Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for improving energy density of lithium-ion power battery and lithium-ion power battery

A power battery and energy density technology, applied in the field of electrochemistry, can solve the problems of low energy density and achieve the effect of increasing energy density and driving distance

Active Publication Date: 2015-04-29
苏州悦钠新能源科技有限公司
View PDF7 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Lithium-ion batteries have broad application prospects in the field of new energy, such as in the field of electric vehicles, and energy storage fields such as solar or wind energy or pumped energy storage power stations, especially in the field of electric vehicles, which require high energy density to achieve long cruising range. A long service life is required to have economic use value. The energy density of existing commercial lithium-ion power batteries is still low, and the cruising range is still short compared with gasoline engines. Further improving the energy density of lithium-ion batteries is of great academic importance. and economic value

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
  • Method for improving energy density of lithium-ion power battery and lithium-ion power battery
  • Method for improving energy density of lithium-ion power battery and lithium-ion power battery

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] (2) The negative electrode sheet is made of a negative electrode material with a high liquid absorption rate and a high liquid retention rate for the electrolyte, and the negative electrode material is prepared by the following method: calcining the oil-based needle coke raw material at 1300-1800 °C to a pore size 10-15%; the calcined needle coke is mixed with liquid pitch at 100-300°C and 2-10 atmospheres for high-pressure impregnation until the pore size is 3-10%; the impregnated needle coke Coke is graphitized at 3000-3800°C to obtain graphite with a pore size of 0.01-100 μm and a pore size of 50-70%; the above-mentioned graphite is made into graphite particles with D10≥3 μm, D50 of 3-15 μm, and D90≤20 μm ; The above-mentioned graphite particles are coated with furan resin, bakelite resin or hard carbon; the coated graphite particles are subjected to halogenation purification to obtain negative electrode materials;

[0027] (3) adopt the copolymer binding agent with ...

Embodiment 1

[0067] To make a polymer lithium-ion battery with a model number of 0495150 and a capacity of 10.48 ampere hours (Ah), the specific steps are as follows:

[0068] The oil-based needle coke raw material is calcined at 1300 °C, and the temperature of the raw material is about 300 °C, and the gap left after the volatile matter of the raw material is removed after calcination, such high-temperature needle coke is directly put into the vacuum autoclave for high-pressure Dipping, there is asphalt in the autoclave, after feeding such high-temperature needle coke, vacuumize, at a temperature of 100 to 300 degrees and a pressure of 2 to 10 atmospheres, the liquid asphalt penetrates into the pores of the needle coke, thereby To improve the tap density of the product. The porosity dropped from the original 10%-15% to about 3%. The resulting semi-finished product is packaged in a graphite clamp pot and subjected to graphitization treatment at 3000°C. Since the needle coke has been turne...

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

PropertyMeasurementUnit
Areal densityaaaaaaaaaa
Areal densityaaaaaaaaaa
Apertureaaaaaaaaaa
Login to View More

Abstract

The invention relates to a method for improving energy density of a lithium-ion power battery and the lithium-ion power battery. The surface density or thickness of a positive plate and a negative plate is increased, so that the weight ratio of the amount of a current collector and a diaphragm in the whole battery is correspondingly reduced, the weight ratio of active materials in the whole battery is improved; and therefore, the aim of improving the weight ratio and energy density of the battery is achieved. In addition, by adopting a negative active material with high liquid absorption rate and high liquid retention rate, a copolymer adhesive with a polar group, a carbon-nano-tube conductive agent, electrolyte consisting of a lithium imide salt and a nitrile solvent with 1 or 2 nitrile groups in the molecular structure, and a polyethylene porous membrane coated with alumina ceramics on a single side, the lithium-ion power battery is subjected to high-frequency oscillation by utilizing an ultrasonic high-frequency oscillation technology, so that high power capacity of the battery design is exerted, and the condition that the electrical property and service effect of the battery are reduced due to increase of the surface density of the positive and negative plates is avoided.

Description

technical field [0001] The invention relates to the technical field of electrochemistry, in particular to a method for increasing the energy density of a lithium-ion power battery and the lithium-ion power battery. Background technique [0002] A chemical battery is a device that converts chemical energy directly into electrical energy. The chemical battery mainly includes a casing as a sealing material, an electrolyte solution in the casing, positive and negative electrodes immersed in the solution, and wires or metal connecting sheets for connecting the electrodes. In a rechargeable chemical battery, it further includes a circuit board for charging operation, and the above-mentioned electrolyte solution, positive and negative electrodes, etc. are collectively referred to as a battery cell. The existing lithium-ion battery is a kind of chemical battery. The lithium-ion battery uses two different lithium-intercalation compounds that can reversibly intercalate and extract li...

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): H01M10/0525H01M10/058
CPCH01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 张贵萍余克清姚培新刘非黄子欣张潘毅余潘轩李振张晓泉黄新华
Owner 苏州悦钠新能源科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com