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

A carbon-coated tin-based and negative electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as excessive volume effect and unsatisfactory cycle stability, achieve simple process, improve cycle performance, reduce The effect of manufacturing cost

Active Publication Date: 2019-05-17
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 and preparation method and application of carbon-coated tin-based negative electrode material
  • Carbon-coated tin-based negative electrode material, sodium ion battery and preparation method and application of carbon-coated tin-based negative electrode material
  • Carbon-coated tin-based negative electrode material, sodium ion battery and preparation method and application of carbon-coated tin-based negative electrode material

Examples

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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 a 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 in a 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 and preparation method and application of the carbon-coated tin-based negative electrode material. The carbon-coated tin-based negative electrode material comprises sodium titanium stannate and carbon, wherein the chemical formula of the sodium titanium stannate is NaTiSnO4, carbon is coated on a surface of the sodium titanium stannate, the carbon content accounts for 1-10%, and the percent is mass percent 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 of S1, mixing a sodium source, a titanium source, a tin source, a carbon source and water to obtainpaste; S2, spraying and drying the paste to obtain a precursor; and S3, sintering the precursor to obtain the carbon-coated tin-based negative electrode material. The preparation method is simple inprocess and low in cost, and preparation on a large scale can be achieved. The carbon-coated tin-based negative electrode material is zero in strain during the sodium ion de-intercalation / intercalation process and is stable in structure, high in charge-discharge specific capacity and good in cycle property, can be used for preparing a sodium ion battery and has great advantages in application of energy storage.

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 Applications(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