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Low temperature electrolyte for lithium ion battery

A lithium-ion battery, electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as limiting the application range of lithium-ion batteries, and achieve good normal temperature charge-discharge performance and cycle stability, high electrical conductivity, The effect of increasing conductivity

Inactive Publication Date: 2008-08-27
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus greatly limiting the application range of lithium-ion batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Take 10% of ethylene carbonate (EC), 40% of dimethyl carbonate (DMC) and 2% of methyl formate (MF) by weight, and mix them well in a glove box with a humidity of less than 1%. Become electrolyte solvent, then, add the electrolyte salt LiPF that total amount is 0.8mol / L in stages 6 , after the electrolyte salt is fully dissolved, leave it aside for 24 hours; that is, the low-temperature electrolyte solution of the present invention is obtained.

[0037] After testing, in the obtained low-temperature electrolyte, the gram capacity of lithium manganate is greater than 100.7mAhg -1 , the discharge capacity at -20 and -40°C is greater than 96.0% and 81.0% of the normal temperature discharge capacity respectively, and the 1C discharge capacity at -40°C is greater than 60.6% of the normal temperature discharge capacity. The capacity retention rate of 100 cycles at room temperature is greater than 90.8%.

Embodiment 2

[0039] Take 27% of ethylene carbonate (EC), 63% of dimethyl carbonate (DMC) and 3.5% of methyl formate (MF) respectively by weight, mix well and evenly in a glove box with humidity less than 1%, and configure Become electrolyte solvent, then, add the electrolyte salt LiPF that total amount is 1.0mol / L in batches 6 , after the electrolyte salt is fully dissolved, leave it aside for 24 hours; that is, the low-temperature electrolyte solution of the present invention is obtained.

[0040] After testing, in the obtained low-temperature electrolyte, the gram capacity of lithium manganate is greater than 101mAhg -1 , the discharge capacity at -20 and -40°C is greater than 96.1% and 81.1% of the normal temperature discharge capacity respectively, and the 1C discharge capacity at -40°C is greater than 61% of the normal temperature discharge capacity. The capacity retention rate of 100 cycles at room temperature is greater than 91.3%.

Embodiment 3

[0042] Take 55% ethylene carbonate (EC), 85% ethyl methyl carbonate (EMC) and 5% methyl formate (MF) by weight, and mix well in a glove box with a humidity of less than 1%. , configured as an electrolyte solvent, and then, a total of 1.2mol / L electrolyte salt LiPF was added in portions 6 , after the electrolyte salt is fully dissolved, leave it aside for 24 hours; that is, the low-temperature electrolyte solution of the present invention is obtained.

[0043] After testing, in the obtained low-temperature electrolyte, the gram capacity of lithium manganate is greater than 100.5mAhg -1 , the discharge capacity at -20 and -40°C is greater than 96.0% and 80.8% of the normal temperature discharge capacity respectively, and the 1C discharge capacity at -40°C is greater than 60.7% of the normal temperature discharge capacity. The capacity retention rate of 100 cycles at room temperature is greater than 91.1%.

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Abstract

The invention provides low temperature electrolyte for lithium ion batteries, consisting of basal solvent, low viscosity carbonic esters, low viscosity and low melting point addition agent and lithium salts, by studying on main parameters of the electrolyte such as the melting point, the boiling point, the viscosity and the dielectric constant, etc., proper components and rates of the solvent are selected, and the particular addition agent of the low temperature electrolyte is selected, which obtains the electrolyte having desirable high temperature and low temperature charge-discharge performances and low temperature multiplying factor performance. The low temperature electrolyte for lithium ion batteries has the advantages of reasonable ratios of components, desirable normal temperature and low temperature charge-discharge performances, good normal temperature cyclical stability and good low temperature multiplying factor performance, and is applied to the industrialized production and can also be used as a renewal product for the low temperature electrolyte of the prior lithium ion batteries.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a low-temperature electrolyte for lithium ion batteries. Background technique [0002] Energy crisis, resource shortage, and environmental pollution are severe challenges facing human existence. Finding clean, renewable, and resource-saving secondary energy is an urgent task to achieve sustainable development of human society. [0003] Lithium-ion batteries have the advantages of high working voltage, high energy density, long cycle life, low self-discharge rate, and environmental protection, and have become the development trend of secondary batteries. It has been widely used in the power supply of portable electrical appliances such as wireless communication, digital camera, and notebook computer, and has broad application prospects in the power supply of special application fields such as aerospace, national defense and military industry, field operations, and su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40C07C69/96H01M10/0566
CPCY02E60/10
Inventor 刘云建郭华军李新海王志兴胡启阳彭文杰张云河杨勇梁如福
Owner CENT SOUTH UNIV
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