静电喷雾法制备Si/C复合微球及其在锂离子电池中的应用  

Preparation of Si/C Composite Microspheres by Electrostatic Spraying and Its Application in Lithium Ion Batteries

作　　者：曾丽[1] 奚红雪 刘新刚[1] 张楚虹[1] Li Zeng;Hongxue Xi;Xingang Liu;Chuhong Zhang(Polymer Research Institute,State Key Laboratory of Polymer Materials Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学高分子研究所高分子材料工程国家重点实验室,四川成都610065

出　　处：《高分子材料科学与工程》2020年第9期130-137,共8页Polymer Materials Science & Engineering

基　　金：国家自然科学基金面上项目(51673123);成都市产业集群协同创新项目(2017-XT00-0000A-GX)。

摘　　要：以硅纳米粒子、聚丙烯腈(PAN)和聚甲基丙烯酸甲酯(PMMA)为原料,采用静电喷雾技术,通过改变接收方式及接收浴组分,利用聚合物在不同溶剂中的溶解性差异制备了多种硅/碳复合电极材料,并将其应用于锂离子电池中。通过扫描电镜、透射电镜、X射线衍射、氮气吸/脱附测试、热重分析和电化学测试对样品的形貌、结构和电化学性能进行表征。结果显示,采用水浴或者混合溶剂浴(V(NMP)∶V(H2O)=1∶1)的接收方式能够得到球形结构均匀的复合微球,同时采用溶剂浴接收得到的复合微球电极具有更加丰富的介孔结构,有利于离子的扩散。将其作为锂离子电池负极,在电流密度为0.05 C时,循环200周之后,电极仍具有567 mA·h/g的可逆比容量,并表现出较好的循环稳定性和倍率性能。By leveraging the disparities of solubility in different solvents,various Si/C composite electrodes for lithium-ion(LIB)anodes were prepared via electrostatic spraying under different collection solvents and conditions using silicon nanoparticles(Si),polyacrylonitrile(PAN)and polymethyl methacrylate(PMMA)as raw material.The morphology,structure and electrochemical properties of the samples were characterized by scanning electron microscope(SEM),transmission electron microscope(TEM),X-ray diffraction(XRD),nitrogen adsorption/desorption,thermogravimetric analysis(TG)and the electrochemical test.The composite electrodes with a uniform spherical structure could be obtained using the water bath or mixed solvent bath(V(NMP)∶V(H2O)=1∶1).Meanwhile,rich mesoporous structures beneficial to ion diffusion could be realized from the composite electrode collected by mixed solvent bath.When applied as an anode for LIB,this electrode delivers a reversible specific capacity of 567 mA·h/g after 200 cycles at a current density of 0.05 C,showing good cycling stability and rate performance.

关 键 词：锂离子电池 硅/碳复合电极 静电喷雾 复合微球 

分 类 号：TM912[电气工程—电力电子与电力传动]