Preparation method and application of positive electrode material lithium iron phosphate

A technology of lithium iron phosphate and positive electrode material, applied in the direction of positive electrode, battery electrode, active material electrode, etc., can solve the problem of high raw material price, and achieve the effect of reducing preparation cost, long cycle life and high capacity density

Inactive Publication Date: 2021-05-28
SHENHUA ZHUNNENG RESOURCE COMPREHENSIVE DEV COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although lithium iron phosphate prepared with iron phosphate as an iron source has excellent electrical properties, the price of raw materials is high

Method used

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  • Preparation method and application of positive electrode material lithium iron phosphate
  • Preparation method and application of positive electrode material lithium iron phosphate
  • Preparation method and application of positive electrode material lithium iron phosphate

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0045] The phosphoric acid aqueous solution that adopts in this embodiment is that mass concentration is 50%, and lithium source, iron source adopt lithium carbonate and iron oxide that the following method makes respectively;

[0046] The preparation method of lithium carbonate is as follows: it is obtained by using the "one-step acid dissolution method" of fly ash to produce alumina, which is obtained from the remaining evaporated scale mother liquor in the evaporation and crystallization process, specifically:

[0047] Step1. Calcining the above-mentioned evaporated scale mother liquor at 500°C to obtain a calcined product;

[0048] Step2. Leach the calcined product in the secondary evaporation condensed water in the "one-step acid dissolution method" fly ash preparation alumina process, and then filter to obtain lithium-containing solution a; wherein, the mass ratio of the calcined product to the leachate is 1:1;

[0049] Step3. Mix the lithium-containing solution a with ...

Embodiment 2

[0065] The difference between this embodiment and Example 1 is that the composition of the steamed scale mother liquor used in the lithium carbonate preparation process and the iron element enrichment solution used in the iron oxide preparation process is different, as follows:

[0066] In the step of preparing lithium carbonate, the content of lithium ion in solution f is 4598mg / L, the content of calcium ion is 11mg / L, the content of magnesium ion is 57mg / L, the content of sodium ion is 25mg / L, the content of potassium ion The content is 0.8mg / L, and the content of aluminum ion is 0.6mg / L;

[0067] The content of iron ions in the iron enrichment solution is 198767mg / L, the content of sodium ions is 4.7mg / L, the content of aluminum ions is 1.9mg / L, the content of titanium ions is 0.85mg / L, and the content of silicon ions is 79mg / L.

[0068] The lithium iron phosphate prepared in this example is assembled with lithium metal to test the 2025 battery, and the charge and dischar...

Embodiment 3

[0070] The difference between this embodiment and Example 1 is that the composition of the steamed scale mother liquor used in the lithium carbonate preparation process and the iron element enrichment solution used in the iron oxide preparation process is different, as follows:

[0071] In the step of preparing lithium carbonate, the content of lithium ion in the solution f is 1323mg / L, the content of calcium ion is 34mg / L, the content of magnesium ion is 23mg / L, the content of sodium ion is 24mg / L, the content of potassium ion The content is 0.5mg / L, and the content of aluminum ion is 0.2mg / L;

[0072] The content of iron ions in the iron enrichment solution is 100672mg / L, the content of sodium ions is 0.7mg / L, the content of aluminum ions is 0.7mg / L, the content of titanium ions is 0.01mg / L, and the content of silicon ions is 13mg / L.

[0073] The lithium iron phosphate prepared in this example is assembled with lithium metal to test the 2025 battery, and the charge and dis...

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Abstract

The invention provides a preparation method of a positive electrode material lithium iron phosphate. The preparation method comprises the following steps of: (1) mixing a lithium source, an iron source and a phosphoric acid aqueous solution to form a mixed solution, and stirring the mixed solution to prepare sol; (2) under heating and stirring, completely volatilizing the solvent from the sol to obtain wet gel, and carrying out vacuum drying on the wet gel to obtain dry gel; and (3) grinding the dry gel to obtain a powdery precursor, and carrying out heat treatment on the powdery precursor in a reducing atmosphere to obtain the lithium iron phosphate. The invention also provides a lithium ion battery. The lithium ion battery comprises a positive electrode plate, a negative electrode plate, electrolyte and a diaphragm; and the positive electrode plate comprises the positive electrode material lithium iron phosphate prepared by the preparation method. According to the method disclosed by the invention, the industrial preparation cost of the lithium iron phosphate is reduced, and the prepared lithium iron phosphate has good electrochemical performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery cathode materials, in particular to a preparation method and application of fly ash to prepare lithium iron phosphate cathode materials. Background technique [0002] At present, new energy electric vehicles are the key development direction of the country, and power batteries are its main components. The lithium-ion battery industry is showing steady and rapid growth, and its cathode materials will also usher in unprecedented development opportunities. Lithium iron phosphate has the advantages of stable charging and discharging voltage platform, long cycle life, low price, and environmental friendliness. It is considered to be one of the most potential cathode materials for lithium-ion power batteries. Cathode materials account for about 30% of the cost of the entire single battery. Reducing the cost of cathode materials such as lithium iron phosphate is the key to the development of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/0525
CPCH01M4/5825H01M10/0525H01M2004/028Y02E60/10
Inventor 徐靓王永旺许立军李超贾秀丽杨磊李世春张云峰
Owner SHENHUA ZHUNNENG RESOURCE COMPREHENSIVE DEV COMPANY
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