凭借高性能和低成本的优势，硅酸亚铁锂成为了当前锂离子电池领域的研究热点，但是低的电导率成为制约该材料应用的首要问题。本项目拟在已有工作基础上，基于缺陷化学理论，以有序介孔二氧化硅为硅源设计合成缺锂型硅酸亚铁锂介孔材料。重点研究材料中缺锂的形成机制，确定其控制步骤；探讨目标材料中缺锂的组成与性能关系，从而深入研究缺锂效应的内在原因，揭示缺锂对硅酸亚铁锂本体电子结构和晶体结构的影响；考察缺锂型硅酸亚铁锂的前几次锂离子脱嵌过程中电位平台、结构及物相变化规律，总结材料的储锂机制。本项目将从理论和实践两个层面丰富无机材料的缺陷化学理论和相应的制备科学。

Li2FeSiO4 has attracted lots of attention as cathode material for Li-ion battery due to its high performance and low cost. Unfortunately, the key problem of low conductivity has limited its further applications. In this project,on the basis of our previous work and defect chemistry theory,mesoporous Li2-xFeSiO4 will be synthesized via ordered mesoporous silica as silicon source.This project focuses on the formation mechanism and determining the control steps of lithium deficiency in Li2FeSiO4. The relationship between the lithium deficient composition and performance of as-prepared material will be investigated and then the in-depth study of internal reasons of lithium deficient effects based on the electronic structure and crystal structure will be further discussed.The plateaus, structural and phase variations during the first several lithium insertion/extraction process will be studied and lithium storage mechanism of Li2FeSiO4 will be summarized.This project will develop the defect chemistry and preparation method of inorganic compounds from theory to practice.