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Cobalt phosphate biomass carbon composite material and preparation method and application thereof

A composite material, biomass carbon technology, applied in electrochemical generators, electrical components, battery electrodes, etc., can solve the problems of specific capacity attenuation, affecting the application of biomass carbon materials, etc., to improve cycle life, easy to implement, heavy good effect

Inactive Publication Date: 2019-04-09
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the low specific capacity (less than 300mAh / g) of biomass carbon materials affects the application of biomass carbon materials as electrode materials.
Cobalt phosphide electrode material has a high theoretical specific capacity (greater than 500mAh / g) and is an ideal negative electrode material for sodium-ion batteries, but its severe volume change during charge and discharge will lead to a rapid decline in specific capacity

Method used

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  • Cobalt phosphate biomass carbon composite material and preparation method and application thereof
  • Cobalt phosphate biomass carbon composite material and preparation method and application thereof
  • Cobalt phosphate biomass carbon composite material and preparation method and application thereof

Examples

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Embodiment 1

[0028] Preparation and application of cobalt phosphide / biomass carbon composite material of embodiment 1

[0029] (1) Biomass carbon film preparation: freshly picked Magnolia magnificata leaves were washed 2-3 times with a mixed solution of acetone and deionized water at a ratio of 1:1, and dried in an oven at 60°C for 2 hours. Place the dried Magnolia glabrata leaves between graphite sheets at a heating rate of 3°C / min, and raise the temperature to 800°C under N 2 After being kept in the atmosphere for 2 hours, it was naturally cooled to room temperature, then placed in 3mol / L KOH aqueous solution for 2 hours, and then placed in 1mol / L HCl aqueous solution for 10 hours to obtain a biomass carbon film.

[0030] (2) Preparation of electrolyte: sodium hypophosphite and sodium sulfate are mixed and dissolved in cobalt sulfate heptahydrate solution, the pH value of the solution is adjusted with sulfuric acid, and the pH value is guaranteed to be 2.5 to obtain electrolyte; the elec...

Embodiment 2

[0036] Preparation and application of embodiment 2 cobalt phosphide / biomass carbon composite material

[0037] (1) Wash the freshly picked leaves of Magnolia magnolia 2-3 times with a mixed solution of acetone and water at a ratio of 1:1. Dry in an oven at 60°C for 2 hours. Place the dried blades in a tube furnace, feed nitrogen protective gas with an air intake of 0.2L / min, and heat up to 800°C at a rate of 2°C / min, keep it warm for 2 hours, and then cool it down to room temperature naturally. Then placed in 2mol / L KOH aqueous solution for 2 hours, and then placed in 2mol / L HCl aqueous solution for 6 hours to obtain biomass carbon film.

[0038] (2) Preparation of electrolyte: sodium hypophosphite and sodium sulfate are mixed and dissolved in cobalt sulfate heptahydrate solution, the pH value of the solution is adjusted with sulfuric acid, and the pH value is guaranteed to be 2.5 to obtain electrolyte; the electrolyte contains 0.2mol The sodium sulfate of / L, the sodium hyp...

Embodiment 3

[0042] Preparation and application of embodiment 3 cobalt phosphide / biomass carbon composite material

[0043] (1) Wash freshly picked leaves of Magnolia magnolia with a mixed solution of acetone and water at a ratio of 1:1 for 2-3 times, and dry them in an oven at 60° C. for 2 hours. Place the dried blades in a tube furnace, feed nitrogen protective gas at an air flow rate of 0.2 L / min, and heat up to 800°C at a rate of 2°C / min, keep it warm for 2 hours, then cool naturally to room temperature, and then Place in 2mol / L KOH aqueous solution for 2 hours, then place in 1mol / L HCl aqueous solution for 8 hours to obtain biomass carbon film.

[0044] (2) Preparation of electrolyte: mix sodium hypophosphite and sodium sulfate and dissolve in cobalt sulfate heptahydrate solution, adjust the pH value of the solution with sulfuric acid, and ensure that the pH value is 3 to obtain electrolyte; the electrolyte contains 0.4mol The sodium sulfate of / L, the sodium hypophosphite of 0.2mol / ...

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Abstract

The invention discloses a preparation method of a cobalt phosphate biomass carbon composite material. The invention also discloses the cobalt phosphate biomass carbon composite material and application thereof. Cobalt phosphate and biomass carbon film are combined by electrochemical deposition to obtain a cobalt phosphate / biomass carbon integrated electrode without a binding agent. The method is simple and is convenient to operate, and the material preparation cost is low. The cobalt phosphate and the biomass carbon material are initially combined and are applied to a sodium ion battery negative electrode material, and the composite material electrode is excellent in sodium storage performance and stable in structure. The prepared cobalt phosphate / biomass carbon composite material can be directly used as a negative electrode material of a sodium ion battery, the binding agent and active carbon are not needed to be added, and the cycle lifetime of the sodium ion battery can be remarkably prolonged.

Description

technical field [0001] The invention relates to a cobalt phosphide biomass carbon composite material and its preparation method and application. The invention also relates to the application of the composite material as an electrode material of a sodium ion battery, belonging to the field of composite materials and electrode materials. Background technique [0002] With the development and utilization of lithium-ion batteries, the reserves of lithium in the earth's crust are decreasing year by year. According to data, lithium resources in the earth's crust are only 0.002%, which belongs to a rare metal in nature, and the distribution range is uneven. This greatly restricts the development of power equipment with high safety factor and low price, batteries with long cycle life and renewable energy. It is especially important. Compared with lithium resources, sodium reserves are more abundant in the world, accounting for about 2.64%, and it is more widely distributed in the e...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/054
CPCH01M4/362H01M4/5805H01M4/583H01M10/054Y02E60/10
Inventor 李雪莹吴辉陈立庄郭旻钦郭钱
Owner JIANGSU UNIV OF SCI & TECH
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