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Lithium iron phosphate and its preparation method and application

A lithium iron phosphate and lithium source technology, applied in chemical instruments and methods, phosphorus compounds, nanotechnology for materials and surface science, etc., can solve the problem of impurity in sintering costs, uneven mixing of raw materials, loss of material properties, etc. problem, to achieve the effects of fast ammonia drop rate, guaranteed reaction rate, and increased nucleation number

Active Publication Date: 2022-04-26
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, in the preparation process of conventional lithium iron phosphate cathode materials, large energy consumption is generated due to stirring and ball milling; at the same time, there is uneven mixing of raw materials in the process of conventional solid-state synthesis of lithium iron phosphate, which leads to impure sintering costs of materials, resulting in material Therefore, it is particularly important to continuously optimize the synthesis process and improve the cost performance of lithium iron phosphate materials

Method used

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  • Lithium iron phosphate and its preparation method and application
  • Lithium iron phosphate and its preparation method and application
  • Lithium iron phosphate and its preparation method and application

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Embodiment 1

[0058] This embodiment provides a preparation method of lithium iron phosphate, the preparation method comprising:

[0059] 1, the particle diameter is added in the emulsifier solution that is formed by sodium lauryl sulfate and polyoxyethylene alkylphenol ether after vacuum-drying the nano lithium carbonate of 400nm, keeps stirring; Then add butyl acrylate and divinylbenzene ( The two are used as the first initiator), the free radical is used to initiate the first polymerization reaction, the temperature of the first polymerization reaction is 70° C., and the time is 4 hours to obtain the intermediate product A.

[0060] Wherein, the ratio of emulsifying agent and lithium carbonate mol ratio is 0.5:1; The mass ratio of sodium lauryl sulfate and polyoxyethylene alkylphenol ether is 1.5:1, and the mol ratio of divinylbenzene in the first initiator is 5%, the mol ratio of the first initiator and lithium carbonate is 0.5:1.

[0061] 2. Prepare a mixed solution of methyl methacry...

Embodiment 2

[0068] This embodiment provides a preparation method of lithium iron phosphate, the preparation method comprising:

[0069] 1, the particle diameter is added in the emulsifier solution that is formed by sodium lauryl sulfate and polyoxyethylene alkylphenol ether after vacuum-drying the nano lithium carbonate of 400nm, keeps stirring; Then add butyl acrylate and divinylbenzene ( The two are used as the first initiator), the free radical is used to initiate the first polymerization reaction, the temperature of the first polymerization reaction is 70° C., and the time is 4 hours to obtain the intermediate product A.

[0070] Wherein, the molar ratio of emulsifier to lithium carbonate is 0.5:1. The mass ratio of sodium lauryl sulfate and polyoxyethylene alkylphenol ether is 1.5:1, and the mol ratio of divinylbenzene in the first initiator is 5%, and the mol ratio of the first initiator and lithium carbonate is 0.6: 1.

[0071] 2. Prepare a mixed solution of methyl methacrylate, ...

Embodiment 3

[0078] This embodiment provides a preparation method of lithium iron phosphate, the preparation method comprising:

[0079] 1. After vacuum-drying the nano-lithium carbonate with a particle diameter of 300nm, add in the emulsifier solution formed by sodium lauryl sulfate and polyoxyethylene alkylphenol ether, keep stirring; then add butyl acrylate and divinylbenzene ( The two are used as the first initiator), and the free radical is used to initiate the first polymerization reaction. The temperature of the first polymerization reaction is 60° C. and the time is 2 hours, and the intermediate product A is obtained.

[0080] Wherein, the mol ratio of emulsifier and lithium carbonate is 0.5:1. The mass ratio of sodium lauryl sulfate and polyoxyethylene alkylphenol ether is 1:1, and the mol ratio of divinylbenzene in the first initiator is 5%, and the mol ratio of the first initiator and lithium carbonate is 0.6: 1.

[0081] 2. Prepare a mixed solution of methyl methacrylate, div...

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Abstract

The invention provides lithium iron phosphate and its preparation method and application. The preparation method includes: dispersing the lithium source with an emulsifier, and then adding a first initiator to carry out the first polymerization reaction to obtain an intermediate product A; adding a mixed solution of methyl methacrylate, a cross-linking agent and a second initiator to the intermediate In the product A, the second polymerization reaction is carried out to obtain the intermediate product B; the intermediate product B, oxidant, iron source, and phosphorus source are mixed for the third reaction to obtain the intermediate product C; the intermediate product C is dispersed with glucose solution, dried, and calcined , to obtain the lithium iron phosphate. The present invention also provides the lithium iron phosphate obtained by the above preparation method. The present invention further provides a positive electrode material, which includes the above-mentioned lithium iron phosphate. The above-mentioned preparation method can directly obtain nano-scale lithium iron phosphate, and reduce crushing and other processes and energy consumption in the manufacturing process. The above-mentioned lithium iron phosphate has uniform distribution of elements, and it has good charge and discharge properties when used as an electrode positive electrode material.

Description

technical field [0001] The invention relates to the technical field of battery anode material manufacturing, in particular to lithium iron phosphate and its preparation method and application. Background technique [0002] As human society attaches more importance to energy and environmental protection issues, lithium-ion batteries have developed rapidly in recent years and have been widely used in mobile phones, computers, new energy vehicles and energy storage fields. Especially driven by the explosive growth of the new energy vehicle market, the rapid development of lithium batteries has led to increasingly fierce competition in the industry, and the gradual rise of local battery giants. Downstream new energy vehicles have entered the growth period from the introduction period. Factors such as subsidy decline and technical performance requirements have intensified the survival of the fittest in the battery industry, and the market concentration has increased. In such a h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M10/0525C01B25/45B82Y30/00B82Y40/00
CPCH01M4/5825H01M10/0525C01B25/45B82Y40/00B82Y30/00Y02E60/10C01P2004/03C01P2006/40H01M2004/028
Inventor 汪伟伟姚丹杨茂萍刘兴亮张二冬
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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