Sodium-ion battery carbon negative electrode material prepared based on waste wood chips and preparation method thereof

A technology of sodium ion battery and carbon negative electrode material, which is applied to battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of large sodium ion radius, poor sodium storage performance of graphite negative electrode materials, and high ionization potential, so as to reduce the defect concentration. , high coulombic efficiency and reversible specific capacity, the effect of reducing loss

Pending Publication Date: 2021-11-16
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large sodium ion radius and high ionization potential, graphite anode materials have poor sodium storage performance.

Method used

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  • Sodium-ion battery carbon negative electrode material prepared based on waste wood chips and preparation method thereof
  • Sodium-ion battery carbon negative electrode material prepared based on waste wood chips and preparation method thereof
  • Sodium-ion battery carbon negative electrode material prepared based on waste wood chips and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Step 1: ultrasonically wash biomass camphor wood chips with deionized water for 6 hours to remove dust and impurities, and dry the obtained product in a blast drying oven at 60°C for 24 hours to remove moisture;

[0033] Step 2: Transfer the dried camphor wood chips to a muffle furnace, raise the temperature to 300°C at a rate of 3°C / min in an air atmosphere and keep it warm for 2 hours, take it out after natural cooling with the furnace, and use a grinder to grind the The carbonized product is pulverized into powder and set aside;

[0034] Step 3: Put the pre-carbonized product into a tube furnace, and under the protection of inert gas argon, raise the temperature from room temperature 25°C to 1300°C at a rate of 1°C / min, keep it warm for 2 hours, and follow the furnace at a temperature of 5°C / min. Cool down to room temperature at a cooling rate of 1 min, take it out, grind it, and sieve it through a 325-mesh sieve;

[0035] Step 4: Pickling the obtained powder. The s...

Embodiment 2

[0037] Step 1: ultrasonically wash biomass camphor wood chips with deionized water for 6 hours to remove dust and impurities, and dry the obtained product in a blast drying oven at 60°C for 24 hours to remove moisture;

[0038]Step 2: Transfer the dried camphor wood chips to a muffle furnace, raise the temperature to 300°C at a rate of 3°C / min in an air atmosphere and keep it warm for 2 hours, take it out after natural cooling with the furnace, and use a grinder to grind the The carbonized product is pulverized into powder and set aside;

[0039] Step 3: Put the pre-carbonized product into a tube furnace, and under the protection of inert gas argon, raise the temperature from room temperature 25°C to 1300°C at a rate of 0.5°C / min, keep it warm for 2 hours, and follow the furnace at a temperature of 5°C / min. Cool down to room temperature at a cooling rate of 1 min, take it out, grind it, and sieve it through a 325-mesh sieve;

[0040] Step 4: Pickling the obtained powder. The ...

Embodiment 3

[0042] Step 1: ultrasonically wash biomass camphor wood chips with deionized water for 6 hours to remove dust and impurities, and dry the obtained product in a blast drying oven at 60°C for 24 hours to remove moisture;

[0043] Step 2: Transfer the dried camphor wood chips to a muffle furnace, raise the temperature to 300°C at a rate of 3°C / min in an air atmosphere and keep it warm for 2 hours, take it out after natural cooling with the furnace, and use a grinder to grind the The carbonized product is pulverized into powder and set aside;

[0044] Step 3: Put the pre-carbonized product into a tube furnace, and under the protection of inert gas argon, raise the temperature from room temperature 25°C to 1200°C at a rate of 0.25°C / min, keep it warm for 2 hours, and follow the furnace at a temperature of 5°C / min. Cool down to room temperature at a cooling rate of 1 min, take it out, grind it, and sieve it through a 325-mesh sieve;

[0045] Step 4: Pickling the obtained powder. Th...

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Abstract

The invention relates to a sodium-ion battery carbon negative electrode material prepared based on waste wood chips and a preparation method thereof. Waste wood chips are used as a biomass carbon source and subjected to pre-carbonization and low-heating-rate high-temperature carbonization treatment, metal heteroatoms are removed by washing with an acid pickling solution, and drying is performed to obtain a hard carbon sodium-ion battery negative electrode material. The waste wood chips are used as a biomass raw material, a large amount of chips generated in the production process of wood products can be fully utilized, and the material has the advantages of being environmentally friendly, low in cost and the like. A low-carbonization heating rate pyrolysis method is adopted, so that the effects of reducing defect concentration, increasing interlayer spacing and improving graphitization degree are achieved, and the electrochemical performance of the material is effectively improved. The hard carbon negative electrode material prepared by the method has relatively high first coulombic efficiency and reversible specific capacity, shows excellent cycling stability and rate capability, and is an ideal sodium-ion battery negative electrode material.

Description

technical field [0001] The invention belongs to the field of preparation of electrode materials for sodium ion batteries, in particular to a method for preparing high first-efficiency sodium ion battery carbon negative electrode materials based on waste wood chips, and the sodium ion battery carbon negative electrode materials obtained by the preparation method. Background technique [0002] With the rapid development of human society and the consumption of traditional fossil energy, the energy crisis and environmental pollution problems continue to intensify. Therefore, it is particularly important to develop efficient energy conversion methods and clean energy systems. At present, lithium-ion batteries have become a competitive new energy system due to their high power and energy density, long cycle life, and good safety, and are widely used in daily life such as smartphones, laptops, and electric vehicles. However, due to the urgent need to develop large-scale energy stor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05H01M4/133H01M4/587H01M10/054
CPCC01B32/05H01M4/587H01M4/133H01M10/054H01M2004/021H01M2004/027Y02E60/10
Inventor 胡章贵郭帅龙震纪效波陈以蒙郭世宏韩华玮姜修宝
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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