个人信息Personal Information
教授
博士生导师
硕士生导师
任职 : 精细化工国家重点实验室主任,教育部智能材料化工前沿科学中心执行主任,大连理工大学膜科学与技术研究开发中心主任
性别:女
毕业院校:中国科学院大连化物所
学位:博士
所在单位:化工学院
学科:化学工程. 膜科学与技术. 生物医学工程
联系方式:hgaohong@dlut.edu.cn
电子邮箱:hgaohong@dlut.edu.cn
Electrocatalytic polysulfide transformation for suppressing the shuttle effect of Li-S batteries
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论文类型:期刊论文
发表时间:2021-02-02
发表刊物:APPLIED SURFACE SCIENCE
卷号:528
ISSN号:0169-4332
关键字:Fe2O3 microspheres; Shuttle effect; Polysulfides; Lithium-sulfur batteries
摘要:We report a method based on 2,4-dihydroxybenzoic acid-formaldehyde (RF-COOH) microsphere hard templates to prepare core-shelled Fe2O3 microspheres, which were then added to graphene oxide to obtain hierarchical reduced graphene oxide, ultimately dropping Fe2O3 (Fe2O3@rGO) by Vitamin C reduction and freeze drying. When used as cathode materials for lithium-sulfur batteries, Fe2O3@rGO shows a high specific capacity of 400.5 mAh g(-1) at 2 C after 500 cycles. The prominent performance is due to the collaborative assembly of rGO, which provides stable structural support and favourable conductivity, and core-shelled Fe2O3 microspheres, which are certified to have a strong interaction with polysulfides. The loose and stable skeletons of highly electroconductive rGO can offer a conducive framework for rapid ion/electron transport. Meanwhile, the unique core-shelled structure of Fe2O3 with the ample void space can anchor polysulfides through the strong chemical adsorption and buffer the mechanical stresses caused by volume expansion during the charge and discharge processes. Moreover, Fe2O3 promotes the transformation of polysulfides to insoluble LiPSs during the discharging process, effectively alleviating the shuttling of the polysulfides.