Lithium ion battery containing high-thermal-conductivity and high-conductivity phase change composite material and conductive agent

A phase change composite material, lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of slow heat dissipation, battery life impact, insecurity, etc., achieve high thermal conductivity and high electrical conductivity, and avoid safety. Hidden danger, effect of high thermal conductivity

Inactive Publication Date: 2016-03-16
SHANGHAI AEROSPACE POWER TECH
View PDF4 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the high specific energy positive electrode material has relatively high energy density, its thermal stability is not ideal, and it is very unsafe to use at high temperature, especially when the internal temperature of the battery is too high during the abuse test, it is difficult to guarantee the safety of the battery. During normal use, the temperature will rise, especially in summer, the battery temperature is high and heat dissipation is slow, which will affect the service life of the battery
[0003] The existing safety technology mainly uses flame retardant additives in the electrolyte, safety valves in the battery structure design, and ceramic diaphragms as measures for flame and explosion protection. However, when the abuse test is performed, the internal temperature of the battery is still too high and cannot be guaranteed Single battery safety
In terms of heat dissipation of the single battery, the structural design of the cover plate is basically optimized, and the heat generation is reduced by reducing the internal resistance of the pole. However, the heat generated by charging and discharging between the internal pole pieces of the single battery cannot be effectively diffused, resulting in the battery operating temperature being still too high. High, ultimately affecting battery life

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
  • Lithium ion battery containing high-thermal-conductivity and high-conductivity phase change composite material and conductive agent
  • Lithium ion battery containing high-thermal-conductivity and high-conductivity phase change composite material and conductive agent
  • Lithium ion battery containing high-thermal-conductivity and high-conductivity phase change composite material and conductive agent

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0032] The preparation method of the lithium-ion battery containing the high-conductivity and high-thermal-conduction phase-change composite material provided by the present invention comprises the following steps:

[0033] Step 1, add the phase change material into the graphene oxide solution, heat until the phase change material melts, and then ultrasonically disperse for 2~4 hours to obtain a stable emulsion of graphene oxide wrapped phase change material, and then add sulfuric acid to the above emulsion to adjust the pH to 2 ~3, make graphene oxide condense, cool to form capsules and separate out to obtain graphene oxide phase-change nanocapsules, the capsule wall of which is graphene oxide, and the core material is phase-change material; the size of the phase-change nanocapsules is 20 ~80nm;

[0034] Step 2, dissolve the nano-phase-change capsules in water, then add a certain amount of porous graphene, and disperse by ultrasonic for 5-10 hours, so that the nano-phase-chan...

Embodiment 1

[0038] Add 300g of paraffin to 1L of 0.5g / l graphene oxide solution, heat at 90°C, after the paraffin melts, ultrasonicate for 2 hours, then add sulfuric acid dropwise to it, adjust the pH of the system to 2~3, and form 30 after cooling. ~50nm graphene oxide-wrapped nanocapsules of phase change materials (referred to as phase change capsules).

[0039]Add porous graphene to the aqueous solution of nano phase change capsules according to the weight ratio of phase change capsules / porous graphene of 800 / 1, ultrasonicate for 6 hours, centrifuge the above solution, and take the precipitate and place it in a low temperature box at -20°C Freeze-drying to obtain a fluffy phase-change composite material with high specific surface area, high electrical conductivity and high thermal conductivity, and then the porous graphene-based phase-change composite material: positive / negative active material: binder weight ratio is 6:92:2 to prepare a solid content 60% positive / negative electrode sl...

Embodiment 2

[0044] Add 300g of stearic acid into 1L of 0.5g / l graphene oxide solution, heat at 75°C, after the stearic acid melts, ultrasonicate for 1h, then add sulfuric acid dropwise to adjust the pH of the system to 2~3, After cooling, a 30-70nm graphene oxide-wrapped nanocapsule of phase-change material (referred to as phase-change capsule) is formed.

[0045] Add porous graphene to the aqueous solution of nano phase change capsules according to the weight ratio of phase change capsules / porous graphene of 800 / 1, ultrasonicate for 6 hours, centrifuge the above solution, and take the precipitate and place it in a low temperature box at -20°C Freeze-dry to obtain a fluffy high specific surface, high electrical conductivity and high thermal conductivity phase change composite material, and then prepare a solid content according to the porous graphene-based phase change composite material: positive / negative active material: binder weight ratio of 5:92:3 60% positive / negative electrode slur...

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 lithium ion battery containing a high-thermal-conductivity and high-conductivity phase change composite material and a conductive agent. The high-thermal-conductivity and high-conductivity phase change composite material comprises a porous graphene substrate and an oxidized graphene phase change nanocapsule adsorbed in the substrate. The high-thermal-conductivity and high-conductivity phase change composite material provided by the invention has the characteristics of high thermal conductivity and high conductivity of graphene and the characteristic of high thermal conductivity of oxidized graphene, has the advantages of high heat conduction efficiency, high conductive performance and large energy storage capacity, is used in a high-specific-energy lithium ion battery, and can quickly absorb large amounts of heat generated in an abuse test; meanwhile, the oxidized graphene has a flame-retardant effect, so that the safety of the lithium ion battery in the abuse test is greatly enhanced; and moreover, due to the characteristic of high thermal conductivity of the graphene substrate and an oxidized graphene wall material, the heat generated by the high-specific-energy lithium ion battery during use can be effectively diffused, so that the temperature rise of the battery during use is effectively reduced and the service life of the battery is prolonged.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and relates to a lithium-ion battery, in particular, to a lithium-ion battery containing a phase-change composite material with high thermal and electrical conductivity, which is a safe lithium-ion battery that can dissipate heat quickly, and because The temperature rise during the use of the battery is effectively controlled, and the service life of the battery is improved. Background technique [0002] With the continuous development of new energy vehicles, lithium-ion batteries continue to be sought after. At the same time, new energy vehicles also put forward more and more stringent requirements for the battery life, service life and safety performance of lithium-ion batteries. At present, in order to meet the requirements of electric vehicles for cruising range, various lithium-ion battery production units have launched battery technology research on replacing lithium iron phos...

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
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/62H01M4/624H01M4/625H01M10/0525Y02E60/10
Inventor 郭志红刘婵侯敏曹辉王东
Owner SHANGHAI AEROSPACE POWER TECH
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