Method for preparing lithium iron phosphate positive pole material through hydrothermal method

A lithium iron phosphate and cathode material technology, applied in chemical instruments and methods, phosphorus compounds, battery electrodes, etc., can solve the problems of wide particle size distribution, uneven particles, and high reaction temperature, to improve rate performance, reduce Effects of reaction temperature and high specific surface area
CN103259015AInactive Publication Date: 2013-08-21XIAN TECHNOLOGICAL UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
XIAN TECHNOLOGICAL UNIV
Publication Date
2013-08-21
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a lithium ion battery positive pole material, and particularly relates to a method for preparing a lithium iron phosphate positive pole material through a hydrothermal method. The method aims at solving the problems of nonuniform granule, irregular crystal, wide size distribution range, high reaction temperature, long synthesis period, poor product batch stability and material property stability influence in the prior art. In order to solve the problems in the prior art, the technical scheme is as follows: the method for preparing the lithium iron phosphate positive pole material through the hydrothermal method sequentially comprises the following steps of: (1) weighing LiOH.H2O and 85% H3PO4, dissolving the LiOH.H2O into deionized water, slowly dripping strong phosphoric acid into an LiOH.H2O solution, centrifugalizing to obtain Li3PO4 white precipitates, and carrying out vacuum drying to obtain Li3PO4 powder; (2) weighing Li3PO4 and (NH4)2Fe(SO4)2.6H2O, adding the deionized water to dissolve in a beaker, adding reducing agent glucose at the same time, and uniformly stirring; and (3) reacting, then cooling to room temperature, carrying out microwave oscillation, centrifugalizing a lotion for separation, and drying to obtain LiFePO4 powder.
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Description

technical field

[0001] The invention relates to a lithium ion battery cathode material, in particular to a method for preparing a lithium iron phosphate cathode material by a hydrothermal method. Background technique

[0002] The performance of lithium-ion batteries depends on the positive and negative electrode materials, LiFePO 4 As a battery cathode material, it has the advantages of high specific capacity, low raw material price, environmental friendliness, high safety, and good cycle performance, and has become the most potential lithium-ion power battery cathode material. Compared with traditional lithium cobalt oxide cathode materials, LiFePO 4 It also has the advantages of abundant sources, low cost, environmental friendliness and non-moisture absorption, high specific capacity, stable voltage platform, thermal stability and good cycle performance.

[0003] The solid phase method is the current preparation of LiFePO 4 Commonly used methods, but it is difficult...

Claims

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