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基于半导体光电极构筑新型太阳能辅助充电锂硫电池及其电化学性能调控

批准号51602044 学科分类无机非金属能量存储材料 ( E021002 )
项目负责人李娜 负责人职称教授 依托单位东北大学
资助金额20.00
万元
项目类别青年科学基金项目 研究期限2017 年 01 月 01 日 至
2019 年 12 月 31 日
中文主题词锂硫电池;太阳能存储;半导体;光电极
英文主题词lithium-sulfur battery;solar energy storage;semiconductor;photoelectrode

摘要

中文摘要 新型太阳能可充电储能器件可以实现太阳能至电能的直接转化与存储,能够有效缓解能源危机和环境污染问题,同时可避免电子产品充电时对电网的依赖。而至今报道的太阳能可充电储能器件普遍面临放电容量和光-电转化存储效率低的瓶颈。基于锂硫电池具有高的比容量和能量密度(为目前商品化锂离子电池的3-7倍)的优点,本项目提出通过半导体光电极的植入,利用其在光照下产生的光生空穴和电子分别将正极硫离子氧化和负极锂离子还原,构建太阳能辅助充电锂硫电池的新思路。光照充电时,光电极产生的光电压部分补偿充电电压,间接实现太阳能至电能的转化存储。深入研究半导体光电极的本征结构特性对电池的作用机制,旨在建立半导体导带位置、带隙宽度、表面结构对太阳能辅助充电锂硫电池性能的调控规律,并阐明其调控机理,进而构建高效稳定的太阳能辅助充电锂硫电池,为其他光-电转化存储器件的设计提供科学依据和指导。
英文摘要 A new prototype of solar-driven chargeable energy storage device for direct conversion and storage of solar energy can not only provide a promising solution to the challenges of energy shortage and environment pollution, but also avoid the dependence of powering portable electronics on the power grid. However, the solar-driven chargeable energy storage devices reported to date exhibited a very low overall photo-electric storage-conversion efficiency and discharge capacity. The search for an effective solar energy storage system is highly required, yet remains a challenge. Lithium-sulfur (Li-S) battery exhibits 3-7 times higher energy density than that of conventional lithium-ion batteries, and thus makes a promising choice for solar energy storage. In this project, we proposed a new strategy to build a solar-assisted chargeable Li-S battery by integrating a photoelectrode in the cathode. With the aid of photoelectrode, the solar energy will be utilized to simultaneously oxidize discharge products S2- ions to polysulfide ions in cathode and reduce Li+ ions to metal Li, realizing the charge process. On charging under illumination, the photovoltage generated on the photoelectrode will compensate the Li-S battery’s charging voltage. By utilizing photoelectrode, this designed device will realize the storage of solar energy in Li-S batteries. Various photoelectrodes will be utilized to study the effect of photoelectrode on the solar-assisted chargeable Li-S battery. This study will clarify the mechanism and general rules of effects of the conduction band, band gap and surface structure of photoelectrode on electrochemical performance of solar-assisted chargeable Li-S battery. The results obtained could guide the development of high-efficiency and stable solar-driven chargeable energy storage devices.
结题摘要

成果

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