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Lithium battery electrode plate and manufacturing method therefor

A lithium battery and pole piece technology is applied in the field of lithium battery pole pieces and their production, which can solve the problem of low safety of large-capacity lithium batteries, and achieve the effect of simple and easy coating process and favorable for mass production.

Active Publication Date: 2017-03-08
SHENZHEN BAK POWER BATTERY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose a lithium battery pole piece and its manufacturing method to solve the technical problem of low safety of large-capacity lithium batteries in the prior art

Method used

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  • Lithium battery electrode plate and manufacturing method therefor

Examples

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Embodiment 1

[0038] This embodiment proposes a manufacturing method of a lithium battery pole piece, comprising steps:

[0039] S1. Prepare positive electrode inner layer slurry, positive electrode outer layer slurry, negative electrode inner layer slurry and negative electrode outer layer slurry;

[0040] S2. Add the positive electrode inner layer slurry, the positive electrode outer layer slurry, the negative electrode inner layer slurry and the negative electrode outer layer slurry into different slurry tanks of the Slot Die coater for coating to obtain a double-layer coating structure. Lithium battery pole piece.

[0041] Wherein, the preparation of positive electrode inner layer slurry comprises:

[0042]S11a, mixing 5.5 g of polyvinylidene fluoride with 30 g of NMP solvent, and stirring for 1 to 3 hours to prepare a glue solution that is uniformly mixed and has a solid content of 15.5%;

[0043] S11b. Mix 97.5g of lithium iron phosphate and 1.0g of VGCF dry powder evenly, add the a...

Embodiment 2

[0056] This example proposes a method for manufacturing a lithium battery pole piece. The difference from Example 1 lies in the preparation of the positive electrode inner layer slurry, the positive electrode outer layer slurry, the negative electrode inner layer slurry, and the negative electrode outer layer slurry. in,

[0057] Preparation of positive electrode inner layer slurry:

[0058] S11a. Mix 6.5g of polyvinylidene fluoride with 30g of NMP solvent, and stir for 1-3 hours to prepare a glue solution that is uniformly mixed and has a solid content of 17.8%;

[0059] S11b. Mix 98g of nickel-cobalt-manganese ternary material and 1.0g of VGCF dry powder evenly, then add the above glue and mix evenly, and use NMP to adjust the solid content of the slurry to 70%-75%.

[0060] Preparation of positive electrode outer layer slurry:

[0061] S12a. Mix 1.05g of polyvinylidene fluoride with 30g of NMP solvent, and stir for 1-3 hours to prepare a glue solution that is uniformly mi...

Embodiment 3

[0072] This example proposes a method for manufacturing a lithium battery pole piece. The difference from Example 1 lies in the preparation of the positive electrode inner layer slurry, the positive electrode outer layer slurry, the negative electrode inner layer slurry, and the negative electrode outer layer slurry. in,

[0073] Preparation of positive electrode inner layer slurry:

[0074] S11a. Mix 4.5g of polyvinylidene fluoride with 30g of NMP solvent, and stir for 1-3 hours to prepare a glue solution that is uniformly mixed and has a solid content of 13.0%;

[0075] S12b, 97.5g of nickel-cobalt-manganese ternary material LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 , 1.2g of SP dry powder was mixed evenly, then the above glue was added and mixed evenly, and the solid content of the slurry was adjusted to 70%-75% by using NMP.

[0076] Preparation of positive electrode outer layer slurry:

[0077] S12a. Mix 1.3g of polyvinylidene fluoride with 30g of NMP solvent, and stir for 1-3 hou...

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Abstract

The invention discloses a lithium battery electrode plate and a manufacturing method therefor. The lithium battery electrode plate comprises a positive electrode inner layer electrode plate and a positive electrode outer layer electrode plate, wherein the positive electrode inner layer electrode plate comprises a positive electrode inner layer active material; the positive electrode outer layer electrode plate comprises a positive electrode outer layer active material; the stability of the positive electrode inner layer active material is higher than that of the positive electrode outer layer active material, wherein the positive electrode inner layer active material comprises one or more of lithium iron phosphate, lithium cobalt oxide, a nickel-cobalt-manganese ternary material, a nickel-cobalt-aluminum high-nickel material and lithium titanate; and positive electrode outer layer active material comprises one or more of lithium iron phosphate, lithium cobalt oxide, the nickel-cobalt-manganese ternary material, the nickel-cobalt-aluminum high-nickel material and lithium titanate. The lithium battery electrode plate provided by the invention adopts a dual-layer electrode structure, so that relatively high safety performance can be obtained.

Description

technical field [0001] The invention relates to a lithium battery pole piece and a manufacturing method thereof. Background technique [0002] Lithium-ion batteries have outstanding advantages such as high energy density, long cycle life, and high energy conversion efficiency. They occupy a dominant position in mobile device power supplies and are also one of the most promising energy storage methods in applications such as electric vehicles and smart grids. These application areas have increasingly higher requirements on the energy density and individual battery capacity of lithium-ion batteries. The lithium-ion battery used in notebook computers has increased from a single capacity of about 2Ah to the current 3-4Ah; while the capacity of a single cell in car batteries and energy storage batteries has reached the level of tens of Ah or even two to three hundred Ah. Because lithium-ion batteries use flammable organic solvents as electrolyte solvents, there are potential saf...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/131H01M4/136H01M4/505H01M4/525H01M4/58H01M4/62H01M10/0525
CPCH01M4/0404H01M4/131H01M4/136H01M4/505H01M4/525H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 安伟峰骆兆军林建陈辉宋华杰柳青
Owner SHENZHEN BAK POWER BATTERY CO LTD
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