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Carbon-coated lithium iron phosphate positive electrode material, preparation method thereof and lithium ion battery

A technology of carbon-coated lithium iron phosphate and positive electrode materials, which is applied to battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor conductivity, low energy density, and uneven carbon layer coating, so as to reduce the generation of impurities, Small particles, effect of inhibiting grain growth

Pending Publication Date: 2022-04-12
SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

[0006] The main purpose of the present invention is to provide a carbon-coated lithium iron phosphate positive electrode material, its preparation method and lithium ion battery, so as to solve the problem of uneven coating of the carbon layer on the surface of the existing lithium iron phosphate positive electrode material, which leads to its poor conductivity and Problems with low energy density

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  • Carbon-coated lithium iron phosphate positive electrode material, preparation method thereof and lithium ion battery
  • Carbon-coated lithium iron phosphate positive electrode material, preparation method thereof and lithium ion battery

Examples

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preparation example Construction

[0019] As described in the background art, the carbon layer coating on the surface of the existing lithium iron phosphate cathode material is not uniform, which leads to the problems of poor conductivity and low energy density. In order to solve the above technical problems, the present application provides a method for preparing a carbon-coated lithium iron phosphate positive electrode material. The preparation method for a carbon-coated lithium iron phosphate positive electrode material includes: under a first inert atmosphere, make a lithium source and ferrous The source and the first solvent are mixed for the first time to obtain the first raw material liquid; under the second inert atmosphere, the phosphorus source, the auxiliary agent and the second solvent are mixed for the second time to obtain the second raw material liquid, and the auxiliary agent is selected from gentiobiose and / or gentiotriose; the first raw material liquid and the second raw material liquid are sub...

Embodiment 1

[0037] The volume ratio of ethanol to water is 1:3 to prepare mixed solvent A; according to Li:Fe:P molar ratio is 2:1:1, weigh lithium source, iron source and phosphorus source for batching, and the solution mixing process is under nitrogen protection atmosphere next.

[0038] First take a certain amount of lithium hydroxide and dissolve it in solvent A to make solution B, the pH is 5, then weigh ferrous sulfate in proportion and dissolve it in solvent A to make solution C, the pH is 5; Slowly add solution C to solution B to form the first raw material solution.

[0039] Take phosphoric acid and gentiobiose in proportion and be dissolved in solvent A to make the second raw material liquid, the mol ratio of lithium hydroxide, ferrous sulfate, phosphoric acid and gentiobiose in the solution is 2:1:1:0.012, And the concentration of gentiobiose under this ratio is 0.12mol / L.

[0040] After mixing the first raw material liquid and the second raw material liquid under the state o...

Embodiment 2

[0043] The difference from Example 1 is: using gentiotriose to replace gentiobiose.

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Abstract

The invention provides a carbon-coated lithium iron phosphate positive electrode material, a preparation method thereof and a lithium ion battery. The preparation method of the carbon-coated lithium iron phosphate positive electrode material comprises the following steps: in a first inert atmosphere, mixing a lithium source, a ferrous source and a first solvent for the first time to obtain a first raw material solution; under a second inert atmosphere, the phosphorus source, an auxiliary agent and a second solvent are mixed for the second time, a second raw material solution is obtained, and the auxiliary agent is selected from gentiobiose and / or gentiobiose; carrying out hydrothermal synthesis reaction on the first raw material solution and the second raw material solution to obtain lithium iron phosphate containing a carbon amorphous coating layer; and sintering the lithium iron phosphate containing the carbon amorphous coating layer in a third inert atmosphere to obtain the carbon-coated lithium iron phosphate positive electrode material. By adopting the method, the uniformity of the carbon coating layer in the positive electrode material can be greatly improved, so that the conductivity and the energy density of the positive electrode material can be greatly improved.

Description

technical field [0001] The invention relates to the field of lithium ion battery manufacturing, in particular to a carbon-coated lithium iron phosphate cathode material, a preparation method thereof and a lithium ion battery. Background technique [0002] Ternary materials have high power density, but their cost is high and it is difficult to promote them in the market. Lithium iron phosphate (LiFePO 4 ) cathode material has become one of the important technical directions for the main material of hybrid vehicle battery cathode due to its low cost, high safety, high cycle performance and high energy density. But LiFePO 4 There are fundamental defects in the material that cannot be ignored, such as poor electrical conductivity, which greatly limits its application in HEV (hybrid electric) new energy vehicles, so it is necessary to modify the existing LiFePO 4 The material is modified. [0003] In order to solve the above key problems, academia and industry mainly improve ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCY02E60/10
Inventor 胡燚陈巍欧阳云鹏
Owner SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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