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A method for converting waste corn stalks into electrode materials for sodium-ion batteries

A sodium-ion battery, corn stalk technology, applied in battery electrodes, nanotechnology for materials and surface science, secondary batteries, etc. Good repeatability, enhanced cycle stability and rate performance, and improved sodium storage capacity

Active Publication Date: 2020-05-05
XUZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the processing of corn stalks produced by planting corn has always troubled people.
At present, the general methods for people to dispose of corn stalks are incineration and burial. These methods not only cause waste of resources but also cause damage to the environment to a certain extent.

Method used

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  • A method for converting waste corn stalks into electrode materials for sodium-ion batteries
  • A method for converting waste corn stalks into electrode materials for sodium-ion batteries
  • A method for converting waste corn stalks into electrode materials for sodium-ion batteries

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Embodiment 1

[0028] A method for converting waste corn stalks into high-performance sodium-ion battery electrode materials, comprising the following steps:

[0029] Step 1: Preliminarily refine the collected waste corn stalks, wash them with water and ethanol respectively, the mass ratio of distilled water / ethanol solution to corn stalks is 50:1 during cleaning, repeat 4 times, and wash each time for 30 minutes, Then air-dried at 80° C. for 12 hours to obtain clean and dry corn stalks.

[0030] Step 2: Transfer the corn stalks in step 1 to a high-temperature furnace, control the nitrogen flow rate to 100cm3 / min, raise the temperature to 1100°C at a heating rate of 3°C / min and keep it warm for 6h, and collect the product after natural cooling.

[0031] Step 3: The obtained material is refined by high-energy ball milling, passed through a 100-mesh sieve, and set aside. .

[0032] Step 4: Assemble the sodium ion battery electrode material according to step 6 in the summary of the invention,...

Embodiment 2

[0037] This embodiment provides a method for converting waste corn stalks into high-performance sodium-ion battery electrode materials, which includes the following steps:

[0038] Step 1: Preliminarily refine the collected waste corn stalks. The mass ratio of distilled water / ethanol solution to corn stalks is 50:1 during cleaning. Repeat 5 times, each cleaning time is 20 minutes, and then blow air at 100°C Dry for 24 hours to obtain clean and dry corn stalks.

[0039] Step 2: Transfer the corn stalks in step 1 to a high-temperature furnace, raise the temperature to 800°C at a heating rate of 5°C / min under the protection of nitrogen and keep it warm for 8h, control the airflow to 200cm3 / min, and collect the product after natural cooling.

[0040]Step 3: The obtained material is refined by high-energy ball milling, passed through a 200-mesh sieve, and set aside.

[0041] Step 4: Assemble the sodium ion battery electrode material according to step 6 in the summary of the invent...

Embodiment 3

[0044] This embodiment provides a method for converting waste corn stalks into high-performance sodium-ion battery electrode materials, which includes the following steps:

[0045] Step 1: Preliminarily refine the collected waste corn stalks, wash them with water and ethanol respectively, the mass ratio of distilled water / ethanol solution to corn stalks is 50:1 during cleaning, repeat 4 times, and wash each time for 30 minutes, Then air-dried at 80° C. for 12 hours to obtain clean and dry corn stalks.

[0046] Step 2: Transfer the corn stalks in step 1 to a high-temperature furnace, control the nitrogen flow rate to 100cm3 / min, raise the temperature to 1100°C at a heating rate of 3°C / min and keep it warm for 6h, and collect the product after natural cooling.

[0047] Step 3: 20% KOH solution was used in the activation process, and the mass of the substance to be activated: KOH was controlled to be 1:10, and the mixture was condensed and refluxed at 80°C for 4 hours. After the...

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Abstract

The invention discloses a method for converting waste corn straw into a sodium ion battery electrode material. The method specifically comprises: (a) collection and ultrasonic cleaning of waste corn straws: carrying out ultrasonic cleaning on corn straws for 10-30 min respectively with water and ethanol three times, and drying at a temperature of 60-100 DEG C; (6) high temperature carbonization: transferring the cleaned and dried straw into a high temperature furnace, heating to a temperature of 800-1200 DEG C under the protection of an inert atmosphere, carrying out a reaction for 2-8 h, naturally cooling, and collecting the product; (c) chemical activation: activating the collected product in 20% KOH, completely washing the activated product, and drying; and (d) air activation: calcining the chemically-activated and dried solid powder in a mixed gas atmosphere for 3 h to perform secondary activation, such that the waste corn straw can be converted into the porous carbon material, wherein the sodium ion battery assembled by using the porous carbon material as the negative electrode has advantages of good cycle stability, good rate performance, and high sodium storage capacity.

Description

technical field [0001] The invention relates to a method for converting waste corn stalks into electrode materials of sodium ion batteries. Background technique [0002] On the one hand, the total reserves of traditional fossil energy have been declining with the continuous increase of its mining volume, and on the other hand, the environmental pollution caused by the use process has become increasingly serious. Therefore, it is necessary to develop new clean energy to meet the needs of human development. . Since the promotion of lithium-ion batteries in 1990, this energy storage device has been widely used due to its many advantages such as high capacity density, power density, recyclability and environmental friendliness. At present, the uneven distribution and high price of lithium resources have become the bottleneck restricting the further development of lithium-ion batteries, and sodium, which is in the same main group as lithium, is considered to be the best alternat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/324C01B32/348H01M4/587H01M10/054B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01P2002/72C01P2004/03C01P2004/04C01P2004/64C01P2006/16C01P2006/40H01M4/587H01M10/054Y02E60/10
Inventor 王迎赖超王庆红王彤
Owner XUZHOU NORMAL UNIVERSITY
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