Modification method of metal lithium negative electrode material for lithium secondary battery and modified metal lithium negative electrode material
A negative electrode material, metal lithium technology, applied in the direction of secondary batteries, secondary battery repair/maintenance, battery electrodes, etc., can solve problems such as lithium dendrites are easy to generate, to inhibit the growth of lithium dendrites, overcome high costs, increase The effect of a large contact area
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[0029] According to a preferred embodiment of the present invention, the thickness of the metal lithium particle layer is 300-1500 μm, preferably 500-1300 μm. When the metal lithium particle layer is too thick, the excessive specific surface area increases the side reaction between the electrode and the electrolyte, which is not conducive to the increase of the coulombic efficiency of the battery; when the metal lithium particle layer is thin, the electrode and the electrolyte are reduced. The wettability is not conducive to the migration of lithium ions at the interface.
[0030] In the present invention, the thickness of the lithium metal particle layer is observed by a high-power scanning electron microscope.
[0031] According to a preferred embodiment of the present invention, the lithium metal particles in the lithium metal particle layer are in block shape. The blocks may be regular or irregular, which is not particularly limited in the present invention. Preferably, ...
Embodiment 1
[0068] This example is used to illustrate the modification method and the modified lithium metal negative electrode material for a lithium secondary battery provided by the present invention.
[0069] (1) Under the atmosphere of high-purity argon (99.999% by volume, commercially available), mix 0.08g of ammonium bifluoride with 10g of dimethyl sulfoxide (purity greater than 99.9% by weight), and stir for 8h at 25°C. Be 800r / min, obtain pretreatment liquid;
[0070] (2) Immerse the lithium sheet from which the surface passivation layer has been removed in the pretreatment solution, and react at 25°C for 24h under stirring conditions (800r / min);
[0071] (3) The solid matter obtained from the reaction in step (2) was taken out, and dried at 25° C. for 2 h under the condition of argon flow (the flow rate of argon gas was 2.5 L / min), to obtain metal lithium negative electrode material S1.
[0072] SEM and XRD test and analysis were carried out on metal lithium anode material S1, ...
Embodiment 2
[0076] This example is used to illustrate the modification method and the modified lithium metal negative electrode material for a lithium secondary battery provided by the present invention.
[0077] (1) Under the atmosphere of high-purity argon (99.999% by volume, commercially available), mix 0.04g of ammonium bifluoride with 10g of dimethyl sulfoxide (purity greater than 99.9% by weight), and stir for 8h at 25°C. Be 800r / min, obtain pretreatment liquid;
[0078] (2) Immerse the lithium sheet from which the surface passivation layer has been removed in the pretreatment solution, and react at 30°C for 18 hours under stirring conditions (800r / min);
[0079] (3) The solid matter obtained from the reaction in step (2) was taken out, and dried at 25° C. for 2 h under the condition of argon flow (the flow rate of argon gas was 2.5 L / min), to obtain metal lithium negative electrode material S2.
[0080] SEM and XRD test and analysis were carried out on the metallic lithium negativ...
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Abstract
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