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Lithium ion battery electrode structure and preparation method thereof

A lithium-ion battery and electrode structure technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problem of further greatly reducing the mass and volume of inactive materials, electron and ion transfer and diffusion The path becomes longer, it is difficult to satisfy the problem, etc.

Active Publication Date: 2015-03-18
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, under the premise of ensuring the performance and safety of lithium-ion batteries, the existing lithium-ion battery assembly technology has been very mature, and the inactive material part has been reduced to the extreme value, and it is difficult to further reduce the quality of the inactive material part. and volume; (2) Use active material materials with higher specific capacity to increase the energy density of lithium-ion batteries, but the actual specific capacity of the existing commercial positive and negative active materials has basically reached the extreme value of its practical application , and the development and large-scale promotion and application of new high specific capacity active materials are facing great market challenges; (3) Increasing the thickness of the pole piece to increase the surface density of the battery pole piece is currently the most widely used method to increase the energy density of the battery
This method can greatly increase the specific gravity of the active material per unit mass or unit volume, so that more active materials can be filled in a single battery to participate in the electrochemical reaction to increase the energy density of the lithium-ion battery. However, due to the thickness of the pole piece coating The increase of the electron and ion transfer and diffusion path of the active material inside the electrode becomes longer, and the electrolyte penetration ability inside the pole piece becomes worse, resulting in a significant decrease in the rate performance of the entire lithium-ion battery. Therefore, although this method can increase the energy of the lithium-ion battery Density, but on the premise of greatly sacrificing the power performance of the battery, it is difficult to meet the requirements for the practical application of lithium-ion batteries in the field of high-energy and power batteries
In addition, if the thickness of the pole piece increases to a certain extent, there will be serious problems of cracks and powder falling, which will make the pole piece unusable

Method used

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  • Lithium ion battery electrode structure and preparation method thereof
  • Lithium ion battery electrode structure and preparation method thereof
  • Lithium ion battery electrode structure and preparation method thereof

Examples

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Embodiment 1

[0029] 1. Preparation of graphene coating slurry: First, dissolve 2 g of sodium carboxymethyl cellulose in 198 g of deionized water, use a mechanical stirrer to stir at a rate of 700 rpm for 1 h until uniform, and prepare 1% carboxymethyl cellulose The aqueous solution of sodium methylcellulose; the graphene water-based conductive paste obtained by 50g intercalation stripping method is added in the sodium carboxymethylcellulose solution of 1% content (wherein the content of graphene in the graphene water-based conductive paste is 4%, the number of graphene layers is 3-7 layers, and the typical size of graphene is 5-10 μm), figure 2 It is a transmission electron microscope picture of graphene after freeze-drying the graphene conductive paste. From the high-resolution transmission electron microscope picture, we can see that the number of layers of graphene is 4. Use a mechanical stirrer to stir at a rate of 700 rpm for 1 h until the graphene slurry is uniformly dispersed in a ...

Embodiment 2

[0037] 1. Preparation of graphene coating slurry: First, dissolve 2 g of sodium carboxymethyl cellulose in 198 g of deionized water, use a mechanical stirrer to stir at a rate of 700 rpm for 1 h until uniform, and prepare 1% carboxymethyl cellulose The aqueous solution of sodium methylcellulose; the graphene water-based conductive paste obtained by 50g intercalation stripping method is added in the sodium carboxymethylcellulose solution of 1% content (wherein the content of graphene in the graphene water-based conductive paste is 4%, the number of graphene layers is 3-7 layers, and the typical size of graphene is 5-10 μm). Use a mechanical stirrer to stir at a rate of 700 rpm for 1 h until the graphene slurry is uniformly dispersed in a 1% sodium carboxymethylcellulose solution to prepare a graphene-coated slurry.

[0038] 2. Preparation of lithium iron phosphate coating slurry: weigh 64g of lithium iron phosphate, 8g of conductive carbon black SP, 8g of polyvinylidene fluorid...

Embodiment 3

[0042]1. Preparation of coating slurry for multi-walled carbon nanotubes: First, dissolve 2 g of sodium carboxymethyl cellulose in 198 g of deionized water, use a mechanical stirrer to stir at a rate of 700 rpm for 1 h until uniform, and configure to 1% The aqueous solution of sodium carboxymethyl cellulose with a content of 1%; 50g of multi-walled carbon nanotube aqueous conductive paste is added to the sodium carboxymethyl cellulose solution with a content of 1% (wherein the multi-walled carbon nanotube aqueous conductive paste is The content of carbon nanotubes is 3%, the diameter of multi-walled carbon nanotubes is 10-30nm, and the length is 30-50μm), using a mechanical stirrer to stir at a rate of 700 rpm for 1h until the multi-walled carbon nanotube slurry is evenly dispersed In a 1% sodium carboxymethyl cellulose solution, a multi-walled carbon nanotube coating slurry is prepared.

[0043] 2. Preparation of lithium cobaltate coating slurry: weigh 80g of lithium cobaltat...

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Abstract

The invention relates to a lithium ion battery electrode structure and a preparation method thereof, belonging to the technical field of a lithium ion battery. According to the method, a nano carbon material and an active substance are laminated, so that the content of non-active substances, such as positive and negative current collectors, positive and negative tabs and a diaphragm in positive and negative electrodes of the lithium ion battery can be reduced on the basis that the capacity of the lithium ion battery is not reduced, and the mass energy density and the volume energy density of the lithium ion battery can be greatly improved. The preparation method of the lithium ion battery electrode structure is compatible with the traditional process, so that the process is simple, the operation is convenient, the effect is obvious, and the application significant is great.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery electrode structure and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high specific energy, high working voltage, low self-discharge, good cycle life, environmental friendliness, and good safety performance. Therefore, they have been widely used in portable mobile electronic devices such as mobile communications and notebook computers. , and in the field of power batteries, lithium-ion batteries are also the most potential competitors among all known chemical power sources. [0003] However, in the field of portable mobile electronic products, ultra-thin mobile phones, notebook computers, and tablet computers have become the mainstream of fashion, which puts forward higher requirements for the volumetric energy density of lithium-ion batteries. The development needs of thin...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/13H01M4/139B82Y30/00
CPCB82Y30/00H01M4/13H01M4/139H01M4/62H01M10/0525Y02E60/10
Inventor 李峰宋仁升闻雷裴嵩峰黄坤成会明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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