Electrolyte liquid with fast charging and ultralow-temperature discharging performances and lithium ion battery

A lithium-ion battery and discharge performance technology, applied in secondary batteries, battery electrodes, organic electrolytes, etc., can solve the problems of limiting the application range of lithium-ion batteries, low discharge efficiency, etc. The effect of electrical and thermal conductivity

Pending Publication Date: 2022-02-01
林丰川 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The fastest charging speed of traditional lithium-ion batteries is about 1 hour at room temperature, while the discharge efficiency at low temperature (minus 20°C) is very low, about 50%, and low temperature (minus 40°C) basically cannot discharge normally, thus limiting the lithium-ion battery. Application Range of Ion Batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] An electrolyte solution that takes into account both fast charge and ultra-low temperature discharge performance, including solvents, electrolytes and additives.

[0041] Wherein, the solvent includes ethylene carbonate, dimethyl carbonate, ethyl methyl carbonate and propylene carbonate with a mass ratio of 1:1:1:0.5. On the basis of the original ternary solvent, propylene carbonate is added to become a quaternary solvent. Because propylene carbonate has the characteristics of low melting point and large dielectric constant, it can significantly improve the low-temperature performance of the battery.

[0042] The electrolyte includes lithium hexafluorophosphate and lithium tetrafluoroborate at a mass ratio of 1:0.5, and the molar concentration of the electrolyte is 1mol / L. The commonly used electrolyte for lithium-ion batteries is lithium hexafluorophosphate, which has stable electrochemical performance at room temperature and is easily soluble in organic solvents. How...

Embodiment 2

[0046] A lithium ion battery, comprising a positive electrode sheet, a negative electrode sheet, a separator and an electrolyte, wherein the electrolyte is as described in Example 1.

[0047] Positive sheet production:

[0048] The positive electrode slurry includes the following components in mass percentage: 92-94% main active material, 1-3% conductive carbon black, 0.5-1% graphene, 0.5-1% aluminum nitride, 2.5-4.5% polyvinylidene fluoride . The main active material is used to provide battery charge and discharge capacity; conductive carbon black is used to improve the conductivity of positive electrode materials; graphene is used to improve the superconductivity of positive electrode materials; aluminum nitride is used to improve the thermal conductivity of positive electrode materials; Ethylene is used to improve the binding properties of the positive electrode material. The main active material is preferably lithium iron phosphate.

[0049] The positive electrode slurr...

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PUM

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Abstract

The invention belongs to the technical field of lithium ion batteries, and discloses electrolyte liquid with fast charging and ultralow temperature charging performance and a lithium ion battery. The electrolyte liquid comprises a solvent, an electrolyte and an additive; the solvent comprises ethylene carbonate, dimethyl carbonate, methyl ethyl carbonate and propylene carbonate in a mass ratio of 1: 1: 1: 0.5; the electrolyte comprises lithium hexafluorophosphate and lithium tetrafluoroborate in a mass ratio of 1: 0.5, and the molar concentration of the electrolyte is 1mol / L; and the additive is silicon nitride, and the mass concentration of the silicon nitride is 0.1%. The additive silicon nitride is added into the electrolyte liquid disclosed by the invention, so that the thermal shock resistance of the battery can be improved, and the performance of the battery can be kept stable at high and low temperatures, so that the fast charging and ultralow-temperature discharging performances are both considered. The battery provided by the invention can be fully charged within 15 minutes, the discharging efficiency at -20 DEG C is greater than 80%, the discharging efficiency at -50 DEG C is greater than 60%, and the use requirements in frigid regions are met.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to an electrolyte solution and a lithium-ion battery that take into account fast charging and ultra-low temperature discharge performance. Background technique [0002] Lithium-ion batteries, with their high energy, high battery voltage, wide operating temperature range, long storage life, no memory effect, small self-discharge rate, fast charge and discharge, etc., are widely used in mobile phones, notebook computers, digital cameras and other electronic devices. Among the products, it is also widely used as a power battery in electric bicycles, model airplanes, and electric vehicles. [0003] The fastest charging speed of traditional lithium-ion batteries is about 1 hour at room temperature, while the discharge efficiency at low temperature (minus 20°C) is very low, about 50%, and low temperature (minus 40°C) basically cannot discharge normally, thus limiting the lit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0568H01M10/0569H01M4/136H01M4/1397H01M4/62H01M10/0525H01M10/42H01M10/613H01M10/653H01M10/654
CPCH01M10/0567H01M10/0569H01M10/0568H01M10/0525H01M10/4235H01M4/1397H01M4/136H01M4/625H01M4/624H01M10/613H01M10/654H01M10/653H01M2004/028H01M2300/0042Y02E60/10
Inventor 林丰川高国鹏
Owner 林丰川
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