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Composite positive pole piece for lithium ion battery, preparation method of composite positive pole piece and lithium ion battery

A technology of lithium ion battery and positive pole piece, which is applied in battery electrodes, electrode carriers/current collectors, secondary batteries, etc., can solve the problems of low workshop humidity requirements, corrosion of stainless steel rollers and their knife edges, and increased cost, and achieves Improve the first efficiency and magnification, improve the liquid absorption and retention capacity, and overcome the effect of low tap density

Active Publication Date: 2017-11-03
惠州博磊达新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high reactivity of lithium element and water, there are potential safety hazards during use, and high process requirements must be met in the production process, such as low humidity requirements in the workshop, high hardness of the pole piece, and low porosity of the pole piece. It is difficult to industrialize the process, and at the same time, it is easy to cause corrosion of the stainless steel roller and its knife edge during the rolling process of the lithium supplementary pole piece, resulting in an increase in its cost and greater difficulty in the process

Method used

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  • Composite positive pole piece for lithium ion battery, preparation method of composite positive pole piece and lithium ion battery
  • Composite positive pole piece for lithium ion battery, preparation method of composite positive pole piece and lithium ion battery
  • Composite positive pole piece for lithium ion battery, preparation method of composite positive pole piece and lithium ion battery

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Effect test

Embodiment 1

[0027] A lithium-ion battery cathode composite pole piece, which has a layered structure, including an inner layer, an intermediate layer and an outer layer, the inner layer is a mesh aluminum foil current collector, the middle layer is a positive electrode active material layer, and the material of the positive electrode active material is ternary Cathode material (Li(Ni 0.5 co 0.3 mn 0.2 )O 2 ), the outer layer is a sprayed layer, and the thickness ratio of the inner layer, the middle layer and the sprayed layer is 25:200:3.

[0028] The preparation method of the lithium-ion battery cathode composite pole piece specifically comprises the following steps:

[0029] S1. Preparation of spraying liquid: First, weigh 3g of polyvinylidene fluoride and add it to 200g of N-methylpyrrolidone, then add 3g of carbon nanotubes after even dispersion, and then add 94g of lithium hexafluoroaluminate , after high-speed dispersion and uniform spraying liquid with a viscosity of 1500mpa•S;...

Embodiment 2

[0034] A lithium-ion battery cathode composite pole piece, which has a layered structure, including an inner layer, an intermediate layer and an outer layer, the inner layer is a mesh aluminum foil current collector, the middle layer is a positive electrode active material layer, and the material of the positive electrode active material is ternary Cathode material (Li(Ni 0.5 co 0.3 mn 0.2 )O 2 ), the outer layer is a sprayed layer, and the thickness ratio of the inner layer, the middle layer and the sprayed layer is 15:100:1.

[0035] The preparation method of the lithium-ion battery cathode composite pole piece specifically comprises the following steps:

[0036] S1. Preparation of spraying liquid: First, weigh 5g of polyvinylidene fluoride and add it to 200g of N-methylpyrrolidone, then add 1g of carbon nanotubes after even dispersion, and then add 94g of lithium hexafluoroaluminate , after high-speed dispersion and uniform spraying liquid with a viscosity of 1000mpa•S; ...

Embodiment 3

[0041] A lithium-ion battery cathode composite pole piece, which has a layered structure, including an inner layer, an intermediate layer and an outer layer, the inner layer is a mesh aluminum foil current collector, the middle layer is a positive electrode active material layer, and the material of the positive electrode active material is ternary Cathode material (Li(Ni 0.5 co 0.3 mn 0.2 )O 2 ), the outer layer is a sprayed layer, and the thickness ratio of the inner layer, the middle layer and the sprayed layer is 30:250:5.

[0042] The preparation method of the lithium-ion battery cathode composite pole piece specifically comprises the following steps:

[0043] S1. Preparation of spraying liquid: First, weigh 1g of polyvinylidene fluoride and add it to 200g of N-methylpyrrolidone, then add 5g of carbon nanotubes after even dispersion, and then add 94g of lithium hexafluoroaluminate , after high-speed dispersion and uniform spraying liquid with a viscosity of 2000mpa•S;...

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Abstract

The invention provides a composite positive pole piece for a lithium ion battery, a preparation method of the composite positive pole piece and the lithium ion battery. The composite positive pole piece for the lithium ion battery is of a laminated structure, and comprises an inner layer, a middle layer and an outer layer, wherein the inner layer is a current collector, the middle layer is a positive active substance layer, and the outer layer is a spraying layer. Trilithium hexafluoroaluminate is contained in the spraying layer of the composite positive pole piece, the spraying layer is sprayed on the surface of the pole piece, the purpose that lithium ions are supplemented by the pole piece is reached, and sufficient lithium ions are provided for high-rate charging and discharging process and long cycle process of the lithium ion battery. In the preparation method of the composite positive pole piece for the lithium ion battery provided by the invention, the porosity and adhesive power of the pole piece are improved through a liquid nitrogen and microwave method, the flexibility and adhesive force of the pole piece are improved through a hot rolling technology, and the rebounding rate of the pole piece is reduced.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a lithium-ion battery cathode composite pole piece, a preparation method and a lithium-ion battery. Background technique [0002] Lithium-ion batteries are widely used in electric vehicles, digital electronics and other fields due to their high voltage, high energy density, long cycle life, and environmental friendliness. However, with the miniaturization of portable electronic devices, the development of long standby time, and the use of high-power and high-energy devices such as electric vehicles and energy storage components, higher and higher requirements are placed on the performance of lithium-ion batteries, especially the requirements Lithium-ion batteries have higher energy density and safety features, as well as the ability to charge and discharge quickly. [0003] During the first charging process of a lithium-ion battery, due to the formation of a solid ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/485H01M10/0525
CPCH01M4/485H01M4/667H01M10/0525Y02E60/10
Inventor 王燕原东甲薛历兴李志
Owner 惠州博磊达新能源科技有限公司
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