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Silicon carbon material as well as preparation method and application thereof

A technology of silicon carbon material and carbon source, applied in the field of silicon carbon material and its preparation, can solve the problems of poor cycle performance of silicon carbon negative electrode and the like

Pending Publication Date: 2022-04-19
GUANGDONG BRUNP RECYCLING TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing silicon carbon negative electrode still has the problem of poor cycle performance

Method used

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  • Silicon carbon material as well as preparation method and application thereof
  • Silicon carbon material as well as preparation method and application thereof
  • Silicon carbon material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] In this embodiment, a silicon carbon material is prepared, and the specific process is as follows:

[0088] A1. Preparation of MOF materials:

[0089] A1a. Weigh zinc nitrate hexahydrate, hydroxyethylidene diphosphonic acid (C 2 h 8 o 7 P 2 , HEDP, CAS: 2809-21-4) and pyrazine (C 4 h 4 N 2 , CAS: 290-37-9), the total mass of these three substances is 5.936g, then add 5mL of N,N-dimethylformamide (DMF), stir and mix evenly;

[0090] A1b. Put the mixture obtained in step A1a into a ceramic pot, add ceramic beads of the same weight, and perform ball milling with a planetary ball mill at a speed of 300 rpm, forward and reverse (both speeds are 300 rpm), and ball mill for 0.5 h;

[0091] A1c. The product obtained in step A1b was centrifugally filtered, washed several times with distilled water and ethanol solution, and dried at 80° C. for 12 hours to obtain a Zn-MOF precursor;

[0092] A2. Preparation of silicon carbon materials:

[0093] A2a. Weigh nano-silicon (wi...

Embodiment 2

[0097] In this embodiment, a silicon carbon material is prepared, and the specific process is as follows:

[0098] A1. Preparation of MOF materials:

[0099] A1a. Weigh zinc nitrate hexahydrate, hydroxyethylidene diphosphonic acid (C 2 h 8 o 7 P 2 , HEDP, CAS: 2809-21-4) and pyrazine (C 4 h 4 N 2 , CAS: 290-37-9), the total mass of these three substances is 8.697g, then add 10mL of N,N-dimethylformamide (DMF), stir and mix evenly;

[0100] A1b. Put the mixture obtained in step A1a into a ceramic pot, add ceramic beads of the same weight, and perform ball milling with a planetary ball mill at a speed of 300 rpm, forward and reverse (both speeds are 300 rpm), and ball mill for 2 hours;

[0101] A1c. The product obtained in step A1b was centrifugally filtered, washed several times with distilled water and ethanol solution, and dried at 80° C. for 12 hours to obtain a Zn-MOF precursor;

[0102] A2. Preparation of silicon carbon materials:

[0103] A2a. Weigh nano-silicon ...

Embodiment 3

[0107] In this embodiment, a silicon carbon material is prepared, and the specific process is as follows:

[0108] A1. Preparation of MOF materials:

[0109] A1a. Weigh zinc nitrate hexahydrate, hydroxyethylidene diphosphonic acid (C 2 h 8 o 7 P 2 , HEDP, CAS: 2809-21-4) and pyrazine (C 4 h 4 N 2 , CAS: 290-37-9), the total mass of these three substances is 5.936g, then add 5mL of N,N-dimethylformamide (DMF), stir and mix evenly;

[0110] A1b. Put the mixture obtained in step A1a into a ceramic pot, add ceramic beads of the same weight, and perform ball milling with a planetary ball mill at a speed of 300 rpm, forward and reverse (both speeds are 300 rpm), and ball mill for 1 hour;

[0111] A1c. The product obtained in step A1b was centrifugally filtered, washed several times with distilled water and ethanol solution, and dried at 80° C. for 12 hours to obtain a Zn-MOF precursor;

[0112] A2. Preparation of silicon carbon materials:

[0113]A2a. Weighing nano-silicon ...

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Abstract

The invention discloses a silicon-carbon material as well as a preparation method and application thereof. The silicon-carbon material comprises an inner core and a shell wrapping the inner core, the inner core is silicon, and the shell is nitrogen and phosphorus co-doped porous carbon. According to the silicon-carbon material disclosed by the invention, through the design of the structure and doped atoms, the conductivity of the silicon-carbon material can be remarkably improved, and meanwhile, the volume change in the charge-discharge process when the silicon-carbon material is used as a negative electrode active material is inhibited; and finally, the cycle performance of the obtained silicon-carbon material is improved.

Description

technical field [0001] The invention belongs to the technical field of secondary batteries, and in particular relates to a silicon-carbon material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries (LIBs) are an important energy storage device due to their advantages of large capacity, light weight, and long life. There are many options for LIBs anodes, such as lithium metal (Li), graphite, silicon, silicon-carbon composites, tin selenide (SnSe x ), manganese tetraoxide (Mn 3 o 4 ), rhenium disulfide (ReS 2 )Wait. Among them, lithium metal anode has been extensively studied due to its advantages of large theoretical capacity, low density, and low redox potential. However, compared with other kinds of anodes, Li dendrites are a more serious problem in metallic Li anodes, and the growth of Li dendrites poses serious safety concerns, which hinders the practical application of metallic Li anodes. In addition, the most comm...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M10/0525
CPCH01M4/366H01M4/386H01M4/583H01M10/0525H01M2004/027Y02E60/10
Inventor 余海军陈江东谢英豪徐加雷李长东
Owner GUANGDONG BRUNP RECYCLING TECH
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