Graphene-coated lithium ion battery and preparation method thereof

A lithium ion battery, graphene coating technology, applied in the manufacture of electrolyte batteries, battery electrodes, secondary batteries, etc., can solve difficult battery system coordination, low lithium ion conductivity and electronic conductivity, and material specific capacity Less than the theoretical specific capacity polarization phenomenon and other problems, to achieve the effect of improving ionic conductivity, stable cycle performance, and improving electronic conductivity

Pending Publication Date: 2022-05-10
牛墨石墨烯应用科技有限公司
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] LiFePO 4 The positive electrode material mainly stores and releases electric energy by inserting and extracting lithium ions through the layered structure, but LiFePO 4 The intrinsic lithium ion conductivity and electronic conductivity are low, which leads to the specific capacity of the material not reaching the theoretical specific capacity and the polarization phenomenon during rapid charge and discharge.
In the prior art, LiFePO is mostly improved by reducing the material particle size, coating with activated carbon, or doping other substances. 4 It is difficult to further promote the coordination of the overall battery system based on the performance of the material itself.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Graphene-coated lithium ion battery and preparation method thereof
  • Graphene-coated lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] This embodiment discloses a preparation method of a graphene-coated lithium ion battery, comprising the following steps:

[0044] S1. Preparation of LiFeO 4 / Graphene modified composite materials;

[0045] LiFeO in S1 4 The preparation method of / graphene modified composite material comprises the following steps:

[0046] S11, the LiOH·H 2 O was dissolved in deionized water under magnetic stirring; completely dissolved;

[0047] S12, under the condition of stirring, add H dropwise to the mixed solution obtained in S11 3 PO 4 , until a white suspension is added to the solution;

[0048] S13, dispersing the ethylenediamine-modified graphene oxide in deionized water, mixing and dispersing evenly;

[0049] S14, the FeSO 4 ·7H 2 O is dissolved in the mixed solution obtained in step S13, and mixed uniformly;

[0050]S15, adding the mixed solution obtained in S14 to the mixed solution obtained in S12, stirring evenly and continuing to stir for a certain period of tim...

Embodiment 2

[0067] The main difference between this embodiment and embodiment 1 is:

[0068] Before S11 is carried out, graphene oxide is grafted with polystyrene through esterification reaction, and the specific dosage is shown in Table 1;

[0069] In the S17, after vacuum drying and high-temperature calcination, the precipitated substance is removed from polystyrene to obtain LiFeO with porous channels. 4 / Graphene modified composite materials.

[0070] The process condition of preferred high temperature calcination is:

[0071] Calcination temperature: 350°C to 500°C; Argon protection. The specific high-temperature calcination process conditions are shown in Table 2.

Embodiment 3

[0073] The main difference between this embodiment and embodiment 1 is:

[0074] Before S11 is carried out, graphene oxide is grafted with polystyrene through esterification reaction, and the specific dosage is shown in Table 1;

[0075] In the S17, after vacuum drying and high-temperature calcination, the precipitated substance is removed from polystyrene to obtain LiFeO with porous channels. 4 / Graphene modified composite materials.

[0076] The specific high-temperature calcination process conditions are shown in Table 2.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a preparation method of a graphene-coated lithium ion battery. The preparation method comprises the following steps: S1, preparing a LiFeO4 / graphene modified composite material; s2, mixing the obtained LiFeO4 / graphene modified composite material and polyvinylidene fluoride according to a certain mass ratio, coating an aluminum foil with the mixture, drying, and cutting to obtain a positive plate; s3, combining a diaphragm, an electrolyte and a negative electrode to form a battery; the invention also discloses the lithium ion battery obtained by the method. According to the invention, by effectively constructing the cooperation of graphene and LiFePO4, the dynamic performance of a battery system is improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a graphene-coated lithium-ion battery and a preparation method. Background technique [0002] The olivine-structured lithium iron phosphate crystal structure belongs to the cubic crystal system, in which the oxygen atoms occupy the 4c ​​and 8d positions of the framework in the form of hexagonal stacking; the lithium and iron atoms respectively occupy the 4a and 4c positions in the octahedral gap of the material framework; finally The phosphorus atom is located at the tetrahedral interstitial 4c position in the crystal structure. [0003] LiFePO 4 The positive electrode material mainly stores and releases electric energy by inserting and extracting lithium ions through the layered structure, but LiFePO 4 The intrinsic lithium ion conductivity and electronic conductivity are low, which leads to the specific capacity of the material not reaching the theoretical speci...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/58H01M4/36H01M10/0525H01M10/058
CPCH01M4/625H01M4/5825H01M4/362H01M10/0525H01M10/058H01M2004/028Y02P70/50
Inventor 陈大波杨跃仁
Owner 牛墨石墨烯应用科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap