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Lithium ion battery electrolyte, electrolyte injection method and lithium ion battery

A lithium-ion battery and electrolyte technology, applied in secondary batteries, battery pack components, circuits, etc., can solve the problems of high and low temperature performance of batteries, poor wetting performance, etc., to improve wetting performance, reduce viscosity, Improve the effect of protection

Active Publication Date: 2022-06-03
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defects in the prior art, such as poor wetting performance and inability to balance the high and low temperature performance of the battery cell, thereby providing a lithium-ion battery electrolyte, a liquid injection method and a lithium-ion battery.

Method used

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  • Lithium ion battery electrolyte, electrolyte injection method and lithium ion battery
  • Lithium ion battery electrolyte, electrolyte injection method and lithium ion battery

Examples

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Embodiment 1

[0049] This embodiment provides an electrolyte for a lithium ion battery, including a primary electrolyte and a secondary electrolyte, wherein the primary electrolyte is composed of an organic solvent A, an electrolyte lithium salt, and an additive A;

[0050] The organic solvent A is composed of ethylene carbonate, ethyl methyl carbonate and diethyl carbonate, and the mass ratio of ethylene carbonate, ethyl methyl carbonate and diethyl carbonate is 3:5:2;

[0051] The electrolyte lithium salt is lithium hexafluorophosphate, accounting for 16% of the total mass of the primary electrolyte;

[0052] The additive A is composed of the following components by weight: 1 part of vinylene carbonate, 1 part of vinyl sulfate, and 1 part of lithium difluorophosphate; the proportion is 3% based on the total mass of the primary electrolyte;

[0053] The secondary electrolyte is composed of organic solvent B and additive B, and the mass ratio of the two is 95:5;

[0054] Wherein, organic s...

Embodiment 2

[0062] This embodiment provides an electrolyte for a lithium ion battery, including a primary electrolyte and a secondary electrolyte, wherein the primary electrolyte is composed of an organic solvent A, an electrolyte lithium salt, and an additive A;

[0063] The organic solvent A is composed of ethylene carbonate, ethyl methyl carbonate and diethyl carbonate, and the mass ratio of ethylene carbonate, ethyl methyl carbonate and diethyl carbonate is 3:5:2;

[0064] The electrolyte lithium salt is lithium hexafluorophosphate, accounting for 16% of the total mass of the primary electrolyte;

[0065] The additive A is composed of the following components by weight: 1 part of vinylene carbonate, 1 part of vinyl sulfate, and 1 part of lithium difluorophosphate; the proportion is 8% based on the total mass of the primary electrolyte;

[0066] The secondary electrolyte is composed of organic solvent B and additive B, and the mass ratio of the two is 90:10;

[0067] Wherein, organic ...

Embodiment 3

[0071] This embodiment provides an electrolyte for a lithium ion battery, including a primary electrolyte and a secondary electrolyte, wherein the primary electrolyte is composed of an organic solvent A, an electrolyte lithium salt, and an additive A;

[0072] The organic solvent A is composed of ethylene carbonate, ethyl methyl carbonate and diethyl carbonate, and the mass ratio of ethylene carbonate, ethyl methyl carbonate and diethyl carbonate is 3:5:2;

[0073] The electrolyte lithium salt is lithium hexafluorophosphate, accounting for 16% of the total mass of the primary electrolyte;

[0074] The additive A is composed of the following components by weight: 1 part of vinylene carbonate, 1 part of vinyl sulfate, and 1 part of lithium difluorophosphate; the proportion is 4% based on the total mass of the primary electrolyte;

[0075] The secondary electrolyte is composed of organic solvent B and additive B, and the mass ratio of the two is 97:3;

[0076] Wherein, organic s...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a lithium ion battery electrolyte, an electrolyte injection method and a lithium ion battery. The lithium ion battery electrolyte provided by the invention comprises a primary electrolyte and a secondary electrolyte, and the secondary electrolyte does not comprise an electrolyte lithium salt; and the additive B is at least one of a phosphorus-based additive and a sulfur-based additive containing unsaturated bonds. The secondary electrolyte provided by the invention does not contain electrolyte lithium salt, so that the viscosity of the electrolyte can be reduced, and the wettability can be improved; according to the invention, phosphorus-based and sulfur-based additives containing unsaturated bonds are added into the cell in the form of secondary liquid injection, so that the additives are only oxidized on the surface of the positive electrode to form a film, and the protection on the interface of the positive electrode is improved; the increase of the direct-current internal resistance of the battery cell caused by film formation on the negative electrode surface is avoided; therefore, the long cycle life of the battery cell is ensured, and the low-temperature performance, the high-temperature performance and the power performance of the battery cell are also considered.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and particularly relates to a lithium ion battery electrolyte, a liquid injection method and a lithium ion battery. Background technique [0002] As a green and environmentally friendly new energy source, lithium-ion batteries have the advantages of good reliability, high safety, small size and light weight. At present, they have been widely used in digital products, electric vehicles, military products and other fields. With the vigorous support for new energy, the development of lithium-ion batteries is in full swing, but the requirements for the service life, safety and low cost of lithium-ion batteries are also getting higher and higher. Development in the direction of magnification and low cost. [0003] At present, commercial lithium-ion battery cathode materials generally use ternary materials, cobalt-free materials, lithium manganese iron phosphate materials, lithium mangan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0566H01M10/0567H01M10/0569H01M50/609H01M10/0525
CPCH01M10/0566H01M10/0569H01M10/0567H01M50/609H01M10/0525Y02P70/50Y02E60/10
Inventor 支岩辉
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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