Electrode material lithium supplementing additive, preparation method and application thereof and lithium ion battery

A lithium-ion battery and electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as difficult storage, air sensitivity, and complicated preparation process

Active Publication Date: 2021-04-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the defects of complex preparation process of electrode material lithium supplement additives in the prior art, being

Method used

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  • Electrode material lithium supplementing additive, preparation method and application thereof and lithium ion battery
  • Electrode material lithium supplementing additive, preparation method and application thereof and lithium ion battery
  • Electrode material lithium supplementing additive, preparation method and application thereof and lithium ion battery

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preparation example Construction

[0037] The second aspect of the present invention provides a preparation method of an electrode material lithium supplement additive, the method comprising:

[0038] (1) polymer lithium salt, carbon source and solvent are mixed;

[0039] (2) performing solid-liquid separation on the material obtained by mixing step (1);

[0040] (3) heat-treating the solid matter obtained by the solid-liquid separation.

[0041] According to the present invention, the selection of the lithium polymer salt is as described above, and will not be repeated here.

[0042] Wherein, the lithium polymer salt can be obtained commercially or by preparation, which is not particularly limited in the present invention. For example, the lithium polypropionate can be obtained by reacting polyacrylic acid and lithium salt (preferably lithium hydroxide). The lithium polymethylpropionate can be obtained by reacting polymethacrylic acid and lithium salt (preferably lithium hydroxide). The polylithium maleate...

specific Embodiment approach

[0049] According to a specific embodiment of the present invention, the method includes, after the mixing in step (1), performing solid-liquid separation on the mixed material, and performing the heat treatment on the solid obtained from the solid-liquid separation. The separation can be a conventional separation method in the art, such as centrifugation.

[0050] According to a specific embodiment of the present invention, the method further includes drying the solid matter before the heat treatment, preferably, the drying temperature is 80-150° C., and the drying time is 2-8 hours.

[0051] According to the present invention, preferably, the conditions of the heat treatment include: the temperature is 550-700°C, and the time is 0.5-2h; more preferably, the temperature is 600-650°C.

[0052] The present invention has no special limitation on the heating rate of the heat treatment, for example, it may be 1-10° C. / min. In the embodiment of the present invention, 5° C. / min is t...

preparation example 1

[0070] Take 10 g of polyacrylic acid with a weight average molecular weight of 240,000 and add it to 40 g of deionized water to prepare a polyacrylic acid solution with a mass fraction of 20%. Weigh 3.4g of lithium hydroxide, add it to the above polyacrylic acid solution, heat and stir at 40°C until all solids are dissolved, and dry at 100°C for 4h to obtain lithium polyacrylate-1.

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Abstract

The invention relates to the field of lithium ion batteries, and discloses an electrode material lithium supplement additive, a preparation method and application thereof, and a lithium ion battery, the electrode material lithium supplement additive comprises polymer lithium salt and a carbon film coating the surface of the polymer lithium salt. The preparation method of the electrode material lithium supplementing additive comprises the following steps: (1), mixing polymer lithium salt, a carbon source and a solvent; (2), carrying out solid-liquid separation on the material obtained by mixing in the step (1); and (3), carrying out heat treatment on the solid substance obtained by solid-liquid separation. The electrode material lithium supplement additive provided by the invention is convenient to store, has no special requirements on use conditions, and can improve the specific capacity of the material when being used in the electrode material.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an electrode material lithium supplement additive, a preparation method and application thereof, and a lithium ion battery. Background technique [0002] The theoretical specific capacity of silicon base material is 4200mA·h·g -1 , is currently the anode material with the highest gram capacity. Once successfully applied, it can significantly increase the energy density of lithium batteries, making it possible for a battery life of 1,000 kilometers on a single charge. However, the charging and discharging mechanism of silicon is different from that of graphite. During the charging and discharging process, Si and Li in the electrolyte + A solid electrolyte (SEI) film will be continuously formed at the interface. The formation of this irreversible SEI consumes a large amount of Li released from the electrolyte and the positive electrode material, resulting in the firs...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M4/60H01M4/62H01M10/0525
CPCH01M4/366H01M4/583H01M4/602H01M4/625H01M10/0525Y02E60/10
Inventor 孙赛张丝雨高焕新张同宝
Owner CHINA PETROLEUM & CHEM CORP
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