Negative electrode surface protection method suitable for solid-state lithium battery and secondary lithium battery
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A secondary lithium battery, solid-state lithium technology, used in battery electrodes, secondary battery repair/maintenance, negative electrodes, etc., can solve problems such as capacity decay, dead lithium, side reactions, etc.
Pending Publication Date: 2021-09-17
天津中电新能源研究院有限公司 +1
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[0004] The problem to be solved by the present invention is to provide a negative electrode surface protection method suitable for solid-state lithium batteries and secondary lithium batteries, which can effectively solve the problem that side reactions easily occur after the surface of the metal lithium negative electrode contacts with the electrolyte, and lithium dendrites are formed on the surface at the same...
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Embodiment 1
[0041] All the preparation processes in this example are carried out in a dry environment with a dew point ≤ 45°C.
[0042] Preparation of polymer film: Add 10.5g of PEO to 25g of acetonitrile to make a film solution, coat it on the surface of polyimide substrate, evaporate the solvent at 80°C, and dry at 60°C for 12 hours under vacuum to obtain a film with a thickness of 12μm. PEO polymer film.
[0043] Transferring the polymer film: the polymer film is then transferred from the substrate to the surface of the metal lithium negative electrode 1 by roll-to-roll rolling.
[0044] Preparation of infiltration solution: add 13gLiTFSI and 7gDOL to 4gTHF and 4gDME in turn to prepare the infiltration solution.
[0045] Preparation of protective layer 2: using a micro-gravure coating process, coating the immersion solution on the surface of the metal lithium negative electrode 1 covered with a PEO polymer film, adjusting the tape speed, oven wind speed and temperature, and then placi...
Embodiment 2
[0047] All the preparation processes in this example are carried out in a dry environment with a dew point ≤ 45°C.
[0048] Preparation of polymer film: 4.66g PAN and 6g LLZTO were sequentially added to 20g DMAC to form a film solution, coated on the surface of polyimide substrate, the solvent was evaporated at 80°C, and then vacuum-dried at 60°C for 12h to obtain PAN and LLZTO composite polymer film (thickness 8 μm).
[0049] Transferring the polymer film: Then, the composite film is transferred from the substrate to the surface of the metal lithium negative electrode 1 by roll-to-roll rolling.
[0050] Prepare the infiltration solution: mix 10g LiTFSI, 2.8g LiNO 3 , 7g DOL were sequentially added to 3gDEC and 4gDME to make the infiltration solution.
[0051] Preparation of protective layer 2: Using an extrusion process, apply the immersion solution on the metal lithium negative electrode 1 covered with a polymer film on the surface. Since the coating equipment used has bee...
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Abstract
The invention provides a negative electrode surface protection method suitable for a solid-state lithium battery and a secondary lithium battery. The negative electrode surface protection method comprises the following steps: adding a polymer or a composite material into an organic solvent to prepare a thin film solution; coating the film solution on the surface of a substrate, and volatilizing and drying for a period of time to obtain a polymer film; transferring the polymer film to the surface of a metal lithium negative electrode; sequentially adding a lithium salt and an additive into an organic solvent according to a certain proportion to prepare an infiltration solution; and coating the metal lithium negative electrode of which the surface is coated with the polymer film with the infiltration solution, infiltrating for a period of time, removing the redundant infiltration solution on the metal lithium negative electrode, and drying for a period of time to obtain the protection layer. The invention has the beneficial effects that the interface side reaction can be effectively inhibited, the current density of the surface of the metal lithium negative electrode is uniform, the generation condition of lithium dendrites in the charging and discharging process is improved, and the cycling stability of the metal lithium negative electrode is improved.
Description
technical field [0001] The invention belongs to the technical field of lithium battery negative electrode surface protection, and in particular relates to a negative electrode surface protection method suitable for solid lithium batteries and secondary lithium batteries. Background technique [0002] As people have higher and higher requirements for the energy density of batteries used in electronic equipment, electric tools, electric vehicles, etc., the energy density of lithium-ion batteries with graphite materials as negative electrodes is close to the theoretical upper limit. Metal lithium anode has become one of the most promising anode materials for high specific energy lithium-ion batteries due to its high specific capacity (3861mAh / g) and lowest electrochemical potential (-3.04V). [0003] At present, the core problem that restricts the application of metal lithium in high specific energy batteries is that the dead lithium and lithium dendrites generated by metal lit...
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