氧化铜基核壳结构纳米材料的制备及作为锂离子电池负极的电性能研究

项目名称： 氧化铜基核壳结构纳米材料的制备及作为锂离子电池负极的电性能研究

项目编号： No.21463028

项目类型： 地区科学基金项目

立项/批准年度： 2015

项目学科： 数理科学和化学

项目作者： 冯莉莉

作者单位： 云南民族大学

项目金额： 48万元

中文摘要： 过渡金属氧化物在作为锂离子电池负极应用时，表现出较高的比容量(>600 mAh/g)，很好的倍率充放电性能和较高的安全性。因此，本项目将探索核壳结构的空心CuO纳米材料在无硬模板条件下的可控制备和该材料作为锂离子电池负极时的电化学性能。 针对金属氧化物导电性差、在反复充放电过程中易粉化团聚，而导致电化学循环稳定性差的缺陷，通过制备具有核壳结构和同时具有空心结构的CuO纳米材料，利用空心结构的弹性，使反复充放电引起的应力得以释放，并以壳结构阻止核结构的应力变化和破裂情况的发生，进而防止材料的粉化，以期制备得到比容量大、充放电循环性能稳定、库仑效率较高、可以大放电倍率充放电的锂离子电池负极材料。 西部地区的云南省素称有色金属王国，铜储量居全国第3位，资源非常丰富。本项目的研究将丰富CuO复合纳米材料用作锂离子电池的负极的基础科学理论，并且将为云南省铜资源的利用进一步提供科学依据。

中文关键词： 纳米材料；锂离子电池；氧化铜；核壳结构；电化学性能

英文摘要： Transition metal oxides owing high theoretic capacity (> 600 mAh/g), good rate capability and good safety, are ideal candidates as anode materials for lithium-ion batteries. Therefore, in this research, we will investigate the controllable preparation of hollow nano cupric oxide without hard template, then core-shell structure modification will be made. Finally, electrochemical performance of the as-prepared sample as anode material for lithium-ion battery will be studied. The transition metal oxides have poor electrochemical cyclic performance due to the poor conductivity and the pulverization in repeated charging and discharging process. We designe a CuO nano-material which has core-shell structure and hollow structure at contemporary to solve the problem. The stress force caused by repeated charging and discharging process can be released owing to the elastic of the hollow structure. And the core-shell structure will prevent the pulverization phenomenon as for the shell layer will prevent the stress force accumulation and rupture of the nuclear layer. In this study, we hope to prepare CuO nano-material as lithium-ion battery anode material with high speci?c capacity, cycling performance, high coulombic efficiency, good rate capability and good safety. Yunnan Province in the western region called the kingdom of nonferrous metals. Yunnan Province holds the third-largest copper reserves all over our country. Therefore the copper resources are very rich. This research will enrich the base scientific theory of CuO composite nanomaterial as anode material for lithium-ion battery and enrich the scientific basis for the use of copper resources in Yunnan Province.

英文关键词： nano-material;lithium-ion battery;cupric oxide;core-shell structure;electrochemical performance