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Lithium ion battery non-aqueous electrolyte and lithium ion battery using same

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion battery non-aqueous electrolyte, can solve the problems of battery production cost and use cost increase

Pending Publication Date: 2022-06-07
SINOCHEM INT CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods can indeed improve the low-temperature performance and rate performance of lithium-ion batteries to a certain extent, but they do not take the inherent dominant factors that limit the rate and low-temperature performance of lithium-ion batteries as the starting point, so they often exchange for battery production costs and use costs.

Method used

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  • Lithium ion battery non-aqueous electrolyte and lithium ion battery using same
  • Lithium ion battery non-aqueous electrolyte and lithium ion battery using same
  • Lithium ion battery non-aqueous electrolyte and lithium ion battery using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Example 1 Electrolyte was prepared by the following method: Ethylene carbonate (EC), propylene carbonate (PC), diethyl carbonate (DEC) and ethyl methyl carbonate were mixed in a glove box with water content 6 Dissolve to prepare an electrolyte with a lithium salt concentration of 1 mol / L; then, add an additive vinylene carbonate (VC) that accounts for 1% of the total electrolyte mass, and an additive 1 that accounts for 1% of the total electrolyte mass to the electrolyte, 3 propane sultone (PS) and additive fluorinated ethylene carbonate (FEC) accounting for 1% of the total mass of the electrolyte; after that, add 0.2% of the total electrolyte mass of the cosolvent SnF to the electrolyte 2 ; Finally, add the desolvation agent LiNO, which accounts for 1% of the total mass of the electrolyte. 3 , and fully stirred to obtain a non-aqueous electrolyte for lithium ion batteries.

[0056] The configured lithium-ion battery non-aqueous electrolyte is injected into the lithium ...

Embodiment 2

[0058] The composition of organic solvent, lithium salt and additive in the non-aqueous electrolyte of embodiment 2 is with embodiment 1; Difference is, in embodiment 2, in electrolyte, add the cosolvent two ( Trifluoromethylsulfonyl)imide magnesium; finally, add the desolvation agent LiNO accounting for 2% of the total mass of the electrolyte 3 and the desolvation agent NaNO, accounting for 1% of the total electrolyte mass 3 , and fully stirred to obtain a non-aqueous electrolyte for lithium ion batteries.

[0059] The configured lithium-ion battery non-aqueous electrolyte is injected into the lithium cobalt oxide / graphite soft pack battery, and the battery performance test is carried out through the processes of infiltration, formation, degassing, aging and capacity separation.

Embodiment 3

[0061] The composition of organic solvent, lithium salt and additive in the non-aqueous electrolyte of Example 3 is the same as that of Example 1; the difference is that in Example 3, the cosolvent trifluorocarbon that accounts for 0.3% of the total mass of the electrolyte is added in the electrolyte Copper methane sulfonate; finally, adding 1% of the total electrolyte mass, the desolvating agent LiNO 3 and the desolvation agent NaNO, accounting for 1% of the total electrolyte mass 3 , and fully stirred to obtain a non-aqueous electrolyte for lithium ion batteries.

[0062] The configured lithium-ion battery non-aqueous electrolyte is injected into the lithium cobalt oxide / graphite soft pack battery, and the battery performance test is carried out through the processes of infiltration, formation, degassing, aging and capacity separation.

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Abstract

The invention provides a lithium ion battery electrolyte, which is characterized in that the lithium ion battery electrolyte comprises a desolvation agent and a cosolvent, the desolvation agent is alkali metal nitrate, and the cosolvent is an organic solvent. The cosolvent is selected from one or more of tin salt, magnesium salt, zinc salt, calcium salt, antimony salt and copper salt of hydrofluoric acid, bis (trifluoromethylsulfonyl) imide and trifluoromethanesulfonic acid. The desolvation agent is added into the electrolyte without changing other elements of the lithium ion battery, so that the energy potential barrier of the desolvation step in the charge-discharge process of the lithium ion battery is reduced, the speed of removing the solvation sheath from the solvation Li < + > is increased, and the charge transfer impedance is reduced, thereby reducing the electrochemical polarization; and the rate capability and the low-temperature performance of the lithium ion battery are improved.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and particularly relates to a non-aqueous electrolyte for lithium ion batteries and a lithium ion battery using the electrolyte. Background technique [0002] Lithium-ion batteries have been widely used in electric vehicles, energy storage, digital electronic products, etc. due to their high specific capacity, small self-discharge, wide operating temperature range, high voltage platform, long cycle life, no memory effect, and environmental friendliness. field. At present, the commonly used positive electrode materials in commercial lithium-ion batteries include lithium iron phosphate, lithium cobalt oxide, ternary nickel cobalt lithium manganate, etc., and the negative electrodes are mostly graphite, lithium titanate (Li 4 Ti 5 O 12 ) and other intercalated materials. In recent years, with the continuous development of battery technology and the continuous popularization of lithium-ion ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0567H01M10/0525H01M2300/0025Y02E60/10
Inventor 陈周昊李明
Owner SINOCHEM INT CORP
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