两电子反应体系硅酸铁锂的研究进展
摘要
Developing cathode materials with high capacity is scientifically and technologically important for Li-ion batteries. Lithium iron silicate (Li<sub>2</sub>FeSiO<sub>4</sub>) possesses a potential for two-electron redox reaction, thus can offer a theoretical capacity as high as 331 mA h/g, which is twice that of conventional cathodes. However, high capacity of Li<sub>2</sub>FeSiO<sub>4</sub> has often been compromised due to extremely low electronic conductivity and ion diffusivity. To address such issues, great efforts have been devoted and significant progress has been made during the last decade. In this review, we briefly summarize what has been achieved and what issues remain on advancing this Li<sub>2</sub>FeSiO<sub>4</sub> material, with emphasis on its structural characteristics, synthetic techniques, modified methods, and electrochemical mechanism. We foresee a bright future for the application of Li<sub>2</sub>FeSiO<sub>4</sub> in advanced Li-ion batteries.