Lithium ion battery containing graphene/cellulose composite material, and preparation method thereof

A lithium-ion battery, composite material layer technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of battery cycle performance impact, increase battery weight, etc., achieve high cycle capacity and cycle stability, improve capacity, The effect of suppressing the growth of dendrites

Active Publication Date: 2018-12-04
BEIJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the currently selected materials can effectively reduce the formation of dendrites, they have a great impact on the cycle performance of the battery and will also significantly increase the weight of the battery.

Method used

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  • Lithium ion battery containing graphene/cellulose composite material, and preparation method thereof
  • Lithium ion battery containing graphene/cellulose composite material, and preparation method thereof
  • Lithium ion battery containing graphene/cellulose composite material, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] Step 1) fully mix natural flake graphite 60g and ethyl cellulose 100g, and ball mill 5h at room temperature to obtain composite graphene cellulose material powder;

[0079] Step 2) Sodium dodecylbenzene sulfonate 25g is dissolved in 460mL water, then the graphene cellulose material 160g obtained in step 1) is dissolved in the above-mentioned water, fully stirred, and the graphene / cellulose composite slurry is obtained;

[0080] Step 3) Preparation of positive electrode of battery

[0081] Preparation of the positive electrode sheet: 85 parts of the positive active material lithium cobaltate, 5 parts of acetylene black, 5 parts of conductive graphite, and 5 parts of PVDF are fully mixed with N-methylpyrrolidone to obtain the positive electrode slurry, which is evenly coated on the surface of the aluminum foil current collector to complete Preparation of positive electrode sheet;

[0082] Coating the graphene / cellulose composite slurry obtained in step 2) on the surface ...

Embodiment 2

[0090] Repeat embodiment 1, difference is:

[0091] Step 1) fully mix natural flake graphite 30g and ethyl cellulose 100g, and ball mill 5h at room temperature to obtain composite graphene cellulose material powder;

[0092] Step 2) dissolving 15g of methyl amyl alcohol in 1500mL water, then dissolving 145g of the graphene cellulose material obtained in step 1) in the above-mentioned water, fully stirring to obtain a graphene / cellulose composite slurry;

[0093] In step 3), the thickness of the mixed slurry coating on the surface of the positive electrode is 0.5 μm;

[0094] In step 4), the thickness of the mixed slurry coating on the surface of the negative electrode is 1 μm;

Embodiment 3

[0096] Repeat embodiment 1, difference is:

[0097] Step 1) fully mix crystalline graphite 10g and ethyl cellulose 100g, and ball mill 5h at room temperature to obtain composite graphene cellulose material powder;

[0098] Step 2) Sodium lauryl sulfate 0.3g is dissolved in 3700mL water, then the graphene cellulose material 11g obtained in step 1) is dissolved in the above-mentioned water, fully stirred, and the graphene / cellulose composite slurry is obtained;

[0099] In step 3), the positive electrode pole piece is not coated with the mixed slurry.

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Abstract

The invention discloses a negative electrode and a positive electrode for a lithium ion battery, and the lithium ion battery and a preparation method thereof. The negative electrode comprises a negative plate and a graphene / cellulose composite material layer on one side surface of the negative plate. The positive electrode comprises a positive plate and a graphene / cellulose composite material layer on one side surface of the positive plate. The graphene / cellulose composite material layer comprises graphene and cellulose. A coating can effectively inhibit the growth of dendritic crystals on thesurface of the negative plate so as to improve the cycle performance and safety performance of the battery; and the coating can effectively reduce the direct internal interface resistance of the surface of the positive and negative plates and an electrolyte so as to enhance the capacity of the corresponding battery. The lithium ion battery prepared by using the negative electrode and / or the positive electrode has high cycle capacity and cycle stability and good cycle safety. The preparation method for the lithium ion battery is simple in process, mild in reaction conditions, short in production cycle, and capable of realizing large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a lithium-ion battery containing a graphene / cellulose composite material and a preparation method thereof. Background technique [0002] Lithium-ion batteries rely primarily on the movement of lithium ions between the positive and negative electrodes to function. During the charging and discharging process, Li + Intercalation and deintercalation back and forth between two electrodes: when charged, Li + It is deintercalated from the positive electrode, inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. [0003] Lithium-ion batteries generally use materials containing lithium elements as electrodes, which are representatives of modern high-performance batteries. It is favored by researchers for its small size, light weight, high working voltage, high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/60H01M10/0525
CPCH01M4/362H01M4/583H01M4/60H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 周建军胡志宇李林方芳
Owner BEIJING NORMAL UNIVERSITY
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