Sodium ion battery negative electrode material

A technology for sodium ion batteries and negative electrode materials, applied in the field of materials, can solve the problems of unstable structure, low specific capacity and rate performance, and poor sodium storage performance of nanoparticles, and achieve improved ionic and electronic conductivity and excellent rate. performance, the effect of improving sodium storage performance

Inactive Publication Date: 2020-03-03
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the TiO used in the negative electrode of sodium ion battery in the prior art 2 Nanoparticles have poor sodium storage performance, unstable structure, low specific capacity and rate performance, thus providing a fluorine-doped TiO 2 Nanoparticle-based anode for sodium-ion batteries, and fluorine-doped TiO 2 How to make nanoparticles

Method used

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  • Sodium ion battery negative electrode material
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  • Sodium ion battery negative electrode material

Examples

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Embodiment 1

[0031] Example 1 is a comparative example, using a one-step solvothermal method, mixing and stirring a certain proportion of deionized water and an organic titanium source (butyl titanate), and synthesizing undoped TiO by solvothermal method 2 nanoparticles. Specific steps are as follows:

[0032] Step 1. Add 25ml of butyl titanate and 6ml of deionized water to the inner lining of the reaction kettle in sequence, and keep stirring evenly with a magnetic stirrer;

[0033] Step 2. Put the reaction kettle into a vacuum blast drying oven, set the reaction temperature of the heat-dissolving agent to 180°C and the time to 24h, and start the reaction;

[0034] Step 3, after the reaction finishes, the reaction system is cooled to room temperature with the furnace;

[0035] Step 4. Remove the supernatant in the inner lining of the reactor, wash and centrifuge the bottom product of the reactor with deionized water and ethanol for 6 times, the centrifugal speed is 8000-9000r / min, the c...

Embodiment 2

[0038] Example 2 is a comparative example, using a one-step solvothermal method, mixing and stirring a certain proportion of deionized water, organic titanium source (butyl titanate) and fluorine source (hydrofluoric acid), and synthesizing ultra-small fluorine through solvothermal method doped TiO 2 nanoparticles. Specific steps are as follows:

[0039] Step 1. Add 25ml of butyl titanate, 5ml of deionized water and 1ml of hydrofluoric acid with a mass percentage of 40% to the inner lining of the reaction kettle in sequence, and keep uniform stirring with a magnetic stirrer;

[0040] Step 2. Put the reaction kettle into a vacuum blast drying oven, set the reaction temperature of the heat-dissolving agent to 180°C and the time to 24h, and start the reaction;

[0041] Step 3, after the reaction finishes, the reaction system is cooled to room temperature with the furnace;

[0042] Step 4. Remove the supernatant in the inner lining of the reactor, wash and centrifuge the bottom...

Embodiment 3

[0045] The sodium ion battery negative electrode of the present invention adopts fluorine-doped TiO 2 Nanoparticles in which fluorine doped TiO 2 The preparation method of nanoparticles is as follows. Using a one-step solvothermal method, a certain proportion of deionized water, organic titanium source (butyl titanate) and fluorine source (hydrofluoric acid) are mixed and stirred evenly, and ultra-small fluorine is synthesized by solvothermal method. doped TiO 2 Nanoparticles, by adjusting the ratio between the organic titanium source and the fluorine source, a single-phase structure, good crystallinity, uniform size, and easy preparation of ultra-small fluorine-doped TiO 2 Nanoparticles, the specific steps are as follows:

[0046] Step 1. Add 25ml of butyl titanate, 3ml of deionized water and 3ml of hydrofluoric acid with a mass percentage of 40% to the inner lining of the reaction kettle in sequence, and keep uniform stirring with a magnetic stirrer;

[0047] Step 2. Put ...

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Abstract

The invention discloses a sodium ion battery negative electrode material. The battery negative electrode material adopts fluorine-doped TiO2 nanoparticles. The fluorine-doped TiO2 nanoparticles are prepared by adopting a one-step solvothermal method, specifically, an organic titanium source, a fluorine source and deionized water in a certain proportion are mixed and stirred uniformly, and the fluorine-doped TiO2 nanoparticles are synthesized by adopting the solvothermal method. By adjusting the volume ratio of the organic titanium source to the fluorine source to the deionized water to be 25:3: 3, the ultra-small fluorine-doped TiO2 nanoparticles which are of a single-phase structure, good in crystallinity, uniform in size and easy to prepare are obtained; the organic titanium source is butyl titanate, and the fluorine source is hydrofluoric acid with the mass percent of 40%. The prepared fluorine-doped TiO2 nanoparticles are used for the negative electrode of the sodium ion battery,and have the advantages of high first-week coulombic efficiency, high specific capacity, good rate capability, long cycle life and the like.

Description

technical field [0001] The invention belongs to the field of materials, in particular to a negative electrode material of a sodium ion battery. Background technique [0002] In the past few decades, lithium-ion batteries have been used in portable electronic devices, electric vehicles, and hybrid vehicles due to their advantages such as high energy density, long cycle life, and green and non-polluting. As the demand for lithium-ion batteries increases, the limited resources and price of lithium inhibit the further development of lithium-ion batteries. Na-ion batteries, as an alternative, have been extensively studied in recent years due to the abundance and low cost of sodium resources. However, the radius of sodium ions is relatively large, and it is difficult to find suitable materials to accommodate sodium ions efficiently. Graphite, as a common negative electrode for lithium-ion batteries, can only show extremely low capacity in sodium-ion batteries. Alloy type materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M10/054B82Y30/00
CPCH01M4/48H01M10/054B82Y30/00H01M2004/021H01M2004/027Y02E60/10
Inventor 夏晖倪明珠夏求应
Owner NANJING UNIV OF SCI & TECH
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