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新型二维ZnCo六角片的结构设计及其储锂机制

批准号51701042 学科分类金属能源和环境材料 ( E010504 )
项目负责人蒋颖畅 负责人职称博士后 依托单位复旦大学
资助金额25.00
万元
项目类别青年科学基金项目 研究期限2018 年 01 月 01 日 至
2020 年 12 月 31 日
中文主题词ZnCo氢氧化物六角片;硫化物;磷化物;合金;储锂机制
英文主题词ZnCo hydroxides hexagonal nanosheets ;sulfide;phosphide;alloy;lithium storage mechanism

摘要

中文摘要 能源和环境是人类赖以生存和发展的基础,开发高容量、高能量密度、高倍率性能和高循环性能锂离子电池负极材料,是推动纯电动汽车(EV)和混合动力(PHEV)汽车发展的迫切需求。最近,二维层片状结构的无机氢氧化物及其衍生物被认为是具有赝电容行为和高倍率下充放电能力的负极材料。本项目拟开发新型电化学储锂材料,针对申请人近期合成出一种高横纵比、但结构和成份未知的钴基氢氧化物六角片系列物质,将探明其合成机制、分析其化学成份、解析其晶体结构,进一步揭示其向硫化物、磷化物、二元ZnCo合金的热转变过程与机理,开发这类二维六角片系列物质的储锂性能,阐明其赝电容行为及储锂机制。本项目的研究结果将为动力型锂离子电池负极提供新的材料体系和科学依据。
英文摘要 Energy and environment is the foundation of human survival and development. The development of anode materials with high capacity, energy density, outstanding high-rate ability and long-term cyclability is very important for the realization of large-scale practical applications such as electric vehicles (EVs), hybrid electrical vehicles (HEVs). Recently, the two-dimensional (2D) layered inorganic hydroxide nanosheets and their derivatives have been considered as promising candidate anodes for next-generation lithium ion batteries due to pseudocapacitance behavior and high-rate charge/discharge ability. The motivation of this study is to develop novel energy materials for lithium storage. Based on previous work, we have large-scaled synthesized novel Co-Zn hydroxide hexagonal nanosheet with a high aspect ratio. However, their chemical composition and crystal structure are still unknown. In this project, the reactive mechanism, chemical composition and crystal structure of this matter will be revealed after optimizing the synthetic condition. Furthermore, the thermal transformation from these hydroxide nanosheets into their corresponding 2D hexagonal sulfide, phosphide, ZnCo binary alloy nanosheets will be studied. The high-rate lithiation/delithiation process and the lithium-storage mechanism of this ZnCo nanosheet series will be revealed based on pseudocapacitance behavior. The outcomes yielded from this project may provide novel anode material system and scientific evidence for power lithium-ion batteries.
结题摘要

成果

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