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Electrolyte solution composed of solvent and electrolyte

An electrolyte and electrolyte technology, applied in the field of electrolyte, can solve the problems of not wide application range, not as good as carbonate in comprehensive performance, small dosage, etc., and achieve the effect of flexible selectivity and excellent electrochemical performance.

Active Publication Date: 2020-01-21
宁波梅山保税港区锂泰企业管理合伙企业(有限合伙)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Carboxylate solvents are also occasionally used as solvents in the electrolyte of secondary batteries, but because the overall performance is not as good as that of carbonates, the dosage is not large and the application range is not wide

Method used

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  • Electrolyte solution composed of solvent and electrolyte
  • Electrolyte solution composed of solvent and electrolyte
  • Electrolyte solution composed of solvent and electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: Under anhydrous inert atmosphere, compound 9.5g and 0.5g of dimethyl carbonate were mixed, and then 1.5g of lithium hexafluorophosphate was slowly added. Stir to dissolve lithium hexafluorophosphate to obtain an electrolytic solution.

[0032] The nickel-cobalt-manganese ternary lithium-rich material is used as the positive electrode, the metal lithium sheet is used as the negative electrode, and the PP / PE composite film is used as the diaphragm, and the above-mentioned electrolyte is used to make a button battery (diameter 20mm, thickness 3.2mm). The charge and discharge curve is as figure 1 shown.

Embodiment 2

[0033] Embodiment 2: under anhydrous inert atmosphere, compound 9.5g and 0.5g of propylene carbonate were mixed, and then 1.5g of lithium hexafluorophosphate was slowly added. Stir to dissolve lithium hexafluorophosphate to obtain an electrolytic solution.

[0034] The nickel-cobalt-manganese ternary lithium-rich material is used as the positive electrode, the metal lithium sheet is used as the negative electrode, and the PP / PE composite film is used as the diaphragm, and the above-mentioned electrolyte is used to make a button battery (diameter 20mm, thickness 3.2mm). The charge and discharge curve is as figure 2 shown.

Embodiment 3

[0035] Embodiment 3: under anhydrous inert atmosphere, compound 3g, 4g of dimethyl carbonate, and 3g of propylene carbonate were mixed, and then 1.5g of lithium hexafluorophosphate was slowly added. Stir to dissolve lithium hexafluorophosphate to obtain an electrolytic solution.

[0036] The lithium titanate material is used as the positive electrode, the metal lithium sheet is used as the negative electrode, and the PP / PE composite film is used as the diaphragm, and the above electrolyte is used to make a button battery (diameter 20mm, thickness 3.2mm). Cyclic curves such as image 3 As shown, the theoretical gram capacity of lithium titanate is 175mAh, which is determined by image 3 It can be seen that the electrolyte solution used in Example 3 makes the gram capacity of lithium titanate fully utilized, which is close to 175mAh; there is no sign of decay during 20 cycles.

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Abstract

The invention relates to an electrolyte solution composed of a solvent and an electrolyte, and belongs to the field of electrolytes. The solvent contains an oxalic acid derivative, and the mass percentage of the oxalic acid derivative in the solvent ranges from 0.1% to 95%. The electrolyte disclosed by the invention enriches the types of electrolyte solvents, is more flexible in selectivity and excellent in electrochemical performance when the electrolyte is blended, and can be applied to the electrolyte used in a high-temperature working environment.

Description

Technical field: [0001] The invention relates to an electrolytic solution composed of a solvent and an electrolyte, belonging to the field of electrolytic solutions. Background technique: [0002] Secondary batteries mainly include lithium batteries and sodium batteries, and the electrolyte solvents of both are mainly composed of mixed carbonate systems. The currently used carbonate solvents mainly include dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, ethylene carbonate, and propylene carbonate. Carboxylate solvents are also occasionally used as solvents in the electrolyte of secondary batteries, but because the overall performance is not as good as that of carbonates, the amount of use is not large and the scope of application is not wide. [0003] Non-aqueous electrolyte solvents used in capacitors, hybrid capacitors, etc., in addition to carbonates, γ-butyrolactone (belonging to carboxylic acid esters), acetonitrile, N,N-dimethylformamide, N,N-dimethylac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0569H01M10/0568H01M10/0567H01M10/052H01G11/62H01G11/60H01G11/64
CPCH01M10/0569H01M10/0568H01M10/0567H01M10/052H01G11/62H01G11/60H01M2300/0025Y02E60/10
Inventor 申大卫陈夏成
Owner 宁波梅山保税港区锂泰企业管理合伙企业(有限合伙)
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