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Lithium ion battery electrolyte, preparation method thereof and lithium ion battery

A lithium-ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problem of large lithium resource usage and achieve the effect of maintaining ion transmission

Pending Publication Date: 2022-07-08
DONGGUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of this, the present invention proposes a lithium-ion battery electrolyte and a preparation method thereof and a lithium-ion battery to solve the technical problem of excessive use of lithium resources in the prior art

Method used

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  • Lithium ion battery electrolyte, preparation method thereof and lithium ion battery
  • Lithium ion battery electrolyte, preparation method thereof and lithium ion battery
  • Lithium ion battery electrolyte, preparation method thereof and lithium ion battery

Examples

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Embodiment 1

[0053] An embodiment of the present application provides an electrolyte for a lithium ion battery, including a solvent and a mixed salt, wherein the solvent is a mixture of propylene carbonate and ethyl methyl carbonate, and the mixed salt is LiPF 6 and NaPF 6 The mixture of which the mixed salt is dissolved in the solvent, the concentration of the mixed salt is 1mol / L, LiPF 6 and NaPF 6 The molar ratio of propylene carbonate and ethyl methyl carbonate is 2:8, and the mass ratio of propylene carbonate and ethyl methyl carbonate is 3:7.

[0054] The above-mentioned lithium ion battery electrolyte and electrode material are assembled into a lithium ion full battery, the positive electrode is selected from lithium cobalt oxide, the negative electrode is selected from lithium titanate, and the diaphragm is selected from polyethylene (PE).

Embodiment 2

[0056] An embodiment of the present application provides an electrolyte for a lithium ion battery, including a solvent and a mixed salt, wherein the solvent is a mixture of propylene carbonate and ethyl methyl carbonate, and the mixed salt is LiPF 6 and NaPF 6 The mixture of which the mixed salt is dissolved in the solvent, the concentration of the mixed salt is 1mol / L, LiPF 6 and NaPF 6 The molar ratio of propylene carbonate and ethyl methyl carbonate is 4:6, and the mass ratio of propylene carbonate and ethyl methyl carbonate is 3:7.

[0057] The above-mentioned lithium ion battery electrolyte and electrode material are assembled into a lithium ion full battery, the positive electrode is selected from lithium cobalt oxide, the negative electrode is selected from lithium titanate, and the diaphragm is selected from polyethylene (PE).

Embodiment 3

[0059] An embodiment of the present application provides an electrolyte for a lithium ion battery, including a solvent and a mixed salt, wherein the solvent is a mixture of propylene carbonate and ethyl methyl carbonate, and the mixed salt is LiPF 6 and NaPF 6 The mixture of which the mixed salt is dissolved in the solvent, the concentration of the mixed salt is 1mol / L, LiPF 6 and NaPF 6 The molar ratio of propylene carbonate and ethyl methyl carbonate is 6:4, and the mass ratio of propylene carbonate and ethyl methyl carbonate is 3:7.

[0060] The above-mentioned lithium ion battery electrolyte and electrode material are assembled into a lithium ion full battery, the positive electrode is selected from lithium cobalt oxide, the negative electrode is selected from lithium titanate, and the diaphragm is selected from polyethylene (PE).

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Abstract

The invention provides a lithium ion battery electrolyte, a preparation method thereof and a lithium ion battery, the electrolyte comprises a solvent and a mixed salt, the mixed salt comprises a lithium salt and an alkali metal salt, the mole fraction of the lithium salt in the mixed salt is 5-80%, and the mole fraction of the alkali metal salt in the mixed salt is 20-95%. According to the lithium ion battery electrolyte, the alkali metal salt with a high proportion is added to replace or partially replace the lithium salt, so that the consumption of the lithium salt is reduced, the cost is reduced, in the charging and discharging process, the lithium salt is embedded into and separated from two electrodes, electric energy is stored and released by means of insertion and separation of lithium ions, the alkali metal salt is conducted between the two electrodes, and the electric energy is stored and released. And the alkali metal salt has a large ion radius and does not participate in intercalation and deintercalation in the positive electrode material and the negative electrode material, so that the performance of the lithium ion battery is not influenced.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery electrolyte and a preparation method thereof, and a lithium ion battery. Background technique [0002] At present, with the large-scale application of lithium-ion batteries, the demand for lithium resources is gradually increasing, the continuous depletion of lithium salt reserves and the rising price of lithium salts also seriously restrict the future development of lithium-ion batteries. [0003] In a lithium-ion battery, during the charging process, the lithium ions in the positive electrode material are extracted from the metal oxide lattice, for example, lithium iron phosphate is extracted from lithium ions and transformed into iron phosphate, and lithium cobalt oxide is extracted from lithium ions and transformed into cobalt oxide. After the lithium ions are removed and enter the electrolyte, due to the potential difference, the lithium i...

Claims

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Application Information

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IPC IPC(8): H01M10/0568H01M10/0569H01M10/0525
CPCH01M10/0568H01M10/0569H01M10/0525H01M2300/0025Y02E60/10
Inventor 李超朱伟程李志科何杨才李勤干徐勇军杨震宇孙成华
Owner DONGGUAN UNIV OF TECH
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