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A preparation of p, n co-doped c/sio by using silicon-containing biomass x A Green Approach to Composite Anode Materials for Li-ion Batteries

A technology for lithium-ion batteries and negative electrode materials, applied in the direction of active material electrodes, battery electrodes, negative electrodes, etc., can solve the problems of poor electrochemical performance, polluting the environment, cumbersome steps, etc., and achieve enhanced conductivity, large specific surface area, and ease The effect of volume expansion

Active Publication Date: 2021-11-26
河南大森林生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the silicon-carbon composite material obtained in this patented process step has poor electrochemical performance, and acid, magnesium powder and molten salt are used in the process step, polluting the environment, cumbersome steps, and high cost

Method used

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  • A preparation of p, n co-doped c/sio by using silicon-containing biomass <sub>x</sub> A Green Approach to Composite Anode Materials for Li-ion Batteries
  • A preparation of p, n co-doped c/sio by using silicon-containing biomass <sub>x</sub> A Green Approach to Composite Anode Materials for Li-ion Batteries
  • A preparation of p, n co-doped c/sio by using silicon-containing biomass <sub>x</sub> A Green Approach to Composite Anode Materials for Li-ion Batteries

Examples

Experimental program
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Embodiment 1

[0035] A preparation of P and N co-doped C / SiO by using silicon-containing biomass x A green method for lithium-ion battery composite negative electrode materials, comprising the following steps:

[0036] (1) Wash and dry the rice husk;

[0037] (2) crush the clean rice husk obtained in step (1), and pass through a 100-mesh sieve;

[0038] (3) Mix the clean rice husk obtained in step (2) with 85% concentrated H 3 PO 4 The solution is mixed evenly according to the mass ratio of 1:4, soaked for 10 hours, dried, put into a tube furnace with nitrogen as protective gas, and carbonized and activated at 500°C for 2 hours;

[0039] (4) Wash the carbonized biomass obtained in step (3) with distilled water and 1.0mol / L dilute KOH solution to remove the activator and by-products to obtain P-doped C / SiO xComposite material, 0≤x<2, while collecting the waste liquid generated;

[0040] (5) Doping the P-doped C / SiO obtained in step (4) x The composite material and urea were evenly mixe...

Embodiment 2

[0053] A preparation of P and N co-doped C / SiO by using silicon-containing biomass x A green method for lithium-ion battery composite negative electrode materials, comprising the following steps:

[0054] (1) Wash and dry the buckwheat husk;

[0055] (2) crush the clean buckwheat husk obtained in step (1), and pass through a 80-mesh sieve;

[0056] (3) Combine the clean buckwheat husk obtained in step (2) with 85% concentrated H 3 PO 4 The solution was mixed evenly at a mass ratio of 1:5, soaked for 24 hours, dried, placed in a tube furnace with nitrogen as a protective gas, and carbonized and activated at 550°C for 1.5 hours;

[0057] (4) Wash the carbonized biomass obtained in step (3) with distilled water and 1.5mol / L dilute KOH solution to remove activators and by-products to obtain P-doped C / SiO x Composite material, 0≤x<2, while collecting the waste liquid generated;

[0058] (5) Doping the P-doped C / SiO obtained in step (4) x The composite material and ammonium ni...

Embodiment 3

[0062] A preparation of P and N co-doped C / SiO by using silicon-containing biomass x A green method for lithium-ion battery composite negative electrode materials, comprising the following steps:

[0063] (1) Bamboo is washed and dried;

[0064] (2) crush the clean bamboo obtained in step (1), and pass through a 70-mesh sieve;

[0065] (3) Mix the clean bamboo obtained in step (2) with 85% concentrated H 3 PO 4 The solution was mixed evenly at a mass ratio of 1:6, soaked for 6 hours, dried, placed in a tube furnace with nitrogen as a protective gas, and carbonized and activated at 600°C for 1 hour;

[0066] (4) Wash the carbonized biomass obtained in step (3) with distilled water and 0.6mol / L dilute KOH solution to remove activators and by-products to obtain P-doped C / SiO x Composite material, 0≤x<2, while collecting the waste liquid generated;

[0067] (5) Doping the P-doped C / SiO obtained in step (4) x The composite material and ammonium carbonate were mixed evenly at ...

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Abstract

The invention discloses a method for preparing P and N co-doped C / SiO by using silicon-containing biomass x A green method for composite anode materials for lithium-ion batteries, first combining clean raw materials with concentrated H 3 PO 4 The solution is mixed evenly, soaked, dried, and activated by carbonization; the carbonized biomass is washed with distilled water and dilute KOH solution to obtain P-doped C / SiO x Composite material; the resulting P-doped C / SiO x The composite material is mixed evenly with nitrogen source, soaked, dried, and activated by carbonization; then washed with distilled water and dilute nitric acid solution, and dried in vacuum to obtain P, N co-doped C / SiO x Composite anode materials for lithium ion batteries. The material of the present invention overcomes existing C / SiO x For the first time, the defects of low coulombic efficiency and high resistance of lithium-ion battery composite anode materials have realized the maximum conversion of silicon-containing biomass into high-quality products, basically achieving zero emissions and zero pollution.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery materials, in particular to a method for preparing P and N co-doped C / SiO by using silicon-containing biomass x A green approach to composite anode materials for lithium-ion batteries. Background technique [0002] Lithium-ion batteries have high energy density, high average output voltage, small self-discharge, no memory effect, wide operating temperature range, excellent cycle performance, fast charging and discharging, high charging efficiency, large output power, long service life, and no Toxic and harmful substances and many other advantages are widely used in consumer electronics, military products, aviation products and other fields. The commonly used negative electrode material for lithium-ion batteries is graphite, which has good conductivity and a layered structure, which is very suitable for the intercalation and deintercalation of lithium ions, showing high Coulombic effic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/583H01M10/0525
CPCH01M4/366H01M4/38H01M4/483H01M4/583H01M10/0525H01M2004/027Y02E60/10
Inventor 崔金龙孙俊才敬毛锋
Owner 河南大森林生物科技有限公司