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Electrolyte, preparation method thereof and lithium ion battery

A lithium-ion battery and electrolyte technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve the problems of electrolyte cycle performance, high temperature performance, room temperature and low temperature power performance, etc. The effect of stability, simple operation and short process

Active Publication Date: 2021-04-16
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the deficiencies in the prior art, the object of the present invention is to provide an electrolyte and a preparation method thereof and a lithium-ion battery. The electrolyte provided by the invention solves the problems of battery electrolyte cycle performance, high temperature performance, room temperature and low temperature power performance. balance problem

Method used

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  • Electrolyte, preparation method thereof and lithium ion battery
  • Electrolyte, preparation method thereof and lithium ion battery
  • Electrolyte, preparation method thereof and lithium ion battery

Examples

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Embodiment 1

[0062] This embodiment provides an electrolyte, which is composed of an organic solvent, electrolyte salt and additives. The additives are unsaturated carbonate additives, lithium salt additives, additive A and additive B.

[0063] The unsaturated carbonate additive is vinylene carbonate, with a mass fraction of 0.8% in the electrolyte;

[0064] The lithium salt additive is lithium bisfluorosulfonimide, with a mass fraction of 2% in the electrolyte;

[0065] Additive A is 2-sulfobenzoic anhydride (compound 10), the mass fraction in the electrolyte is 0.6%;

[0066] Additive B is trimethyl isocyanurate (compound 1), with a mass fraction of 0.6% in the electrolyte.

[0067] The lithium salt is lithium hexafluorophosphate, and its concentration in the electrolyte is 1.0 mol / L.

[0068] Described organic solvent is made up of ethylene carbonate, dimethyl carbonate, ethyl methyl carbonate and chain carboxylate (ethyl propionate), and the total volume of organic solvent is 100%, ...

Embodiment 2

[0073] This embodiment provides an electrolyte, which is composed of an organic solvent, electrolyte salt and additives. The additives are unsaturated carbonate additives, lithium salt additives, additive A and additive B.

[0074] The unsaturated carbonate additive is fluoroethylene carbonate, with a mass fraction of 0.6% in the electrolyte;

[0075] The lithium salt additive is lithium difluorophosphate, with a mass fraction of 1.0% in the electrolyte;

[0076] Additive A is 2-sulfopropionic anhydride (compound 7), with a mass fraction of 0.8% in the electrolyte;

[0077] Additive B is triethyl isocyanurate (compound 2), with a mass fraction of 0.4% in the electrolyte.

[0078] The lithium salt is lithium hexafluorophosphate, and its concentration in the electrolyte is 1.2 mol / L.

[0079] Described organic solvent is made up of ethylene carbonate, dimethyl carbonate, ethyl methyl carbonate and chain carboxylate (methyl propionate), and the total volume of organic solvent ...

Embodiment 3

[0084] This embodiment provides an electrolyte, which is composed of an organic solvent, electrolyte salt and additives. The additives are unsaturated carbonate additives, lithium salt additives, additive A and additive B.

[0085] The unsaturated carbonate additive is a mixture of vinylene carbonate and fluoroethylene carbonate (the mass ratio of vinylene carbonate and fluoroethylene carbonate is 1:1), and the mass fraction in the electrolyte is 1.0%;

[0086] The lithium salt additive is lithium bisoxalate borate, with a mass fraction of 0.5% in the electrolyte;

[0087] Additive A is 4,4-dimethyl-2-sulfopropionic anhydride (compound 8), the mass fraction in the electrolyte is 1.0%;

[0088] Additive B is trichloroisocyanuric acid (compound 5), with a mass fraction of 1.0% in the electrolyte.

[0089] The lithium salt is lithium hexafluorophosphate, and its concentration in the electrolyte is 1.2 mol / L.

[0090] Described organic solvent is made up of ethylene carbonate, ...

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Abstract

The invention provides an electrolyte, a preparation method thereof and a lithium ion battery. The electrolyte comprises an additive, and the additive comprises an unsaturated carbonate additive, a lithium salt additive, an additive A and an additive B; and the additive B comprises an isocyanuric acid derivative. The preparation method comprises the following steps: in a protective atmosphere, mixing a formula amount of additives with other raw materials to obtain the electrolyte, wherein the additives comprise an unsaturated carbonate additive, a lithium salt additive, an additive A and an additive B. The electrolyte provided by the invention solves the problem that the cycle performance, the high-temperature performance, the normal-temperature power performance and the low-temperature power performance of the battery electrolyte are difficult to consider at the same time.

Description

technical field [0001] The invention belongs to the technical field of batteries, and relates to an electrolytic solution, a preparation method thereof and a lithium ion battery. Background technique [0002] In recent years, high-nickel materials have been applied to electric vehicle batteries, but the increase in Ni content has made the thermal stability of the already unsafe ternary materials more uncontrollable. Combining NCM and LMFP can effectively improve the safety of batteries, but LMFP itself has the problems of electronic conductivity, low ion diffusion and the influence of Jahn-Taller, and the cycle performance of the material itself is poor, especially at high temperatures. attenuation. The high-nickel ternary itself is also prone to cation mixing due to the increase of Ni element content. At the same time, the high-nickel ternary is more likely to mix with water and CO at high temperature. 2 The reaction will cause the battery to produce gas and affect the cy...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0567H01M10/0525H01M10/42
Inventor 邹志群曾汉民何巍袁中直刘建华刘金成
Owner EVE ENERGY CO LTD
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