类球形低硫磷酸铁的制备技术研究

doi:10.11962/1006-4990.2019-0367

无机盐工业 ›› 2020, Vol. 52 ›› Issue (5): 31-34.doi: 10.11962/1006-4990.2019-0367

类球形低硫磷酸铁的制备技术研究

郭举^1,^2,³,贾双珠^2,⁴

1.茅台学院,贵州仁怀 564507;
2.贵州大学;
3.中低品位磷矿及其共伴生资源高效利用国家重点实验室;
4.黔南州民族师范学院

收稿日期:2019-11-11 出版日期:2020-05-10 发布日期:2020-05-21
作者简介:郭举（1983— ）,男,硕士研究生,高级工程师,主要从事化学化工教学及化工新技术开发与应用研究;E-mail：158383434@qq.com。
基金资助:
中低品位磷矿及其共伴生资源高效利用国家重点实验室开放基金课题(WFKF2017-02)

Study of the method for the preparation of spherical-like and low sulfur FePO₄

Guo Ju^1,^2,³,Jia Shuangzhu^2,⁴

1.Maotai College,Renhuai 564507,China;
2.Guizhou University;
3.State Key Laboratory for Efficient Utilization of Low-and edium-grade Phosphate Ores and Their Associated Resources;
4.Qiannan Normal University for Nationalities

Received:2019-11-11 Published:2020-05-10 Online:2020-05-21

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

图1

图2

图3

图4

表1

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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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类球形低硫磷酸铁的制备技术研究

Study of the method for the preparation of spherical-like and low sulfur FePO₄

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Study of the method for the preparation of spherical-like and low sulfur FePO₄