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CN102185137A 一种多层次包覆多元复合磷酸铁锂正极材料的制备方法 无效 - 驳回

一种多层次包覆多元复合磷酸铁锂正极材料的制备方法
摘要：
一种多层次包覆多元复合磷酸铁锂正极材料的制备方法，涉及一种锂离子电池正极材料。将主原料Fe(OH)3、Li2CO3、NH4H2PO4和掺杂金属离子M的氧化物按照化学计量比加入到球磨机中，加入去离子水和锆球做研磨介质，球磨后，干燥，过筛；将干燥后的物料在氩气保护下煅烧；将煅烧后的一次烧结料过筛，加入高分子有机碳源进行第二次炭包覆，再加入去离子水，球磨后干燥；将所得物料在氩气氛围下烧结，冷却后即得多层次包覆多元复合磷酸铁锂正极材料。制备工艺稳定，步骤相对简单，特别是产品重现性良好，非常容易实现产业化生产。
摘要（英）：

A preparation method of a multilevel-coated multivariate composite lithium iron phosphate cathode material relates to a lithium ion battery cathode material. The method comprises the following steps: feeding main raw materials of Fe(OH)3, Li2CO3, NH4H2PO4 and oxide doped with metal ions into a ball mill according to a stoichiometric ratio, adding deionized water and zirconium balls as milling media; performing ball milling, drying, and sieving; sintering the dried materials in argon atmosphere; sieving the primary sintered materials after calcination, adding polymer organic carbon source for carbon coating for the second time, adding deionized water, performing ball milling and drying; sintering all the materials in argon atmosphere, cooling to obtain a multilevel-coated multivariate composite lithium iron phosphate cathode material. The preparation process is stable; the steps are simple; especially the product reproducibility is good; and industrial production is quite easy to realize.

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