首页|原位合成Si/(SiO+Ag)复合负极材料及其电化学性能

原位合成Si/(SiO+Ag)复合负极材料及其电化学性能

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将微米Si和纳米Ag2O进行机械球磨,通过原位固相反应合成了Si基复合材料[Si/(SiO+Ag)],以沥青为碳源采用高温煅烧法制备了碳包覆Si基复合材料[Si/(SiO+Ag)-C].采用XRD、XPS、SEM、TEM对复合材料进行了表征,测试了其电化学性能.结果表明,微米Si和纳米Ag2O在球磨破碎过程中原位形成SiO和Ag颗粒,并附着在基体Si上,两种复合材料都展现出良好的倍率性能,在低电流密度(0.12 A/g)下Si/(SiO+Ag)和Si/(SiO+Ag)-C循环 5次后分别表现出1422和1039 mA·h/g的可逆比容量,而在高电流密度(2.40 A/g)下仍能获得672和393 mA·h/g的可逆比容量;当电流密度再次恢复到0.12 A/g时,可逆比容量可恢复到1329 和961 mA·h/g,Si/(SiO+Ag)-C表现出更好的循环稳定性,经80 次循环后可逆比容量仍稳定在943 mA·h/g,其突出的倍率性能归因于微米Si的颗粒细化以及球磨过程中原位反应形成纳米Ag颗粒导电特性,而循环稳定性的提高与原位形成SiO和包覆碳构成的双相缓冲结构有关.
In-situ synthesis and electrochemical properties of Si/(SiO+Ag)composite anode
Silicon-based composite[Si/(SiO+Ag)]was synthesized by in situ solid phase reaction of micron-Si and nano Ag2O treated with mechanical ball milling.Carbon-coated si-based composite[Si/(SiO+Ag)-C]was then obtained by high-temperature calcination of[Si/(SiO+Ag)]using asphalt as carbon source.The composites were characterized by XRD,XPS,SEM and TEM,followed by evaluation on their electrochemical properties.The results showed that SiO and Ag particles were formed by micron-Si and nano Ag2O in situ during the ball milling process,and adhered to the matrix Si.Both of the two composites exhibited excellent rate performance,with reversible specific capacities of 1422 and 1039 mA·h/g at low current density(0.12 A/g)after 5 cycles,and of 672 and 393 mA·h/g at high current density(2.40 A/g),respectively.When the current density was restored to 0.12 A/g again,the reversible specific capacities were restored to 1329 and 961 mA·h/g.Si/(SiO+Ag)-C exhibited better cycle stability,with the reversible specific capacity still maintained above 943 mA·h/g after 80 cycles.This outstanding rate performance was attributed to the refinement of micron-Si particles and the electrical conductivity of nano-Ag particles formed in-situ,while the improvement in cycle stability was related to the dual-phase buffer structure of SiO and coated carbon formed in-situ.

lithium-ion batteriescompositesSi anodessolid state reactionmechanochemistryfunctional materials

王帅、唐梦、蔡振飞、曹瑞、马扬洲、宋广生

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安徽工业大学 材料科学与工程学院,安徽 马鞍山 243000

锂离子电池 复合材料 Si负极材料 固相反应 机械化学 功能材料

国家自然科学基金国家级外国专家引进计划安徽省教委自然科学研究项目安徽省教委自然科学研究项目先进金属材料绿色制造与表面技术重点实验室项目先进金属材料绿色制造与表面技术重点实验室项目

52207246G20190219004KJ2020A0263YJS20210336GFST2022ZR02GFST2021KF01

2024

10.13550/j.jxhg.20230357

精细化工
大连化工研究院设计院 中国化工学会精细化工专业委员会 辽宁省化工研究院

精细化工

CSTPCD北大核心
影响因子：0.557
ISSN：1003-5214
年,卷(期)：2024.41(1)
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