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Lithium-ion power battery electrolyte

A power battery and electrolyte technology, applied in the field of material chemistry and high-energy batteries, can solve the problems of poor rate performance and poor stability, and achieve the effects of low volatility, high thermal stability and high safety

Active Publication Date: 2014-07-30
ENERGY RES INST OF SHANDONG ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a lithium-ion power battery electrolyte for the defects of the current lithium-ion battery electrolyte, such as poor stability, volatility, and flammability, which lead to poor safety, cycle performance, and rate performance of the lithium-ion battery.

Method used

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Examples

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Embodiment Construction

[0017] In order to fully illustrate the characteristics of the present invention and the mode of carrying out the present invention, examples are given below.

[0018] The button batteries used for testing in Examples 1-45 all refer to batteries of the same batch and type.

[0019] Described button cell is assembled by following method:

[0020] Mix lithium iron phosphate, acetylene black and PVDF (polyvinylidene fluoride) in a mass ratio of 8:1:1, add N-methyl-2-pyrrolidone binder solution and mix to form a uniform slurry, and coat evenly On the aluminum foil substrate, moisture and solvent are removed in a drying oven, and then compacted with an oil press to obtain a film of a certain thickness. After being vacuum-dried in a vacuum drying oven, it was cut into circular pole pieces with a diameter of 8 mm and placed in a glove box filled with argon for standby. The mass of the aluminum foil was weighed before and after the film coating, and then the weight of the active mat...

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Abstract

The invention relates to a lithium-ion power battery electrolyte. The lithium-ion power battery electrolyte comprises four components, namely, quaternary ammonium chloride, a hydrogen bond donor, lithium salt electrolyte and polyethylene glycol PEG, wherein the mole ratio of the quaternary ammonium chloride and the hydrogen bond donor is (1 to1)-(1to3); the concentration of the lithium salt electrolyte in the electrolyte is 0.1-3.0mol / L, and the PEG is 0.1%-90% of total mass of the electrolyte. On one hand, an ionic liquid guarantees the high security and fire resistance of electrolysis, on the other hand, and the price of the lithium-ion power battery electrolyte is low; meanwhile, a PEG component is added in the electrolyte, the compatibility of an electrolyte and a lithium-ion battery material is improved, and the property of electrolyte is improved. The lithium-ion power battery electrolyte provided by the invention has properties of good security property, fire resistance, high temperature characteristic and withstand voltage property and the like.

Description

technical field [0001] The invention relates to an electrolyte solution for lithium-ion power batteries, belonging to the technical fields of material chemistry and high-energy batteries. Background technique [0002] Lithium-ion battery is a new type of chemical power source, which is widely used in portable electronic products such as mobile phones because of its high energy density, high working voltage, long life and no environmental pollution. The performance of lithium-ion batteries is largely determined by the positive electrode material, negative electrode material and electrolyte. From the aspect of lithium-ion battery materials, the main reasons affecting its safety performance are: the graphite as the negative electrode in the charging state has high chemical activity, and the reaction with the electrolyte will release heat; the transition metal oxide in the positive electrode in the charging state has a strong Oxidation, it will decompose and release oxygen at h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0566
CPCH01M10/0525H01M10/0566H01M10/0567H01M10/0568H01M10/0569H01M10/4235H01M2300/0025H01M2300/0045Y02E60/10
Inventor 胡素琴秦显忠蔡飞鹏马烽
Owner ENERGY RES INST OF SHANDONG ACAD OF SCI
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