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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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 pr

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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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[0019] As described in the background art, the carbon layer on the surface of the existing lithium iron phosphate positive electrode material is not uniform, which in turn leads to the problems of poor electrical conductivity and low energy density. In order to solve the above technical problems, the present application provides a preparation method of a carbon-coated lithium iron phosphate positive electrode material, and the preparation method of a carbon-coated lithium iron phosphate positive electrode material includes: in a first inert atmosphere, a lithium source and a ferrous iron 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; make the first raw material liquid and the seco...

Example Embodiment

[0036] Example 1

[0037] The mixed solvent A is prepared according to the volume ratio of ethanol to water as 1:3; the lithium source, iron source and phosphorus source are weighed according to the molar ratio of Li:Fe:P as 2:1:1, and the solution mixing process is carried out in a nitrogen protective atmosphere. proceed below.

[0038] First weigh a certain amount of lithium hydroxide and dissolve it in solvent A to prepare solution B, the pH is 5, and then weigh ferrous sulfate in proportion to dissolve in solvent A to prepare solution C, pH is 5; under mechanical stirring The solution C was slowly added to the solution B to form the first stock solution.

[0039] Phosphoric acid and gentiobiose were weighed in proportion and dissolved in solvent A to prepare a second raw material solution. The molar ratio of lithium hydroxide, ferrous sulfate, phosphoric acid and gentiobiose in the solution was 2:1:1:0.012, And the concentration of gentiobiose in this ratio is 0.12mol / L....

Example Embodiment

[0042] Example 2

[0043] The difference from Example 1 is that gentiobiose is replaced by gentiotriose.

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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 ...

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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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