Electrolyte for lithium ion batteries and lithium ion battery containing same

A lithium-ion battery, electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., to achieve the effect of preventing gas swelling, good cycle performance, and high energy density

Active Publication Date: 2012-09-26
CHERY AUTOMOBILE CO LTD
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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 solve the gas swelling problem of the existing lithium-ion battery, and pro

Method used

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  • Electrolyte for lithium ion batteries and lithium ion battery containing same
  • Electrolyte for lithium ion batteries and lithium ion battery containing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] This embodiment provides a lithium ion battery.

[0044] 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% LiNi 0.5 mn 1.5 o 4 , 4% of small particles of conductive carbon black, 5% of polyvinylidene fluoride.

[0045] The composition of the negative electrode material of the lithium-ion battery (based on the mass fraction of the negative electrode material as 100%): 88% silicon-based alloy (Si-C), 2% small particle conductive carbon black and 2% large particle graphite powder, 8 % polyacrylic acid.

[0046] The composition of the electrolyte (the sum of the mass of the solvent and additives is 100%): the solvent is: 30% ethylene carbonate (EC), 30% diethyl carbonate (DEC), 35% fluoroethylene carbonate Ester (FEC);

[0047] The additives are: 2% ethylene sulfate (DTD) and 3% propylene sulfite (PS);

[0048] The electrolyte salt is: lithium hexafluorophosphate L...

Embodiment 2

[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%): 94% LiNi 0.5 mn 1.5 o 4 , 2% carbon fiber, 4% 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%): 92% silicon-based alloy (Si-C), 4% large particle graphite powder, and 4% 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: 40% diethyl carbonate (DEC), 53% ethyl methyl carbonate (EMC) 35-40;

[0062] The additives are: 5% ethylene sulfate (DTD) and 5% propylene sulfite (PS);

[0063] The electrolyte salt is: lithium hexafluorophosphate LiPF 6 , the concentration of the substance in the electrolyte is 1.2mol / L.

[0064] The preparation m...

Embodiment 3

[0068] This embodiment provides a lithium ion battery.

[0069] 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% LiNi 0.5 mn 1.5 o 4 , 3% carbon nanotubes, 4% polyvinylidene fluoride.

[0070] The composition of the negative electrode material of the lithium-ion battery (based on the mass fraction of the negative electrode material as 100%): 90% silicon-based alloy (Si-C), 3% small particle conductive carbon black, and 6% polyacrylic acid.

[0071] 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), 30% ethyl methyl carbonate (EMC), 35% Fluoroethylene carbonate (FEC);

[0072] The additive is: 7% ethylene sulfate (DTD);

[0073] The electrolyte salt is: lithium hexafluorophosphate LiPF 6 Lithium dioxalate borate LiBOB, Lithium hexafluorophosphate LiPF 6 The substance con...

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Abstract

This invention provides an electrolyte for lithium ion batteries and a lithium ion battery containing the same and belongs to the technical field of lithium ion batteries. According to the invention, the problems that the existing lithium ion battery has a gas expansion phenomenon, and is low in energy density and poor in cycle performance, and the like can be solved. The electrolyte for lithium ion batteries, provided by the invention, comprises a solvent, lithium salts and an additive, wherein the additive is one or two of ethylene sulfate and dioxathiane 2-oxide, and in the charge and discharge processes of a battery, the additive can absorb water entrained in electrodes well so as to form a thick solid electrolyte interface (SEI) film on the surface of a negative electrode, and can inhibit the decomposition of an electrode solution at high pressure, thereby inhibiting the occurrence of gassing, and simultaneously improving the electrochemical performance of the battery.

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 ion batteries and a lithium ion battery containing the electrolyte solution. Background technique [0002] Lithium-ion batteries have been widely used due to their high energy density, good cycle performance, environmental protection and pollution-free, and have become the preferred power batteries for electric vehicles and hybrid electric vehicles. With the gradual development of electric vehicles and hybrid electric vehicles, higher requirements are placed on the performance of lithium-ion batteries, which need to have the advantages of high energy density, good safety, and good low-temperature performance. [0003] At present, traditional lithium-ion batteries, such as lithium manganese oxide batteries, lithium iron phosphate batteries, and ternary batteries, are difficult to meet the requirements of electric vehicl...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 刘云建刘三兵朱广燕翟丽娟陈效华
Owner CHERY AUTOMOBILE CO LTD
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