Tin phosphide/expanded graphite negative electrode composite material for sodium-ion battery and preparation method of tin phosphide/expanded graphite negative electrode composite material

A sodium-ion battery, expanded graphite technology, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of low energy density, low specific capacity of soft carbon negative electrodes, etc., to relieve volume expansion and good conductivity. , the effect of low energy consumption

Active Publication Date: 2020-04-10
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the current energy density of sodium-ion batteries is not high, and the specific capacity of soft carbon negative electrodes is low. Therefore, it is necessary to develop a high-capacity negative electrode material to increase the energy density of sodium-ion batteries.

Method used

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  • Tin phosphide/expanded graphite negative electrode composite material for sodium-ion battery and preparation method of tin phosphide/expanded graphite negative electrode composite material
  • Tin phosphide/expanded graphite negative electrode composite material for sodium-ion battery and preparation method of tin phosphide/expanded graphite negative electrode composite material
  • Tin phosphide/expanded graphite negative electrode composite material for sodium-ion battery and preparation method of tin phosphide/expanded graphite negative electrode composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] In this embodiment, a tin phosphide / expanded graphite composite material with a carbon content of 16.7% by weight made of expanded graphite and tin phosphide is taken as an example. The sodium ion battery tin phosphide / expanded graphite negative electrode provided in this embodiment is tested through specific experiments. The effect of carbon content in the composite material on the electrochemical performance of the material is verified as follows:

[0048] Weigh 0.375g surfactant CTAB, 4.5g NH 4 F, 0.1g Ti 2 (SO 4 ) 3 Dissolve in 400ml of deionized water, weigh 3g of tin tetrachloride and 10.8g of urea to dissolve in the above deionized water, heat it in an oil bath at 95°C, stir for 5h, filter and dry to obtain tin hydroxide. Weigh 6g of sodium hypophosphite and place it in the crucible upstream of the tube furnace, and place 0.4g of tin hydroxide in the crucible downstream. Under a nitrogen atmosphere, heat it to 350℃ at a heating rate of 5℃ / min and keep it for 1 hour. ...

Embodiment 2

[0053] In this embodiment, a tin phosphide / expanded graphite composite material with a carbon content of 10 wt% made of expanded graphite and tin phosphide is taken as an example, and the sodium ion battery phosphide tin / expanded graphite negative electrode composite material provided in this embodiment is tested through specific experiments. The effect of carbon content in the material on the electrochemical performance of the material is verified as follows:

[0054] In this example, compared with Example 1, the parameters of expanded graphite were adjusted from 0.1g to 0.055g, and other experimental conditions were the same as Example 1. Tin phosphide with a particle size of 100-200nm and a carbon content of 10wt% was prepared. Expanded graphite composite material. Next, the electrochemical performance of the composite material provided in this embodiment is analyzed.

[0055] The tin phosphide / expanded graphite composite material prepared in this embodiment is used to assemble...

Embodiment 3

[0057] In this embodiment, a tin phosphide / expanded graphite composite material with a carbon content of 30 wt% made of expanded graphite and tin phosphide is taken as an example. The sodium ion battery tin phosphide / expanded graphite negative electrode composite provided by this embodiment is tested through specific experiments. The effect of carbon content in the material on the electrochemical performance of the material is verified as follows:

[0058] In this example, compared with example 1, the parameters of expanded graphite are adjusted from 0.1g to 0.215g. The other experimental conditions are the same as that of example 1. A tin phosphide with a particle size of 100-250nm and a carbon content of 30wt% / expanded Graphite composite material.

[0059] The tin phosphide / expanded graphite composite material prepared in this embodiment is used to assemble a sodium ion battery. After 100 cycles of charging and discharging at a constant current of 500 mA / g at room temperature, th...

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Abstract

The embodiment of the invention provides a tin phosphide / expanded graphite negative electrode composite material of a sodium-ion battery and a preparation method of the tin phosphide / expanded graphitenegative electrode composite material. The material is formed by coating the surface of spherical tin phosphide with graphite flakes stripped from expanded graphite and integrally loading the spherical tin phosphide on the stripped graphite flakes; specifically, tin tetrachloride is dissolved in deionized water containing a surfactant CTAB, urea, ammonium fluoride and titanium sulfate, the temperature is raised to a preset temperature, and a tin hydroxide precursor is prepared based on hydroxyl ions OH<-> generated after CTAB, NH<4><+>, F<->, titanium sulfate and urea are decomposed; sodium hypophosphite is taken as a phosphorus source, gas-phase phosphorization is performed on the tin hydroxide precursor to generate spherical tin phosphide; and ethanol, tin phosphide and expanded graphite prepared by chemical oxidation are added into a ball milling tank for wet ball milling to obtain the tin phosphide / expanded graphite negative electrode composite material of the sodium-ion battery,so that the tin phosphide / expanded graphite negative electrode composite material can be used for relieving volume expansion in a charging and discharging process and reducing capacity loss in a circulating process.

Description

Technical field [0001] The invention relates to the field of sodium ion batteries, in particular to a sodium ion battery tin phosphide / expanded graphite negative electrode composite material and a preparation method thereof. Background technique [0002] With the popularization of digital products and the development of electric vehicles, the application of lithium-ion batteries has become more and more extensive, but the limited lithium resources and high mining costs hinder the development of lithium-ion batteries. Sodium is evenly distributed in nature. And the reserves are abundant, accounting for about 2.64% of the earth's crust reserves, of which a considerable part is distributed in the ocean, which makes the exploitation and utilization of sodium resources very low cost and provides favorable conditions for the development of sodium ion batteries. [0003] However, the energy density of current sodium ion batteries is not high, and the specific capacity of soft carbon anode...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/054
CPCH01M4/366H01M4/5805H01M4/583H01M10/054H01M2004/027Y02E60/10
Inventor 潘俊安胡佳卿潘勇雷维新罗振亚廖盎
Owner XIANGTAN UNIV
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