类球形低硫磷酸铁的制备技术研究

doi:10.11962/1006-4990.2019-0367

摘要/Abstract

摘要：

磷酸铁（FePO₄）是锂电池正极材料磷酸铁锂（LiFePO₄）的核心前驱体,FePO₄形貌及硫含量对合成的LiFePO₄材料性能有重要影响。为得到类球形低硫FePO₄产品,在传统液相沉淀法技术基础上做了改进优化,添加十六烷基三甲基溴化铵（CTAB）作为形貌助剂提高产品球形度,添加氨水作为配体形成磷酸铁铵配合物改善结晶过程,降低产品硫含量。结果表明：所制备的FePO₄产品硫质量分数低,达到2.6×10 ^-5,形貌为均一的微米类球形颗粒,D₅₀=11.4 μm,振实密度达到1.22 g/cm ³,有望成为制备高压实密度LiFePO₄材料的核心前驱体。

关键词: 正极材料, 低硫, 磷酸铁, 磷酸铁锂

Abstract:

FePO₄ is the core precursor of LiFePO₄.The morphology and sulfur content of FePO₄ products have important ef-fects on the properties of the synthesized LiFePO₄ materials.To obtain spherical-like and low-sulfur FePO₄ products,the tradi-tional liquid phase precipitation method was improved and optimized.Adding CTAB as a morphology additive to improve the sphericity of the products,and adding ammonia water as a ligand to form the ammonium ferric phosphate complex in order to improve the crystallization process and reduce the sulfur content of the product.The results showed that the prepared FePO₄ products have low sulfur content of up to 2.6×10 ^-5 and were homogeneous micro-spherical-like particles with D₅₀=11.4 μm and tap density of 1.22 g/cm ³ that are expected to be the core precursors for the preparation of high compacted deasity LiFePO₄ materials.

Key words: cathode material, low sulfur, iron phosphate, LiFePO₄

中图分类号:

TQ138.11

郭举,贾双珠. 类球形低硫磷酸铁的制备技术研究[J]. 无机盐工业, 2020, 52(5): 31-34.

Guo Ju,Jia Shuangzhu. Study of the method for the preparation of spherical-like and low sulfur FePO₄[J]. Inorganic Chemicals Industry, 2020, 52(5): 31-34.

图/表 5

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反应时间/h	振实密度/（g·cm^-3）	反应时间/h	振实密度/（g·cm^-3）
5	0.89	30	1.20
10	1.03	50	1.22
20	1.14

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