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Method of preparing g-C3N4/silicon carbon cathode material of lithium ion battery by electrostatic spinning and application thereof

A lithium-ion battery, electrospinning technology, applied in electrospinning, battery electrodes, secondary batteries, etc., can solve the problems of reducing the electrochemical activity of electrode materials, increasing the impedance of cycle performance materials, etc., to improve ion transmission speed, High specific capacity, reducing the effect of agglomeration

Active Publication Date: 2019-03-26
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These SEI films are electronic insulators (conductors for lithium ions), which have a large impact on cycling performance and can lead to increased resistance of the material
Thereby reducing the electrochemical activity of the electrode material

Method used

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  • Method of preparing g-C3N4/silicon carbon cathode material of lithium ion battery by electrostatic spinning and application thereof
  • Method of preparing g-C3N4/silicon carbon cathode material of lithium ion battery by electrostatic spinning and application thereof
  • Method of preparing g-C3N4/silicon carbon cathode material of lithium ion battery by electrostatic spinning and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] (1) Take the radio frequency plasma equipment to make nano-silicon particles

[0068] Put 10 g of commercially available coarse silicon powder (particle size: 200 mesh, 74 μm) into a radio frequency plasma system ( figure 1 A, 15KWInduction plasma system, Tekna Plasma Systems Co., Canada), and adjust the radio frequency current to 5.8A, and simultaneously turn on the inductively coupled plasma beam for argon, so that the cavity temperature reaches 9000°C, and the rough Silicon is gasified to obtain gaseous silicon, and then the steam valve of gaseous silicon is opened to introduce gaseous silicon into the liquid nitrogen cooling chamber (rapidly solidified through the condensation zone), and the cooling rate is 250°C / min to obtain cooled and condensed nano-silicon powder, nano-silicon The particle size is about 50-80nm.

[0069] (2) Measure 10ml of N,N-dimethylformamide (purity ≥ 99.9%), and then add 0.6g of polyvinylpyrrolidone (molecular weight: 1.3 million) into N,N...

Embodiment 2

[0078] (1) Take the radio frequency plasma equipment to make nano-silicon particles

[0079] Put 10 g of commercial coarse silicon powder (particle size: 200 mesh, 74 μm) into the ultra-high temperature inductive plasma system ( figure 1 A, 15KW Induction plasma system), and adjust the radio frequency current to 6.2A, synchronously turn on the inductively coupled plasma beam, make the cavity temperature to 11000°C, gasify the crude silicon to obtain gaseous silicon, and then turn on the gaseous silicon The steam valve introduces the gaseous silicon into the liquid nitrogen cooling chamber, (through the condensation zone is rapid solidification), the cooling rate is 350°C / min, and the cooled and condensed nano-silicon powder is obtained. The particle size of the nano-silicon is about 40-60nm.

[0080] (2) Measure 10ml of N,N-dimethylformamide (purity ≥ 99.9%), and then add 0.6g of polyvinylpyrrolidone (molecular weight: 1.3 million) into N,N-dimethylformamide, The mixture was ...

Embodiment 3

[0087] (1) Take the radio frequency plasma equipment to make nano-silicon particles

[0088] Put 10 g of commercial coarse silicon powder (particle size: 200 mesh, 74 μm) into the ultra-high temperature inductive plasma system ( figure 1 A, 15KW Induction plasma system), and adjust the radio frequency current to 7.3A, synchronously turn on the inductively coupled plasma beam, make the cavity temperature to 12000°C, gasify the crude silicon to obtain gaseous silicon, and then turn on the gaseous silicon The steam valve introduces the gaseous silicon into the liquid nitrogen cooling chamber (rapidly solidified through the condensation zone), and the cooling rate is 500°C / min to obtain the cooled and condensed nano-silicon powder. The particle size of the nano-silicon is about 30-50nm.

[0089] (2) Measure 10ml of N,N-dimethylformamide (purity ≥ 99.9%), and then add 0.6g of polyvinylpyrrolidone (molecular weight: 1.3 million) into N,N-dimethylformamide, Stir at 60°C for 3 hours ...

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Abstract

The invention discloses a method of preparing a g-C3N4 / silicon carbon cathode material of a lithium ion battery by electrostatic spinning and an application thereof. The method comprises the followingsteps: (1) adding polyvinylpyrrolidone into N,N-dimethylformamide to obtain a polyvinylpyrrolidone solution; (2) adding nano silicon into the polyvinylpyrrolidone solution to obtain a mixed solutionA; (3) adding urea into the mixed solution A to obtain a mixed solution B; (4) carrying out electrostatic spinning on the mixed solution B to obtain a silicon polymer composite material; and (5) putting the silicon polymer composite material in an inert gas environment, heating the material to 200-400 DEG C, keeping the temperature constantly for 3-6 hours, and heating the material to 500-700 DEGC and keeping the temperature constantly for 3-6 hours to obtain the g-C3N4 / silicon carbon cathode material of the lithium ion battery. The g-C3N4 / silicon carbon cathode material of the lithium ion battery has the advantages of being high in specific capacity, stable to recycle, good in rate performance and the like.

Description

technical field [0001] The invention belongs to the technical field of energy storage materials, in particular to a lithium-ion battery g-C prepared by electrospinning 3 N 4 The method and application of silicon carbon negative electrode material. Background technique [0002] Lithium batteries are currently widely used in portable electrochemical energy storage markets such as electric vehicles, mobile phones, laptops, and smart wearable devices. However, the market mainly uses lithium batteries with graphite-based negative electrode materials. However, with the continuous improvement of market requirements for energy density, safety, reliability, fast charging and cycle stability of lithium batteries, graphite (theoretical specific capacity is 372mAh g -1 ) cannot meet the market demand. In order to achieve high energy conversion efficiency and energy density, high-performance electrochemical energy storage technology has become a research hotspot. China attaches grea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/38H01M10/0525D01D5/00
CPCD01D5/003D01D5/0061D01D5/0084H01M4/362H01M4/386H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 沈楷翔陈和冬侯贤华
Owner SOUTH CHINA NORMAL UNIVERSITY
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