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Method for pre-deposition, modification and modification of sei-like film on the surface of carbonaceous material

A technology of modification and carbon, which is applied in the direction of structural parts, electrical components, battery electrodes, etc., can solve the problems of natural graphite solvent embedding, affecting material cycle performance, and affecting battery cycle life, etc. The effect of improving cycle stability, improving first-time efficiency and cycle life

Active Publication Date: 2021-01-22
SHANGHAI SHANSHAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unmodified carbon-based anode materials face many problems in energy storage applications: 1) Graphene materials are prone to agglomeration due to their high specific surface area, which affects battery capacity; 2) SEI membranes formed during cycling 3) Natural graphite is prone to solvent embedding, which affects the cycle performance of the material

Method used

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  • Method for pre-deposition, modification and modification of sei-like film on the surface of carbonaceous material
  • Method for pre-deposition, modification and modification of sei-like film on the surface of carbonaceous material
  • Method for pre-deposition, modification and modification of sei-like film on the surface of carbonaceous material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1. Raw material preparation:

[0036] Reaction system solvent: 40ml dimethyl carbonate;

[0037] Carbon energy storage material: 0.2g graphene, prepared by modified Hummer method;

[0038] 2. Raw material mixing:

[0039] Put the graphene into a 50ml PTFE reactor, then add the solvent of the reaction system, sonicate for 15min, and stir for 30min.

[0040] 3. Heating reaction:

[0041] The reaction kettle was sealed, placed in a blast drying oven at 100°C, and reacted for 120 minutes.

[0042] 4. Centrifugal separation:

[0043] The reactant obtained after heating and reacting is taken out after cooling and centrifuged, and the modified graphene sample is obtained by separation;

[0044] 5. Cleaning:

[0045] Wash with absolute ethanol 2-3 times;

[0046] 6. Drying:

[0047] Vacuum drying at 80°C to obtain a modified graphene product.

[0048] In this example, the prepared graphene raw material and SEI-like film surface modified graphene were detected by TEM, a...

Embodiment 2

[0052] 1. Raw material preparation:

[0053] Reaction system solvent: 40ml dimethyl carbonate;

[0054] Carbon energy storage material: 1g of natural graphite sold in the market, see Figure 5 ;

[0055] 2. Raw material mixing:

[0056] Put the natural graphite into a 50ml PTFE reactor, add dimethyl carbonate, sonicate for 15min, and stir for 30min.

[0057] 3. Heating reaction:

[0058] Then the reaction kettle was sealed and placed in a blast oven at 100°C for 60 minutes of reaction.

[0059] 4. Centrifugal separation:

[0060] The reactant obtained after the heating reaction is cooled, taken out and centrifuged, and separated to obtain a modified natural graphite sample;

[0061] 5. Cleaning:

[0062] Wash with absolute ethanol 2-3 times;

[0063] 6. Drying:

[0064] Vacuum drying at 80°C to obtain a modified natural graphite product.

[0065]According to the ratio of modified natural graphite products: CMC: SBR: SP = 95.5: 1.5: 1.5: 1.5, the slurry is prepared, c...

Embodiment 3

[0069] 1. Raw material preparation:

[0070] Reaction system solvent: 40ml dimethyl carbonate;

[0071] Carbon energy storage materials: 1g of artificial graphite sold in the market;

[0072] 2. Raw material mixing:

[0073] Graphene was put into a 50ml PTFE reactor, and then dimethyl carbonate was added, ultrasonicated for 15min, and stirred for 30min.

[0074] 3. Heating reaction:

[0075] The reaction kettle was sealed, placed in a blast drying oven at 100°C, and reacted for 120 minutes.

[0076] 4. Centrifugal separation:

[0077] The reactant obtained after the heating reaction is cooled, taken out and centrifuged, and separated to obtain a modified artificial graphite sample;

[0078] 5. Cleaning:

[0079] Wash with absolute ethanol 2-3 times;

[0080] 6. Drying:

[0081] Vacuum drying at 80°C to obtain a modified artificial graphite product.

[0082] According to the modified artificial graphite product: CMC: SBR: SP = 95.5: 1.5: 1.5: 1.5, the slurry is prepare...

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Abstract

The invention relates to the technical field of modification of carbon material, and in particular relates to a pre-deposition modification method for a quasi-SEI film on the surface of carbon material. The method is characterized by comprising the following steps of 1, preparation of raw materials, which specifically includes using an organic solvent component forming electrolyte as a reaction system solvent, and using carbon energy storage material as modification material; 2, mixing of the raw materials; 3, heating reaction; 4, centrifugal separation; 5, cleaning and 6, drying. Compared with the prior art, the method provided by the invention is simple in process, adopts a low temperature solvent thermal reaction to perform surface pre-deposition quasi-SEI film modification, and is mild and simple in technological conditions and good in reproducibility; according to the method, a layer of compact quasi-SEI film components can be integrally and uniformly deposited on the surface of each of various kinds of carbon material, direct contact between the carbon material and the electrolyte can be reduced, generation of an SEI film can be reduced, and primary efficiency, cycle performance and high temperature storage performance of the material can be enhanced.

Description

technical field [0001] The invention relates to the technical field of modification of carbonaceous materials, in particular to a method for pre-depositing, modifying and modifying an SEI-like film on the surface of carbonaceous materials. Background technique [0002] Lithium-ion battery, as a new type of rechargeable battery, has the advantages of high energy density, no memory effect, green and environmental protection, and is considered to be "the most promising ideal energy source in the 21st century". In recent years, lithium-ion batteries have been widely used in notebook computers, digital cameras, various portable electronic products, electric vehicles and energy storage devices. With the continuous improvement of the requirements for fast charging performance and battery life of various devices, the selection and process modification of lithium-ion battery anode materials have become the focus of material research and development. [0003] The current lithium-ion ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/0525
CPCH01M4/366H01M4/587H01M4/628H01M10/0525Y02E60/10
Inventor 吴仙斌张华朱丽萍李富营苗荣荣曾冬青孙文婷
Owner SHANGHAI SHANSHAN TECH CO LTD