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Porous lithium ion battery positive electrode material and preparation method and application thereof

A technology of lithium ion battery and positive electrode material, applied in the field of positive electrode material of porous lithium ion battery and its preparation, can solve the problems of uneven particle size of lithium iron phosphate material, affecting lithium ion diffusion rate and conductivity, affecting battery performance, etc. The compacted density is unaffected, suitable for industrial production, and the preparation method is simple.

Inactive Publication Date: 2018-12-18
WUHU ZHANGHONG ENG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the conventional preparation method of lithium iron phosphate, the particle size of the obtained lithium iron phosphate material is uneven, and it is prone to agglomeration, which will seriously affect the diffusion rate and conductivity of lithium ions, and then affect the performance of the battery.

Method used

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  • Porous lithium ion battery positive electrode material and preparation method and application thereof
  • Porous lithium ion battery positive electrode material and preparation method and application thereof
  • Porous lithium ion battery positive electrode material and preparation method and application thereof

Examples

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Embodiment 1

[0031] A preparation method for a porous lithium-ion battery cathode material, comprising the following steps:

[0032] S1. Dissolving ferrous phosphate octahydrate and lithium hydroxide in deionized water, adding sodium dodecylbenzenesulfonate and oxalic acid thereto, and adjusting the pH to 4.8 to obtain a mixed precursor solution; the phosphoric acid octahydrate The ratio of the amount of ferrous iron to lithium hydroxide is 1:1.0; the concentration of the ferrous phosphate in deionized water is 0.25mol / L; the final concentration of the additive in the mixed precursor solution is 5.3mg / L L; The final concentration of the surfactant in the mixed precursor solution is 5.2mg / L;

[0033] S2. Under the protection of nitrogen, hydrogen and mixed gas, the mixed precursor solution is calcined at 682° C. for 12 hours at a volume ratio of nitrogen to hydrogen of 92:8. After cooling, it is pulverized to a particle size of 80-120 mesh ; The porous lithium iron phosphate porous lithium...

Embodiment 2

[0043] A preparation method for a porous lithium-ion battery cathode material, comprising the following steps:

[0044] S1, dissolving ferrous phosphate tetrahydrate and lithium carbonate in deionized water, and adding sodium dodecylsulfonate and ammonium bicarbonate to it, adjusting the pH to 5.0 to obtain a mixed precursor solution; the ferrous phosphate With the ratio of the amount of substance of lithium carbonate 1:1.2; The concentration of the ferrous phosphate tetrahydrate in deionized water is 0.5mol / L; The final concentration of the additive in the mixed precursor solution is 8.5mg / L; The final concentration of the surfactant in the mixed precursor solution is 6.7mg / L;

[0045] S2. Under the protection of nitrogen, hydrogen and mixed gas, the mixed precursor solution is calcined at 700°C for 10 hours at a volume ratio of nitrogen to hydrogen of 95:5, and after cooling, it is crushed to a particle size of 80-120 mesh ; The porous lithium iron phosphate porous lithium ...

Embodiment 3

[0047] A preparation method for a porous lithium-ion battery cathode material, comprising the following steps:

[0048] S1, dissolving ferrous phosphate octahydrate and lithium dihydrogen phosphate in deionized water, and adding surfactants and additives thereto to adjust the pH to 4.5 to obtain a mixed precursor solution; the ferrous phosphate and lithium source The ratio of the amount of substance is 1:1.2; the concentration of the ferrous phosphate in deionized water is 0.38mol / L; the final concentration of the additive in the mixed precursor solution is 5mg / L; the surfactant is in The final concentration in the mixed precursor solution is 3.3mg / L;

[0049]S2. Under the protection of nitrogen, hydrogen and mixed gas, the mixed precursor solution is calcined at 660° C. for 14 hours at a volume ratio of nitrogen to hydrogen of 94:6. After cooling, it is crushed to a particle size of 80-120 mesh ; The porous lithium iron phosphate porous lithium ion battery cathode material c...

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Abstract

The invention discloses a porous lithium ion battery positive electrode material and a preparation method and application thereof. First, a precursor solution is prepared by adding a surfactant and anadditive to an aqueous solution of ferrous phosphate and a lithium source, and the precursor solution is further calcined at a high temperature to form a final porous lithium iron phosphate lithium ion battery positive electrode material. Through the addition of the surfactant, the agglomeration of the product can be avoided, and the dispersibility of the final product is good; through the addition of the additive easy to decompose and gasify, the additive can be gasified and decomposed during the calcination process to make lithium iron phosphate porous. The porous lithium ion battery positive electrode material is beneficial to sufficient penetration of an electrolyte, thereby improving the conduction efficiency of lithium ions and reducing the internal resistance of a lithium ion battery so as to obtain the lithium ion battery with good cycle performance and high energy density.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery preparation, and in particular relates to a porous lithium-ion battery positive electrode material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries are by far the most versatile and adaptable secondary batteries. As a new type of green power source, lithium-ion batteries have many excellent properties, such as high energy density, long cycle life, high open circuit voltage, no memory effect, safety and pollution-free, etc. Lithium-ion batteries are assembled from positive and negative electrode materials, and the positive electrode material, as an integral part, has an important impact on the performance of the battery. [0003] Among many positive electrode materials, lithium iron phosphate LiFePO4 (LFP) with an olivine structure is becoming more and more popular due to its low price, safety and environmental protection, high speci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45H01M4/58H01M10/0525
CPCC01B25/45C01P2002/72C01P2004/03C01P2006/40H01M4/5825H01M10/0525Y02E60/10
Inventor 不公告发明人
Owner WUHU ZHANGHONG ENG TECH CO LTD
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