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Battery pole piece and preparation method and application thereof

A battery pole piece and pole piece technology, which is applied in the direction of non-aqueous electrolyte battery electrodes, secondary batteries, circuits, etc., can solve the problems of electrode layer expansion effect, multi-layer coating difficulty, affecting battery performance, etc., to reduce expansion effect, improving battery performance and service life, and effectively exerting capacity

Pending Publication Date: 2021-12-31
CHINA AUTOMOTIVE INNOVATION CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the existing manufacturing process, the wet method is to apply the conductive paste on the current collector, the coating thickness is limited, and the multi-layer coating is difficult; if the dry method wants to achieve high energy density effect, it is necessary to The electrode layer is compacted thicker or tighter, but in the case of thicker or tighter compaction, the electrode layer will have a more serious expansion effect, affecting battery performance or even failure

Method used

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  • Battery pole piece and preparation method and application thereof
  • Battery pole piece and preparation method and application thereof
  • Battery pole piece and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0065] This embodiment provides a battery pole piece, such as figure 1 As shown, the battery pole piece is a positive pole piece, including a current collector 1, and one side surface of the current collector is laminated with three layers of pole piece films. Along the direction away from the surface of the current collector, the first pole piece Membrane 2, second pole piece membrane 3 and third pole piece membrane 4, wherein, the porosity of the first pole piece membrane 2 is 3.6%, the porosity of the second pole piece membrane 3 is 14.3%, the third pole piece membrane 4 has a porosity of 20.6%.

[0066] This embodiment also provides a method for preparing the above-mentioned battery pole piece, and the preparation method specifically includes the following steps:

[0067] (I) NCM523 is premixed with conductive carbon black, and then polytetrafluoroethylene is added to carry out fiberization treatment with high-speed stirring for 25s. The rotating speed of high-speed stirr...

Embodiment 2

[0071] This embodiment provides a battery pole piece, the battery pole piece is a positive pole piece, including a current collector, and one side surface of the current collector is stacked with three layers of pole piece film, along the direction away from the surface of the current collector , are respectively the first pole piece film, the second pole piece film and the third pole piece film, wherein the porosity of the first pole piece film is 5.7%, the porosity of the second pole piece film is 9.7%, and the third pole piece film The porosity of the sheet was 14.4%.

[0072] This embodiment also provides a method for preparing the above battery pole piece, the preparation method specifically includes the following steps:

[0073] (I) NCM523 is premixed with conductive carbon black, and then polytetrafluoroethylene is added to carry out fiberization treatment with high-speed stirring for 20s, and the rotating speed of high-speed stirring is 20000rpm to obtain the active ma...

Embodiment 3

[0077] This embodiment provides a battery pole piece, the battery pole piece is a negative pole piece, including a current collector, and one side surface of the current collector is stacked with three layers of pole piece films, along the direction away from the surface of the current collector , are respectively the first pole piece film, the second pole piece film and the third pole piece film, wherein the porosity of the first pole piece film is 18.2%, the porosity of the second pole piece film is 24.0%, and the third pole piece film has a porosity of 18.2%. The porosity of the sheet was 31.8%.

[0078] This embodiment also provides a method for preparing the above battery pole piece, the preparation method specifically includes the following steps:

[0079] (I) artificial graphite and conductive carbon black are premixed, then polytetrafluoroethylene is added and fiberized by high-speed stirring for 30s, and the rotating speed of high-speed stirring is 25000rpm to obtain ...

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Abstract

The invention provides a battery pole piece and a preparation method and application thereof. The battery pole piece comprises a current collector, at least two layers of pole piece membranes are laminated on at least one side surface of the current collector, the porosity of the pole piece membranes is sequentially increased along the direction far away from the surface of the current collector, and the pole piece membranes are prepared by a dry method. The active layer is provided with at least two layers of pole piece membranes, the porosity of the pole piece membranes is sequentially increased in the direction away from the surface of the current collector, the pole piece membranes with the large porosity can relieve the expansion effect of the pole piece membranes with the small porosity, the requirement for high energy density can be met, and enough lithium ion transmission channels can be provided, so that the rate capability of the pole piece is improved.

Description

technical field [0001] The invention belongs to the technical field of batteries, and relates to a battery pole piece, a preparation method and application thereof. Background technique [0002] Lithium-ion batteries, as one of the most important electrochemical energy storage devices at present, have been applied in small-capacity batteries in consumer electronics and power tools, and have gradually expanded to new energy electric vehicles, electric ships, electric aircraft, robots, etc. Emerging fields not only require lithium-ion batteries to have a larger capacity, but also continuously put forward higher requirements for their energy density. However, at present, the energy density of traditional lithium-ion battery materials has approached the theoretical value, and how to further increase the energy density has become a research hotspot. Therefore, under the premise of meeting safety and other comprehensive technical indicators, it is necessary to continuously improv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M10/0525
CPCH01M4/13H01M10/0525Y02E60/10
Inventor 赵嫣然刘张波王鑫萌朱晗
Owner CHINA AUTOMOTIVE INNOVATION CORP
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