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Current collector, preparation method thereof and soft package lithium ion battery

A current collector and system technology, applied in battery electrodes, secondary batteries, electrode carriers/current collectors, etc., can solve problems such as poor thermal conductivity of metals, affecting battery energy density, and electrolyte decomposition.

Inactive Publication Date: 2020-07-17
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, people's requirements for pouch battery products are increasing day by day. The current collectors used in the positive and negative electrodes of pouch batteries are metal aluminum foil and copper foil respectively. The following problems exist in the use of metal current collectors: First, the metal The density is high, and it accounts for a large proportion of the entire battery, which seriously affects the energy density of the battery; the thermal conductivity of the two metals is poor, especially when the battery cell is thick, the heat generated inside the soft-pack lithium-ion battery is difficult to dissipate quickly, resulting in The electrolyte decomposes; it may also pose a safety hazard when the heat is too large

Method used

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  • Current collector, preparation method thereof and soft package lithium ion battery
  • Current collector, preparation method thereof and soft package lithium ion battery

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preparation example Construction

[0019] A method for preparing a soft pack lithium-ion battery, at least comprising the following methods:

[0020] First, prepare the current collector;

[0021] see figure 1 , figure 1 It is a flow chart of the preparation method of the current collector provided in the present invention.

[0022] Wherein said current collector is a graphene-like / metal film current collector, and the preparation method of said graphene-like / metal film current collector comprises the following steps:

[0023] S1, preparing a graphene-like film;

[0024] The preparation of graphene-like film can adopt following method:

[0025] The graphene-like film can be carbonized and graphitized by using a polymer film in a protective atmosphere or a vacuum environment. The polymer must have excellent mechanical properties and good chemical stability, and it can be any of polyamideimide (PAI), polyimide (PI), polyamide, polyetherimide (PEI) A sort of. The low-temperature carbonization treatment temp...

Embodiment 1

[0040] The preparation method of soft pack lithium ion battery comprises the steps:

[0041] (1), first prepare graphene-like / metal film current collector;

[0042] The graphene-like film is prepared by selecting polymer polyimide (PI) for carbonization treatment under a protective atmosphere, wherein the carbonization treatment temperature is 1000° C., and the treatment time is 10 hours. Then, the polyimide after the low-temperature carbonization treatment is subjected to graphitization treatment under a protective atmosphere to obtain graphene-like. Wherein the graphitization treatment temperature is 2500° C., and the treatment time is 4 hours.

[0043]Then the obtained graphene-like film is rolled and formed;

[0044] The graphene-like film current collector is rolled on PET film. The rolling pressure is set to 100 MPa; the rolling temperature is 300° C., and the feeding speed of the rolling machine is 2 m / min. By setting the rolling pressure, pure graphite films and gr...

Embodiment 2

[0051] The preparation method of soft pack lithium ion battery comprises the steps:

[0052] (1), first prepare graphene-like / metal film current collector;

[0053] The graphene-like film is prepared by selecting polyamide-imide (PAI) for carbonization treatment under a protective atmosphere, wherein the carbonization treatment temperature is 1200° C., and the treatment time is 9 hours. Then, the polyimide after the low-temperature carbonization treatment is subjected to graphitization treatment under a protective atmosphere to obtain graphene-like. Wherein the graphitization treatment temperature is 2700° C., and the treatment time is 4 hours.

[0054] Then the obtained graphene-like film is rolled and formed;

[0055] The graphene-like film current collector is rolled on PET film. The rolling pressure is set to 20 MPa; the rolling temperature is 100° C., and the feeding speed of the rolling machine is 5 m / min. By setting the rolling pressure, pure graphite films and grap...

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Abstract

The invention discloses a current collector. The current collector is a graphene-like / metal film current collector and comprises a graphene-like film and a metal film arranged on the surface of the bottom of the graphene-like film, wherein the thickness of the graphene-like film ranges from 6 mu m to 10 mu m, and the thickness of the metal layer is not larger than 5 mu m; the graphene-like film isa graphene film subjected to hydrophilic treatment. The current collector provided by the invention has the characteristics of small thickness, low mass, high conductivity and the like. In addition,the invention also provides a preparation method thereof and a soft package lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, a method for preparing a current collector and a current collector film, in particular to a current collector and a preparation method thereof, and also to a soft-pack lithium-ion battery. Background technique [0002] Soft-pack lithium-ion batteries are a type of lithium-ion batteries. Unlike traditional cylindrical batteries and button batteries, soft-pack batteries are widely used in consumer electronics due to their greater specific energy, stronger plasticity, and better safety. Devices and electric vehicles, electric bicycles and many other fields. [0003] At present, people's requirements for pouch battery products are increasing day by day. The current collectors used in the positive and negative electrodes of pouch batteries are metal aluminum foil and copper foil respectively. The following problems exist in the use of metal current collectors: First, the metal The densi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M10/0525
CPCH01M4/661H01M4/663H01M4/667H01M10/0525Y02E60/10
Inventor 何大平杨金龙李伦赵瑜玮舒威
Owner WUHAN UNIV OF TECH