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Lithium ion battery anode lithium supplement pole piece and preparation method thereof

A technology of lithium-ion batteries and negative pole pieces, applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve problems such as capacity fading, achieve the effects of reducing contact area, facilitating operation, and improving absorption

Inactive Publication Date: 2019-05-21
湖北锂诺新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The purpose of the present invention is also to provide a method for preparing lithium-replenishing negative electrodes of lithium-ion batteries. The method is used to prepare microstructure grooves on the surface of the above-mentioned negative electrodes, which can realize effective lithium replenishment and solve the problem of capacity fading caused by lithium consumption. , at the same time, the groove structure can improve the retention and infiltration efficiency of the electrolyte, which can be used as a technical direction for the commercial production of lithium-ion batteries to improve the first effect and cycle life

Method used

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  • Lithium ion battery anode lithium supplement pole piece and preparation method thereof
  • Lithium ion battery anode lithium supplement pole piece and preparation method thereof
  • Lithium ion battery anode lithium supplement pole piece and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The preparation method of the present invention is carried out according to the following steps:

[0030] (1) Prepare a negative electrode slurry with a solid content of 49% by mixing silicon oxide-graphite composite powder, conductive agent carbon black, and binder polyvinylidene fluoride with the solvent methyl pyrrolidone at a mass ratio of 96:1.6:2.4 , evenly coated on 8μm-thick copper foil, and then made into negative electrode roll material through drying, rolling, and slitting processes.

[0031] (2) The negative electrode sheet with a thickness of 132 μm (the active material coating thickness is 62 μm) is treated with a pulsed laser to construct a double-sided micro-groove structure on the upper and lower surfaces of the electrode sheet. During the process, the parameters are set as laser power 50W, scanning speed 10000mm / s, and the groove depth is about 42μm, and the width is 35μm.

[0032] (3) A lithium layer with a thickness of 10 μm is filled in the groove ...

Embodiment 2

[0036] The preparation method of the present invention is carried out according to the following steps:

[0037] Step (1) is identical with embodiment 1

[0038] (2) The negative electrode sheet with a thickness of 132 μm (the active material coating thickness is 62 μm) is treated with a pulsed laser to construct a double-sided micro-groove structure on the upper and lower surfaces of the electrode sheet. During the process, the parameters are set as laser power 50W, scanning speed 10000mm / s, and the groove depth is about 42μm, and the width is 35μm.

[0039] (3) Only the grooves on the upper surface of the pole piece are filled with a lithium layer with a thickness of 12 μm.

[0040] (4) Obtain a negative electrode sheet with a lithium-supplementing micro-groove structure.

[0041] The obtained negative pole piece, ceramic separator, and positive pole piece obtained with the lithium-supplementing micro-groove structure are processed into a lithium-ion battery through proces...

Embodiment 3

[0043] The preparation method of the present invention is carried out according to the following steps:

[0044] Step (1), (2) are identical with embodiment 1

[0045] (3) Fill the groove with a thickness of 12 μm only on the winding non-bending part of the surface of the pole piece.

[0046] (4) Obtain a negative electrode sheet with a lithium-supplementing micro-groove structure.

[0047] The obtained negative pole piece, ceramic separator, and positive pole piece obtained with the lithium-supplementing micro-groove structure are processed into a lithium-ion battery through processes such as assembly, liquid injection, and chemical formation.

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Abstract

The invention relates to a lithium ion battery anode lithium supplement pole piece and a preparation method thereof. The lithium ion battery anode lithium supplementary pole piece comprises a currentcollector (1), active material coating layers (2) which are attached on upper and lower surfaces of the current collector (1), microstructure grooves (3) which are set on a single side or double sidesof the surfaces of the active material coating layers (2), and lithium supplement layers (4) which cover the surfaces of the microstructure grooves (3). According to the lithium ion battery anode lithium supplement pole piece and the preparation method, consumption of lithium in an application process of the battery can be effectively supplemented, a first effect is improved, relatively much space and many channels for soaking of electrolyte are provided, and circulation service life and stability of the battery are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a negative lithium-replenishing pole piece of a lithium-ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used in mobile power supplies, portable appliances, and automobiles due to their high energy density, high average open circuit voltage, and long cycle life. As consumers' demand for higher energy density continues to increase, active materials for lithium-ion batteries are continuously researched and developed, and the specific capacity of traditional graphite negative electrodes is close to the theoretical capacity of 372m Ah / g. Therefore, high-capacity materials that can be alloyed with lithium and their composite materials with higher specific energy, such as silicon-based negative electrode materials, have been developed and applied. [0003] Silicon carbon anode has low discharge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M10/0525H01M10/0587
CPCY02E60/10Y02P70/50
Inventor 马卫杨梢张天赐陈刚
Owner 湖北锂诺新能源科技有限公司
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