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Electrolyte for lithium ion battery

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of matching electron conduction rates, large ion transfer impedance, preventing high-power lithium-ion batteries, etc., and achieves low electrode interface impedance and high ion conduction capability, the effect of high power performance

Active Publication Date: 2021-06-18
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the ability of the electrolyte to conduct lithium ions cannot match the high-rate electrochemical reaction and electron conduction rate, and the ion transfer impedance of the solid electrolyte interface film formed by the existing electrolyte and electrode materials is still very large. prevents the high power performance of lithium-ion batteries

Method used

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  • Electrolyte for lithium ion battery
  • Electrolyte for lithium ion battery
  • Electrolyte for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Electrolyte composition: solvent, electrolyte salt and additives.

[0031] Solvent: ethylene carbonate, solvent (solvent structure 1) (volume ratio 1:1).

[0032] The electrolyte salt is lithium hexafluorophosphate, the concentration is 1mol / L,

[0033] The additive is additive structure 1 with a concentration of 2%.

[0034] After mixing the above materials evenly, test the conductivity of the electrolyte. The positive electrode material used to test the performance of the electrolyte is lithium cobalt oxide, and the load is 4mg / cm 2 , the negative electrode material is graphite, and the load is 1.5mg / cm2. The separator is a polypropylene separator that composes a 2016 button cell. The charge and discharge currents are 10A, respectively, and the cut-off voltage is 3.0V-4.2V. The energy densities of the cells based on the active materials are reported in Table 2. And test the AC impedance of the battery, record in figure 1

Embodiment 2

[0038] Electrolyte composition. Solvent: ethylene carbonate, solvent (structure 2) (volume ratio 1:1.5). The electrolyte salt is lithium hexafluorophosphate with a concentration of 1.2 mol / L, and the additive is additive structure 2 with a concentration of 2%. After mixing the above materials evenly, test the conductivity of the electrolyte. The positive electrode material used to test the performance of the electrolyte is lithium cobalt oxide, and the load is 4mg / cm 2 , the negative electrode material is graphite, and the load is 1.5mg / cm2. The separator is a polypropylene separator that composes a 2016 button cell. The charge and discharge currents are 10A, respectively, and the cut-off voltage is 3.0V-4.2V. The energy densities of the cells based on the active materials are reported in Table 2.

Embodiment 3

[0040] Electrolyte composition. Solvent: ethylene carbonate, solvent (structure 3) (volume ratio 1:1). The electrolyte salt is lithium hexafluorophosphate with a concentration of 1.1 mol / L, and the additive is additive structure 3 with a concentration of 2%. After mixing the above materials evenly, test the conductivity of the electrolyte. The positive electrode material used to test the performance of the electrolyte is lithium cobalt oxide, and the load is 4mg / cm 2 , the negative electrode material is graphite, and the load is 1.5mg / cm2. The separator is a polypropylene separator that composes a 2016 button cell. The charge and discharge currents are 10A, respectively, and the cut-off voltage is 3.0V-4.2V. The energy densities of the cells based on the active materials are reported in Table 2.

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Abstract

The invention provides an electrolyte for a lithium ion battery. The electrolyte comprises a solvent, an electrolyte salt and an additive, wherein the solvent contains ethylene carbonate. The used solvent is more beneficial to lithium salt dissociation and has higher lithium ion conductivity, and the adopted additive forms a solid electrolyte membrane which has lower electrode interface impedance, so that higher ion conduction capability can be realized, the shortages of the electrochemical reaction process during high-power discharge are overcome, and the battery using the electrolyte provided by the invention has higher power performance.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to an electrolyte solution for lithium ion batteries. Background technique [0002] As the current mainstream secondary battery technology, lithium-ion batteries have been widely used in industries such as consumer electronics, electric vehicles, and large-scale energy storage, and have greatly improved human life. As the application environment changes, lithium-ion batteries are increasingly required to operate at higher specific power conditions, that is, to have fast charge and discharge capabilities. Such as start-stop batteries for automobiles, high-speed rail, and subways, UAV model batteries, etc. [0003] One of the keys to improving the high power of lithium-ion batteries is to accelerate the transmission rate of lithium ions during the charging and discharging process of the battery, including increasing the transmission rate of lithium ions in the electrolyte, lithiu...

Claims

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Application Information

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IPC IPC(8): H01M10/0569H01M10/0567H01M10/0525
CPCH01M10/0569H01M10/0567H01M10/0525H01M2300/0028Y02E60/10
Inventor 曲超张洪章李先锋马荻张华民
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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