Preparation methods for high capacity biomass hard carbon anode material of sodium ion battery

A technology for sodium ion batteries and negative electrode materials, which is applied in battery electrodes, secondary batteries, electrochemical generators, etc., can solve problems such as being unsuitable for large-scale production, difficult to guarantee stability, and long process processing, and achieve a suitable scale Chemical production, good morphology and pore structure, mild and controllable preparation conditions

Inactive Publication Date: 2019-06-21
NINGBO SHANSHAN NEW MATERIAL TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with non-enzymatic starch, the first reversible capacity of enzymatic porous hard carbon 0.1C lithium storage increased from 305mAh / g to 454mAh / g, although the first Coulombic efficiency increased from 42.8% to 66.6%, but the first effect level is still relatively low. Low, and the process is long, the stability is difficult to guarantee, and it is not suitable for large-scale production

Method used

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  • Preparation methods for high capacity biomass hard carbon anode material of sodium ion battery

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Experimental program
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Effect test

Embodiment 1

[0032] 1. Take 1000g of rice starch crushed and sieved to a volume average particle size of 10 μm;

[0033] 2. Feed rice starch and 150g of ammonium chloride into a stirring mixer and mix for 10 minutes at a speed of 1000r / min to obtain a mixture; put the obtained mixture in a blast drying oven and dehydrate and solidify at 150°C for 6 hours to obtain The cured rice starch precursor;

[0034] 3. Add deionized water and 100 g of phosphoric acid to the cured rice starch precursor, and prepare the solidified material into a slurry with a solid content of 50% in a high-speed mixing mixer, and then place it in a blast drying oven at 150 ℃ drying to completely remove water, obtain the modified rice starch precursor after cooling;

[0035] 4. Put the modified rice starch precursor into the pit furnace and raise the temperature at 2°C / min to 600°C under the protection of nitrogen for pre-carbonization for 1 hour. After cooling down to room temperature and discharging, use jet milling...

Embodiment 2

[0038] 1. Take 1000g of rice starch crushed and sieved to a volume average particle size of 10 μm;

[0039] 2. Feed rice starch and 200g of ammonium chloride into a stirring mixer and mix at 1000r / min for 10 minutes to obtain a mixture; react the obtained mixture in a blast drying oven at 150°C for 6 hours to obtain solidified Rice starch precursor;

[0040] 3. Add deionized water and 100 g of phosphoric acid to the cured rice starch precursor, and prepare the solidified material into a slurry with a solid content of 50% in a high-speed mixing mixer, and then place it in a blast drying oven at 150 ℃ drying to completely remove water, obtain the modified rice starch precursor after cooling;

[0041] 4. Put the modified rice starch precursor into the pit furnace and raise the temperature at 2°C / min to 600°C under the protection of nitrogen for pre-carbonization for 1 hour. After cooling down to room temperature and discharging, use jet milling to adjust the particle size to 9 μ...

Embodiment 3

[0044] 1. Take 1000g of rice starch crushed and sieved to a volume average particle size of 10 μm;

[0045]2. Feed rice starch and 150g of ammonium chloride into a stirring mixer and mix at 1000r / min for 10 minutes to obtain a mixture; react the obtained mixture in a blast drying oven at 150°C for 6 hours to obtain cured rice starch precursor;

[0046] 3. Add deionized water and 50 g of phosphoric acid to the cured rice starch precursor, and prepare the solidified product into a slurry with a solid content of 50% in a high-speed mixer, and then place it in a blast drying oven at 150 ℃ drying to completely remove water, obtain the modified rice starch precursor after cooling;

[0047] 4. Put the modified rice starch precursor into the pit furnace and raise the temperature at 2°C / min to 600°C under the protection of nitrogen for pre-carbonization for 1 hour. After cooling down to room temperature and discharging, use jet milling to adjust the particle size to 9 μm to obtain Pr...

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Abstract

The invention relates to the technical field of a secondary battery, specifically preparation methods for a high capacity biomass hard carbon anode material of a sodium ion battery. A method comprisesthe following processing steps of crushing and screening a biomass raw material to obtain precursor powder; adding a dehydrating agent, carrying out uniform mixing to obtain a mixture, and carrying out dehydration curing reaction; mixing a curved biomass precursor with a modifier, carrying out mixing by taking water as a dispersant, and carrying out drying processing to obtain a modified biomassprecursor; and carrying out pre-carbonization processing and carbonization processing in sequence. Compared with the prior art, the method has the advantages that starch is taken as the raw material,through curving processing, the problem that the starch is melted and gelatinized due to a high temperature is effectively avoided, and doping and modification processing is carried out on cured starch granules, so a surface chemical environment and an internal structure of hard carbon are changed, and electrochemical performance of the biomass hard carbon anode material is effectively improved. Through curing reaction processing, hard carbon yield is also remarkably improved.

Description

technical field [0001] The invention relates to the technical field of secondary batteries, in particular to a method for preparing a high-capacity biomass hard carbon negative electrode material for sodium ion batteries. Background technique [0002] With the development of society and the continuous improvement of global energy demand, resource scarcity and environmental problems caused by fossil energy consumption have become increasingly prominent. Obviously, from the perspective of sustainable social development, it is particularly necessary to vigorously develop and utilize renewable energy and gradually get rid of human dependence on fossil energy. However, the utilization of renewable energy requires the development of supporting energy storage facilities to ensure the continuity and stability of electricity consumption. The current secondary battery technology is currently the most likely technical solution for large-scale energy storage devices due to its advantag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M10/054
CPCY02E60/10
Inventor 葛传长沈龙吴志红李虹范拯华
Owner NINGBO SHANSHAN NEW MATERIAL TECH
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