柔性 TiO₂-TiSe₂/纳米碳纤维膜提升锂/硫电池倍率性能

Flexible TiO₂-TiSe₂/Carbon Nanofiber Membrane Towards Enhancing the Rate Performance of Li/S Batteries

摘要

锂硫电池因具有理论能量密度高和正极活性物质资源丰富等优势而备受关注. 然而, 严重的多硫化锂穿梭效应和缓慢的电化学转换动力学严重阻碍了高能量密度、 高倍率性能锂硫电池的发展. 为解决上述问题, 本文制备了柔性导电TiO₂-TiSe₂/纳米碳纤维膜(TiO₂-TiSe₂/CNF), 将其置于锂硫电池正极侧与隔膜之间作为膜反应器来调控锂硫转换. 实验结果表明, TiO₂-TiSe₂活性位对多硫化锂的强吸附作用能有效抑制穿梭效应, 纳米碳纤维网络加速了离子和电子的传输, 增强了反应动力学. TiO₂-TiSe₂/CNF膜反应器调制锂硫电池在0.1C倍率下的初始放电比容量达1305.7 mA∙h/g, 在5C倍率下放电比容量达684.7 mA∙h/g, 在1C倍率下循环200次后放电比容量保持在795.4 mA∙h/g.

Abstract

Lithium-sulfur batteries have attracted much attention due to their advantages such as high theoretical energy density and abundant cathode active material resources. Howfever, the severe lithium polysulfide shuttle effect and slow electrochemical conversion kinetics have seriously hindered the development of high energy density and high multiplicity performance lithium-sulfur batteries. To solve the above problems, a flexible conductive TiO₂-TiSe₂/carbon nanofibre membrane (TiO₂-TiSe₂/CNF) was prepared and placed between the anode side and the diaphragm of lithium-sulfur batteries as a membrane reactor to regulate the lithium-sulfur conversion. The results showed that the strong adsorption of lithium polysulfide on the TiO₂-TiSe₂ active sites effectively suppressed the shuttle effect, and the carbon nanofibre network accelerated the transport of ions and electrons to enhance the reaction kinetics. The TiO₂-TiSe₂/CNF membrane reactor modulated lithium-sulfur battery had an initial discharge specific capacity of 1305.7 mA∙h/g at 0.1C, 684.7 mA∙h/g at 5C multiplicity, and the discharge specific capacity was maintained at 795.4 mA∙h/g after 200 cycles at 1C.

关键词

TiO₂-TiSe₂/纳米碳纤维膜 / 锂硫电池 / 高倍率性能 / 膜反应器 / 锂硫反应动力学

Key words

TiO₂-TiSe₂ carbon nanofiber membrane / Lithium-sulfur battery / High-rate performance / Membrane reactor / Lithium-sulfur reaction kinetics

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基金资助

国家自然科学基金(22361035, 22461030)

内蒙古自然科学基金(2024QN02013)

内蒙古草原英才-青年领军人才计划(KYCYYC24001, KYCYYC25002)

自治区级事业单位引进优秀人才和科研启动绩效项目(RCQD20002)

内蒙古民族大学博士科研基金(KYQD21002, KYQD23005)

内蒙古自治区直属高校基本科研业务费(GXKY25Z009)

内蒙古自治区高校创新团队计划(NMGIRT2417)

内蒙古自治区重点实验室创新平台建设项目(KJJH2402, SYS25003)

内蒙古自然科学基金重点联合项目(2025ZDLH004)

无机合成与制备化学全国重点实验室开放资金(25-11)

锂硫电池储能内蒙古自治区工程研究中心开放课题(MDK2024057)