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Cyclic amide-isocyanate-based composition and application thereof

A technology of isocyanate and cyclic amide, which is applied in the field of cyclic amide-isocyanate-based compositions, can solve problems such as damage to SEI, negative electrode interface film damage, and fire, and achieve the effects of improving surface stability, simple preparation method, and wide application prospects

Active Publication Date: 2019-04-16
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the volume of lithium metal changes greatly during charging and discharging, which leads to the extremely easy damage of the existing negative electrode interface film, causing uneven distribution of lithium ions at the interface between the negative electrode and the electrolyte, resulting in the deposition of dendritic lithium dendrites. On the one hand, lithium dendrites may pierce the battery insulating diaphragm, thereby causing a short circuit and causing fire and other safety hazards. On the other hand, the growth of lithium dendrites continues to destroy the SEI, resulting in increased side reactions and greatly shortening the battery cycle life.

Method used

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  • Cyclic amide-isocyanate-based composition and application thereof
  • Cyclic amide-isocyanate-based composition and application thereof
  • Cyclic amide-isocyanate-based composition and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The structural formula of compound A1 is: ; The structural formula of compound A2 is: ; The structural formula of compound A3 is: ; The structural formula of compound A4 is: ; The structural formula of compound A5 is: ; The structural formula of compound A6 is: .

[0023] The structural formula of compound B1 is: , R is: -C 3 h 6 -;

[0024] The structural formula of compound B2 is: , R is: -C 6 h 12 -;

[0025] The structural formula of compound B3 is: , R is: ;

[0026] The structural formula of compound B4 is: , R is: ;

[0027] The structural formula of compound B5 is: , R is:

[0028] The additive combination is shown in the table below:

[0029]

[0030] When using, only need to mix the substances in the table according to the corresponding proportion and then mix with the electrolyte, or directly add to the electrolyte.

Embodiment 2

[0031] Example 2: The electrolyte uses HR-8335 (Shandong Hairong) as the base liquid, and adds the cyclic amide-isocyanate-based composition of the present invention. The dosage in the following table refers to the mass percentage concentration of the composition in the base liquid.

[0032]

[0033] Preparation of lithium battery: Lithium iron phosphate (LFP) is used as the active material, and the conductive agent activated carbon (Super P) and the binder polyvinylidene fluoride (PVDF) are uniformly mixed in the nitrogen methyl pyrrolidone (NMP) solution, and the active material The mass ratio of activated carbon (Super P) and binder is 75:10:15 respectively, and then the aluminum foil is coated with a pressed sheet to obtain a positive electrode.

[0034] Use metal lithium sheet as the negative electrode, use PP / PE diaphragm, and use electrolyte 1-14 to assemble into CR2032 button lithium batteries 1-14a respectively. The control battery only uses HR-8335 (Shandong Hairo...

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PUM

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Abstract

The invention provides a cyclic amide-isocyanate-based composition and an application thereof. The composition mainly comprises the following components in mass percentage: 0.5-90% of a cyclic amid compound and 0.01-45% of an isocyanate compound, wherein the cyclic amid compound has a structural formula (as shown in the specification), and R1-4 are independent hydrogen, halogen, hydroxyl and aminostraight-chain or branch alkyl, the carbonic atom number of which is not greater than 12; and the isocyanate compound has a structural formula (as shown in the specification), and R is straight-chainor branch alkyl, the carbonic atom number of which is not greater than 20. By adoption of a cathode film forming additive combination formed by the cyclic amide and isocyanate compounds, a stable amide interface layer is generated on the surface of lithium metal, so that interface impedance can be reduced while the generation of lithium dendrites under heavy current is suppressed.

Description

technical field [0001] The present invention relates to a composition based on cyclic amide-isocyanate and its application. technical background [0002] Among many lithium-ion battery anode materials, metallic lithium has the highest theoretical capacity (3860 mAh g -1 ) and the lowest potential (-3.040 V vs. SHE), it is one of the most promising anode materials for next-generation high-energy-density batteries. However, the volume of lithium metal changes greatly during charging and discharging, which leads to the extremely easy damage of the existing negative electrode interface film, causing uneven distribution of lithium ions at the interface between the negative electrode and the electrolyte, resulting in the deposition of dendritic lithium dendrites. On the one hand, lithium dendrites may pierce the insulating diaphragm of the battery, which may cause a short circuit and lead to safety hazards such as fire. On the other hand, the growth of lithium dendrites continues...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235H01M2300/0025Y02E60/10
Inventor 刘杨王茜孙担担周晶晶郭炳焜
Owner SHANGHAI UNIV