Lightweight high-conductivity flexible lithium battery current collector material, and preparation method and application thereof
A technology of high conductivity and current collectors, which is applied in the direction of battery electrodes, secondary batteries, electrode carriers/current collectors, etc., can solve the problems of impractical application of batteries, low initial Coulombic efficiency, and incompatible preparation processes, etc., and achieve long-term cycle improvement. Good performance, soft performance, and the effect of improving the rate performance
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[0020] A method for preparing a light-weight, highly conductive flexible lithium battery current collector material, comprising the following steps:
[0021] Step 1. After dispersing the graphene oxide filter cake in deionized water, obtain the graphene oxide gel after rotating for 1-12 hours;
[0022] Step 2. The graphene oxide gel is obtained by scraper coating, self-assembly, rotary centrifugation and other methods, and the thickness of the film is controlled to be 50-150 μm, and then the graphene oxide gel film is placed at room temperature to dry naturally 6-72 hours to obtain a graphene oxide film;
[0023] Step 3. Put the graphene oxide film in a high-temperature furnace, slowly heat it to 1300°C in a high-temperature furnace with an Ar atmosphere, maintain it for 2 hours, then slowly raise the temperature to 3000°C, and keep it at 3000°C for 1 hour to obtain a lightweight and highly conductive Reduced graphene oxide film.
[0024] The solid content of graphene oxide ...
Embodiment 1
[0031] (1) Preparation of silicon carbon negative electrode sheet for lithium ion battery:
[0032] The negative electrode slurry consisting of silicon carbon, acetylene black, and binder mixture (styrene butadiene rubber, SBR, and carboxymethyl cellulose, CMC) in a mass ratio of 8:1:1 was dissolved in deionized water, and coated on a copper foil or a graphene film, and then dried in a vacuum oven at 100° C. for 10 hours to obtain a silicon-carbon negative electrode sheet.
[0033] (2) Assembly of lithium-ion half-cells and full-cells:
[0034] In an argon-filled glove box (H 2 O2 CR2032 coin cells assembled in <0.1p.p.m.). The assembly of the half-cell is based on the prepared electrode sheet as the working electrode and the metal lithium sheet as the reference electrode. The electrolyte used for the negative half-cell was LBC3401A4, and the separator was Celgard 2400.
[0035] (3) Lithium-ion battery test:
[0036] First cycle the battery at 25 μA for 3 cycles to activate...
Embodiment 2
[0039] (1) Preparation of graphite negative electrode sheet for lithium ion battery:
[0040] The negative electrode slurry consisting of graphite, acetylene black and binder mixture (styrene butadiene rubber, SBR and carboxymethyl cellulose, CMC) at a mass ratio of 8:1:1 was dissolved in deionized water and coated with cloth on copper foil or graphene film, and then dry in a vacuum oven at 100° C. for 10 hours to obtain a graphite negative electrode sheet.
[0041] (2) Assembly of lithium-ion half-cells and full-cells:
[0042] In an argon-filled glove box (H 2 O2 CR2032 coin cells assembled in <0.1p.p.m.). The assembly of the half-cell is based on the prepared electrode sheet as the working electrode and the metal lithium sheet as the reference electrode. The electrolyte used for the negative half-cell was LBC3401A4, and the separator was Celgard 2400.
[0043] (3) Lithium-ion battery test:
[0044] First cycle the battery at 25 μA for 3 cycles to activate the battery. ...
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