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Lithium ion battery electrolyte and lithium ion battery containing electrolyte

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of inability to meet the operation requirements of electric vehicles, restrict the promotion of electric buses, etc., and achieve the effects of reducing battery interface impedance, improving wettability, and improving composition.

Inactive Publication Date: 2018-01-05
CHAOYANG GUANGDA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing lithium iron phosphate low-temperature electrolyte patents mostly discharge at a rate of 0.2C or 0.5C, which cannot meet the actual operating requirements of electric vehicles in low-temperature environments
This severely restricts the promotion of electric buses in cold winter environments or in alpine regions

Method used

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  • Lithium ion battery electrolyte and lithium ion battery containing electrolyte
  • Lithium ion battery electrolyte and lithium ion battery containing electrolyte
  • Lithium ion battery electrolyte and lithium ion battery containing electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Preparation of lithium-ion battery electrolyte: mix EC, EMC, DEC, and methyl propionate evenly according to the volume ratio of 18 / 40 / 15 / 20, wherein EC, EMC, and DEC account for 59% of the total mass of the electrolyte, and propionic acid Methyl ester accounts for 18% of the total mass of the electrolyte, adding LiPF 6 and lithium bisfluorosulfonyl imide (LiFSI), so that the concentration of the two in the electrolyte is 0.85mol / L and 0.2mol / L respectively, adding VC, 0.5% potassium carbonate and 1.5% of the total mass of the electrolyte 2.0% fluoroethylene carbonate (FEC), that is, to obtain the final electrolyte product.

[0043] Preparation of Lithium-Ion Batteries: A known method for preparing lithium-ion batteries was used to prepare 20Ah and 1.4Ah iron phosphate lithium-ion batteries using the electrolyte prepared in this example. Figure 1~3 The discharge curve and cycle life curve of the lithium ion battery of this embodiment are provided. pass Figure 1-3 It...

Embodiment 2

[0045] Preparation of lithium-ion battery electrolyte: Mix EC, EMC, PC, and butyl acetate evenly according to the volume ratio of 15 / 30 / 18 / 40, wherein EC, EMC, and PC account for 51% of the total mass of the electrolyte, and butyl acetate Accounting for 37% of the total mass of the electrolyte, adding LiPF 6 and LiBF 4 , so that the concentrations of the two in the electrolyte are 0.95mol / L and 0.25mol / L respectively, add 1.5% of VC, 0.8% of vinyl sulfate, and 1.0% of 12-crown-4-ether and 0.5% fluorobenzene to obtain the final electrolyte product.

[0046] Preparation of Lithium-Ion Batteries: A known method for preparing lithium-ion batteries was used to prepare 20Ah and 1.4Ah iron phosphate lithium-ion batteries using the electrolyte prepared in this example.

Embodiment 3

[0048] Preparation of lithium-ion battery electrolyte: Mix EC, DMC, DEC, and methyl formate evenly according to the volume ratio of 17 / 35 / 15 / 43, wherein EC, DMC, and DEC account for 48% of the total mass of the electrolyte, and methyl formate Accounting for 39% of the total mass of the electrolyte, adding LiPF 6 and lithium difluorooxalate borate (LiODFB), so that the concentrations of the two in the electrolyte are 0.65mol / L and 0.45mol / L respectively, and 1.0% of vinyl sulfite and 0.5% of ethylene sulfate are added to the total mass of the electrolyte ester, 0.7% of 15-crown-5-ether and 1.0% of dialkyl carbonate to obtain the final electrolyte product.

[0049] Preparation of Lithium-Ion Batteries: A known method for preparing lithium-ion batteries was used to prepare 20Ah and 1.4Ah iron phosphate lithium-ion batteries using the electrolyte prepared in this example.

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Abstract

The invention provides a lithium ion battery electrolyte and a lithium ion battery containing the electrolyte. The lithium ion battery electrolyte includes lithium salt, a multi-element organic solvent, a film-forming additive, an SEI film shape modifier and an impregnating additive, the lithium salt is formed by selecting and mixing at least two of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium difluoroborate, lithium imidodisulfuryl fluoride and lithium bis(oxalate)borate, and the concentration of the lithium salt in the electrolyte is 0.75-1.5 mol / L. The lithium ion batteryis long in cycle life, good in high-temperature storage performance and long in cycle life at 55 DEG C, and excellent in low-temperature performance, and meets the requirements for various performances of power batteries in the actual running process of electric buses.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery electrolyte and a lithium ion battery containing the electrolyte. Background technique [0002] In recent years, with the rapid development of China's economy, the rapid increase of comprehensive national strength, and the improvement of people's living standards year by year, the number of car ownership and sales has increased rapidly, and the demand for oil has increased significantly, resulting in a sharp increase in dependence on foreign oil. Petroleum is a non-renewable strategic resource, and the products of petroleum combustion also lead to environmental problems such as increased pollution, a substantial increase in greenhouse gas emissions, and increasingly serious smog problems. In this context, China has listed new energy vehicles as a national strategic emerging industry during the 13th Five-Year Plan. The leapfrog development of t...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0568H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/0568H01M10/0569H01M2220/20H01M2300/0025Y02E60/10
Inventor 吴凯卓尚晓锋王美
Owner CHAOYANG GUANGDA CHEM
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