Low-temperature electrolyte for lithium-ion battery and application thereof

A lithium-ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc.

Inactive Publication Date: 2019-06-07
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are few studies on low-temperature electrolyt

Method used

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  • Low-temperature electrolyte for lithium-ion battery and application thereof
  • Low-temperature electrolyte for lithium-ion battery and application thereof
  • Low-temperature electrolyte for lithium-ion battery and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The electrolyte lithium salt is LiPF6 and LiBF4, the molar ratio of the two is 1:3, the concentration of the lithium salt in the electrolyte is 1.2mol / L; the solvent is a mixture of ethylene carbonate and methyl acetate solvent, the volume ratio of the two is 1 : 2; The additive is VC, and the mass fraction is 1%. ;

[0021] The positive electrode of the lithium-ion battery is prepared as follows: Li 3 V 2 (PO 4 ) 3 The mass ratio of conductive carbon black and binder is 8:1:1, dissolved in an appropriate amount of N-methylpyrrolidone and mixed evenly, coated with a wet film preparer to form an electrode film with a thickness of 0.15mm, and dried in vacuum Finally, slice the electrode sheets with a diameter of 12mm with a microtome, weigh and calculate the mass of the active material. At the same time, a lithium sheet was used as the negative electrode, Celgard 2500 was used as the diaphragm, 50 microliters of electrolyte was added, and a button battery was assembl...

Embodiment 2

[0024] The electrolyte lithium salt is LiPF6 and LiBF4, the molar ratio of the two is 1:3, the concentration of the lithium salt in the electrolyte is 1.2mol / L; the solvent is a mixture of ethylene carbonate and propyl acetate solvent, and the volume ratio of the two is 1 : 2; the additive is VC, and the mass fraction is 1%;

[0025] The test results are shown in Table 2.

Embodiment 3

[0027] The electrolyte lithium salt is LiPF6 and LiODFB, the molar ratio of the two is 1:3, the concentration of lithium salt in the electrolyte is 1.2mol / L; the solvent is a mixture of ethylene carbonate and methyl acetate solvent, the volume ratio of the two is 1 : 2; the additive is VC, and the mass fraction is 1%;

[0028] The test results are shown in Table 1.

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Abstract

The invention discloses an electrolyte for a lithium-ion battery and an application thereof. The solute of the electrolyte is one or more than two lithium salts containing boron, the solvent is one ormore than two acetate compounds, and the electrolyte contains one or more than two film formation additives. The low-temperature electrolyte has high conductivity, low charge transfer impedance and SEI film impedance at a temperature of -40 DEG C, can reduce the polarization of the lithium-ion battery and improve the capacity performance and rate performance of the lithium-ion battery at the lowtemperature.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to low-temperature electrolytes for lithium-ion batteries. Background technique [0002] Lithium-ion batteries have been widely used in many fields due to their high energy density, power density, long cycle life, flexibility and lightness, such as electronic equipment and hybrid electric vehicles, and have become the most promising energy storage in the field of new energy. technology. With the increasing application range of lithium-ion batteries, especially in the fields of electric vehicles, aerospace and military industry, there are higher requirements for the low-temperature charge and discharge performance of batteries, but the charge-discharge performance of lithium-ion batteries in low-temperature environments Poor, especially below minus 30 degrees, ordinary lithium-ion batteries are basically unusable. If the low-temperature performance of lithium-ion batte...

Claims

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Application Information

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IPC IPC(8): H01M10/0568H01M10/0569H01M10/0525
CPCY02E60/10
Inventor 马荻张华民冯凯李先锋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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