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Oxidation reduction shuttle used as lithium ion battery overcharge protecting agent

A lithium-ion battery and electrolyte additive technology, applied in the field of electrochemical energy storage, can solve the problems of reducing molecular stability, unable to provide overcharge protection, etc., and achieve the effect of improving oxidation potential

Active Publication Date: 2015-07-29
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the asymmetric structure of the molecule improves the solubility of the molecule in the electrolyte, it cannot provide long-term overcharge protection because of the reduced stability of the molecule.

Method used

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  • Oxidation reduction shuttle used as lithium ion battery overcharge protecting agent
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  • Oxidation reduction shuttle used as lithium ion battery overcharge protecting agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1. The preparation of the redox shuttle used as an overcharge protection agent for lithium-ion batteries

preparation Embodiment 1

[0022] Preparation Example 1: Synthesis of 2,5-di-tert-butyl-1,4-dinitrile propoxybenzene (DBDCEB)

[0023]

[0024] Add 2,5-di-tert-butylhydroquinone (0.1mol, 222.32g / mol, 22.23g), acrylonitrile (1mol, 53.06g / mol, 53.06g), 5% Potassium carbonate solution (0.01mol, 138.21g / mol, 1.4g) and 10% isobutanol (0.02mol, 74.12g / mol, 1.48g). The resulting mixture was heated to reflux for 8 hours. Another 5% potassium carbonate solution (0.01mol, 138.21g / mol, 1.40g) was added to the reaction system, and after 36 hours of reaction, 85% phosphoric acid (0.016mol, 98.0g / mol, 1.84 g) Stir for half an hour to neutralize. Excess acrylonitrile was removed by distillation under reduced pressure. The obtained crude product was diluted with dichloromethane (75 mL) and washed with 0.1M NaOH solution. After the organic layer was concentrated, the pure product was obtained by recrystallization, yield: 70%.

[0025] 1 H NMR (400MHz, CDCl 3 ): δ / ppm, 6.81(s, 2H, Ar-H), 4.25(s, 4H, CH 2 CN),2...

preparation Embodiment 2

[0027] Preparation Example 2: Synthesis of 2-5-di-tert-butyl-1,4-ditrimethylsilyloxybenzene (DBDTMSB)

[0028]

[0029] Add 2,5-di-tert-butylhydrobenzoquinone (0.1mol, 222.32g / mol, 22.23g) and acetonitrile (100mL) into a flame-dried three-neck flask. After hexamethyldisilazane (HMDS) was added dropwise to the reaction system, it was heated to reflux for 16 hours. The pure product was obtained by recrystallization, yield: 85%.

[0030] 1 H NMR (400MHz, CDCl 3 ): δ / ppm, 6.70(s, 2H, Ar-H), 1.36(s, 18H, -C(CH 3 ) 3 ),0.33(s,18H,-Si(CH 3 ) 3 );

[0031] 13 C NMR (100MHz, CDCl 3 ):147.30,136.87,117.40,34.07,29.63,0.77;

[0032] 29 Si NMR (50MHz, CDCl 3 ): 15.56.

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PUM

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Abstract

The invention discloses an oxidation reduction shuttle used as a lithium ion battery overcharge protecting agent, and application of the oxidation reduction shuttle. The structural formula of the oxidation reduction shuttle is as shown in formula I in the specification. In the formula, R is selected from any one of -CH2CH2CN, -Si(CH3)3, -S(O)2CH3, -S(O)2CF3, -C(O)CH3. Polar groups (such as cyan, an ester group and sulfonyl) are introduced into the oxidation reduction shuttle, so that the oxidation potential of the oxidation reduction shuttle can be increased, and the solubility and the stability of the oxidation reduction shuttle in electrolyte can be improved. As a lithium ion battery electrolyte additive, the oxidation reduction shuttle can be applied to lithium ion batteries.

Description

Technical field: [0001] The invention relates to the field of electrochemical energy storage, in particular to a redox shuttle used as an overcharge protection agent for lithium ion batteries. Background technique: [0002] The safety issue is the main obstacle preventing the large-scale application of lithium-ion batteries in the field of new energy vehicles and new energy development, as well as in the field of grid energy storage. Among safety issues, overcharge damage of lithium-ion batteries is a common and dangerous phenomenon. As the name implies, overcharging is when the current continues to force through the battery when the energy storage capacity of the battery is full, resulting in the release of oxygen from the positive electrode material in a thermodynamically and kinetically unstable state and the decomposition of the electrolyte on the surface of the highly oxidative positive electrode. Can cause serious safety incidents, such as fire and explosion. A commo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42
CPCH01M10/0525H01M10/0567H01M10/42Y02E60/10
Inventor 张灵志汪靖伦雍天乔
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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