Metal negative electrode and preparation method thereof, electrochemical battery and terminal
A metal anode and alkali metal salt technology, applied in the field of electrochemical cells, can solve the problems of large volume expansion, uneven metal deposition on the surface of the metal anode, dendrite growth, etc., to stabilize the anode interface, improve the coulombic efficiency of the anode, and reduce the concentration of The effect of differential polarization
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[0065] Correspondingly, an embodiment of the present invention also provides a method for preparing a metal negative electrode, comprising:
[0066] The single ion conductor polymer alkali metal salt is added to the organic solvent, and then the obtained dispersion is coated on one or both sides of the metal negative electrode body to form a protective layer, wherein the single ion conductor polymer alkali metal salt includes a polymer The backbone and the sulfonimide rubidium salt or the sulfonimide cesium salt grafted on the polymer backbone by chemical bonds.
[0067] In the embodiment of the present invention, the single-ion conductor polymer alkali metal salt is the single-ion conductor polymer alkali metal salt described in any one of the foregoing embodiments, and details are not repeated here.
[0068] In the embodiment of the present invention, the organic solvent can be nitrogen methyl pyrrolidone, acetone, acetonitrile, ethanol, dimethyl carbonate, ethyl methyl carb...
Example Embodiment
[0079] Example 1
[0080] The present embodiment provides a metal lithium negative electrode protected by poly(propylenesulfonyl)(trifluoromethylsulfonyl)imide cesium (A), and the preparation method thereof includes:
[0081] In a drying room, 10g of poly(propylenesulfonyl)(trifluoromethylsulfonyl)imide cesium (A) and 0.2g of polyvinylidene fluoride (PVDF) were added to 100g of dimethyl ether, stirred and mixed into a slurry . Then, the above slurry was coated on the surface of the unprotected metal lithium by brushing, and the brushing time was 10 min to obtain a poly(acrylsulfonyl)(trifluoromethylsulfonyl)imide cesium protective layer with a thickness of 2 μm.
Example Embodiment
[0082] Embodiment 2
[0083] The present embodiment provides a metal lithium negative electrode protected by poly(propylenesulfonyl)(perfluorobutylsulfonyl)imide rubidium (B), and the preparation method thereof includes:
[0084] In a drying room, 20g of poly(propylenesulfonyl)(perfluorobutylsulfonyl)imide rubidium and 0.2g of polyvinylidene fluoride (PVDF) were added to 100g of ethylene glycol dimethyl ether, stirred and mixed into a slurry . Then, the above slurry was coated on the surface of unprotected metal lithium by blade coating, and the blade coating time was 2 min to obtain a poly(acrylonylsulfonyl)(perfluorobutylsulfonyl)imide rubidium protective layer with a thickness of 3 μm.
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