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Iamine-polyanion lithium salt and preparation method thereof as well as application of iamine-polyanion lithium salt as nonaqueous electrolyte

A polyanion and electrolyte technology, which is used in the application field of polyanion lithium salt as an electrolyte material in lithium ion batteries and secondary lithium batteries, can solve the problem of poor compatibility of metal lithium, concentration polarization, poor solubility, and inability to meet the requirements of two Lithium-ion battery application requirements and other issues

Inactive Publication Date: 2017-05-17
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] To sum up, in the prior art, non-aqueous electrolytes based on traditional small-molecule lithium salts generally have common technical defects such as poor compatibility with lithium metal and concentration polarization during battery charging and discharging, which cannot meet the requirements of secondary lithium batteries. application requirements
However, the existing reported polyanion lithium salts have poor solubility in organic solvents, and their electrical conductivity cannot meet the application requirements of lithium-ion batteries and secondary lithium batteries.

Method used

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  • Iamine-polyanion lithium salt and preparation method thereof as well as application of iamine-polyanion lithium salt as nonaqueous electrolyte
  • Iamine-polyanion lithium salt and preparation method thereof as well as application of iamine-polyanion lithium salt as nonaqueous electrolyte
  • Iamine-polyanion lithium salt and preparation method thereof as well as application of iamine-polyanion lithium salt as nonaqueous electrolyte

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Experimental program
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Effect test

Embodiment 1～6

[0056] Embodiments 1-6 relate to the preparation of polyanionic lithium salts containing "S-fluoroalkylsulfonylimide group"

Embodiment 1

[0057] Embodiment 1: the preparation of poly (p-styrenesulfonyl) (trifluoromethyl (S-trifluoromethylsulfonyl) sulfonyl) imide lithium salt

[0058] Add 3.00 g (6.63 mmol) (p-styrenesulfonyl) (trifluoromethyl(S-trifluoromethylsulfonimido)sulfonyl)imide lithium (LiSsTFSI) monomer to a 25 mL reaction flask, 0.021 g (0.13 mmol) of azobisisobutyronitrile (AIBN) and 5.0 g of refined acetonitrile. Pass argon to exhaust oxygen for 2h, and then react for 10h at 60°C under the protection of argon. After the reaction is completed, cool to room temperature, and slowly add the reaction solution dropwise to excess toluene under stirring to precipitate a colloidal solid, pour out the upper liquid, and repeat the dissolution and precipitation three times to obtain a gel-like Solid; vacuum-dry the viscous polymer at 80°C for 8 hours to obtain lithium poly(p-styrenesulfonyl)(trifluoromethyl(S-trifluoromethylsulfonylimide)sulfonyl)imide (LiPSsTFSI), yield 2.14 g (4.71 mmol), yield 71%.

Embodiment 2

[0059] Embodiment 2: Preparation of poly(p-styrenesulfonyl) (trifluoromethyl (S-trifluoromethylsulfonyl) sulfonyl) imide potassium salt

[0060] Add 4.11 g (8.48 mmol) (p-styrenesulfonyl) (trifluoromethyl (S-trifluoromethylsulfonimide) sulfonyl) potassium imide (KSsTFSI) monomer to a 25 mL reaction flask, 0.028 g (0.17 mmol) of azobisisobutyronitrile (AIBN) and 5.4 g of refined DMF. Pass argon to exhaust oxygen for 2h, and then react for 10h at 60°C under the protection of argon. After the reaction was completed, cool to room temperature, drop the reaction solution dropwise into rapidly stirred excess anhydrous diethyl ether (100mL), make it precipitate into a viscous solid, pour out the diethyl ether in the upper layer slowly, dissolve in this way, Precipitate three times to obtain a gel-like solid; the viscous polymer was vacuum-dried at 80°C for 8 hours to obtain poly(p-styrenesulfonyl)(trifluoromethyl(S-trifluoromethylsulfonylimide) )sulfonyl)imide potassium salt (KPSsTF...

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Abstract

The invention discloses an iamine-polyanion lithium salt and a preparation method thereof as well as application of the iamine-polyanion lithium salt as nonaqueous electrolyte. The invention provides the iamine-polyanion lithium salt containing 'S-fluoroalkylsulfonyamino'. The iamine-polyanion lithium salt has excellent dissolving capacity in nonaqueous solvents such as carbonate esters, ethers and ionic liquid; the nonaqueous electrolyte of the iamine-polyanion lithium salt has the advantages of high-temperature conductivity, high lithium ion transference number, no corrosion to an aluminum foil at high potential, good compatibility between the nonaqueous electrolyte and a metal lithium electrode and other widely-used electrode materials, and the like, and can be used for a lithium ion battery or a secondary lithium battery.

Description

technical field [0001] The invention belongs to the field of organic fluorine chemistry, organic polymer functional materials, new materials and advanced power supply technology, and specifically relates to a polyanion lithium salt containing "S-fluoroalkylsulfonylimide group" as an electrolyte material in a lithium ion battery and applications in secondary lithium batteries. Background technique [0002] As one of the key materials for energy storage devices such as high specific energy lithium-ion batteries and secondary lithium batteries, nonaqueous electrolytes have comprehensive properties, such as chemical and electrochemical stability, compatibility with positive and negative electrodes and separators, etc., directly Affect the use of lithium-ion batteries (referring to batteries that use lithium-intercalable materials as negative electrodes) and secondary lithium batteries (referring to batteries that directly use metallic lithium as negative electrodes). At present...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F112/14C08F8/44H01M10/0568H01M10/052H01M10/0525
CPCY02E60/10
Inventor 周志彬张恒聂进
Owner HUAZHONG UNIV OF SCI & TECH
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