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Composite positive pole piece as well as preparation method and application thereof

A composite cathode and cathode technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of low voltage and energy density, poor conductivity, poor conductivity of lithium manganese iron phosphate, etc. Low temperature performance, the effect of improving energy density

Pending Publication Date: 2022-01-11
ZHEJIANG NARADA POWER SOURCE CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the shortcomings of the poor conductivity of the lithium manganese iron phosphate material in the prior art, which affects the application of lithium ion batteries, and provides a composite positive pole piece and its preparation method and application. The composite positive pole piece can improve The defect of poor conductivity of lithium manganese iron phosphate solves the problem of LiFePO 4 The problem of low platform voltage and energy density can improve the high temperature cycle capability, or it can greatly improve LiNi x co y mn z o 2 Safety performance of ternary material battery

Method used

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  • Composite positive pole piece as well as preparation method and application thereof
  • Composite positive pole piece as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The preparation method of the composite positive pole piece comprises:

[0040] S1. LiFePO 4 Preparation of slurry

[0041] 9.35g LiFePO 4 After the powder, 0.4g of conductive agent, and 0.25g of binder are mixed evenly, slowly add 12mL of NMP solvent into the mixed powder, stir rapidly at a speed of 750r / min to fully react for 45min, and obtain a stable and uniform black LiFePO 4 slurry.

[0042] S2. LiFePO 4 Preparation of base

[0043] The prepared LiFePO 4 The slurry is uniformly coated on the current collector of the positive electrode, and then dried in an oven at 100°C to form LiFePO 4 grassroots.

[0044] S3. LiFe 0.5 mn 0.5 PO 4 Preparation of slurry

[0045] 9g LiFe 0.5 mn 0.5 PO 4 After the powder, 0.4g of conductive agent, and 0.25g of binder are mixed evenly, slowly add 12mL of NMP solvent into the mixed powder, stir rapidly at a speed of 750r / min to fully react for 45min, and obtain a stable and uniform black LiFe 0.5 mn 0.5 PO 4 slurry. ...

Embodiment 2

[0053] The preparation method of the composite positive pole piece comprises:

[0054] S1. LiFePO 4 Preparation of slurry

[0055] 46.5Kg LiFePO 4 After the powder, 2Kg conductive agent, and 1.5Kg binder are mixed evenly, slowly add NMP solvent into the mixed powder, and after dispersion, a stable and uniform black LiFePO is obtained. 4 The slurry has a viscosity of 5000mPa·s and a solid content of 50%.

[0056] S2. LiFePO 4 Preparation of base

[0057] The prepared LiFePO 4 The slurry is evenly coated on the current collector, and then dried in an oven at 150°C to form LiFePO 4 grassroots.

[0058] S3. LiFe 0.4 mn 0.6 PO4 Preparation of slurry

[0059] 46.5Kg LiFe 0.5 mn 0.5 PO 4 After the powder, 2Kg conductive agent, and 1.5Kg binder are mixed evenly, slowly add NMP solvent into the mixed powder, and after dispersion, a black stable and uniform LiFe 0.4 mn 0.6 PO 4 The slurry has a viscosity of 10000mPa·s and a solid content of 68%.

[0060] S4. LiFe 0.4 m...

Embodiment 3

[0067] The preparation method of the composite positive pole piece comprises:

[0068] S1. LiNi x co y mn z o 2 Preparation of slurry

[0069] 96Kg LiNi x co y mn z o 2 After the powder, 2Kg conductive agent, and 2Kg binder are mixed evenly, slowly add NMP solvent into the mixed powder, and after dispersion, black stable and uniform LiNi is obtained x co y mn z o 2 slurry.

[0070] S2. LiNi x co y mn z o 2 Preparation of base

[0071] The prepared LiNi x co y mn z o 2 The slurry is evenly coated on the current collector, and the coating surface density is 185g / m 2 , and then dried in an oven to form LiNi x co y mn z o 2 grassroots.

[0072] S3. LiFe 0.5 mn 0.5 PO 4 Preparation of slurry

[0073] 96Kg LiFe 0.5 mn 0.5 PO 4 After the powder, 2Kg conductive agent, and 2Kg binder are mixed evenly, slowly add NMP solvent into the mixed powder, and after dispersion, a black stable and uniform LiFe 0.5 mn 0.5 PO 4 slurry.

[0074] S4. LiFe 0.5 mn ...

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Abstract

The invention relates to a battery technology, and discloses a composite positive pole piece as well as a preparation method and application thereof. The preparation method comprises: preparation of positive base layer slurry, preparation of a positive base layer, preparation of active slurry, preparation of an active layer, rolling and slicing treatment. The invention further discloses the composite positive pole piece. The composite positive pole piece comprises a current collector, a positive base layer coated on the surface of the current collector, and an active layer coated on the surface of the positive base layer; and the invention also discloses a lithium ion battery with the composite positive pole piece. According to the invention, the LiFe0.5Mn0.5PO4 or LiFe0.4Mn0.6PO4 or LiFe0.3Mn0.7PO4 material with poor conductivity is compounded with the positive electrode base material with excellent conductivity, so that the battery matched with the composite positive electrode material has the advantages of high energy density, long cycle life, high safety and low cost, and the advantages of complementing each other and generating a synergistic effect; and finally, the performances of the battery in all aspects are more balanced, and the blank in the aspect in the market is filled.

Description

technical field [0001] The invention relates to battery technology, in particular to a composite LiFe 0.5 mn 0.5 PO 4 or LiFe 0.4 mn 0.6 PO 4 or LiFe 0.3 mn 0.7 PO 4 Composite positive electrode sheet made of material, its preparation method and application. Background technique [0002] At present, the governments of various countries are vigorously promoting the development of the new energy industry, and the application of lithium-ion batteries in power, energy storage, and communication is becoming more and more extensive. [0003] Lithium-ion battery cathode material is the key link of current lithium battery technology. At present, the mass production mainly includes lithium iron phosphate material, which has the advantages of low cost, environmental friendliness, long cycle life, good safety performance, and abundant raw materials. However, compared with Li + The electrode potential of / Li is only 3.4V, and the energy density is relatively low, which will gre...

Claims

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Application Information

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IPC IPC(8): H01M4/1397H01M4/136H01M4/505H01M4/525H01M10/0525
CPCH01M4/1397H01M4/136H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 马静王盈来蒋勤虚李艳红李静方玲黄文徐留扣郭锋相佳媛
Owner ZHEJIANG NARADA POWER SOURCE CO LTD
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