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Alkali metal negative electrode composite protective film and preparation method thereof, alkali metal negative electrode and alkali metal secondary battery

A secondary battery, alkali metal technology, used in secondary batteries, fuel cell-type half-cells, secondary battery-type half-cells, negative electrodes, etc., can solve problems such as corrosion, prevent dendrites and corrosion, Good barrier effect to prevent uncontrolled growth

Pending Publication Date: 2021-03-19
吉林省东驰新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the above-mentioned problems existing in the above-mentioned alkali metal negative electrodes, at present, the growth of dendrites is mainly reduced by constructing 3D current collectors, but in a corrosive battery system, although the higher specific surface area of ​​3D current collectors can reduce the growth of dendrites , but will cause more serious corrosion

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  • Alkali metal negative electrode composite protective film and preparation method thereof, alkali metal negative electrode and alkali metal secondary battery
  • Alkali metal negative electrode composite protective film and preparation method thereof, alkali metal negative electrode and alkali metal secondary battery
  • Alkali metal negative electrode composite protective film and preparation method thereof, alkali metal negative electrode and alkali metal secondary battery

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preparation example Construction

[0046] The present invention also provides a preparation method of the alkali metal negative electrode composite protective film described in the above technical solution, comprising the following steps:

[0047] The fluorocarbon polymer is flatly spread on the surface of the alkali metal negative electrode, the in-situ reaction is carried out on the surface of the alkali metal negative electrode, and the composite protective film of the alkali metal negative electrode is obtained by growing on the surface of the alkali metal negative electrode.

[0048] In the present invention, unless otherwise specified, all raw materials are commercially available products well known to those skilled in the art.

[0049] In the present invention, the fluorocarbon polymer preferably includes one or more of polytetrafluoroethylene, polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene and ethylene-tetrafluoroethylene copolymer; when the When the fluorocarbon polymer is two or ...

Embodiment 1

[0094] Provide positive electrode materials, the electrode material is Ru, the conductive material is carbon nanotubes, the binder is polyvinylidene fluoride, and the mass ratio of Ru, polyvinylidene fluoride and carbon nanotubes is 2:1:6;

[0095] Spread 0.2 g of polytetrafluoroethylene on the surface of a lithium sheet (14 mm in diameter and 400 μm in thickness), react in situ at a temperature of 300 ° C for 5 min in an argon glove box, and then cool naturally to room temperature, and remove the remaining residue on the surface of the lithium sheet. The polytetrafluoroethylene is cleaned up to obtain an alkali metal negative electrode containing a composite protective film, and the thickness ratio of the composite protective film to the alkali metal is 1:20;

[0096] Use 0.2 mL of tetraethylene glycol dimethyl ether solution of lithium trifluoromethanesulfonate with a molar concentration of 1 mol / L as the electrolyte;

[0097] The glass fiber membrane is used as the diaphrag...

Embodiment 2

[0101] Provide positive electrode materials, the electrode material is Ru, the conductive material is carbon nanotubes, the binder is polyvinylidene fluoride, and the mass ratio of Ru, polyvinylidene fluoride and carbon nanotubes is 2:1:6;

[0102] Spread 0.2g of polyvinylidene fluoride on the surface of a lithium sheet (14mm in diameter and 400μm in thickness) in mass, react in situ at 300°C for 5min in an argon glove box, and then cool naturally to room temperature. The remaining polyvinylidene fluoride on the surface is cleaned to obtain an alkali metal negative electrode containing a composite protective film, and the thickness ratio of the composite protective film to the alkali metal is 1:20;

[0103] Use 0.2 mL of tetraethylene glycol dimethyl ether solution of lithium trifluoromethanesulfonate with a molar concentration of 1 mol / L as the electrolyte;

[0104] The glass fiber membrane is used as the diaphragm;

[0105] Oxygen as gas;

[0106] The alkali metal negative...

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Abstract

The invention belongs to the technical field of alkali metal secondary batteries and particularly relates to an alkali metal negative electrode composite protective film, a preparation method thereof,an alkali metal negative electrode, application thereof and an alkali metal secondary battery. The alkali metal negative electrode composite protective film provided by the invention comprises alkalifluoride metal and fluorine-doped carbon in chemical composition. The composite protective film can homogenize the surface ion flow of the alkali metal negative electrode, promote the uniform deposition of alkali metal and prevent the uncontrollable growth of alkali metal dendrites; meanwhile, the composite protective film has a good barrier effect on pollutants such as oxygen, water, electrolyteand strong oxidizing substances in a battery system, and the corrosion condition of the alkali metal negative electrode can be weakened; when the alkali metal negative electrode composite protectivefilm is applied to an alkali metal negative electrode of an alkali metal secondary battery, the cycle performance of the alkali metal secondary battery can be greatly improved.

Description

technical field [0001] The invention belongs to the technical field of alkali metal secondary batteries, and in particular relates to an alkali metal negative electrode composite protective film and a preparation method thereof, an alkali metal negative electrode and an alkali metal secondary battery. Background technique [0002] With the development of society, the energy density of existing primary lithium-ion batteries has been difficult to meet the needs of high-power electrical equipment such as electric vehicles and smart grids. The higher energy density of alkali metal secondary batteries has attracted the attention of many researchers. However, the development of alkali metal secondary batteries also faces many challenges, such as the decomposition of the electrolyte, poor reversibility of the positive electrode, and instability of the negative electrode. With the development of scientific research, the stability of the electrolyte and the poor performance of the p...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/134H01M10/0525H01M10/054H01M10/052H01M12/08
CPCH01M4/134H01M4/628H01M10/052H01M10/0525H01M10/054H01M12/08H01M2004/027Y02E60/10
Inventor 谢海明丛丽娜孙立群刘玉龙刘军刘佳
Owner 吉林省东驰新能源科技有限公司
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