Lithium iron phosphate material composition for 300ah large capacity cells

By introducing a nonlinear gradient distribution of niobium and titanium elements into lithium iron phosphate materials, a near-single-crystal structure and an inward compressive stress field are constructed, which solves the problem of brittle fracture of the material during the rolling process and improves the structural stability and electrochemical performance of high-capacity cells.

CN122417880APending Publication Date: 2026-07-17益阳长天新能源科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
益阳长天新能源科技有限公司
Filing Date
2026-06-16
Publication Date
2026-07-17

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Abstract

本发明涉及无机金属化合物技术领域，公开了一种用于300Ah大容量电芯的磷酸铁锂材料组合物，包括磷酸铁锂基体、铌元素以及钛元素，铌元素与钛元素的摩尔比为0.15至0.28，且铌元素在距离颗粒表面100nm至300nm深度区间内具有非线性浓度梯度层，颗粒为内部微孔隙率为0.5%至1.2%的类单晶致密实体，通过铌元素与钛元素共同占据过渡金属位点以诱发局域晶格畸变，从而在颗粒表层构建内向压缩应力场，本发明利用内向压缩应力场在颗粒受压时产生能量耗散效应，抵消外部压实载荷，维持类单晶结构完整，抑制界面副反应。
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