过渡金属(Fe, Co)草酸盐/氧化物具有储锂容量大、成本低及环境友好等优异特性, 被视为极具潜力的锂离子电池阳极材料. 但其存在着电化学稳定性较差、实际可逆容量有待于提高等问题. 本项目基于自腐蚀反应原理制备过渡金属(Fe, Co)草酸盐晶体一维微纳米阵列膜, 进一步通过适当的热处理获得无水草酸盐/氧化物一维微纳米阵列膜, 并探究其电化学储锂性能. 系统研究基于自腐蚀反应原理制备过渡金属草酸盐晶体一维微纳米阵列膜的电极过程与成膜机制, 探明金属层的组成与结构、草酸浸蚀液的组成、浸蚀温度及时间等参数对一维微纳米阵列膜结构的影响规律, 明晰膜制备的关键控制因素, 实现过渡金属草酸盐晶体一维微纳米阵列膜的可控制备. 查明热处理条件对过渡金属无水草酸盐/氧化物一维微纳米阵列膜组成及微观结构的影响规律, 揭示这些微纳米阵列膜的储锂性能与微观结构的内在关联, 明晰提高其电化学储锂性能的有效途径.

Transition metal (Fe, Co) oxalates/oxides are considered as promising anode materials for lithium-ion batteries because of their distinctive properties, such as high lithium storage capacity, low cost and environmental friendship. However, the electrochemical cycle stability of the investigated transition metal oxalates/oxides is relatively poor, and their reversible capacities need to be further improved. In this project, one-dimensional (1D) transition metal (Fe, Co) oxalate crystals micro-nanoarray films are fabricated by the method based on self-corrosion principle, and the subsequent heat treatments lead to the formation of anhydrous oxalates/oxides 1D micro-nanoarray films, and then the lithium storage properties of these anhydrous 1D micro-nanoarray films are probed in detail. The electrode processes and formation mechanisms of the transition metal oxalate crystals 1D micro-nanoarray films fabricated by the method based on self-corrosion principle are explored, and the effects of metal precursor, oxalic acid solution, temperature and immersion time on the micro-nanoarray films are investigated. The key preparative factors are identified, and finally the controllable fabrication of the transition metal oxalate crystals 1D micro-nanoarray films is realized. We try to clarify the effects of heat treatment parameters on the compositions and microstructures of the anhydrous oxalates/oxides 1D micro-nanoarray films. The intrinsic relationship between the lithium storage properties and microstructures of the anhydrous oxalates/oxides 1D micro-nanoarray films needs to be elucidated. It is expected that the effective approaches for improving the lithium storage performance are identified, and the anhydrous oxalates/oxides 1D micro-nanoarray films with superior lithium storage performance can be obtained.