Composite lithium iron phosphate material and preparation method thereof

• Main Authors: LIAN SHUIPING, LIU ZURONG, XU CHAQING, XU YUNLING
• Format: Patent
• Language: Chinese; English
• Published: 31.03.2023
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention provides a composite lithium iron phosphate material and a preparation method thereof, the composite lithium iron phosphate material comprises an inner core and a shell layer coating the inner core, the material of the inner core comprises LiFe < 1-x > MxPO4, the shell layer comprises a carbon layer, and a lithium metal oxide containing an L element is also embedded in the carbon layer; wherein 0 lt; xlt; the M element and the L element are independently selected from one or more of Mg, Al, Zr, Ti, Co, V, Mn, W, Sn, Nb and Mo. And the low temperature, high temperature, power, cycle performance and safety of the lithium iron phosphate material are obviously improved. 本申请提供了一种复合磷酸铁锂材料及其制备方法，所述复合磷酸铁锂材料包括内核和包覆在所述内核上的壳层，所述内核的材料包括LiFe1-xMxPO4，所述壳层包括碳层，所述碳层中还嵌有含L元素的锂金属氧化物；其中，0<x<0.05，所述M元素和所述L元素独立地选自Mg、Al、Zr、Ti、Co、V、Mn、W、Sn、Nb、Mo中的一种或多种。显著提高了磷酸铁锂材料的低温、高温、功率、循环性能和安全性。