The utility model discloses a porous silicon copper plating electrode for lithium ion batteries. The porous silicon copper plating electrode is cylindrical and consists of copper plated porous silicon particles; the copper plated porous silicon particles are composed of a shell and an inner core; the outer shell is copper particles, and has a porous nano structure, and the inner core is porous silicon. The preparation method includes the following steps: (1) pretreatment of polysilicon powder; (2) depositing nano Ag particles; (3) preparation of porous silicon; (4) preparation of shell; (5) formation of electrode; () preparation of porous silicon; (2) preparation of porous silicon; (2) preparation of porous silicon; (2) preparation of electrode; (2) formation of electrode. The utility model has the advantages of porous silicon copper electrode, copper particles and organic silicon close together, increase the contact area, effectively reduce the contact resistance, greatly increased the conductivity of copper particles; maximum limit the volume of silicon in the lithium in the process of expansion, can effectively prevent the silicon in the battery the charging and discharging process from the surface of the current collector separated and lithium ion battery failure, so as to improve the life cycle and stability of lithium ion battery.
【技术实现步骤摘要】
一种用于锂离子电池的多孔硅镀铜电极
本技术涉及锂离子电池
,具体涉及一种用于锂离子电池的多孔硅镀铜电极。
技术介绍
锂离子电池属于绿色高能可充电化学电源,具有电压高、能量密度大、循环性能好、自放电小、无记忆效应等突出优点,在运载工具、便携式电子设备、通信用后备电源、空间技术、国防工业等领域得到了广泛应用。目前,在商业化的锂离子电池体系中,一般采用石墨类碳作为负极材料,但是石墨的理论容量仅有372mAh/g,且倍率性能不佳,开发新型的高容量负极材料成为研究热点。硅的理论比容量高达4200mAh/g,比石墨类负极材料的比容量高一个数量级,并且其嵌/脱锂电位适中,与电解液反应活性低,在地壳中储量丰富,价格低廉,是新一代锂离子电池负极材料的理想选择。但是,硅与锂的合金化反应过程中,硅材料会产生剧烈的体积膨胀(>400%),容易导致活性材料在循环过程中发生急剧粉化以致从铜集流体脱落,硅与铜电接触减弱,使得电池循环寿命急速衰减。同时,由于硅材料的体积膨胀效应,使得硅材料在电解液中无法产生牢固的表面固体电解质膜,电极结构被破坏,新暴露出的硅表面会不断形成新的电子绝缘 ...
【技术保护点】
一种用于锂离子电池的多孔硅镀铜电极,其特征在于,所述多孔硅镀铜电极由镀铜多孔硅颗粒构成;所述镀铜硅颗粒由外壳和内芯构成;所述外壳由铜颗粒构成。
【技术特征摘要】
1.一种用于锂离子电池的多孔硅镀铜电极,其特征在于,所述多孔硅镀铜电极由镀铜多孔硅颗粒构成;所述镀铜硅颗粒由外壳和内芯构成;所述外壳由铜颗粒构成。2.根据权利要求1所述的一种用于锂离子电池的多孔硅镀铜电极,其特征在于,所述外壳...
【专利技术属性】
技术研发人员:袁伟,潘保有,邱志强,罗健,黄诗敏,闫志国,谭振豪,汤勇,
申请(专利权)人:华南理工大学,
类型:新型
国别省市:广东,44
还没有人留言评论。发表了对其他浏览者有用的留言会获得科技券。