Application of organosilicon compounds in the preparation of negative electrode materials for lithium-ion batteries

A lithium-ion battery and compound technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve problems such as battery cycle performance degradation, battery life reduction, active material shedding, etc., to eliminate difficult problems, volume The effect of small effect and low volume effect

Active Publication Date: 2021-03-05
HANGZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the charge-discharge cycle of silicon materials, the repeated intercalation and extraction of lithium ions causes the volume of silicon to change as high as 400%, causing the active material to fall off from the surface of the metal current collector and lose electrical contact, resulting in a decrease in the cycle performance of the battery, and finally leads to Reduced battery life and battery failure

Method used

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  • Application of organosilicon compounds in the preparation of negative electrode materials for lithium-ion batteries
  • Application of organosilicon compounds in the preparation of negative electrode materials for lithium-ion batteries
  • Application of organosilicon compounds in the preparation of negative electrode materials for lithium-ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The organosilicon compound (referred to as organosilicon compound 1) shown in the structure of formula (1) is applied to the steps of preparing lithium-ion battery negative electrode:

[0038] 1) Preparation of the negative electrode sheet: In an argon-protected glove box, the organosilicon compound 1, conductive carbon black, and polyvinylidene fluoride were mixed and ground into powder according to the mass ratio of 7:2:1, and dispersed in the solvent N- In methylpyrrolidone, ultrasonication for 1 hour and stirring for 3 hours at room temperature to make the powder evenly mixed in the solvent to make a slurry, apply the slurry evenly on the cleaned metal Cu sheet, turn it out of the glove box, and put it away quickly Put it in a vacuum oven at 120°C for 24 hours. Compact the dried negative electrode sheet with 10MPa on a tablet press, quickly transfer it to the glove box, and cut the negative electrode sheet into small discs with a diameter of 16mm with cutting pliers...

Embodiment 2

[0042] The organosilicon compound (referred to as organosilicon compound 2) shown in the structure of formula (2) is applied to the steps of lithium-ion battery negative electrode:

[0043] 1) Preparation of the negative electrode sheet: In an argon-protected glove box, mix and grind organosilicon compound 2, conductive carbon black, and polyvinylidene fluoride into powder according to a mass ratio of 7:2:1, and use N-formazol Based on pyrrolidone as solvent, ultrasonic for 1 hour and stirred for 3 hours at room temperature, the powder is mixed evenly in the solvent to make a slurry, and the slurry is evenly coated on a clean metal Cu sheet, transferred out of the glove box, and the sample is quickly Put it into a vacuum drying oven at 120° C. for 24 hours. Compact the dried negative electrode sheet with 10MPa on a tablet press, quickly transfer it to the glove box, and cut the negative electrode sheet into small discs with a diameter of 16mm with cutting pliers to obtain a lo...

Embodiment 3

[0047] The organosilicon compound (referred to as organosilicon compound 3) shown in the structure of formula (3) is applied to the steps of lithium-ion battery negative electrode:

[0048] 1) Preparation of the negative electrode sheet: Mix and grind organosilicon compound 3, conductive carbon black, and polyvinylidene fluoride into powder according to the mass ratio of 7:2:1, disperse them in the solvent N-methylpyrrolidone, and ultrasonicate at room temperature for 1 hours, and stirred for 3 hours, the powder was uniformly mixed in the solvent to make a slurry, and the slurry was evenly coated on the cleaned metal Cu sheet, transferred out of the glove box, and kept in a vacuum oven at 120°C for 24 hours. Compact the dried negative electrode sheet with 10MPa on a tablet press, quickly transfer it to the glove box, and cut the negative electrode sheet into small discs with a diameter of 16mm with cutting pliers to obtain a loading capacity of 1-2 mg / cm 2 of the negative elec...

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Abstract

The invention discloses an application of an organic silibinin compound in preparation of a lithium ion battery negative electrode material. Structural formula of the organic silibinin compound is shown in the specification. Ph is phenyl; tBu is a tert-butyl group; Si is + 2 valence; Si atoms have a pair of lone pair electrons and are active centers of the organic silibinin compound; Si and two adjacent N atoms respectively form a covalent bond and a coordination bond; and R is one of alkyl, aryl and silicon groups which do not contain lone pair electrons or one of amido, phosphino, alkoxy andhalogen which contain lone pair electron heteroatoms. The organic silibinin compound is used as an active material, has the properties of being combined with lithium ions and storing the lithium ions, and has good electrochemical activity and cycle performance. The electrochemical performance of the material can be regulated and controlled by changing the types of electron acceptors (alkyl, aryland the like) and electron donors (such as O, N, P, S, Cl and the like) of functional groups connected with silicon in the organic silibinin compound, and a key material is provided for the next generation of lithium ion battery technology.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to the application of a class of organosilicon compounds in the preparation of negative electrode materials for lithium ion batteries. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, high charging efficiency, fast discharge, low self-discharge, no memory effect, wide operating temperature range, high average output voltage, environmental friendliness, safety and reliability, etc. Scientists and technicians focus on the direction of research and development. As one of the core and key components of lithium-ion batteries, anode materials play an important role in the performance of lithium-ion batteries. [0003] The content of silicon in the earth's crust is as high as 28%, second only to oxygen. It is cheap and has a wide range of sources, so it is a very promising negative electrode material. However, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/60H01M4/13H01M4/139H01M4/04H01M10/0525
CPCH01M4/0404H01M4/043H01M4/13H01M4/139H01M4/60H01M10/0525Y02E60/10
Inventor 李岩刘雪王华兰
Owner HANGZHOU NORMAL UNIVERSITY
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