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Novel phosphine-containing isocyanate electrolyte additive and application thereof

An electrolyte additive, isocyanic acid technology, applied in non-aqueous electrolyte batteries, electrolyte battery manufacturing, circuits, etc., can solve the problems of accelerated battery performance, deterioration and failure, electrolyte decomposition, etc., to reduce reactions, reduce damage, improve effect of life

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

AI Technical Summary

Problems solved by technology

In the lithium-ion battery system, continuously increasing the battery operating voltage and operating temperature will lead to different degrees of electrolyte decomposition, thereby accelerating the deterioration and failure of battery performance.

Method used

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  • Novel phosphine-containing isocyanate electrolyte additive and application thereof
  • Novel phosphine-containing isocyanate electrolyte additive and application thereof
  • Novel phosphine-containing isocyanate electrolyte additive and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0035] Preparation of Synthetic Embodiment 1 Compound SP-01

[0036]

[0037] Add 62.0g (0.5mol) trimethyl phosphonite into a 250mL three-necked flask, control the internal temperature -5 ~ 0°C, slowly add 72.2g (0.51mol) sulfonyl chloride isocyanate dropwise, about 1.0hrs dropwise, drop After the addition, keep warm at 0°C for 1 hour, slowly raise the temperature to 105-110°C, stir and react for 6.0 hrs, remove the solvent under reduced pressure until there is no fraction to obtain a dark brown oil, and further rectify under reduced pressure to obtain 34.4 g of a colorless viscous oil Compound SP-01, yield 32.00%.

[0038] GC-MS: 215, 1 H NMR (400MHz): solvent deuterated chloroform, δ (ppm): 3.831 ~ 3.854ppm (d, 6H); 3 1 PNMR (162MHz): solvent deuterated chloroform, δ (ppm): -19.61ppm;

[0039] Preparation of Synthetic Embodiment 2 Compound SP-07

[0040]

[0041]Add 84.9g (0.60mol) of sulfonyl chloride isocyanate into a 250mL three-necked flask, control the interna...

Embodiment 1-10 and comparative example 1～5

[0056] The method that battery embodiment 1-10 and comparative example 1~5 lithium-ion battery non-aqueous electrolytes are used to prepare lithium-ion type button battery is:

[0057] (1) Preparation of positive electrode sheet

[0058] LiCoO 2 Cathode material as an example: the positive electrode LiCoO 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 LiCoO 2 Cathode material. Bake at 120°C for 12 hours, in the dried pole piece, LiCoO 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 LiMn 2 o 4 、LiNi 0.8 co 0.1 mn 0.1 o 2 Prepare in the same way.

[0059] (2) Negative sheet preparation...

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Abstract

The invention relates to a novel phosphine-containing isocyanate electrolyte additive, and belongs to the technical field of lithium battery non-aqueous electrolyte additives. The structural formula of the electrolyte additive is as shown in a formula I, wherein R is selected from methyl, ethyl, trifluoroethyl, propyl, isopropyl, allyl, propynyl, phenyl, alkyl-containing phenyl, fluorine-containing alkyl phenyl, alkyloxy-containing phenyl, fluorine-containing alkyloxy-containing phenyl, phenyl containing fluorine atoms or cyano, alkyl containing cyano atoms and having 1-4 carbon atoms, and trimethylsilyl; the silicon group is one of triethyl silicon group, trimethoxy silicon group and unsaturated bond-containing alkyl silicon group. The phosphine-containing isocyanate electrolyte additive is prepared into the non-aqueous electrolyte of the lithium battery, and the non-aqueous electrolyte shows good flame retardant property; and when the composite material is further applied to the lithium ion battery, the battery has good high-temperature storage performance, normal-temperature cycle performance and high-temperature cycle performance under high voltage.

Description

technical field [0001] The invention relates to a novel phosphine-containing isocyanate electrolyte additive and application thereof, and belongs to the technical field of lithium battery non-aqueous electrolyte additives. Background technique [0002] Due to its irreplaceable advantages such as low self-discharge rate, long cycle life, high working voltage, and low pollution, lithium-ion batteries have been widely used in daily life as power sources. Whether it is in mobile communications, notebook computers, or new energy vehicles, it has broad prospects. At the same time, users have also put forward requirements for lithium-ion batteries such as high energy density and fast charging. In the lithium-ion battery system, continuously increasing the battery operating voltage and operating temperature will lead to different degrees of electrolyte decomposition, thereby accelerating the deterioration and failure of battery performance. [0003] During the first charge and dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F9/655C07F9/165H01M10/0525H01M10/0567H01M10/058H01M10/42
CPCC07F9/65517C07F9/65522C07F9/1657C07F9/1654H01M10/0567H01M10/058H01M10/0525H01M10/4235Y02E60/10Y02P70/50
Inventor 付少邦宫园园林存生宣力琪程宝全石宇
Owner VALIANT CO LTD
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