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A kind of negative electrode active material of sodium ion battery, negative electrode, battery and preparation method

A technology for negative active materials and sodium-ion batteries, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor rate performance and cycle performance of titanium-based materials, achieve good cycle stability, good rate performance, and good electrical conductivity

Active Publication Date: 2019-11-05
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the above defects or improvement needs of the prior art, the present invention provides a negative electrode active material, a negative electrode, a battery and a preparation method for a sodium ion battery. Sodium ion battery negative electrode material, and provides the preparation method of the negative electrode material, thereby solving the technical problem of poor rate performance and cycle performance of current titanium-based materials

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  • A kind of negative electrode active material of sodium ion battery, negative electrode, battery and preparation method
  • A kind of negative electrode active material of sodium ion battery, negative electrode, battery and preparation method
  • A kind of negative electrode active material of sodium ion battery, negative electrode, battery and preparation method

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Embodiment 1

[0092] In this embodiment, the precursors of potassium source and titanium source are used as raw materials, and the negative electrode active material is prepared by a high-temperature carbothermal reduction method. The specific process is as follows:

[0093] First, KOH and anatase TiO 2 As a precursor, the two are stoichiometrically mixed in a mixed solution of ethylene glycol and deionized water,

[0094] Then, the hydrothermal reaction gives K 2 Ti 6 o 13 Nanowires, the hydrothermally obtained product and glucose are mixed uniformly in absolute ethanol, wherein the carbon content accounts for K 2 Ti 6 o 13 The ratio to the total mass of carbon is 30%,

[0095] After drying, the resulting mixture was 2 Carbon-coated K x TiO 2 For nanorods, the reaction temperature of the high-temperature carbothermal reduction method is 800° C., and the holding time is 360 minutes.

[0096] XRD test shows that the product is a single K x TiO 2 (0x TiO 2 (0<x<1) The nanorod su...

Embodiment 2

[0106] In this embodiment, the precursors of the potassium source and the titanium source are used as raw materials, and the negative electrode active material is prepared by chemical vapor deposition. The specific process is as follows:

[0107] First, KOH and anatase TiO 2 As the precursor, the two are mixed evenly in the mixed solution of ethylene glycol and deionized water according to the stoichiometric ratio. In practice, the selected medium is selected from water, ethanol, acetone, glycerin, isopropanol, ethylene glycol, n-butyl Alcohol, hydrazine hydrate, tetrahydrofuran, dimethyl sulfoxide, dimethylformamide, cyclohexane, n-hexane, octadecene, oleic acid, oleylamine or their mixture, and then hydrothermal reaction to obtain K 2 Ti 6 o 13 Nanowires,

[0108] Next, the hydrothermally obtained product is placed in a high-temperature reactor,

[0109] Finally, the organic carbon source toluene was brought into the high-temperature reactor by chemical vapor depositio...

Embodiment 3

[0113] In this embodiment, the precursors of the potassium source and the titanium source are used as raw materials, and the negative electrode active material is prepared by a solid-phase ball milling-assisted high-temperature calcination method. The specific process is as follows:

[0114] First, KOH and anatase TiO 2 As the precursor, glucose as the carbon source, the three are mixed uniformly by ball milling according to the stoichiometric ratio, and the carbon content accounts for 10% of the total mass of the mixture.

[0115] Then, the mixture was placed in a high-temperature reactor under N 2 Carry out high-temperature calcination under atmosphere protection, the holding temperature is 600-1000°C, and the holding time is 240-600min.

[0116] XRD test shows that the product is a single K x TiO 2 (0<x<1), through the observation of the scanning electron microscope and the transmission electron microscope, it is found that the thickness of the semi-graphitized carbon l...

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Abstract

The invention discloses a cathode active material for a sodium-ion battery, a cathode, a battery and a preparation method and belongs to the field of the sodium-ion battery. The cathode active material is a K-Ti-O ternary compound. The K-Ti-O ternary compound has a surface carbon coating layer or / and oxygen vacancy. According to the invention, a single-step calcining method is adopted for synthesizing the K-Ti-O ternary compound and meanwhile introducing a carbon conductive layer into the surface, or the single-step calcining method is adopted for synthesizing the K-Ti-O ternary compound and meanwhile introducing an oxygen vacancy into the surface or lattice, or the single-step calcining method is adopted for synthesizing the K-Ti-O ternary compound and meanwhile introducing the oxygen vacancy into the surface or lattice and introducing the carbon conductive layer into the surface. The cathode active material disclosed by the invention has high magnification and stable cycle performance. The preparation method disclosed by the invention is simple in process, low in cost and suitable for large-scale production.

Description

technical field [0001] The invention belongs to the field of sodium ion batteries, and more specifically relates to a negative electrode active material for a sodium ion battery, a negative electrode, a sodium ion battery and a preparation method thereof. Background technique [0002] As a representative of electrochemical energy storage technology, lithium-ion batteries have been widely used in various portable electronic devices and electric vehicles. However, lithium resources on the earth are very limited. Therefore, it is necessary to develop a new type of energy storage device to Replace lithium-ion batteries. [0003] Sodium is very abundant in the earth's crust, accounting for about 2.74% of the earth's crust, and is widely distributed, and the chemical properties of sodium and lithium are similar to a certain extent. Therefore, sodium-ion batteries are considered to be a new low-cost energy storage technology that is expected to replace lithium-ion batteries. Howe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/131H01M4/1391H01M4/36H01M10/054
CPCH01M4/131H01M4/1391H01M4/362H01M10/054Y02E60/10
Inventor 李会巧章庆贺俊翟天佑
Owner HUAZHONG UNIV OF SCI & TECH
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