Protection method of alkali metal negative electrode, negative electrode made and application thereof

A technology of alkali metal and alkali metal batteries, which is applied in the direction of battery electrodes, structural parts, electrical components, etc., can solve the problems of dendrite growth, uneven metal deposition, etc., and achieve adjustable porosity, improved protection, and uniform metal deposition effect

Active Publication Date: 2021-05-28
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problems of uneven metal deposition / dissolution and dendrite growth in the cycle process of existing alkali metal batteries, the first purpose of the present invention is to provide a protection method for alkali metal negative electrodes, which aims to stack The thermally conductive carbon film protective layer obtained by one layer of the process can on the one hand uniform the current density on the electrode surface and facilitate the uniform deposition of metals. On the other hand, the protective layer can serve as a physical barrier to inhibit the further growth of dendrites and avoid Piercing the separator, thereby improving the safety performance of alkali metal batteries

Method used

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  • Protection method of alkali metal negative electrode, negative electrode made and application thereof
  • Protection method of alkali metal negative electrode, negative electrode made and application thereof
  • Protection method of alkali metal negative electrode, negative electrode made and application thereof

Examples

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Embodiment 1

[0058] A mixture obtained by mixing polymer polyimide with graphene after carbonization at 800°C for 2 hours was selected, and then pressed into a film in a hot roller press to obtain a thermally conductive carbon film. The film-forming pressure was 8MPa, and the roller The pressing speed is 0.5 m / min, and the temperature is 400°C. The obtained thermally conductive carbon film was cut into discs with a diameter of 15 mm. The graphene content in the thermally conductive carbon film is 20%, the porosity is 5%, and the thickness is 50 μm. Using metal lithium as the working electrode and copper foil as the counter electrode, add and stack on the surface of metal lithium and cover the surface of metal lithium sheet. (The following cases, unless otherwise stated, the setting of the protective layer is the same as this case) The thermal conductive carbon film is used as the protective layer, with 1M LiTFSI+DOL-DME+2%LiNO 3 The electrolyte is assembled into a button half cell and a ...

Embodiment 2

[0060] Compared with Example 1, the difference is that the content of graphene is changed, specifically:

[0061] A mixture obtained by mixing polymer polyimide with graphene after carbonization at 800°C for 2 hours was selected, and then pressed into a film in a hot roller press to obtain a thermally conductive carbon film. The film-forming pressure was 8MPa, and the roller The pressing speed is 0.5 m / min, and the temperature is 400°C. The obtained thermally conductive carbon film was cut into discs with a diameter of 15 mm. The graphene content in the thermally conductive carbon film is 25%, the porosity is 7%, and the thickness is 50 μm. Use metal lithium as the working electrode, copper foil as the counter electrode, add the thermally conductive carbon film on the surface of metal lithium as a protective layer, and use 1M LiTFSI+DOL-DME+2%LiNO 3 The electrolyte is assembled into a button half cell and a button symmetrical cell. at 0.1mA / cm 2 current density and 1mAh / cm...

Embodiment 3

[0063] Compared with Example 1, the difference is that the film-forming pressure is changed, specifically:

[0064] A mixture obtained by mixing polymer polyimide with graphene after carbonization at 800°C for 2 hours was selected, and then pressed into a film in a hot roller press to obtain a thermally conductive carbon film. The film-forming pressure was 6MPa, and the roller The pressing speed is 0.5 m / min, and the temperature is 400°C. The obtained thermally conductive carbon film was cut into discs with a diameter of 15 mm. The graphene content in the thermally conductive carbon film is 20%, the porosity is 9%, and the thickness is 70 μm. Use metal lithium as the working electrode, copper foil as the counter electrode, add the thermally conductive carbon film on the surface of metal lithium as a protective layer, and use 1M LiTFSI+DOL-DME+2%LiNO 3 The electrolyte is assembled into a button half cell and a button symmetrical cell. at 0.1mA / cm 2 current density and 1mAh / ...

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Abstract

The invention belongs to the technical field of lithium metal batteries, and specifically discloses a protection method for an alkali metal negative electrode. The polymer is cracked to obtain a polymer carbon material, and the polymer carbon material and graphene are mixed and pressed into a film to obtain the heat conducting A carbon film; then the prepared thermally conductive carbon film is stacked on the surface of the alkali metal negative electrode and covers the entire surface of the alkali metal negative electrode to obtain a protectively treated alkali metal negative electrode. The invention also provides the alkali metal negative electrode and the alkali metal battery obtained by the protection method. The method is simple and efficient, and does not change the original battery manufacturing process. After adding the protective layer, the nucleation overpotential of the battery is reduced, and the Coulombic efficiency and cycle stability are improved, which has great practical prospects.

Description

technical field [0001] The invention relates to the technical field of electrochemical energy storage negative electrodes, in particular to a protection method for alkali metal negative electrodes. Background technique [0002] Alkali metals such as lithium, sodium, and potassium are considered ideal anode materials for high-energy secondary batteries due to their high theoretical specific capacity and low electrochemical potential. However, due to the uneven deposition and dissolution of metals during the charging and discharging process of the battery, dendrites grow, which easily cause low Coulombic efficiency, short cycle life and even safety issues, which greatly restrict the use of alkali metals as high energy density secondary batteries. The actual application process of the secondary battery. [0003] At present, in order to solve the dendrite problem in alkali metal anodes, the solution strategies mainly include electrolyte optimization, artificial solid electrolyt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1395H01M4/62H01M4/134H01M10/052H01M10/054
CPCH01M4/134H01M4/1395H01M4/628H01M10/052H01M10/054Y02E60/10
Inventor 张治安谢杨洋高春晖赖延清张凯李劼
Owner CENT SOUTH UNIV
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