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 impe

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

Example Embodiment

[0029] Example 1

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

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

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

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

[0034] After mixing the above materials, the electrolyte conductivity was tested. The positive electrode material used to test the performance of the electrolyte is lithium cobaltate, the burnt is 4mg / cm 2 The negative electrode material is graphite, and the burnt is 1.5 mg / cm2. The diaphragm is a polypropylene diaphragm and constitutes a 2016 buckle battery. The charge and discharge current is 10A, and the cutoff voltage is 3.0V ~ 4.2V. Recording the battery based on the energy density of the active substance at Table 2. And test battery AC impedance, recorded figure 1

Example Embodiment

[0037] Example 2

[0038] Electrolyte composition. Solvent: vinyl carbonate, solvent (structure 2) (volume ratio is 1: 1.5). The electrolyte salt is lithium hexafluorophosphate, the concentration is 1.2 mol / L, the additive is an additive structure 2, and the concentration is 2%. After mixing the above materials, the electrolyte conductivity was tested. The positive electrode material used to test the performance of the electrolyte is lithium cobaltate, the burnt is 4mg / cm 2 The negative electrode material is graphite, and the burnt is 1.5 mg / cm2. The diaphragm is a polypropylene diaphragm and constitutes a 2016 buckle battery. The charge and discharge current is 10A, and the cutoff voltage is 3.0V ~ 4.2V. Recording the battery based on the energy density of the active substance at Table 2.

Example Embodiment

[0039] Example 3

[0040] Electrolyte composition. Solvent: vinyl carbonate, solvent (structural 3) (volume ratio is 1: 1). The electrolyte salt is lithium hexafluorophosphate, the concentration is 1.1 mol / L, the additive is an additive structure 3, and the concentration is 2%. After mixing the above materials, the electrolyte conductivity was tested. The positive electrode material used to test the performance of the electrolyte is lithium cobaltate, the burnt is 4mg / cm 2 The negative electrode material is graphite, and the burnt is 1.5 mg / cm2. The diaphragm is a polypropylene diaphragm and constitutes a 2016 buckle battery. The charge and discharge current is 10A, and the cutoff voltage is 3.0V ~ 4.2V. Recording the battery based on the energy density of the active substance at 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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