Unlock instant, AI-driven research and patent intelligence for your innovation.

Lithium ion battery electrolyte

A lithium-ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of battery swelling, reduce the solubility of electrolyte salt, and reduce battery performance, so as to achieve stable operation, widen the working temperature range, The effect of improving the melting point

Inactive Publication Date: 2015-11-25
HUNAN CMAX NEW ENERGY TECH
View PDF8 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, linear carboxylic acid esters generally have a low boiling point (<100°C), which leads to poor high-temperature performance of the battery. Working in an environment higher than 50°C will cause the battery to swell due to solvent volatilization
In addition, the dielectric constant of linear carboxylate is very small (<7), adding a large amount will reduce the solubility of electrolyte salt, thereby reducing battery performance

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 electrolyte
  • Lithium ion battery electrolyte
  • Lithium ion battery electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add a wide temperature range co-solvent (butyl ether (BE):2-nitropropane (2-NP)=1:1; account for 10% of the total mass of the solvent) to make a mixed solvent, then add 2% propenyl-1,3-propane sultone (PES) to the mixed solvent, and dissolve in 1.0M lithium hexafluorophosphate (LiPF 6 ), to obtain 1.0MLiPF 6 / (EC+EMC+BE+2-NP+PES) electrolyte for lithium-ion batteries, test its conductivity with a conductivity meter, and compare with 1.0MLiPF 6 / (EC+EMC) electrolyte conductivity for comparison, the results are shown in Table 1:

[0019] Table 1 Conductivity of lithium-ion batteries at different temperatures

[0020]

[0021] LiCoO made with this electrolyte 2 The discharge capacity of the / AG battery at -50°C and -40°C is 68% and 87% of the normal temperature discharge capacity respectively, and the discharge capacity retention rate after storage at 70°C for 72 hours is about 87%. Has good high and low temperature performance.

Embodiment 2

[0023] In the solvent of ethylene carbonate (PC) + ethyl methyl carbonate (EMC) = 1:1, add a wide temperature range co-solvent (dipropyl ether (PE): 2-nitropropane (2-NP) = 1:1 ; account for 0.1% of the total mass of the solvent) to make a mixed solvent, then add 0.1% of 1,3-propane sultone (PS) and 1% of 3-fluoropropane sultone (FPS) to the mixed solvent ), and dissolved in 1.0M lithium hexafluorophosphate (LiPF 6 ), to obtain 1.0MLiPF 6 / (PC+EMC+BE+2-NP+PES) electrolyte for lithium-ion batteries, test its conductivity with a conductivity meter, and compare with 1.0MLiPF 6 / (EC+EMC) electrolyte conductivity for comparison, the results are shown in Table 2:

[0024] Table 2 Conductivity of lithium-ion batteries at different temperatures

[0025]

[0026] LiCoO made with this electrolyte 2 The discharge capacity of / AG battery at -50°C and -40°C is 72% and 85% of the normal temperature discharge capacity respectively, and the discharge capacity retention rate after stora...

Embodiment 3

[0028] In the solvent of ethylene carbonate (EC) + acetonitrile (AN) = 1:1, add a wide temperature range co-solvent (diethyl ether (DEE): butyl ether (BE): nitrobutane (NB): = 1:1: 3; accounting for 50% of the total mass of the solvent) to make a mixed solvent, then add 5% propenyl-1,3-propane sultone (PES) to the mixed solvent, and dissolve it into 1.0M lithium hexafluorophosphate (LiPF 6 ), to obtain 1.0MLiPF 6 / (EC+AN+DEE+BE+NB+PES) Electrolyte for lithium-ion batteries, test its conductivity with a conductivity meter, and compare with 1.0MLiPF 6 / (EC+EMC) electrolyte conductivity for comparison, the results are shown in Table 3:

[0029] Table 3 Conductivity of lithium-ion batteries at different temperatures

[0030]

[0031] LiCoO made with this electrolyte 2 The discharge capacity of / AG battery at -50°C and -40°C is 78% and 88% of the normal temperature discharge capacity respectively, and the discharge capacity retention rate after storage at 70°C for 72 hours is...

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 electrolyte. The lithium ion battery electrolyte consists of an electrolyte lithium salt, a solvent and a high-temperature film-forming additive; the solvent consists of a nitriles solvent and / or an esters solvent and a wide-temperature range cosolvent; the wide-temperature range cosolvent is an ethers compound and / or an alkane compound containing nitro. The lithium ion battery electrolyte is added with ethers and / or the alkane compound containing nitro, so that the performances, such as melting point, boiling point and dielectric constant, of the electrolyte can be improved, and the high-temperature and low-temperature performances of the electrolyte are improved; and moreover, the high-temperature film-forming additive is added into the electrolyte, an SEI film relatively stable under high temperature is formed at the anode of a lithium battery, and the solvent can be prevented from being reduced at the graphite anode, so that the lithium ion battery can stably work at the temperature of -60 to 70 DEG C.

Description

technical field [0001] The invention relates to a lithium-ion battery electrolyte, belonging to the technical field of lithium-ion battery electrolytes. Background technique [0002] Lithium-ion batteries are a new generation of green and environmentally friendly batteries developed in the 1990s. They have the characteristics of high voltage, high specific energy, long charge and discharge life, safety and environmental protection, and become the first choice for portable power sources and power batteries. In many fields, such as aerospace, military industry and polar environment, the operating temperature of electronic energy storage devices is required to be -40°C or below. Conventional low-temperature discharge of lithium-ion batteries can basically only work at -20°C, which limits the application of lithium-ion batteries in military and civilian high-end products. If only the low-temperature discharge performance is simply pursued, by adjusting the electrolyte solvent, ...

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): H01M10/0569H01M10/0525
CPCH01M10/0525H01M10/0569Y02E60/10
Inventor 关翔赖延清洪波
Owner HUNAN CMAX NEW ENERGY TECH