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Elastic current collector, preparation method of elastic current collector, battery electrode plate, and flexible lithium ion battery

A technology for lithium-ion batteries and battery electrodes, applied in battery electrodes, electrode carriers/current collectors, secondary batteries, etc., can solve the problem of shedding of the active material film layer, the high flexibility of the current collector cannot be achieved, and the active material film layer cannot be guaranteed Combination with metal current collectors and other issues to achieve the effect of increasing the interface contact area, improving cycle stability, and good tensile properties

Active Publication Date: 2018-06-12
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing flexible lithium-ion battery system, the flexible electrode is mostly formed by coating the active material film layer on the metal current collector with certain flexibility, but such a structure cannot ensure a good relationship between the active material film layer and the metal current collector. Combination
In order to improve the bonding strength of the interface between the metal current collector and the active material film layer, the industry has improved the surface roughness of the metal current collector, but the high flexibility of the current collector cannot be achieved. During application, the pole piece is prone to the phenomenon that the active material film layer in the bending area falls off from the current collector

Method used

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  • Elastic current collector, preparation method of elastic current collector, battery electrode plate, and flexible lithium ion battery
  • Elastic current collector, preparation method of elastic current collector, battery electrode plate, and flexible lithium ion battery
  • Elastic current collector, preparation method of elastic current collector, battery electrode plate, and flexible lithium ion battery

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preparation example Construction

[0050] Correspondingly, an embodiment of the present invention provides a method for preparing an elastic current collector, including the following steps:

[0051] S10, stretch the elastic polymer substrate from the transverse direction and the longitudinal direction and fix it on the rigid base;

[0052] S20, depositing and preparing a conductive layer on the surface of the stretched elastic polymer substrate, the material of the conductive layer includes metal and / or carbon material;

[0053] S30. Peel the elastic polymer substrate deposited with the conductive layer from the rigid base, release the tensile force to return to the original size of the elastic polymer substrate, and the conductive layer is formed on the elastic polymer substrate A corrugated structure is an elastic current collector. The elastic current collector includes an elastic polymer substrate and a conductive layer disposed on the elastic polymer substrate. The conductive layer has a corrugated structure, an...

Embodiment 1

[0069] A method for preparing an elastic current collector includes the following steps:

[0070] S110: The purified polyimide film substrate is stretched in the transverse direction and the longitudinal direction at an elongation of 30% and then fixed on the rigid base;

[0071] S120: Place the rigid substrate fixed with the polyimide film on the substrate holder of the vacuum chamber, and extract the gas in the vacuum chamber. When the vacuum degree in the vacuum chamber reaches -7 Evaporation starts at Torr, and the metal copper is sputtered with an electron beam with a power of 600W, and the metal copper starts to evaporate when heated; the sputtering rate is measured with the crystal oscillator of the film thickness meter, when the rate can reach stably When, open the baffle of the vacuum chamber, rotate the substrate holder at a speed of 20 revolutions per minute, evaporate for 30 minutes, and then cool down to form a continuous and bright metal copper conductive layer on the ...

Embodiment 2

[0082] A method for preparing an elastic current collector includes the following steps:

[0083] S210: The purified polydimethylsiloxane (PDMS) substrate is stretched in the transverse and longitudinal directions at an elongation of 200% and then fixed on the rigid substrate;

[0084] S220: Then the PDMS substrate fixed on the rigid substrate is subjected to copper immersion treatment for 15 minutes, the pH of the copper immersion solution is 11-13, and the temperature is 25°C-45°C; after washing with water, the nickel immersion treatment is performed for 3.5 minutes, and the pH of the nickel precipitation solution is It is 4.5-6.3, the temperature is 65℃-78℃; after washing, electroplating nickel is carried out for 11 minutes. The treatment conditions are: stainless steel as anode, elastic polymer as cathode, direct current or pulsed electricity, metal nickel plating solution pH It is 3.3-5.1, and the temperature is 35℃-52℃, forming a metal nickel copper conductive layer;

[0085] ...

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Abstract

The invention provides an elastic current collector which comprises an elastic polymer substrate and a conductive layer arranged on the elastic polymer substrate, wherein the conductive layer is provided with a folding structure and comprises a metal and / or a carbon material; the elastic current collector has high flexibility and cycling stability, is used for preparation of a lithium ion batteryelectrode plate and can effectively avoid a phenomenon of powder falling of the electrode plate caused by mechanical deformation of the electrode plate and internal expansion of active substances. Theinvention further provides a preparation method of the elastic current collector, a battery electrode plate adopting the elastic current collector, and a flexible lithium ion battery.

Description

Technical field [0001] The present invention relates to the technical field of lithium ion batteries, in particular to an elastic current collector and a preparation method thereof, a battery electrode pole piece and a flexible lithium ion battery. Background technique [0002] With the development of flexible electronic technology, various flexible electronic products have gradually entered people's lives, and the development of flexible energy storage devices matching these flexible electronic products has also become a research and development hotspot in the industry. [0003] In the research and development of existing flexible lithium-ion batteries, it is a technical problem to realize the high flexibility and mechanical properties of the pole piece, and to ensure that it can work normally under various mechanical deformation states without causing a large loss of performance. In the existing flexible lithium-ion battery system, most of the flexible electrodes are formed by co...

Claims

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Application Information

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IPC IPC(8): H01M4/64H01M4/66H01M4/62H01M4/583H01M4/137H01M10/0525
CPCH01M4/137H01M4/583H01M4/62H01M4/64H01M4/663H01M4/666H01M4/667H01M10/0525Y02E60/10
Inventor 杨婉璐王平华
Owner HUAWEI TECH CO LTD
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