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Composite anode material for secondary battery, anode comprising same, and lithium secondary battery

A negative electrode material, secondary battery technology, applied in secondary batteries, battery electrodes, batteries, etc., can solve the problems of difficulty in ensuring graphene, low initial efficiency, graphene application, etc., to improve initial efficiency and improve high-temperature life characteristics , the effect of reducing side reactions

Active Publication Date: 2018-03-27
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, since the above method uses a method of growing graphene on a metal surface, the method has a disadvantage in that additional processing is required to use graphene
In the case of graphene prepared using physical methods, similar to the limitations of chemical vapor deposition methods, there is also the disadvantage that it is difficult to secure a sufficient amount of graphene
A method of producing graphene by reducing graphene oxide prepared by subjecting graphite to acid treatment can obtain a larger amount of graphene than other methods, but the method has a disadvantage in that it is difficult to achieve the characteristics of pure graphene
[0010] Another reason is that for graphene, due to its large specific surface area, obvious side reactions occur with electrolyte solutions, so the initial efficiency may be low and the storage characteristics at high temperatures may be reduced, so the disadvantage is that it is difficult to Applying graphene to practical batteries

Method used

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  • Composite anode material for secondary battery, anode comprising same, and lithium secondary battery
  • Composite anode material for secondary battery, anode comprising same, and lithium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0126] (Preparation of negative electrode)

[0127] Step 1: Preparation of Anode Material

[0128] 0.5 μm thick pure graphene sheets separated from graphite (manufactured by BTR NewEnergy Materials Inc.) and pitch were mixed in a weight ratio of 1:0.1, and the mixture was put into a sintering furnace, It was sintered at 950° C. for about 2 hours, and carbonized to form the pitch-containing first coating layer 13 on both sides of the graphene sheet 11 .

[0129] Next, based on 1 part by weight of the graphene sheet, a copolymer of methyl acrylate and styrene (weight ratio of 0.1) was dissolved in N-methyl-2-pyrrolidone, and the solution was sprayed and coated on Formed on the first coating layer 13 on both sides of the graphene sheet 11 and heat-treated at 400° C. to prepare a second coating layer in which the cured second coating layer was formed on the first coating layer 13 formed on both sides of the graphene sheet 11 . Anode material for layer 15 (see figure 1 ). In t...

Embodiment 2

[0137] A negative electrode, a positive electrode, and a secondary battery comprising the negative electrode and the positive electrode were prepared in the same manner as in Example 1, except that in the negative electrode preparation step of Example 1, a polymer coating layer was formed as the first coating layer. layer, and then a bituminous coating is formed as a second coating.

experiment example 1

[0160] The lithium secondary batteries prepared in Examples 1 and 2 and Comparative Examples 1 to 7 were charged and discharged at 5C / 0.1C for 50 cycles, respectively, and then the capacity retention ratios and outputs thus obtained are presented in the following table 1 in.

[0161] In addition, after storing the lithium secondary batteries prepared in Examples 1 and 2 and Comparative Examples 1 to 7 at a high temperature of 60° C. for 8 weeks, the capacity retention rate was measured, and the results are presented in Table 1 below.

[0162] [Table 1]

[0163]

[0164] As shown in Table 1, regarding the secondary batteries of Examples 1 and 2 using the graphene sheet comprising two coatings of the present invention as the negative electrode material, the capacity retention rate, high temperature storage characteristics and output characteristics after 50 cycles It can be understood that these properties are improved, respectively, being 90% or more.

[0165] That is, with ...

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Abstract

The present invention relates to a composite anode material for a secondary battery, an anode comprising the same, and a lithium secondary battery and, specifically, to a composite anode material fora secondary battery, an anode comprising the same, and a lithium secondary battery, the composite anode material comprising a graphene sheet, and two or more coating layers respectively formed on theboth surfaces of the graphene sheet, wherein the two or more coating layers comprise one or more polymer coating layers and one or more pitch coating layers, and the weight ratio of the graphene sheetto the two or more coating layers is 1 to 0.01-0.1 exclusive.

Description

technical field [0001] CROSS-REFERENCE TO RELATED APPLICATIONS [0002] This application claims the benefit of Korean Patent Application No. 2016-0061365, filed on May 19, 2016, and Korean Patent Application No. 2017-0061875, filed on May 18, 2017, with the Korean Intellectual Property Office, both of which The disclosure of is incorporated herein by reference in its entirety. technical field [0003] The present invention relates to a composite negative electrode material for a secondary battery, and a negative electrode and a lithium secondary battery comprising the material. Background technique [0004] Among currently used secondary batteries, since lithium ion secondary batteries are small in size and light in weight, and because chemical and physical properties are not deteriorated by external and internal influences compared with other batteries, they have excellent energy efficiency, Having cycle stability (long cycle life), lithium-ion secondary batteries hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M4/133H01M4/1393H01M10/0525
CPCH01M4/133H01M4/1393H01M4/587H01M4/621H01M4/625H01M4/628H01M10/0525H01M2220/20H01M4/366Y02E60/10H01M2004/027
Inventor 李秀民申善英金银卿李秀娟朴丽霖
Owner LG ENERGY SOLUTION LTD