A kind of electrolyte of lithium ion battery and application thereof

A lithium-ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as poor cycle performance and rapid loss of lithium-ion battery capacity, and achieve improved high temperature resistance, excellent cycle performance, and capacity The effect of high retention rate and capacity recovery rate

Active Publication Date: 2016-02-10
NINGBO VEKEN BATTERY
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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 high capacity retention rate in a high temperature environment and an electrolyte for a lithium ion battery with good cycle performance in order to solve the defects of rapid capacity loss and poor cycle performance of lithium-ion batteries in high-temperature environments

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Electrolyte preparation: Mix ethylene carbonate, propylene carbonate, ethyl methyl carbonate, and diethyl carbonate in a volume ratio of 2:1:3:5, and then add 4,5-diethylvinylene carbonate to it , 4-methyl-5-propyl vinylene carbonate, propylene sulfite and methyl tert-butyl ether, heated at 55°C to dissolve, add electrolyte lithium hexafluorophosphate to it and make a concentration of 2.5mol / L Electrolyte; the percentage by weight of the individual components of the additive in the entire electrolyte is: 5% of 4,5-diethyl vinylene carbonate, 0.5% of 4-methyl-5-propyl vinylene carbonate, propylene sulfite Esters 3%, methyl tert-butyl ether 0.01%.

[0019] Preparation of positive electrode: Dissolve 95 grams of polyvinylidene fluoride (Atofina, 761#PVDF) in 1425 grams of N-methyl-2-pyrrolidone (NMP) solvent to prepare a binder solution, and then add to the solution Add 2650 grams of lithium iron phosphate (Ningbo Intervital New Materials Co., Ltd.), mix well to prepare a...

Embodiment 2

[0023] Preparation of electrolyte solution: Mix ethylene carbonate, propylene carbonate, ethyl methyl carbonate, and diethyl carbonate in a volume ratio of 3:1:6:6, add 4,5-diethylvinylene carbonate, 4-methyl-5-propyl vinylene carbonate, propylene sulfite and methyl tert-butyl ether are heated at 50°C to dissolve them, and then the electrolyte lithium hexafluorophosphate is added to it to form a concentration of 2.7mol / L Electrolyte; the percentage by weight of the individual components of the additive in the entire electrolyte is: 5.5% of 4,5-diethylvinylene carbonate, 2% of 4-methyl-5-propyl vinylene carbonate, propylene sulfite 4% ester and 0.25% methyl tert-butyl ether.

[0024] According to the same method as in Example 1, a lithium-ion power battery with a capacity of 10Ah was prepared using the electrolyte solution prepared in this example.

Embodiment 3

[0026] Preparation of electrolyte solution: mix ethylene carbonate, propylene carbonate, ethyl methyl carbonate, and diethyl carbonate in a volume ratio of 4:1:7:10, add 4,5-diethylvinylene carbonate, 4-Methyl-5-propyl vinylene carbonate, propylene sulfite and methyl tert-butyl ether are heated at 60°C to dissolve them, and then the electrolyte lithium hexafluorophosphate is added to form an electrolytic solution with a concentration of 3mol / L. Liquid; the weight percentage of the individual components of the additive in the entire electrolyte is: 4,5-diethyl vinylene carbonate 6.5%, 4-methyl-5-propyl vinylene carbonate 3.5%, propylene sulfite 5.2% and methyl tert-butyl ether 0.45%.

[0027] According to the same method as in Example 1, a lithium-ion power battery with a capacity of 10Ah was prepared using the electrolyte solution prepared in this example.

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Abstract

The invention relates to electrolyte of a lithium ion battery and application of the electrolyte. The electrolyte consists of electrolytes, an organic solvent and additives, wherein the additives consist of the following components by taking the total weight of the electrolyte as standard: 5-6.5% of 4,5-diethyl vinylene carbonate, 0.5-3.5% of 4-methyl-5-propyl vinylene carbonate, 3-5.2% of trimethylene sulfite, and 0.01-0.45% of methyl tertiary butyl ether. The electrolyte adopts a four-solvent system, so that the electrolyte has proper dielectric constant and viscosity; the four functional additives are added to form an SEI film with compactness and stability, meanwhile, the stability of the high-temperature SEI film at high temperature can be improved, and the high-temperature resistance of the electrolyte can be improved; the conductivity of the electrolyte is high, and the rate and the power characteristic of a lithium iron phosphate power battery can be improved effectively; the lithium ion power battery can be stored at high-temperature state, the capacity retention ratio and the capacity recovery rate are high, and the cycle performance is good.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to an electrolyte solution of a lithium-ion power battery and an application thereof. Background technique [0002] Due to the advantages of high energy density, high working voltage, long cycle life, high power, and environmental friendliness, lithium-ion batteries have become a hot research topic in the field of new energy. With the rapid development of lithium-ion batteries and the demand for large-capacity lithium-ion batteries for electric vehicles, it is urgent to develop lithium-ion power batteries with high safety, high capacity, high power, long life and environmental protection. Lithium iron phosphate power battery has the advantages of high working voltage, high specific capacity, long cycle life, low price and environmental friendliness, and gradually occupies a dominant position in the lithium-ion power battery market. [0003] As an important part of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0569H01M10/0525
CPCH01M10/0567H01M10/0569Y02E60/10
Inventor 马伟华曹长河潘美姿
Owner NINGBO VEKEN BATTERY
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