Lithium iron phosphate composite positive electrode sheet and preparation method thereof

A technology of lithium iron phosphate and composite positive electrodes, which is applied in the direction of phosphate, phosphorus oxyacids, phosphorus compounds, etc., can solve the problems of low electrolyte permeability, affecting cycle performance, and high density of aluminum materials, and achieves improved liquid absorption and retention Liquid capacity, good cycle performance, and the effect of increasing the contact area

Active Publication Date: 2020-06-09
HEBEI LITAO BATTERY MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, Chinese patent 201510258029.4 discloses a method for preparing a high-rate lithium iron phosphate positive electrode material and a battery positive electrode sheet. The electroless plating of aluminum on the surface of the aluminum electrode sheet and the coating of graphene on the surface improve the conductivity of the electrode sheet. However, this The electroplating method used in the method makes the aluminum material deposited on the pole piece dense, resulting in low electrolyte permeability, thus affecting the cycle performance

Method used

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  • Lithium iron phosphate composite positive electrode sheet and preparation method thereof
  • Lithium iron phosphate composite positive electrode sheet and preparation method thereof
  • Lithium iron phosphate composite positive electrode sheet and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] This example relates to the preparation of a lithium iron phosphate composite positive electrode sheet.

Embodiment 11

[0027] Prepare lithium iron phosphate composite positive pole sheet according to the following steps:

[0028] a. Preparation of lithium iron phosphate pole piece:

[0029] Configure lithium iron phosphate slurry, take 93g of lithium iron phosphate, 1.5g of carbon nanotubes, and 5.5g of polyvinylidene fluoride, add them to 150g of N-methylpyrrolidone, and disperse them evenly in a mixer, then vacuumize and remove foam to obtain iron phosphate Lithium slurry; the lithium iron phosphate slurry is coated on the foamed aluminum current collector (the thickness of the foamed aluminum is 20 μm, and the porosity is 90%) by a coating machine, double-sided coating, the thickness of both sides is 200 μm, after drying Rolling under a pressure of 20Mpa to obtain a lithium iron phosphate pole piece;

[0030] b. Preparation of lithium iron phosphate composite positive electrode sheet:

[0031] Take 17g (0.1mol) of silver nitrate, add it to 1000ml deionized water, configure a silver nitrat...

Embodiment 12

[0033] Prepare lithium iron phosphate composite positive pole sheet according to the following steps:

[0034] a. Preparation of lithium iron phosphate pole piece:

[0035] Configure lithium iron phosphate slurry, take 90g of lithium iron phosphate, 2g of carbon nanotubes, and 5g of polyvinylidene fluoride, add them to 150g of N-methylpyrrolidone, disperse evenly in a mixer, and then vacuumize to remove bubbles to obtain lithium iron phosphate Slurry: the lithium iron phosphate slurry is coated on the foamed nickel current collector (the thickness of the foamed aluminum is 15 μ m, and the porosity is 80%) by a coating machine, double-sided coating, the double-sided thickness is 200 μ m, after drying Rolling under a pressure of 20Mpa to obtain lithium iron phosphate pole pieces;

[0036] b. Preparation of lithium iron phosphate composite positive electrode sheet:

[0037] Take 17g (0.1mol) of silver nitrate, add it to 5000ml deionized water, configure a silver nitrate solutio...

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Abstract

The invention discloses a preparation method of a lithium iron phosphate composite positive electrode plate. According to the method, foamy metal is taken as a current collector, and the surface of the current collector is coated with lithium iron phosphate, and then pressing is performed to obtain a lithium iron phosphate electrode plate; and next, deposition is performed on the surface of lithium iron phosphate through a silver mirror reaction to form a metal elementary silver coated layer to prepare the layer-structured lithium iron phosphate composite positive electrode plate. By virtue ofthe internal foamy metal current collector in the electrode plate, the contact area with an active material can be enlarged, the internal resistance is lowered, and adhesiveness is improved; and meanwhile, by virtue of the external high-conductivity elementary silver, the conductivity of the electrode plate is improved, the occurrence probability of a secondary reaction is lowered, the conductivity and the heat dissipation performance of the lithium iron phosphate electrode plate are improved, and the prepared lithium iron phosphate battery has the characteristics of high rate capability, excellent heat dissipation performance, high cycle performance, high safety performance and the like.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery materials, in particular to a method for preparing a lithium iron phosphate composite positive electrode, and a lithium iron phosphate composite positive electrode sheet obtained by the preparation method. Background technique [0002] Lithium iron phosphate (LiFePO 4 ) is considered to be a new lithium-ion battery cathode material with broad application prospects because of its abundant raw material sources, low price, good thermal stability, and excellent cycle performance, which can be applied to power batteries or energy storage batteries. [0003] With the popularization of electric vehicles and the demand for fast battery charging technology, lithium-ion batteries are required to have a higher rate performance in order to meet the development of electric vehicles, power tools and other fields. However, due to the olivine structure of lithium iron phosphate, compared with the lay...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M10/0525H01M4/1397H01M4/136C01B25/26C01B25/45C01B25/37
CPCC01B25/26C01B25/375C01B25/45H01M4/136H01M4/1397H01M4/5825H01M10/0525Y02E60/10
Inventor 张贵贞周立森
Owner HEBEI LITAO BATTERY MATERIAL
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