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Method for preparing sodium-ion battery negative electrode material with sodium alga acid as carbon source

A sodium ion battery, sodium alginate technology, applied in battery electrodes, non-aqueous electrolyte batteries, circuits, etc., can solve the problems of low volume expansion of battery capacity, and achieve high repeatability, strong cycle stability, and simple operation. Effect

Active Publication Date: 2016-10-19
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a kind of method that uses sodium alginate as carbon source to prepare the negative electrode material of sodium ion battery, to overcome the defect that the above-mentioned prior art exists, the sodium alginate derivative carbon material prepared by the present invention is used as the room temperature sodium ion battery The negative electrode material can overcome the problems of low battery capacity and serious volume expansion effect of bulk carbon materials, and has the characteristics of strong cycle stability and high battery capacity

Method used

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  • Method for preparing sodium-ion battery negative electrode material with sodium alga acid as carbon source
  • Method for preparing sodium-ion battery negative electrode material with sodium alga acid as carbon source
  • Method for preparing sodium-ion battery negative electrode material with sodium alga acid as carbon source

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Embodiment 1

[0028] Weigh 2.0g of sodium alginate and add it to 50ml of deionized water, heat to 60°C and magnetically stir for 0.5h to obtain a uniform viscous liquid, freeze-dry the obtained uniform viscous liquid for 72 hours to obtain a spongy seaweed with a loose structure Sodium alginate; in an Ar atmosphere, the spongy sodium alginate was raised to 600°C at a rate of 2°C / min, calcined for 2 hours, and naturally cooled to room temperature after calcination, then soaked in 2mol / L hydrochloric acid until neutral , filtered by suction, washed with water and ethanol until neutral, and then vacuum-dried at 60° C. for 12 hours to obtain a negative electrode material for a sodium ion battery.

Embodiment 2

[0030] Weigh 10g of sodium alginate and add it to 250ml of deionized water, heat to 90°C and magnetically stir for 3 hours to obtain a uniform viscous liquid, freeze-dry the obtained uniform viscous liquid for 72 hours to obtain a spongy sodium alginate with a loose structure ;The spongy sodium alginate is raised to 1000°C at a heating rate of 2°C / min under an Ar atmosphere, and calcined for 12 hours. After the calcination is completed, it is naturally cooled to room temperature, soaked in 2mol / L nitric acid until neutral, and passed Suction filtration, washing with water and ethanol until neutral, and then vacuum drying at 100° C. for 12 hours to obtain a negative electrode material for a sodium ion battery.

Embodiment 3

[0032] Weigh 2.0g of sodium alginate and add it to 50ml of deionized water, heat to 80°C and magnetically stir for 3 hours to obtain a uniform viscous liquid, freeze-dry the obtained uniform viscous liquid for 12 hours to obtain a spongy alginic acid with a loose structure Sodium; the spongy sodium alginate in N 2 Under atmosphere, heat up to 600°C at a rate of 2°C / min, calcinate for 2 hours, cool to room temperature naturally after calcination, soak in 2mol / L nitric acid until neutral, then wash with water and ethanol until neutral through suction filtration , and then carry out vacuum drying at 100° C. for 12 hours to obtain a negative electrode material for a sodium ion battery.

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Abstract

The invention discloses a method for preparing a sodium-ion battery negative electrode material with sodium alga acid as a carbon source. The method comprises the steps that sodium alga acid is dissolved in deionized water at first, the temperature is kept at 60-90 DEG C in the whole process, stirring is carried out, and even viscous liquid is obtained, wherein 0.8-20 g of sodium alga acid is dissolved in each 100 mL of deionized water; the obtained even viscous liquid is frozen and dried to obtain the spongy sodium alga acid with a loose structure; finally, the obtained spongy sodium alga acid is roasted in the inert atmosphere and cooled to room temperature after roasting is finished, dilute acid soaking is carried out, the sodium alga acid is washed with water and ethyl alcohol to be neutral through suction filtration, then, vacuum drying treatment is carried out, and the sodium-ion battery negative electrode material is obtained. The prepared sodium alga acid derivative carbon material is used as the room temperature sodium-ion battery negative electrode material, the problems that a bulk carbon material is low in battery capacity and serious in volume expansion effect can be solved, and the material has the advantages of being high in cycling stability and high in battery capacity.

Description

technical field [0001] The invention relates to a preparation method of a negative electrode material of a sodium ion secondary battery, in particular to a method for preparing a negative electrode material of a sodium ion battery by using sodium alginate as a carbon source. Background technique [0002] Since the 21st century, with the depletion of non-renewable fossil fuel resources such as coal, oil, and natural gas, and the environmental pollution caused by their combustion, energy and environmental issues have become a major bottleneck affecting the sustainable development of the world today. In order to solve this world problem, it is particularly urgent to seek renewable green energy to replace traditional fossil fuels and to seek the harmonious development of people and the environment. Lithium-ion secondary batteries have the advantages of high voltage, high specific energy, long cycle life, stable discharge performance, good safety, no pollution, and wide operating...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M10/05
CPCH01M4/583H01M10/05Y02E60/10
Inventor 曹丽云胡海玲许占位黄剑锋徐鹏飞付豪王浩王晶晶
Owner SHAANXI UNIV OF SCI & TECH
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