Metallic lithium anode and preparation method thereof and all-solid-state lithium ion battery
A metal lithium and metal lithium sheet technology, applied in battery electrodes, secondary batteries, solid electrolytes, etc., can solve the problems of lithium dendrite affecting battery cycle life, low conductivity of interface layer affecting lithium ion transmission, etc. The probability of occurrence of pore defects, good lithium ion conductivity, the effect of improving safety performance and cycling performance
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[0042] In some embodiments of the present invention, the preparation method comprises the following steps:
[0043] S1) using lithium phosphate as a target material, using a mixed gas of argon and nitrogen as a working gas, and depositing a LiPON film layer on the first surface and / or the second surface of the metal lithium sheet by magnetron sputtering;
[0044] S2) Using lithium fluoride as a target material and argon as a working gas, a LiF film is deposited on the surface of the LiPON film by magnetron sputtering.
[0045] With Li 3 PO 4 As the target, the Li 3 PO 4 Nitrogen doping to obtain a LiPON film, using this method can effectively control the thickness of the deposited LiPON film and the doping amount of nitrogen, thereby obtaining a high-purity LiPON film, further improving the conductivity of the LiPON film, thereby Further improve the cycle stability and rate performance of lithium-ion batteries.
[0046] During the magnetron sputtering process, the sputter...
Embodiment 1
[0056] This embodiment is a metal lithium negative electrode, which is prepared by the following method:
[0057] S1) Using commercial lithium metal foil with a thickness of 1000 μm as the raw material, adjust the width of the hot press roller to 50 μm in the argon glove box, put the metal lithium foil from the entrance, turn on the hot press, and set the hot press The temperature of the two pressing rollers is 120°C, and the metal lithium foil is stretched and thinned by 50 μm through the roller pressing gap through the mechanical drive, and a 50 μm metal lithium sheet is obtained at the exit;
[0058] S2) Place the metal lithium sheet with a thickness of 50 μm obtained in step S1) on the base of the VTC-600-3HD three-target magnetron sputtering apparatus (Shenyang Kejing), fix the metal lithium sheet with metal fixtures, etc., and place solid phosphoric acid Lithium target and lithium fluoride target at the sputtering target position;
[0059] S3) Close the sputtering machi...
Embodiment 2
[0066] This embodiment is a metal lithium negative electrode, which is prepared by the following method:
[0067] S1) Using a commercial lithium metal foil with a thickness of 500 μm as the raw material, adjust the roller slit width of the hot press to 40 μm in an argon glove box, put the lithium metal foil from the entrance, turn on the hot press, and set the hot press The temperature of the two pressing rollers is 80°C, and the metal lithium foil is stretched and thinned by 40 μm through the roller pressing gap through mechanical drive, and a 40 μm metal lithium sheet is obtained at the exit;
[0068] S2) Place the metal lithium sheet with a thickness of 40 μm obtained in step S1) on the base of the VTC-600-3HD three-target magnetron sputtering instrument (Shenyang Kejing), fix the metal lithium sheet with metal fixtures, etc., and place solid phosphoric acid Lithium target and lithium fluoride target at the sputtering target position;
[0069] S3) Close the sputtering mach...
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Abstract
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