Element-doped diamond-like carbon film modified battery negative electrode and preparation method and application thereof

A diamond film and element doping technology, which is applied in electrode manufacturing, battery electrodes, negative electrodes, etc., can solve the problems of easy volume expansion, unstable battery performance, and short service life

Inactive Publication Date: 2020-03-20
SHENZHEN INST OF ADVANCED TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an element-doped diamond-like film modified battery negative electrode and its preparation method and application. The SEI film formed by the reaction of liquid at the interface causes unstable battery performance and short service life.

Method used

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  • Element-doped diamond-like carbon film modified battery negative electrode and preparation method and application thereof
  • Element-doped diamond-like carbon film modified battery negative electrode and preparation method and application thereof
  • Element-doped diamond-like carbon film modified battery negative electrode and preparation method and application thereof

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preparation example Construction

[0033] Correspondingly, the present invention also provides a method for preparing an element-doped diamond-like carbon film modified battery negative electrode, comprising the following steps:

[0034] S01. Provide a metal foil material;

[0035] S02. Prepare an element-doped diamond-like film on any side of the metal foil material to obtain a battery negative electrode modified by the element-doped diamond-like film; the doping element in the element-doped diamond-like film is selected from F, At least one of N, P, Fe, Co, Ni, W;

[0036] Wherein, the method for preparing an element-doped diamond-like carbon film on any side of the metal foil material is selected from at least one of magnetron sputtering, plasma chemical vapor deposition, ion beam assisted deposition, pulsed laser deposition, and filtered cathodic vacuum arc deposition. kind.

[0037] Specifically, in the above step S01, a metal foil material is provided, preferably, the metal foil material is at least one...

Embodiment 1

[0071] The positive electrode, the negative electrode, the electrolyte solution and the diaphragm of the battery are respectively prepared and assembled, wherein the negative electrode is an aluminum negative electrode modified with a fluorine-doped diamond-like film.

[0072] Preparation of negative electrode: The aluminum negative electrode modified by the fluorine-doped diamond-like film is prepared by magnetron sputtering, including the following steps:

[0073] Provide a metal aluminum foil material, and carry out surface cleaning and drying treatment on the metal foil material; specifically, the surface cleaning is: control the pressure at 10MPa, sandblast the metal aluminum foil for 30s, and then use deionized water and ethanol alternately Washing several times; the drying process is as follows: the metal foil obtained by the above cleaning is placed in a vacuum box to dry.

[0074] Put the processed metal foil material into the magnetron sputtering coating machine, vac...

Embodiment 2

[0085] Compared with the method of Example 1, the "coating time is 15min" in the step of preparing the aluminum negative electrode modified by the fluorine-doped diamond-like film by magnetron sputtering is replaced with "the coating time is 30min"; The other steps are the same as in Example 1 to manufacture a battery.

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Abstract

The invention provides a battery negative electrode modified by an element-doped diamond-like carbon film. The battery negative electrode comprises a metal foil material and an element-doped diamond-like carbon film arranged on any surface of the metal foil material, and doped elements in the element-doped diamond-like carbon film are selected from at least one of F, N, P, Fe, Co, Ni and W; the metal foil material serves as a current collector and a negative electrode active material at the same time. The element-doped diamond-like carbon film is used for modifying the battery negative electrode, so that the problems that when a metal material is directly used as the battery negative electrode, the volume of the metal material is easy to expand, and the metal material is easy to react withelectrolyte at an interface to form an SEI film are solved, the stability of battery performance is improved, and the service life is prolonged.

Description

technical field [0001] The invention relates to the field of batteries, in particular to an element-doped diamond-like film modified battery negative electrode, a preparation method and application thereof. Background technique [0002] Lithium-ion batteries occupy an important position in the field of energy storage due to their advantages such as high energy density, long cycle life, environmental protection and pollution-free, and no memory effect. [0003] At present, metal aluminum is directly used as the negative electrode, but the direct use of aluminum as the negative electrode has the following disadvantages: (1) When lithium ions and aluminum metal form an alloy, a huge volume expansion occurs, which causes the powdering of the electrode material and causes the battery capacity to decay. Short life; (2) Since the volume of the aluminum negative electrode is constantly changing during the charging and discharging process, the solid electrolyte membrane (SEI) is unst...

Claims

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Application Information

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IPC IPC(8): H01M4/134H01M4/1395H01M4/04H01M4/36H01M4/38H01M4/583H01M10/0525
CPCH01M4/0402H01M4/134H01M4/1395H01M4/366H01M4/38H01M4/583H01M10/0525H01M2004/027Y02E60/10
Inventor 唐永炳彭松俏周小龙
Owner SHENZHEN INST OF ADVANCED TECH
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