths.The electrochemical performance of the corresponding electrodes is significantly improved compared to that of the micro-sized silicon based electrodes.However,the specific surface area of nano-materials is too large while the tap density is low,that limits the application of nano-silicon negative materials in practical production.In recent years,the strategy of using nano-structured silicon materials as building units to construct nano/micro structured silicon-based negative materials has been widely studied.The development of nano/micro structured silicon-based materials for lithium-ion batteries is reviewed.The selection and structural design elements of nano-sized primary particles as well as micro-sized secondary particles are summarized.The physical and electrochemical properties of representative nano/micro structured silicon-based materials are also introduced.Moreover,an optimized design of the nano/micro structured silicon-based material structure and electrode structure is proposed.Finally,challenges and problems existing in nano/micro structured silicon-based negative materials are briefly analyzed and prospects of them as negative materials for lithium-ion batteries are discussed.

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