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Sodium ion negative electrode material, preparation method and sodium ion battery

A technology of negative electrode material and sodium ion, applied in the field of negative electrode active material and preparation of sodium ion battery, can solve the problems of low material utilization rate, low electrochemical performance, battery capacity attenuation, etc. Improved, improved cycle stability effect

Inactive Publication Date: 2022-04-19
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current energy density of sodium-ion batteries is far less than the theoretical value, and the biggest challenge is the high specific capacity electrode materials and the slow transfer kinetics of sodium ions in the electrode active materials, resulting in low electrochemical performance and excessive low material utilization
More importantly, due to the huge volume expansion and contraction during the sodium storage and desodination process of the electrode active material during the cycle, the electrode material ruptures and falls off, causing a rapid decline in battery capacity.

Method used

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  • Sodium ion negative electrode material, preparation method and sodium ion battery
  • Sodium ion negative electrode material, preparation method and sodium ion battery
  • Sodium ion negative electrode material, preparation method and sodium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0033] With 1.0g urea, 5mmol ferric nitrate nonahydrate (Fe(NO 3 ) 3 9H 2 O), 4 mmol triphenylphosphine and 0.2 g PMMA (polymethyl methacrylate) were added in batches to 10 mL of DMF (N-N-dimethylformamide), stirred and dissolved, and stirred thoroughly for 24 hours to form a precursor solution A , and then add 0.9g PVP (polyvinylpyrrolidone) into the precursor solution A and stir evenly, and continue to stir for 24 hours to obtain a transparent solution B;

[0034] Inject the transparent solution B into the needle tube, use a 18G single-core needle, set the experimental temperature range to 40°C, and the experimental humidity range to 30%; the positive voltage is 17kV, the negative voltage is -3kV, and the injection speed is 0.06mm / min. The target material is obtained by spinning, and the target material is removed from the collector, placed in a 50°C oven to dry overnight, and then heat-treated. First, the sample is placed in a tube furnace and heated in air at 300°C for 1...

Embodiment 2

[0039] With 1.5g urea, 4mmol copper nitrate trihydrate (Cu(NO 3 ) 2 ·3H 2O) and 0.3g PMMA (polymethyl methacrylate) were added in batches to 10mL of DMF (N-N-dimethylformamide), stirred and dissolved, and stirred thoroughly for 24h to form precursor solution A, and then 0.8g PVP (polyvinylpyrrolidone) was added to the precursor solution A and stirred evenly, and the transparent spinning solution B was obtained after continuous stirring for 24 hours;

[0040] Add 4mmol triphenylphosphine and 0.5g PMMA (polymethyl methacrylate) into 10mL DMF (dimethylformamide) in batches, stir and dissolve for 24h, and form a transparent precursor solution C after fully dissolving, and then Add 0.8g PVP (polyvinylpyrrolidone) into the precursor solution C and stir for 24 hours until a transparent spinning solution D is obtained;

[0041] Inject solution B and solution D into two needle tubes respectively for synchronous electrospinning, using a 18G needle with the same core, the inner core i...

Embodiment 3

[0043] Add 2.0g of urea, 6mmol of antimony trichloride, 4mmol of triphenylphosphine and 1.5g of PMMA (polymethyl methacrylate) into 10mL of DMF (N-N-dimethylformamide) in batches, and stir to dissolve. After fully stirring for 24 hours, precursor solution A was formed, then 1.5g PAN (polyacrylonitrile) was added to precursor solution A and stirred evenly, and transparent solution B was obtained after continuous stirring for 24 hours;

[0044] Inject the transparent solution B into the needle tube, use a 18G single-core needle, set the experimental temperature range to 50°C, and the experimental humidity range to 40%; the positive voltage is 30kV, the negative voltage is -1kV, and the injection speed is 0.06mm / min. The target material is obtained by spinning, and the target material is removed from the collector, placed in a 50°C oven to dry overnight, and then heat-treated. First, the sample is placed in a tube furnace and heated in air at 200°C for 1 hour. Shape the fiber sha...

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Abstract

The invention discloses a sodium ion negative electrode material, a preparation method and a sodium ion battery. The sodium ion negative electrode material is a fiber material composed of a nitrogen-doped carbon layer and a phosphide layer; a porous structure is arranged inside or on the surface of the fiber; and the carbon layer is coated outside the phosphide layer or embedded inside the phosphide layer. A fiber structure is prepared through electrostatic spinning, the low melting point of polymethyl methacrylate is utilized in the preparation process, in the spinning heat treatment process, polymethyl methacrylate is gasified to generate pore structures on the fiber surface and in the fiber, and then the inner layer and the outer layer of the material can be better coated with a carbon layer through heat treatment carbonization; the conductivity of the composite material is improved. In the prepared sodium ion battery, the diffusivity of sodium ions in the sodium ion battery is improved by 3-5 times, the cycling stability of the battery is improved by one time, the specific capacity is improved by 50-100%, and the rate capability is improved by 100-300%.

Description

technical field [0001] The invention belongs to the negative electrode active material of sodium ion battery and its preparation, in particular to a porous nitrogen-doped composite fiber sodium ion negative electrode material and a sodium ion secondary battery containing the negative electrode material. Background technique [0002] Na-ion batteries have attracted extensive attention in recent years because of their excellent low manufacturing cost, high safety and theoretical capacity. However, the current energy density of sodium-ion batteries is far less than the theoretical value, and the biggest challenge is the high specific capacity electrode materials and the slow transfer kinetics of sodium ions in the electrode active materials, resulting in low electrochemical performance and excessive Low material utilization. More importantly, due to the huge volume expansion and contraction during the sodium storage and desodination process of the electrode active material dur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36D01F1/10D01F6/52H01M4/58H01M4/62H01M10/054
CPCH01M4/5805H01M4/625H01M4/366H01M10/054D01F6/52D01F1/10H01M2004/027H01M2004/021
Inventor 马鑫荣谌潇靖申欣葛庆磊范丽桢朱添宇丁旭丽
Owner JIANGSU UNIV OF SCI & TECH
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