Porous electrode lithium-ion battery and preparation method thereof

A lithium-ion battery, porous electrode technology, applied in electrode manufacturing, secondary batteries, circuits, etc., can solve the problem that lithium-ion batteries are difficult to meet high energy density at the same time.

Active Publication Date: 2019-05-21
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In this way, it is still difficult for lithium-ion batteries to meet the requirements of high energy density, fast charging, high rate discharge and low temperature discharge at the same time.

Method used

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  • Porous electrode lithium-ion battery and preparation method thereof
  • Porous electrode lithium-ion battery and preparation method thereof

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Experimental program
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preparation example Construction

[0039] see figure 1 , in one embodiment, a kind of preparation method of porous electrode lithium-ion battery, comprises the following steps:

[0040] S110, providing an initial-bond positive electrode slurry.

[0041] It can be understood that the positive electrode sheet can be prepared by coating the positive electrode slurry on the positive electrode current collector and drying and cold pressing. The existing process usually coats the positive electrode slurry on the current collector at one time, but uses a higher viscosity Due to the low solvent content of the positive electrode slurry, the texture of the positive electrode slurry will be denser after drying and cold pressing, and the pores will be less, especially the positive electrode slurry close to the current collector is farther away from the electrolyte, so the ability to conduct lithium ions is weaker. Weak, when high-rate discharge or fast charging is required, the number of lithium ions attached to the surfa...

Embodiment 1

[0083] Provide an initial bond positive electrode slurry with a viscosity of 2500mPa·s;

[0084] Use 150g / m 2 The coated surface density of the first bonded positive electrode slurry is coated on the positive electrode current collector, and the drying operation is carried out, and the compacted density is 3.0g / cm 3 After cold pressing, a positive electrode slurry bottom layer is formed on the positive electrode current collector;

[0085] Carry out the first thickening operation on the initially bonded positive electrode slurry to obtain the first thickened positive electrode slurry with a viscosity of 3500mPa·s, perform the first coating operation on the positive electrode slurry for the bottom layer, and Performing a first drying operation on the positive electrode slurry base layer to form a first positive electrode slurry solid pore-forming layer on the positive electrode slurry base layer;

[0086] Carrying out a second thickening operation on the first thickened positiv...

Embodiment 2

[0094] Provide an initial bond positive electrode slurry with a viscosity of 3000mPa·s;

[0095] Use 200g / m 2 The coated surface density of the initial bonding positive electrode slurry is coated on the positive electrode current collector, and the drying operation is carried out, and the compacted density is 4.0g / cm 3 After cold pressing, a positive electrode slurry bottom layer is formed on the positive electrode current collector;

[0096] Carry out the first thickening operation on the initially bonded positive electrode slurry to obtain the first thickened positive electrode slurry with a viscosity of 4500mPa·s, perform the first coating operation on the positive electrode slurry for the bottom layer, and Performing a first drying operation on the positive electrode slurry base layer to form a first positive electrode slurry solid pore-forming layer on the positive electrode slurry base layer;

[0097] Carrying out a second thickening operation on the first thickened po...

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Abstract

The invention discloses a preparation method of a porous electrode lithium-ion battery. According to the method, a positive current collector is coated with initial-viscosity positive paste, a positive paste bottom building layer is formed after drying and cold-pressing, then the i(th) viscosity increasing operation is performed on the initial-viscosity positive paste to obtain the i(th) viscosity-increased positive paste, the i(th) positive paste middle-solidified pore-forming layer is formed after coating and drying, and a positive plate is obtained; a negative current collector is coated with initial-viscosity negative paste to form a negative paste bottom building layer, the k(th) viscosity increasing operation is performed on the initial-viscosity negative paste to obtain the k(th) viscosity-increased positive paste, the k(th) negative paste middle-solidified pore-forming layer is formed after coating and drying, and a negative plate is obtained; and the positive plate, a membraneand the negative plate are wound to obtain a cell, and the porous electrode lithium-ion battery is obtained after liquid injection and packaging. According to the prepared electrode plates, on the basis of guaranteeing a high coating amount and a high thickness of the electrode plates, the electrode plates have a porous structure, and therefore the lithium-ion battery can perform rapid charging under the condition of high energy density and meanwhile has high-rate discharge and low-temperature discharge performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a porous electrode lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion battery is a type of battery that uses lithium metal or lithium alloy as the negative electrode material and uses a non-aqueous electrolyte solution. Lithium-ion batteries have the advantages of high energy density, high working voltage, long cycle life, low self-discharge, no memory effect, and good safety performance. They have been widely used in mobile phones, computers, video cameras, cameras, etc. Technology, energy storage batteries for large power plants, UPS power supplies, medical instrument power supplies and other fields play an important role. With the increasing prosperity of electronic consumer goods, the market demand for lithium-ion batteries is growing rapidly, and the performance requirements for lithium-ion batteries are getting hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M10/0587H01M10/0525
CPCY02E60/10Y02P70/50
Inventor 高回春袁中直邹友生林典明刘金成
Owner EVE ENERGY CO LTD
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