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Electrolyte for lithium battery and lithium ion battery comprising same

A lithium battery and electrolyte technology, applied in the field of lithium battery electrolyte, can solve the problems of lithium ion battery capacity attenuation and other problems, achieve the effect of ensuring cycle characteristics and storage performance, and preventing decomposition

Inactive Publication Date: 2013-07-24
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of capacity decay in storage of existing lithium-ion batteries, and to provide an electrolyte for lithium batteries that can improve battery capacity retention

Method used

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  • Electrolyte for lithium battery and lithium ion battery comprising same

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Embodiment 1

[0037] This embodiment provides a lithium ion battery.

[0038] The composition of the positive electrode material of the lithium-ion battery (based on the mass fraction of the positive electrode material as 100%): 93% lithium iron phosphate, 3% carbon nanotubes, and 4% polyvinylidene fluoride.

[0039] The composition of the negative electrode material of the lithium-ion battery (based on the mass fraction of the negative electrode material as 100%): 94% graphite, 6% polyacrylic acid.

[0040] The composition of the electrolyte (based on the sum of the mass of the solvent and additives as 100%): the solvent is: 25% diethyl carbonate (DEC), 39.99% ethyl methyl carbonate (EMC), 35% Fluoroethylene carbonate (FEC);

[0041] Additive: 0.01% (DMSO);

[0042] The electrolyte salt is: lithium hexafluorophosphate LiPF 6 Lithium dioxalate borate LiBOB, Lithium hexafluorophosphate LiPF 6 The amount concentration of the substance in the electrolyte is 0.4 mol / L, and the amount concen...

Embodiment 2

[0049] This embodiment provides a lithium ion battery.

[0050]The composition of the positive electrode material of the lithium-ion battery (based on the mass fraction of the positive electrode material as 100%): 94% lithium iron phosphate, 2% carbon fiber, and 4% polyvinylidene fluoride.

[0051] The composition of the negative electrode material of the lithium-ion battery (based on the mass fraction of the negative electrode material as 100%): 92% graphite, 8% polyacrylic acid.

[0052] The composition of the electrolyte (based on the sum of the mass of the solvent and additives as 100%): the solvent is: 41% diethyl carbonate (DEC), 58% ethyl methyl carbonate (EMC);

[0053] The additives are: 0.5% dimethyl sulfoxide (DMSO) and 0.5% butyl sulfoxide;

[0054] The electrolyte salt is: lithium hexafluorophosphate LiPF 6 , the concentration of the substance in the electrolyte is 1.2mol / L.

[0055] The preparation method of the battery: the same as the preparation method of t...

Embodiment 3

[0058] This embodiment provides a lithium ion battery.

[0059] The composition of the positive electrode material of the lithium-ion battery (based on the mass fraction of the positive electrode material as 100%): 91% lithium iron phosphate, 4% small particle conductive carbon black, and 5% polyvinylidene fluoride.

[0060] The composition of the negative electrode material of the lithium-ion battery (based on the mass fraction of the negative electrode material as 100%): 93% graphite, 7% polyacrylic acid.

[0061] The composition of the electrolyte (based on the sum of the mass of the solvent and additives as 100%): the solvent is: 32% ethylene carbonate (EC), 30% diethyl carbonate (DEC), 35% fluoroethylene carbonate Ester (FEC);

[0062] The additives are: 1% dimethyl sulfoxide (DMSO), 1% butyl sulfoxide, 1% ethyl methyl sulfoxide (EMS);

[0063] The electrolyte salt is: lithium hexafluorophosphate LiPF 6 , where lithium hexafluorophosphate LiPF 6 The concentration of t...

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Abstract

The invention discloses an electrolyte for a lithium battery and a lithium ion battery comprising the same and belongs to the technical field of lithium ion batteries, and the lithium ion battery can be used for solving the problems of poor cycling performance and the like of an existing lithium ion battery. The invention provides an electrolyte used for a lithium battery and comprising a dissolvant, lithium salt and an additive, wherein the additive belongs to a sulfone compound. The sulfone compound serving as the additive is added to the electrolyte, so as to prevent a part of the electrolyte from being decomposed, so that the electrolyte has more stable electrochemical performance, and can ensure good cycle performance and excellent storage performance of the battery. In addition, the reduction potential of the cathode, positioned in the electrolyte, of the sulfone compound is about 1.0-1.5V and is lower than corresponding sulfite reduction potential, but higher than that of carbonic ester reduction potential. The sulfone compound, antecedent to solvate lithium ion intercalation, forms a film on a negative electrode interface (such as graphite) and can be used for improving the compatibility between a negative electrode and the electrolyte, and the formed solid electrolyte interface (SEI) film at the surface of the electrode is more stable.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to an electrolyte solution for lithium batteries and a lithium ion battery containing the electrolyte solution. Background technique [0002] Lithium-ion batteries have attracted people's attention because of their high energy density and good cycle performance. In the past 20 years, they have been developed rapidly. It has become the leading supporting power supply for portable electronic products such as mobile phones, digital cameras and notebook computers. At present, the application of lithium-ion batteries has expanded to miner's lamps, electric tools, electric bicycles, electric vehicles, household and power station energy storage batteries. In the above-mentioned application fields, lithium-ion batteries often need to be stored and put on hold. Like other secondary batteries, storage and hold-up will lead to attenuation of the capacity and rate per...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCY02E60/10
Inventor 朱广燕刘云建焦方方
Owner CHERY AUTOMOBILE CO LTD
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