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Metal-free current collector composite electrode and preparation method thereof, and lithium ion battery

A composite electrode and current collector technology, applied in the field of lithium-ion batteries, can solve problems such as hidden dangers of lithium-ion battery quality, narrow application range, complicated processes, etc., and achieve the effects of excellent compatibility and contact, reduction of material costs, and reduction of material costs.

Inactive Publication Date: 2020-04-03
CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process of this method is very complicated, and it also involves soaking the film in water. If the subsequent drying is not thorough, it will be a serious quality hazard for lithium-ion batteries; Assembled as a button battery, the application range is narrow

Method used

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  • Metal-free current collector composite electrode and preparation method thereof, and lithium ion battery
  • Metal-free current collector composite electrode and preparation method thereof, and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] This embodiment provides a metal-free current collector composite electrode, and its structural schematic diagram is as follows figure 1 As shown, it consists of a separator 1 and an electrode active material 2 coated on the surface of the separator 1, wherein the separator 1 is composed of a base film 11 and a coating 12 formed on the surface of the base film 11, and the coating 12 includes inorganic particles and bonding agent, in this embodiment the inorganic particles are LiGe 2 (PO 4 ) 3 , the binder is polyvinylidene fluoride.

[0028] This embodiment also provides a method for preparing the metal-free current collector composite electrode, comprising the following steps:

[0029] (1) Preparation of diaphragm: LiGe with a particle size of 50nm 2 (PO 4 ) 3 Particles and binder polyvinylidene fluoride are dispersed in NMP (N-methylpyrrolidone) at a mass ratio of 7:3 to obtain a mixed slurry, and the mixed slurry is coated on a 20 μm thick base film polyethyle...

Embodiment 2

[0035] This embodiment provides a metal-free current collector composite electrode, which is composed of a separator and an electrode active material coated on the surface of the separator, the separator includes a base film and a coating formed on the surface of the base film, and the coating includes Inorganic particles and binding agent, in the present embodiment, the inorganic particles are AlPO 4 , the binder is polyvinylidene fluoride.

[0036] This embodiment also provides a method for preparing the metal-free current collector composite electrode, comprising the following steps:

[0037] (1) Preparation of diaphragm: AlPO with a particle size of 1 μm 4 The particles and the binder polyvinylidene fluoride were dispersed in an acetone solvent at a mass ratio of 5:5 to obtain a mixed slurry, and the mixed slurry was coated on a 30 μm thick base film polyethylene, and dried at 55°C to obtain a separator. Its thickness is 35 μm and its porosity is 30%;

[0038] (2) Prepara...

experiment example

[0041] Carry out performance test to the battery gained in embodiment 1, figure 2 It is a typical charge and discharge process curve of the battery. It can be seen from the figure that the curve reflects the typical curve characteristics of nickel-cobalt lithium manganese oxide / graphite, and the battery has excellent polarization performance.

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Abstract

The invention provides a metal-free current collector composite electrode and a preparation method thereof, and a lithium ion battery. The metal-free current collector composite electrode is composedof a diaphragm and an electrode active material coated on the surface of the diaphragm, the diaphragm comprises a base membrane and a coating formed on the surface of a base diaphragm, the coating comprises inorganic particles and a binder, and the inorganic particles are AlPO4 and / or LiGe2 (PO4) 3. According to the composite electrode and the battery thereof provided by the invention, as no current collector is used, on one hand, the energy density is improved, on the other hand, the material cost is obviously reduced, and on the basis of the mass ratio of the current collector in the currentcommon battery, the energy density is improved by about 18%, and the material cost is reduced by about 8%. In addition, the battery preparation process using the composite electrode is consistent with a traditional lithium ion battery preparation process, so that the existing process and equipment can be directly applied to large-scale production.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, and more specifically, to a metal-free current collector composite electrode, a preparation method thereof, and a lithium-ion battery. Background technique [0002] Lithium-ion batteries are widely used in many fields due to their many outstanding advantages. However, with the continuous expansion of application fields and the continuous improvement of application requirements, the requirement for improving the energy density of batteries is more urgent. Generally, lithium-ion batteries are composed of positive pole pieces, negative pole pieces, separators, electrolytes, and outer packaging materials. Except for positive and negative active materials participating in electrochemical reactions, the others are inactive materials. The development of high energy density is mainly In order to reduce the proportion of inactive substances. [0003] The general process of traditional electrode prepa...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M4/13H01M4/139H01M10/0525H01M10/058
CPCH01M4/13H01M4/139H01M10/0525H01M10/058H01M50/403H01M50/431H01M50/46Y02E60/10Y02P70/50
Inventor 李翔钱义赵挺仝红亮刘景浩
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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