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Carbon fiber modified positive pole lithium iron phosphate material for lithium ion battery, positive pole, lithium battery and preparation method

A technology of lithium-ion batteries and lithium iron phosphate, which is applied in the field of nanomaterials, can solve the problems of difficulty in the modification process of lithium iron phosphate, high equipment requirements, and complicated processes, etc., to achieve growth inhibition and agglomeration, low equipment requirements, and modification The effect of simple process

Inactive Publication Date: 2017-06-27
ZHEJIANG NARADA POWER SOURCE CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the disadvantages of the prior art that the modification process of lithium iron phosphate is difficult, the process is complex, and the equipment requirements are high, the invention provides a method for preparing a carbon fiber modified lithium iron phosphate positive electrode material for lithium ion batteries and the method obtained by applying the method. Lithium iron phosphate material, and lithium ion battery cathode and corresponding lithium ion battery made of the above lithium iron phosphate material

Method used

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  • Carbon fiber modified positive pole lithium iron phosphate material for lithium ion battery, positive pole, lithium battery and preparation method
  • Carbon fiber modified positive pole lithium iron phosphate material for lithium ion battery, positive pole, lithium battery and preparation method
  • Carbon fiber modified positive pole lithium iron phosphate material for lithium ion battery, positive pole, lithium battery and preparation method

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Embodiment 1

[0029] Freeze the cellulose. The frozen cellulose with a mass ratio of preferably 20% is added to the quantitative iron phosphate and lithium carbonate mixture. Put the mixed powder into a high-temperature carbonization furnace and raise the temperature to 800°C under the protection of N2. After keeping the temperature for 6 hours, cool it down to room temperature and take it out, which is the target lithium iron phosphate material.

Embodiment 2

[0031] The steps described in Example 1 above are different in that the cellulose is bacterial fiber BC.

Embodiment 3

[0033] As in the steps described in the above-mentioned embodiment 1 or 2, wherein the preparation step of lithium iron phosphate mixed with frozen cellulose comprises: after dissolving iron sulfate and ammonium phosphate, adjusting the pH value to be less than 4, preferably pH 1~ pH 3, after adding oxidant to react, filter and dry to obtain ferric phosphate for mixing with frozen cellulose.

[0034] Among them, optional iron sulfate salts include FeSO 4 or FeSO 4 ·7H 2 O, optional ammonium phosphate salts include (NH 4 ) 2 HPO 4 , (NH 4 ) 3 PO 4 , NH 4 h 2 PO 4 Or a mixture or hydrate of the above ammonium salts.

[0035] Oxidant can choose H 2 o 2 , or other oxidizing agents with similar strong oxidizing effects.

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Abstract

The invention belongs to the technical field of nanometer materials, relates to a method for manufacturing a lithium ion battery and discloses a method for preparing a carbon fiber modified positive pole lithium iron phosphate material for a lithium ion battery. The method comprises a freezing step of freezing cellulose; a mixing step of mixing the frozen cellulose with ferric phosphate and lithium carbonate; and a heating step of heating the mixed cellulose, ferric phosphate and lithium carbonate to obtain the lithium iron phosphate material for preparing a positive pole. The lithium iron phosphate material prepared by using the method, the battery positive pole made of the lithium iron phosphate material and the corresponding battery are further disclosed. The method for preparing the carbon fiber modified positive pole lithium iron phosphate material for the lithium ion battery has the advantages that the method for preparing the carbon fiber modified positive pole lithium iron phosphate material which can be used for the lithium ion battery and has good multiplying power and low-temperature performance is provided, and the method has high application value.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, relates to a method for manufacturing a lithium ion battery, in particular to a method for preparing a carbon fiber modified lithium ion battery anode lithium iron phosphate material, and also relates to the lithium iron phosphate material obtained by using the method, and using the lithium iron phosphate material Lithium ion battery cathode and lithium ion battery made of lithium iron phosphate material. Background technique [0002] Lithium iron phosphate material has the advantages of safety, good cycle performance, environmental friendliness, and low price. Together with ternary materials, it is the positive electrode material for power batteries and communication power supplies. However, compared with ternary materials, lithium iron phosphate materials have unsatisfactory rate performance and low-temperature performance due to their own low ion and electronic conductivity. Therefore, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525H01M4/136B82Y30/00
CPCB82Y30/00H01M4/136H01M4/364H01M4/5825H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 张芳平李小平郭峰周雷军杨孟瑶肖辉
Owner ZHEJIANG NARADA POWER SOURCE CO LTD