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Preparation method of lithium iron phosphate cathode material

A positive electrode material, lithium iron phosphate technology, applied in the direction of chemical instruments and methods, phosphorus compounds, battery electrodes, etc., can solve problems that hinder application and development, low tap density, poor low temperature performance, etc., and achieve low production cost and raw material Extensive, cost-reducing effects

Pending Publication Date: 2021-02-26
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its low temperature performance is poor, the tap density is small, and the actual specific capacity is low, which hinders the application and development of this material.

Method used

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  • Preparation method of lithium iron phosphate cathode material
  • Preparation method of lithium iron phosphate cathode material

Examples

Experimental program
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Effect test

Embodiment 1

[0023] A lithium iron phosphate positive electrode material, which is synthesized in one step by hydrothermal stripping method using cheap and easy-to-obtain ferrous salt or iron salt, lithium dihydrogen phosphate and an organic extractant as raw materials, according to the following steps:

[0024] (1). Preparation of iron-containing organic solution

[0025] In the beaker, add extractant and diluent sequentially at a volume ratio of 2:1, add ammonia water for saponification under stirring, and then add FeCO 3 solution, stirred for 30 minutes, and then separated and washed to obtain Fe-containing 2+ organic solution;

[0026] (2). Preparation of water phase

[0027] Molebi Fe 2+ : Li + Weigh LiOH at a ratio of 1:1, add water until it is completely dissolved, and add 3mol / L H 3 PO 4 , so that Li + and PO 4 3- The molar ratio is 1.2:1, and then add a small amount of ascorbic acid;

[0028] (3). Hydrothermal stripping synthesis

[0029] Put the iron-containing organi...

Embodiment 2

[0032] A lithium iron phosphate positive electrode material, the same steps as in Example 1, except that the ferrous salt is different, which is FeCl 2 , follow the steps below:

[0033] (1). Preparation of iron-containing organic solution

[0034] In the beaker, add extractant and diluent sequentially at a volume ratio of 2:1, add ammonia water for saponification under stirring, and then add FeCl 2 solution, stirred for 30 minutes, and then separated and washed to obtain Fe-containing 2+ organic solution.

[0035] (2). Preparation of water phase

[0036] Molebi Fe 2+ : Li + Weigh LiOH at a ratio of 1:1, add water until completely dissolved, add a certain volume of 3mol / L H under stirring conditions 3 PO 4 and Li + PO 4 3- The molar ratio is 1.3:1 and a small amount of ascorbic acid.

[0037] (3). Hydrothermal stripping synthesis

[0038] Put the iron-containing organic phase and the water phase into the high-pressure reactor, seal it well and start stirring, heat...

Embodiment 3

[0040] A lithium iron phosphate positive electrode material, the same steps as in Example 1, except that the hydrothermal reaction conditions are different, which is FeCl 2 , follow the steps below:

[0041] (1). Preparation of iron-containing organic solution

[0042] In the beaker, add extractant and diluent sequentially at a volume ratio of 2:1, add ammonia water for saponification under stirring, and then add FeCO 3 solution, stirred for 30 minutes, and then separated and washed to obtain Fe-containing 2+ organic solution;

[0043] (2). Preparation of water phase

[0044] Molebi Fe 2+ : Li + Weigh LiOH at a ratio of 1:1, add water until completely dissolved, add a certain volume of 3mol / L H under stirring conditions 3 PO 4 and Li + PO 4 3- A molar ratio of 2:1 and a small amount of ascorbic acid;

[0045] (3). Hydrothermal stripping synthesis

[0046] Put the iron-containing organic phase and the water phase into the autoclave, seal it well, start stirring, he...

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Abstract

The invention relates to a preparation method of a lithium iron phosphate positive electrode material, which is characterized in that cheap and easily available ferrite or ferric salt, lithium dihydrogen phosphate and an organic extraction agent are used as raw materials, and a hydrothermal reverse extraction method is adopted to synthesize the lithium iron phosphate positive electrode material ofa lithium battery in one step. The lithium iron phosphate positive electrode material is synthesized in one step by adopting a hydrothermal reverse extraction method, so that the problems of complexraw material source and preparation process are solved, and meanwhile, the production cost is reduced. According to the preparation method provided by the invention, the lithium iron phosphate electrode material is synthesized by a one-step hydrothermal reverse extraction method, and has the characteristics of simple process, wide raw material sources, low production cost and the like.

Description

technical field [0001] The invention relates to a lithium ion battery cathode material, in particular to a preparation method of a lithium iron phosphate cathode material. Background technique [0002] The demand for secondary batteries with high specific energy, high specific power, long life and low cost has become increasingly urgent for portable electronic devices, electric vehicles and energy storage systems. Due to its many advantages, lithium-ion batteries have become the protagonists that have attracted much attention in the field of secondary energy. [0003] The performance of the battery mainly depends on the electrode material. Lithium iron phosphate, as the cathode material of lithium-ion batteries, has good safety performance. The standard charging cycle life can reach more than 2000 times, and it has good high temperature resistance. However, its poor low-temperature performance, low tap density, and low actual specific capacity hinder the application and de...

Claims

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Application Information

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IPC IPC(8): C01B25/45H01M4/58H01M10/0525
CPCC01B25/45H01M4/5825H01M10/0525C01P2004/03C01P2006/40Y02E60/10
Inventor 崔大祥王亚坤张芳卢玉英阳靖峰焦靖华葛美英张放为
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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