Method for preparing negative electrode material for sodium-ion battery from KOH activated pomelo peel

A technology for sodium ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of high energy consumption, difficult control, and long reaction cycle in the reaction process, and achieve high capacity, improve efficiency, and reaction time. short effect

Inactive Publication Date: 2016-12-07
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above-mentioned high-temperature carbonization method needs to be activated in the air, or the process of immersion activation is required. There are disadvantages such as high energy consumption in the reaction process, difficult

Method used

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  • Method for preparing negative electrode material for sodium-ion battery from KOH activated pomelo peel
  • Method for preparing negative electrode material for sodium-ion battery from KOH activated pomelo peel
  • Method for preparing negative electrode material for sodium-ion battery from KOH activated pomelo peel

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Effect test

Embodiment 1

[0039] (1) Wash the pomelo peel of the biomass prefabricated body to remove surface impurities, and shred it to obtain a uniform block A with a diameter of 5 mm;

[0040] (2) Freeze-dry the uniform block A at 0°C for 36 hours to obtain block B;

[0041] (3) Take 0.5g of block B, add solid superacid to block B according to the mass ratio of B: solid superacid of 3:1, then add 40ml of ethanol solution, and magnetically stir for 1.5h to form a mixed solution C;

[0042] (4) Transfer the mixed solution C to a homogeneous hydrothermal reaction kettle, seal it and put it into a homogeneous reactor, heat up to 180°C at a heating rate of 15°C / min for hydrothermal reaction for 24 hours, then cool naturally to room temperature to obtain water Thermal product D, wherein the lining of the reactor is polytetrafluoroethylene, and the filling ratio of the reactor is 40%;

[0043] (5) After the precursor D was washed and filtered, the precursor D:KOH solid was mixed according to the mass rat...

Embodiment 2

[0047] (1) Wash the pomelo peel of the biomass prefabricated body to remove surface impurities, and shred it to obtain a uniform block A with a diameter of 3 mm;

[0048] (2) Freeze-dry the uniform block A at -20°C for 12 hours to obtain block B;

[0049] (3) Take 1g of block B, add solid superacid to block B according to the mass ratio of B: solid superacid of 2:1, then add 50ml of ethanol solution, and magnetically stir for 0.5h to form a mixed solution C;

[0050] (4) Transfer the mixed liquid C to a homogeneous hydrothermal reaction kettle, seal it and put it into a homogeneous reactor, heat up to 150°C at a heating rate of 15°C / min for hydrothermal reaction for 12 hours, then cool naturally to room temperature to obtain water Thermal product D, wherein the lining of the reactor is polytetrafluoroethylene, and the filling ratio of the reactor is 50%;

[0051] (5) After the precursor D was washed and filtered, the precursor D:KOH solid was mixed according to the mass ratio...

Embodiment 3

[0054] (1) Wash the pomelo peel of the biomass prefabricated body to remove surface impurities, and shred it to obtain a uniform block A with a diameter of 3 mm;

[0055] (2) Freeze-drying uniform block A at 0°C for 24 hours to obtain block B;

[0056] (3) Take 1.5g of block B, add solid superacid to block B according to the mass ratio of B: solid superacid of 1:1, then add 60ml of ethanol solution, and magnetically stir for 1h to form a mixed solution C;

[0057] (4) Transfer the mixed solution C to a homogeneous hydrothermal reaction kettle, seal it and put it into a homogeneous reactor, heat up to 160°C at a heating rate of 15°C / min for hydrothermal reaction for 24 hours, then cool naturally to room temperature to obtain water Thermal product D, wherein the lining of the reactor is polytetrafluoroethylene, and the filling ratio of the reactor is 60%;

[0058] (5) After the precursor D was washed and filtered, the precursor D:KOH solid was mixed uniformly at a mass ratio of...

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Abstract

The invention discloses a method for preparing a negative electrode material for a sodium-ion battery from KOH activated pomelo peel. The method comprises the following steps of cleaning a biomass prefabricated part, freezing and drying the biomass prefabricated part, and performing hydrothermal reaction after solid superacid and an ethanol solution are added to obtain a biomass precursor; filtering and drying the biomass precursor, uniformly mixing the biomass precursor and KOH solid according to a certain mass proportion, and performing carbonization in a tubular atmosphere furnace to obtain a carbonization product; and washing and filtering the carbonization product, and drying and grinding the carbonization product to obtain the negative electrode material having a three-dimensional porous communication structure for the biomass carbon sodium-ion battery. By such method, the original porous structure and honeycomb characteristic of biomass are inherited, relatively large specific area and relatively low internal impedance are achieved, a condition is provided for rapid transmission of sodium ions, the capacity of the material is expanded, and the electrochemical property of the material can be remarkably improved.

Description

technical field [0001] The invention belongs to the field of preparation of negative electrode materials for sodium ion batteries, and in particular relates to a method for preparing negative electrode materials for sodium ion batteries by activating pomelo peels with KOH. Background technique [0002] Lithium-ion batteries are widely used in the portable electronics market due to their high energy density, long cycle life, and no memory effect. However, as industries such as vehicles and large-scale power systems rely more heavily on lithium-ion batteries, global lithium resources will not be able to effectively meet the huge demand for power lithium-ion batteries, which will further push up the prices of lithium-related materials and increase the battery capacity. cost, which ultimately hinders the development of the new energy industry. Therefore, it is critical to develop other related energy storage technologies that are inexpensive alternatives to lithium-ion batterie...

Claims

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Application Information

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IPC IPC(8): H01M4/587H01M10/054C01B31/08C01B31/12
CPCC01P2002/82C01P2004/03C01P2006/12H01M4/587H01M10/054Y02E60/10
Inventor 黄剑锋李瑞梓何元元李文斌许占位曹丽云李嘉胤王彩薇
Owner SHAANXI UNIV OF SCI & TECH
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