Sodium ion battery cathode material based on MXene and pseudocapacitance transition metal oxide nano composite structure, and synthetic method

A sodium-ion battery and transition metal technology, applied in battery electrodes, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problems of poor conductivity and low electrochemical active surface area, and achieve easy scale production, The effect of simple process technology

Active Publication Date: 2019-07-26
DALIAN UNIV OF TECH
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Problems solved by technology

[0005] Aiming at the disadvantages of poor electrical conductivity and low electrochemically active surface area of ​​pseudocapacitive transition metal oxides, the present invention provides a sodium ion battery negative electrode material based on a nanocomposite structure of MXene and pseudocapacitive transition metal oxides and its synthesis method. The obtained electrode material is composed of carbon-coated MXene two-dimensional nanosheets uniformly loaded with pseudocapacitive transition metal oxide nanoparticles on the surface, and has a two-dimensional nanostructure

Method used

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  • Sodium ion battery cathode material based on MXene and pseudocapacitance transition metal oxide nano composite structure, and synthetic method
  • Sodium ion battery cathode material based on MXene and pseudocapacitance transition metal oxide nano composite structure, and synthetic method
  • Sodium ion battery cathode material based on MXene and pseudocapacitance transition metal oxide nano composite structure, and synthetic method

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Embodiment 1

[0032] Embodiment 1 The preparation method of the nanocomposite electrode material based on MXene and molybdenum oxide nanoparticles

[0033] 1) Dissolve 40mg MXene, 40mg dopamine, 150mg ammonium molybdate tetrahydrate in 30mL water, add 60mL absolute ethanol and 0.4mL ammonia water to prepare a suspension. The reaction temperature was 25°C. After stirring for 4 hours, the mixture was separated and washed to obtain a black powder.

[0034] 2) The composite structure obtained in step 1) is calcined in argon, the calcining temperature is 550° C., and the calcining time is 3 h. The obtained product is a carbon-coated MXene two-dimensional nanosheet with an average size of about 250-400 nm and uniformly loaded molybdenum oxide nanoparticles on the surface, wherein the size of the molybdenum oxide nanoparticles is about several nanometers.

Embodiment 2

[0035] Embodiment 2 Preparation method of nanocomposite electrode material based on MXene and manganese oxide nanoparticles

[0036] 1) Dissolve 50mg of MXene, 70mg of dopamine, and 250mg of manganese sulfate tetrahydrate in 40mL of water, add 70mL of absolute ethanol and 0.6mL of ammonia water to prepare a suspension. The reaction temperature was 40°C. After stirring for 5 hours, the mixture was separated and washed to obtain a black powder.

[0037] 2) Calcining the composite structure obtained in step 1) in nitrogen, the calcination temperature is 600° C., and the calcination time is 3 h. The obtained product is a carbon-coated MXene two-dimensional nanosheet with an average size of about 200-400 nm and uniformly loaded manganese oxide nanoparticles on the surface, wherein the size of the manganese oxide nanoparticles is about several nanometers.

Embodiment 3

[0038] Example 3 Preparation method of nanocomposite electrode material based on MXene and tungsten molybdenum oxide nanoparticles

[0039] 1) Dissolve 20mg MXene, 30mg dopamine, 90mg ammonium tungstate tetrahydrate and 50mg ammonium molybdate tetrahydrate in 20mL water, add 30mL absolute ethanol and 0.3mL ammonia water to prepare a suspension. The reaction temperature was 20°C. After stirring for 5 hours, the mixture was separated and washed to obtain a black powder.

[0040] 2) Calcining the composite structure obtained in step 1) in argon, the calcination temperature is 900° C., and the calcination time is 3 h. The obtained product is a carbon-coated MXene two-dimensional nanosheet with an average size of about 300-600nm and uniformly loaded tungsten-molybdenum oxide nanoparticles on the surface, wherein the size of the tungsten-molybdenum oxide nanoparticles is about several nanometers.

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Abstract

The invention discloses a sodium ion battery cathode material based on an MXene and pseudocapacitance transition metal oxide nano composite structure, and a synthetic method, and belongs to the technical field of new materials. The sodium ion battery cathode material consists of a carbon coated MXene two-dimensional nano sheet uniformly loaded with pseudocapacitance transition metal oxide nano particles on the surface, and has a two-dimensional nano structure. The synthetic method comprises the steps of dissolving MXene, a carbon source precursor and metal salt in water, adding absolute ethylalcohol and ammonia water to prepare a suspension, performing stirring, reaction, separation and washing to obtain a mixture, and performing calcination treatment in a high-temperature furnace under inert gas shield to obtain the carbon coated MXene two-dimensional nano sheet cathode material uniformly loaded with the pseudocapacitance transition metal oxide nano particles on the surface. The structure and the component of the cathode material are adjustable. The synthetic method is simple in technology, low in energy consumption, easy to control, green and environment-friendly, has the universality, and can be used for large-scale industrial popularization and application; and the obtained cathode material represents high specific capacity, excellent cycling stability and excellent rate capability in a sodium ion battery.

Description

technical field [0001] The invention belongs to the technical field of new materials, and relates to a sodium ion battery negative electrode material based on a nanocomposite structure of MXene and a pseudocapacitive transition metal oxide and a synthesis method thereof. Background technique [0002] Lithium-ion batteries have high energy density, environmental friendliness and long life, and are currently one of the most widely used energy storage and power battery systems. However, problems such as uneven distribution of lithium resources, limited reserves, and high price greatly limit its large-scale application. The content of sodium in the earth's crust is more than 400 times that of lithium, and the mining and production costs of cathode materials for sodium-ion batteries are only 1 / 100 of lithium-ion batteries. Compared with lithium-ion batteries, it has very obvious resource and cost advantages, and it is one of the hot research areas of cheap energy storage battery...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/58H01M4/587H01M4/62H01M10/054B82Y30/00
CPCH01M4/366H01M4/485H01M4/505H01M4/587H01M4/58H01M4/624H01M4/625H01M10/054B82Y30/00Y02E60/10
Inventor 王治宇董文芊邱介山
Owner DALIAN UNIV OF TECH
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