A kind of preparation method of lithium metal battery negative electrode side interlayer material that prevents lithium dendrite

A lithium metal battery, lithium dendrite technology, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of difficult to enlarge preparation, unreasonable structural design, etc., to reduce polarization phenomenon, stabilize peeling capacity, process Simple and effective process

CN111900373BActive Publication Date: 2021-08-06DALIAN UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2021-08-06

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Abstract

The invention discloses a preparation method of a lithium dendrite-proof lithium metal battery cathode side interlayer material. Using polyacrylonitrile and carbon nanotubes as raw materials, a CNT@C composite membrane material that prevents lithium dendrites (CNT@C interlayer material, used as a negative electrode for lithium metal batteries) was obtained by preparing membrane liquid, solvent phase inversion, pre-oxidation, and carbonization Side interlayer material), the CNT@C interlayer material with a sponge pore structure and high conductivity is covered on the lithium sheet to protect the negative electrode of the lithium metal battery and prevent lithium dendrites and battery short circuits. at 8mA h cm ‑2 and 8mA cm ‑2 Under the high plating / stripping capacity and current density, the overpotential of Li / CNT@C electrode is about 0.15V after 500h operation. When LiFePO 4 When the full battery is assembled as the positive electrode, the capacity retention rate of the Li / CNT@C battery after 600 cycles is 82.5%, indicating that the CNT@C interlayer material has a better effect on slowing down the growth of lithium dendrites and prolonging the cycle life of the battery.
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Description

technical field

[0001] The invention relates to the field of interlayers of lithium metal batteries, in particular to a preparation method of an anti-lithium dendrite lithium metal battery negative side interlayer material. Background technique

[0002] The continuous growth of the global economy requires more and more energy. The proven reserves of fossil energy are not optimistic. The carbon dioxide produced by the combustion of fossil fuels causes the global greenhouse effect. Renewable energy such as solar energy and tidal energy can effectively reduce carbon emissions and protect the environment, but unstable and intermittent characteristics limit the utilization of such energy. Therefore, energy storage devices have received more and more attention, especially lithium batteries, which have developed rapidly in recent years.

[0003] Lithium batteries have penetrated into all areas of our lives. Lithium batteries are used in mobile phones, computers, and the hot new en...

Examples

Embodiment 1

[0029] 1) Preparation of CNT@PAN composite membrane material

[0030] Weigh 1g of polyacrylonitrile (PAN), put it in a silk bottle, add 12g of N,N-dimethylformamide (DMF), stir for 30min, add 1g of carbon nanotubes (CNT), N,N-dimethylformamide The mass ratio of base formamide, carbon nanotubes and polyacrylonitrile is 12:1:1. Put the silk bottle in an oil bath, stir at 60-80°C for 8-12h, and form a uniform and viscous black casting solution. After the casting solution was cooled to room temperature, an automatic coating machine was used to coat the casting solution on a dry and clean glass plate to form a liquid film with a thickness of 200 μm. The glass plate was quickly transferred to n-pentanol, and the CNT@PAN composite film was formed based on the principle of phase inversion. After soaking for 24 hours, it was taken out to dry, and then transferred to a vacuum drying oven, and vacuum-dried at 90°C for 4 hours to remove the CNT@PAN composite film. remaining n-pentanol. ...