先进磷酸铁锂正极高效储锂设计与调控

作者：Danchen Fu, Qingyang Cao, Huawei Song, Chengxin Wang · 发表于：Chinese Science Bulletin (Chinese Version) · 年份：2024 · DOI：10.1360/tb-2023-1275 · 被引用次数：1 · 研究领域：Advancements in Battery Materials、Advanced Battery Technologies Research、Supercapacitor Materials and Fabrication

Lithium ion batteries (LIBs) have the advantages of high energy density, good cycling stability, and no memory effect, and have been widely used in various fields such as portable electronic products, electric vehicles, smart grids, and others. Among the numerous cathode materials for lithium-ion batteries, the polyanion cathode material has the advantages of easy production and low cost, as well as a theoretical voltage range of 2.0–4.8 V, making it an excellent cathode material. LiFePO4 has become the most widely used cathode material due to its high theoretical capacity, great cost-effectiveness, good safety, and environmental friendliness. However, due to the fact that in the orthorhombic crystal system of lithium iron phosphate with the Pnma space group, PO43− leads to the segregation of FeO6, which reduces the electronic conductivity and the rate of ionic diffusion along the b-axis, resulting in poor rate performance of pure LiFePO4. The utilization of crystallographic engineering to regulate the crystal size and morphology of LiFePO4 has greatly improved its electrical conductivity, enhanced its practical capacity, multiple performance and cycling stability, and realized the large-scale application of lithium iron phosphate in commerce. The common synthesis methods can be divided into liquid-phase and solid-phase methods. The solid-phase method has the advantage of a simple production process, making it easy to achieve large-scale production. Meanwhile, liquid-phase me...