Composite negative plate and preparation method and application thereof

A negative electrode sheet and negative electrode technology, which is applied in the field of battery negative electrodes, can solve the problems of battery cycle performance degradation, metal negative electrodes are easily crushed and broken, and achieve the effect of improving rate performance, reducing side reaction process, and increasing ion diffusion rate

Pending Publication Date: 2020-06-19
SHENZHEN INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a composite negative electrode sheet, a secondary battery, which aims to solve the problem that when the metal negative electrode of the existing dual-ion battery undergoes a metal-lithium alloying reaction, the metal negative electrode is easily crushed and broken, resulting in a decrease in battery cycle performance The problem

Method used

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  • Composite negative plate and preparation method and application thereof
  • Composite negative plate and preparation method and application thereof
  • Composite negative plate and preparation method and application thereof

Examples

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preparation example Construction

[0061] Another aspect of the embodiments of the present invention provides a method for preparing a composite aluminum negative electrode sheet, comprising the following steps:

[0062] S01. Provide a metal foil, and sequentially perform pretreatment, glow cleaning and ion etching cleaning on the metal foil;

[0063] S02. The solid electrolyte target deposits a solid electrolyte film layer on the surface of the metal foil;

[0064] S03. Depositing a diamond-like carbon film layer on the surface of the solid electrolyte film layer.

[0065] Specifically, in the above step S01, the selection of the metal foil and its thickness is as described above. If the thickness of the metal foil is 20 microns to 150 microns, preferably, the thickness of the metal foil is 40 microns to 60 microns, more preferably 50 microns.

[0066] Perform pretreatment, glow cleaning and ion etching cleaning on the provided metal foil in sequence, and remove organic matter on the surface of the metal foi...

Embodiment 1

[0094] A preparation method of a composite aluminum negative plate, comprising the following steps:

[0095] S11. Provide aluminum foil, and sequentially perform pretreatment, glow cleaning and ion etching cleaning on the aluminum foil; specifically:

[0096] Put the aluminum foil in distilled water for ultrasonic cleaning, then put the aluminum foil in acetone solution for ultrasonic cleaning, and then put the aluminum foil in absolute ethanol solution for ultrasonic cleaning; after cleaning, dry the substrate with dry nitrogen The surface is blown dry, and finally the sample is dried in a blast drying oven at 80-150°C. Before glow cleaning, adjust the equipment parameters, specifically, fix the dried aluminum foil on the turntable in the magnetron sputtering coating equipment; close the vacuum chamber door, turn on the water cooler to set the ion source, multi-arc The target, the molecular pump, and the water circuit of the vacuum chamber are connected, and the main power s...

Embodiment 2

[0103] A preparation method of a composite aluminum negative electrode sheet, the difference from Example 1 lies in: the lithium phosphine oxynitride layer power is 50W, the nitrogen partial pressure is 0.5Pa, the bias voltage is -150V, and the time is 120min.

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Abstract

The invention provides a composite negative plate. The composite negative plate comprises a metal foil simultaneously used as a negative current collector and a negative active material, a solid electrolyte thin film layer arranged on one surface of the metal foil, and a diamond-like film layer arranged on the surface, deviating from the metal foil, of the solid electrolyte thin film layer. The solid electrolyte layer has good lithium conduction performance, improves the interface ion diffusion rate of the composite metal negative electrode / electrolyte, and improves the rate capability of thebattery. The solid electrolyte layer can effectively isolate the contact between the surface of the composite metal and the electrolyte, so that the side reaction process is reduced, and the coulombicefficiency of the battery is improved; and the solid electrolyte layer can also provide an effective mechanical protection effect for the composite metal negative electrode, and the pulverization problem of the composite metal negative electrode caused by volume change in the electrochemical reaction process is improved, so that the cycle performance of the battery is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of battery negative electrodes, and in particular relates to a composite negative electrode sheet, a preparation method of the composite negative electrode sheet, and an application of the composite negative electrode sheet. Background technique [0002] The manufacturing cost of lithium-ion batteries currently used is high, and the disposal of batteries will cause serious environmental problems. In particular, power batteries for new energy vehicles are challenged by cost and cruising range. And Tang Yongbing's team invented a new type of high energy density aluminum-graphite dual-ion battery technology, which can manufacture a new high-efficiency and low-cost energy storage battery. This new type of battery adjusts the positive and negative electrodes of traditional lithium-ion batteries, and replaces lithium cobaltate, lithium manganate, ternary or lithium iron phosphate, which have been used in batches ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/1393H01M10/0525
CPCH01M4/139H01M4/1393H01M10/0525H01M10/054H01M4/36Y02E60/10
Inventor 唐永炳闫家肖蒋春磊石磊
Owner SHENZHEN INST OF ADVANCED TECH
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