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Lithium ion battery, novel current collector and preparation method of novel current collector

A technology of lithium-ion batteries and current collectors, applied in electrode manufacturing, battery electrodes, secondary batteries, etc., can solve problems such as difficult to prevent fires

Inactive Publication Date: 2021-05-11
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, researchers have conducted a lot of research on the thinning technology of current collectors. For example, patent CN 110600745 A discloses a copper-plated composite current collector based on polyimide film. Cycle performance and rate performance, while the electrical insulation properties of polyimide have improved the thermal runaway of the battery, but this strategy is difficult to eliminate the fire problem caused by the thermal runaway of the battery

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  • Lithium ion battery, novel current collector and preparation method of novel current collector

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preparation example Construction

[0031] The present invention also provides a preparation method of the novel current collector as described above, the preparation method comprising the following steps:

[0032] (1) The substrate layer is prepared by in-situ polymerization, solution casting or melt casting.

[0033] Specifically, the film substrate layer is first prepared by in-situ polymerization, solution casting or melt casting, and then the surface is cleaned with deionized water, ethanol, etc., and then dried in a vacuum drying oven.

[0034] Wherein, polymer monomer is used for in-situ polymerization, and polymer body is used for solution casting or melting casting.

[0035] (2) The substrate layer is subjected to plasma treatment, so that the upper and lower surfaces of the substrate layer are activated; wherein, a flame retardant is disposed in the substrate layer.

[0036] Specifically, the dried film is subjected to plasma treatment for use, so that both the upper and lower surfaces thereof are act...

Embodiment 1

[0044] The preparation method of the novel current collector provided in Example 1 of the present invention comprises the following steps:

[0045] (1) First dissolve polyacrylonitrile powder into dimethylformamide, then add triphenyl phosphate with a mass fraction of 10% into it and continue to stir until dissolved, then pour the dissolved homogeneous solution to obtain the required Film substrate layer.

[0046] (2) Plasma treatment is performed on the dried film substrate for use, so that both the upper and lower surfaces are activated, which is beneficial to increase its binding force with the adhesive layer.

[0047](3) Place the film substrate layer on the magnetron sputtered substrate to prepare a 20nm silicon oxide enhancement layer.

[0048] (4) Place the thin film base material strengthened by the binder on the magnetron sputtering substrate to prepare 800nm ​​metal aluminum to obtain the required current collector.

[0049] (5) Commercialized NCM523 is used as an ...

Embodiment 2

[0051] The preparation method of the novel current collector provided in Example 2 of the present invention comprises the following steps:

[0052] (1) First dissolve polyacrylonitrile powder into dimethylformamide, then add triphenyl phosphate with a mass fraction of 20% and continue to stir until dissolved, then pour the dissolved homogeneous solution to obtain the required Film substrate layer.

[0053] (2) Plasma treatment is performed on the dried film substrate for use, so that both the upper and lower surfaces are activated, which is beneficial to increase its binding force with the adhesive layer.

[0054] (3) Place the film substrate layer on the magnetron sputtered substrate to prepare a 20nm silicon oxide enhancement layer.

[0055] (4) Place the thin film base material strengthened by the binder on the magnetron sputtering substrate to prepare 800nm ​​metal aluminum to obtain the required current collector.

[0056] (5) Commercialized NCM523 is used as an active ...

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Abstract

The invention belongs to the related technical field of lithium ion batteries, and discloses a lithium ion battery, a novel current collector and a preparation method of the novel current collector. The novel current collector comprises a base material layer, bonding layers and a metal layer, the bonding layers are arranged on the two opposite surfaces of the base material layer respectively, the metal layer is arranged on the surfaces, far away from the base material layer, of the bonding layers, and a flame retardant is arranged in the base material layer. Therefore, the commercial copper foil or aluminum foil can be effectively thinned by the polymer base material layer, so that the energy density of the battery is improved, flame retardance can be ensured after the battery is burnt by using the flame retardant, and hidden dangers are reduced.

Description

technical field [0001] The invention belongs to the technical field related to lithium ion batteries, and more specifically relates to a lithium ion battery, a novel current collector and a preparation method thereof. Background technique [0002] With the continuous development of the new energy industry, lithium-ion batteries have been widely used in portable digital products such as notebook computers and mobile phones, and are also used as power devices in electric bicycles or electric vehicles. However, the current commercial lithium-ion battery technology also has many problems, such as low energy density and poor safety performance, which limit its further use. [0003] Currently commercial lithium-ion batteries use copper foil or aluminum foil as a current collector, which has a high density and is an inactive part of the battery component, so its impact on energy density cannot be ignored. Therefore, researchers have conducted a lot of research on the thinning tech...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M10/0525H01M4/04A62C3/16C08L33/20C08K5/523C08J7/12C08J7/06
CPCH01M4/667H01M4/661H01M10/0525H01M4/0402A62C3/16C08J7/123C08J7/06C08J2333/20C08K5/523Y02E60/10
Inventor 黄云辉伽龙刘志康
Owner HUAZHONG UNIV OF SCI & TECH
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