C/SiO2多孔双连续纳米复合材料的可控制备及其在锂离子电池中的应用研究

本项目拟采用溶胶-凝胶法原位制备具有多孔双连续纳米结构的新型锂离子电池用C/SiO2复合负极材料。该方法的优势体现在（1）制备工艺简单，条件温和；（2）材料纳米结构均匀；（3）纳米结构可精确调控，便于进行电化学性能导向的纳米结构设计。项目拟通过对SiO2凝胶网络、炭骨架及纳米孔洞结构的精确调控来改善或解决SiO2基负极材料所存在的导电性较差、锂离子迁移困难、体积变化等问题，并着重研究SiO2连续相和炭连续相在储锂过程中的作用机制及其协同效应规律。在此基础上阐明纳米结构与电化学性能的关联性，建立性能导向的纳米结构控制理论，从而构筑锂离子电池用C/SiO2纳米复合材料的最优结构模型。本项目将有力地促进锂离子电池负极材料制备科学的进步，具有重要的理论意义和应用价值。

In this project, we will develop a novel kind of C/SiO2 composites with porous bicontinuous nanostructure via sol-gel method for lithium-ion battery (LIBs) application. This method presents three advantages: (1) simple preparation procedure with mild preparation condition; (2) homogeneous nanostructure; (3) controllable nanostructure, which is beneficial to performance optimization. The nanostructure of SiO2 gel nanonetwork, carbon skeleton and nanopores will be precisely tailored to improve and/or solve the problems existed in traditional SiO2-based electrode, e.g., low conductivity and lithium ion transfer capability, and volume variation. Meanwhile, the synergistic effect of SiO2 and carbon continuous phase for lithium storage will be studied. On the above basis, the relationship between nanostructure and electrochemical performance of the composites will be revealed. As a result, the design and control principles of nanostructures for performance oriented will be elucidated. In conclusion, this project will greatly develop preparation theories of electrode materials for LIBs, demonstrating important theoretic significance and application value.