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Lithium ion battery negative plate and preparation method thereof

A technology for lithium ion batteries and negative electrode sheets, which is applied in electrode manufacturing, battery electrodes, secondary batteries, etc., can solve the problems of complex manufacturing process, poor consistency of fast charging performance, and low energy density.

Inactive Publication Date: 2021-02-05
GUANG DONG VDL NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the above-mentioned defects in the prior art, and provide a lithium-ion battery negative electrode sheet and a preparation method thereof, which solve the complex manufacturing process, low energy density and consistent fast charging performance of the battery negative electrode sheet in the prior art. Poor technical issues

Method used

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  • Lithium ion battery negative plate and preparation method thereof

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Embodiment 1

[0022] like figure 1 As shown, the present invention provides a lithium ion battery negative electrode sheet, which includes a copper foil 1, a first graphite layer 2 coated on one side of the copper foil 1, a second graphite layer 3 coated on the other side of the copper foil 1, The first fast-charging material layer 4 is coated on the side of the first graphite layer 2 facing away from the copper foil 1 , and the second fast-charging material layer 5 is coated on the side of the second graphite layer 3 facing away from the copper foil 1 .

[0023] The manufacturing process of the negative electrode sheet designed with this structure is relatively simple, it does not need to coat a layer of fast charging material on the outside of the tiny particles, and does not need to be produced separately, just coat the graphite layer and the fast charging material on the copper foil 1 respectively Therefore, the negative electrode sheet designed with this structure has the advantage of ...

Embodiment 2

[0027] Please refer to figure 1 , the present invention also provides a kind of preparation method of lithium-ion battery negative plate, comprises the following steps:

[0028] S1, coating a high-capacity negative electrode graphite material on one side of the copper foil 1 to form a first graphite layer 2;

[0029] S2, coating a high-capacity negative electrode graphite material on the other side of the copper foil 1 to form a second graphite layer 3;

[0030] S3, coating the fast charging material on the side of the first graphite layer 2 facing away from the copper foil 1 to form the first fast charging material layer 4;

[0031] S4, coating the fast charging material on the side of the second graphite layer 3 facing away from the copper foil 1 to form the second fast charging material layer 5 and form the negative electrode sheet.

[0032] This preparation method is relatively simple, and it does not need to coat a layer of fast-charging material on the outside of the t...

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Abstract

The invention relates to the field of battery negative plates, and discloses a lithium ion battery negative plate. The negative plate comprises a copper foil, a first graphite layer coated on one surface of the copper foil, a second graphite layer coated on the other surface of the copper foil, a first quick charge material layer coated on one surface of the first graphite layer back to the copperfoil, and a second fast charging material layer which is coated on one surface, back to the copper foil, of the second graphite layer. The invention also discloses a preparation method of the lithiumion battery negative plate. The technical problems that in the prior art, a battery negative plate is complex in manufacturing process, low in energy density and poor in fast charging performance consistency are solved; the negative plate provided by the invention has the advantage of convenience in manufacturing, is convenient for high-efficiency automatic production, and meets the high-qualityand high-efficiency production requirements of customers; besides, the consistency of the quick charging performance of the negative plate with the structural design is convenient to maintain, the negative plate can be ensured to strictly meet the quality index of the quick charging performance, and meanwhile, the negative plate adopting the coating structure has the advantage of high energy density.

Description

technical field [0001] The invention relates to the field of negative electrode sheets of batteries, in particular to a negative electrode sheet of a lithium ion battery and a preparation method thereof. Background technique [0002] At present, in order to meet the fast charging performance of lithium-ion batteries, in the prior art, a layer of fast-charging material is generally coated on the outside of the negative electrode material particles of lithium-ion batteries manually or by equipment, and then the negative electrode ingredients and coating are carried out to make the negative electrode. The production process of this kind of negative electrode sheet is relatively complicated, and the consistency of fast charging performance of the negative electrode sheet produced by it is poor, and its energy density is low, which does not meet the requirements of customers. Contents of the invention [0003] The purpose of the present invention is to overcome the above-mentio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/1393H01M4/04H01M10/0525
CPCH01M4/0404H01M4/133H01M4/1393H01M10/0525Y02E60/10
Inventor 张良均
Owner GUANG DONG VDL NEW ENERGY CO LTD
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