An electrolyte solution consisting of a solvent and an electrolyte

A technology of electrolyte and electrolyte, which is applied in the field of electrolyte, can solve the problems of limited application range, inferior comprehensive performance to carbonates, and small dosage, etc., and achieves the effect of flexible optionality and excellent electrochemical performance

Active Publication Date: 2021-12-24
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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  • An electrolyte solution consisting of a solvent and an electrolyte
  • An electrolyte solution consisting of a solvent and an electrolyte
  • An electrolyte solution consisting of a solvent and an 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 electrolytic solution composed of a solvent and an electrolyte, belonging to the field of electrolytic solutions. The solvent contains oxalic acid derivatives, and the mass percent content of the oxalic acid derivatives in the solvent ranges from 0.1% to 95%. The electrolyte described in the present application enriches the types of electrolyte solvents, has more flexible options when preparing electrolytes, has excellent electrochemical performance, and can be used in electrolytes used in high-temperature working environments.

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 Patents(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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