Lithium ion battery cathode additive and preparation method thereof, lithium ion battery cathode piece and lithium ion battery
A lithium-ion battery and additive technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, batteries, etc., can solve problems such as harsh process conditions, impact on performance, and reduced initial capacity of lithium-ion batteries, and achieve easy industrial production and low cost Effect
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[0042] In the second aspect, an embodiment of the present invention provides a method for preparing a negative electrode additive for a lithium ion battery, which includes the following steps: dissolving a polymer in a carbonate solvent to form a polymer solution, and putting elemental lithium powder into the polymer solution; After stirring evenly, it is filtered, the filter residue is taken, and the filter residue is spray-dried at a temperature of 50-80 ℃ under the protection of inert gas to prepare a lithium ion battery negative electrode additive. The lithium ion battery negative electrode additive is composed of elemental lithium powder and coated in The core-shell coating structure formed by the polymer on the surface of the elemental lithium powder, the polymer cannot be combined with N,N-dimethylformamide, N,N-dimethylacetamide, and N-2-methylpyrrolidone , Tetrahydrofuran, acetone and methanol react.
[0043] The polymer can be dissolved in a carbonate solvent, and the c...
Example Embodiment
[0059] Example one
[0060] A method for preparing a negative electrode additive for a lithium ion battery includes the following steps:
[0061] Dissolve 25 grams of polypropylene carbonate with a weight average molecular weight of 50000 in 200 grams of ethyl methyl carbonate (EMC) to form a polymer solution, stir at low speed for 15 minutes, put 10 g of elemental lithium powder into the polymer solution, and stir for 30 Minutes, filter, take the filter residue, wash with deionized water, and then spray-dry the filter residue at 80°C under the protection of argon at 70°C to prepare the negative electrode additive for lithium ion battery.
[0062] The negative electrode additive of the lithium ion battery is a core-shell coating structure formed by elemental lithium powder and a polymer coated on the surface of the elemental lithium powder.
[0063] Preparation of negative plate for lithium ion battery
[0064] Add 25 g of polyvinylidene fluoride (PVDF) to 500 g of N-2-methylpyrrolidon...
Example Embodiment
[0069] Example two
[0070] A method for preparing a negative electrode additive for a lithium ion battery includes the following steps:
[0071] Dissolve 25 grams of polyethylene oxide with a weight average molecular weight of 50,000 in 200 grams of dimethyl carbonate (DMC) to form a polymer solution, stir at low speed for 15 minutes, put 10g of elemental lithium powder into the polymer solution, stir For 30 minutes, filter, take the filter residue, wash with deionized water, and then spray-dry the filter residue at 70°C under the protection of argon at 60°C to prepare the negative electrode additive for lithium ion battery.
[0072] The negative electrode additive of the lithium ion battery is a core-shell coating structure formed by elemental lithium powder and a polymer coated on the surface of the elemental lithium powder.
[0073] Preparation of negative plate for lithium ion battery
[0074] Add 25 g of polyvinylidene fluoride (PVDF) to 500 g of N-2-methylpyrrolidone (NMP) and s...
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