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Carbon-coated tin-based negative electrode material, sodium-ion battery, preparation method and application thereof

A carbon-coated tin-based, negative electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of excessive volume effect, unsatisfactory cycle stability, etc., achieve simple process, improve cycle performance, conductivity rate-enhancing effect

Active Publication Date: 2021-08-13
SHANGHAI ZIJIAN CHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the defects of excessive volume effect and unsatisfactory cycle stability of tin-based negative electrode materials in sodium ion batteries in the prior art, the present invention provides a carbon-coated tin-based negative electrode material, a sodium ion battery and a preparation method thereof

Method used

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  • Carbon-coated tin-based negative electrode material, sodium-ion battery, preparation method and application thereof
  • Carbon-coated tin-based negative electrode material, sodium-ion battery, preparation method and application thereof
  • Carbon-coated tin-based negative electrode material, sodium-ion battery, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Weigh 2.65g of sodium carbonate, 4g of titanium dioxide (with a particle size of 300nm), 7.53g of tin dioxide (with a particle size of 400nm), and 2.1g of starch into 60mL of deionized water, mix well, and place in a ball mill jar for ball milling for 3 hours. The speed is 500rmp to obtain the slurry; the slurry is spray-dried and granulated to obtain the precursor, the spray drying inlet temperature is 220°C, and the outlet temperature is 105°C; the precursor is sintered at 800°C under nitrogen atmosphere for 12 hours, and naturally cooled to room temperature, the carbon-coated tin-based negative electrode material NaTiSnO 4 / C, wherein the carbon content is 3%.

Embodiment 2

[0047] Weigh 2.65g of sodium carbonate, 4g of titanium dioxide (with a particle size of 200nm), 7.53g of tin dioxide (with a particle size of 200nm), and 0.7g of starch into 70mL of deionized water, mix evenly, and place in a ball mill jar for ball milling for 1 hour. The speed is 200rmp to obtain the slurry; the slurry is spray-dried and granulated to obtain the precursor, the spray drying inlet temperature is 200°C, and the outlet temperature is 95°C; the precursor is sintered at 600°C under nitrogen atmosphere for 5 hours, and naturally cooled to room temperature, the carbon-coated tin-based negative electrode material NaTiSnO 4 / C, wherein the carbon content is 1%.

Embodiment 3

[0049] Weigh 2.65g of sodium carbonate, 4g of titanium dioxide (with a particle size of 500nm), 7.53g of tin dioxide (with a particle size of 800nm), and 3.5g of starch into 60mL of deionized water, mix well, and place in a ball mill jar for ball milling for 5 hours. The speed is 800rmp to obtain the slurry; the slurry is spray-dried and granulated to obtain the precursor, the spray drying inlet temperature is 260°C, and the outlet temperature is 120°C; the precursor is sintered at 900°C under a nitrogen atmosphere for 15 hours and cooled naturally to room temperature, the carbon-coated tin-based negative electrode material NaTiSnO 4 / C, wherein the carbon content is 5%.

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Abstract

The invention discloses a carbon-coated tin-based negative electrode material, a sodium ion battery, a preparation method and an application thereof. The carbon-coated tin-based negative electrode material includes sodium titanium stannate and carbon, and the chemical formula of sodium titanium stannate is NaTiSnO 4 , carbon is coated on the surface of the sodium titanium stannate, and the content of carbon is 1% to 10%, and the above percentage is the mass percentage of carbon relative to the carbon-coated tin-based negative electrode material. The preparation method of the carbon-coated tin-based negative electrode material comprises the following steps: S1: mixing a sodium source, a titanium source, a tin source, a carbon source, and water to obtain a slurry; S2: spray-drying the slurry to obtain a precursor; S3 : The precursor is sintered to obtain the carbon-coated tin-based negative electrode material. The preparation method has simple process, can be prepared in a large scale, and has low cost. The carbon-coated tin-based negative electrode material has zero strain during the sodium ion detachment / intercalation process, stable structure, high charge-discharge specific capacity, and good cycle performance. It can be applied to the preparation of sodium ion batteries, and has great advantages as an energy storage application.

Description

technical field [0001] The invention relates to a carbon-coated tin-based negative electrode material, a sodium ion battery, a preparation method and application thereof. Background technique [0002] Large-scale energy storage requires an energy storage system that is cheap, safe, green, and environmentally friendly. Among the existing large-scale energy storage methods, the electrochemical energy storage system has attracted widespread attention due to its high efficiency and flexibility. It is also a research hotspot at home and abroad. Sodium element The earth reserves are very rich, widely distributed, and simple to extract. Sodium-ion batteries have the advantage of low cost and are expected to be used as large-scale energy storage applications. [0003] Sodium-ion batteries have obvious advantages as a large-scale energy storage application, but there are also challenges, especially the difficulty in finding electrode materials with excellent electrochemical propertie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/485H01M4/62H01M10/054
CPCY02E60/10
Inventor 王红车海英马紫峰
Owner SHANGHAI ZIJIAN CHEM TECH CO LTD