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Imidazole structure group-based isocyanate electrolyte additive and application thereof

An electrolyte additive and structure-based technology, which is applied in the field of electrolyte additives and non-aqueous electrolyte additives for lithium batteries, can solve the problems of high-temperature stability of batteries, easy discoloration, and easy rise of acid value, so as to suppress the rise of acidity and increase ions Conductivity, effect of suppressing chroma rise

Active Publication Date: 2022-03-01
VALIANT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the materials or electrolyte formulations recorded in these patents cannot solve the problems of high temperature stability of the battery and easy discoloration and acid value increase when used in combination with other sulfonate additives.

Method used

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  • Imidazole structure group-based isocyanate electrolyte additive and application thereof
  • Imidazole structure group-based isocyanate electrolyte additive and application thereof
  • Imidazole structure group-based isocyanate electrolyte additive and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0040] Preparation of Synthetic Embodiment 1 Compound ZN-01

[0041]

[0042] Add 33.6g (0.15mol) of KTDI, 42.4g (0.30mol) of sulfonyl chloride isocyanate and 150g of anhydrous acetonitrile into a 500mL three-necked flask, slowly raise the temperature to 75-80°C, and stir for 26.0hrs. Cool down, filter with suction, and desolventize the filtrate under reduced pressure until there is no distillate to obtain a brownish-yellow viscous substance. Purify it with n-heptane + methylene chloride to obtain 24.0 g of white solid ZN-01, with a yield of 55.00%.

[0043] GC-MS: 291, 13 C NMR (, 100MHz): solvent deuterated chloroform, δ (ppm): 115.7ppm (s, -CN), 119.8(q, -CF 3 ), 121.6(q, C=C), 122.4(s, N=C=O) 147.8(q, C-CF3).

[0044] Preparation of Synthetic Embodiment 2 Compound ZN-12

[0045]

[0046] Add 32.2g (0.10mol) of perfluorophenylimidazole potassium salt, 31.1g (0.22mol) of sulfonyl chloride isocyanate and 150g of anhydrous acetonitrile into a 500mL three-necked flask,...

Embodiment 1-9 and comparative example 1～6

[0063] Battery Examples 1-9 and Comparative Examples 1-6 Lithium-ion battery non-aqueous electrolytes are used to prepare lithium-ion type button batteries as follows:

[0064] (1) Preparation of positive electrode sheet

[0065] LiCoO 2 Cathode material as an example: the positive electrode LiNi 0.8 co 0.1 mn 0.1 o 2 Powder, carbon black (particle size 1000nm), polyvinylidene fluoride (PVDF) and N, N-dimethylpyrrolidone (NMP) were mixed to make a uniform slurry, and the slurry was uniformly coated on an aluminum foil (15 μm) set fluid, then dried and rolled to obtain LiNi 0.8 co 0.1 mn 0.1 o 2 Cathode material. Bake at 120°C for 12 hours, in the dried pole piece, LiNi 0.8 co 0.1 mn 0.1 o 2 Accounting for 94% of the total coating, the binder accounted for 4%, and carbon black accounted for 2%. Then the obtained pole piece was cut into a disc with a diameter of 8 mm as the positive pole. Other cathode materials LiFePO 4 Prepare in the same way.

[0066] (2) Neg...

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Abstract

The invention relates to an isocyanate electrolyte additive based on imidazole structure groups, and belongs to the technical field of lithium battery non-aqueous electrolyte additives, the structural formula of the electrolyte additive is as shown in formula I: R1, R2 and R3 are the same or different, r1, R2 and R3 are respectively and independently selected from one of hydrogen, methyl, ethyl, propyl, tertiary butyl, trifluoromethyl, trifluoroethyl, perfluoroethyl, perfluoropropyl, cyanoethyl, phenyl, fluorophenyl, cyanogroup-containing fluorophenyl, alkoxy-containing phenyl and alkyl-containing phenyl. The electrolyte additive is used for the lithium ion battery, the reduction of the battery capacity during high-temperature circulation and high-temperature storage is effectively inhibited, the decomposition and gas production of the electrolyte are inhibited, and the service life of the battery is greatly prolonged.

Description

technical field [0001] The invention relates to an electrolyte additive based on isocyanates of imidazole structural groups and an application thereof, belonging to the technical field of lithium battery non-aqueous electrolyte additives. Background technique [0002] Since the commercialization of lithium secondary batteries, due to its high specific energy and good cycle performance, it has been widely used in digital, energy storage, power, military aerospace and communication equipment and other fields. Compared with other secondary batteries, lithium secondary batteries have the advantages of high working voltage, long cycle life, low self-discharge rate, environmental friendliness, and no memory effect. [0003] In lithium-ion batteries, the oxidative decomposition of the electrolyte deteriorates battery performance, and is often accompanied by the dissolution of metal ions during cycling and high-temperature storage, resulting in a serious decline in battery performan...

Claims

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Application Information

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IPC IPC(8): C07D233/90C07D233/64C07D233/56H01M10/0525H01M10/0567H01M10/42
CPCC07D233/90C07D233/64C07D233/56H01M10/0525H01M10/0567H01M10/4235H01M2300/0025Y02E60/10H01M10/0569H01M10/0568H01M10/052
Inventor 付少邦林存生石宇张善国宣力琪姜恒
Owner VALIANT CO LTD
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