Phosphazene perfluoroalkanesulfonylimide lithium electrolyte and battery using electrolyte

A technology of lithium nitrile fluoroalkylsulfonylimide and fluorine-containing alkyl, applied in organic electrolytes, secondary batteries, composite electrolytes, etc., to achieve good compatibility, good thermal stability, hydrolysis resistance, and high electrical conductivity The effect of rate and oxidation potential

Active Publication Date: 2015-12-30
GUANGZHOU TINCI MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] So far, the research on imine compounds has mostly focused on containing a sulfonimide (-SO 2 NSO 2 On the chemical structure of -) unit, fluoroalkylsulfonimide and its related compounds containing phosphazene group have not been reported yet

Method used

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  • Phosphazene perfluoroalkanesulfonylimide lithium electrolyte and battery using electrolyte
  • Phosphazene perfluoroalkanesulfonylimide lithium electrolyte and battery using electrolyte

Examples

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Embodiment 1

[0023] (1) Preparation of electrolyte

[0024] in an argon atmosphere glove box (H 2 O<1ppm), the organic solvent is EC (ethylene carbonate): DMC (dimethyl carbonate): EMC (ethyl methyl carbonate) = 40: 40: 20 and (pentafluorophosphazene) (trifluorophosphazene) by mass ratio Methylsulfonyl)imide Lithium (1.0M) is mixed, add the VC (vinylene carbonate) of total weight 1%, the PS (propane sultone) of 2%, the FEC (fluoroethylene carbonate) of 3% ), 3% SN (succinonitrile). The above-mentioned raw materials are added in sequence, fully stirred evenly, and the lithium secondary battery electrolyte (free acid<15ppm, moisture<10ppm) of the present invention is obtained.

[0025] (2) Preparation of positive pole piece

[0026] Dissolve 3% polyvinylidene fluoride (PVDF) in 1-methyl-2-pyrrolidone solution, 94% LiCoO 2 and 3% conductive agent carbon black were added to the above solution and mixed evenly, and the mixed slurry was coated on both sides of the aluminum foil, dried and ro...

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Abstract

The invention provides a phosphazene perfluoroalkanesulfonylimide lithium electrolyte which includes a conductive lithium salt, a nonaqueous organic solvent and an additive, wherein the conductive lithium salt includes phosphazene perfluoroalkanesulfonylimide lithium with the structural formula being shown in the description. In the formula, M+ is Li, R1-5 = -OR7 or -M[NSO2-R6], R6 is fluorinated alkyl containing 1-8 carbon atoms, R7 is an alkanes group containing 1-10 carbon atoms. Phosphazene perfluoroalkanesulfonylimide lithium provided by the invention is good in thermal stability and hydrolysis resistance, has high electrical conductivity and oxidation potential in the traditional carbonate ester solution, and is good in compatibility with the extensively used electrode materials.

Description

technical field [0001] The invention relates to the field of lithium secondary batteries, and more specifically, the invention relates to a lithium secondary battery using an electrolyte solution containing lithium phosphazene fluoroalkylsulfonimide. Background technique [0002] Fluorine-containing alkylsulfonylimides and their alkali metal salts, especially lithium salts, are important fluorine-containing ion compounds, and are used as high-performance non-aqueous electrolyte materials for clean energy devices such as lithium-ion batteries, supercapacitors, and aluminum electrolytic capacitors. , and new high-efficiency catalysts and other fields, all have important industrial application value. [0003] At present, the research on fluorine-containing alkyl sulfonimides is mostly concentrated on monofluorine-containing sulfonimides (Coord.Chem.Revs., 1997, 158, 413.), that is, the anion structure contains a sulfonimide (- SO 2 NSO 2 -) unit, such as bis(fluoroalkylsulfo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0566H01M10/0563H01M10/0525
CPCH01M10/0525H01M10/0563H01M10/0568H01M2300/0025H01M2300/0088Y02E60/10
Inventor 韩鸿波仰永军罗乾万华平
Owner GUANGZHOU TINCI MATERIALS TECH
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