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Lithium vanadate anode material, anode, battery and anode material preparation method

A negative electrode material, lithium vanadate technology, applied in the preparation of lithium vanadate negative electrode material, the field of lithium vanadate negative electrode material, to achieve the effect of increasing contact area, improving electrochemical performance, improving stability and conductivity

Active Publication Date: 2015-06-03
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of the above defects or improvement needs of the prior art, the present invention provides a lithium vanadate negative electrode material, negative electrode, battery and negative electrode material preparation method, the purpose of which is to improve the conductivity and stability of lithium vanadate through a series of improved methods, Utilizing its suitable intercalation and extraction potential and considerable capacity, it can be used as a negative electrode active material, and a preparation method of the lithium vanadate negative electrode material, an electrode and a battery including the negative electrode active material are provided, thus successfully solving the problem of There are many difficult technical problems in the application of lithium vanadate as negative electrode active material

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  • Lithium vanadate anode material, anode, battery and anode material preparation method

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Embodiment 1

[0034] In this embodiment, similar spherical nanoscale lithium vanadate LiVO with a particle size of 300-600 nm is used. 3 as the nuclear department. Using vacuum coating method on LiVO 3 Surface Preparation of Stable Coating Al 2 o 3 layer, then the organic carbon source acetylene is brought into the high-temperature reactor by chemical vapor deposition method with 99.9% high-purity Ar gas as the carrier gas. The coated lithium vanadate surface is pyrolyzed to form a conductive coating of graphitized carbon.

[0035] Through the observation of the transmission electron microscope, it is found that the thickness of the graphitized carbon layer is 25nm, and the surface is uniformly covered with stable Al 2 o 3 layer of spherical LiVO 3 The surface of the core, the area covered is 100% of the surface area of ​​the core, and, Al 2 o 3 The thickness of the layer is about 10nm, which uniformly covers the spherical LiVO 3 Surface, its cladding area is about 70% of the surfa...

Embodiment 2

[0037] In the present embodiment, the nanoscale lithium vanadate Li 3 VO 4 The spherical micron-sized secondary particles formed by agglomeration are used as the core. The particle size of the micron-sized secondary particles is about 2 μm, and the nano-sized lithium vanadate Li 3 VO 4 particles with a diameter of 100 nm. The organic carbon source toluene was brought into the high-temperature reactor by chemical vapor deposition method using high-purity Ar gas with an inert gas of 99.9% as the carrier gas. The reaction temperature was 800°C and the holding time was 200min. Decomposition forms a conductive coating of semi-graphitized carbon.

[0038] Through the observation of transmission electron microscope, it was found that Li 3 VO 4 The thickness of the semi-graphitized carbon layer coated on the surface is 25nm, and the coating layer is uniformly covered on the spherical Li 3 VO 4 On the surface, the area covered is 95% of the surface area of ​​the core. After Ram...

Embodiment 3

[0045]In the present embodiment, adopt particle diameter to be the nanoscale lithium vanadate LiV of the irregular particle shape of 400nm 2 o 5 as the nuclear department. By using pulsed laser deposition on LiV 2 o 5 Prepare a stable coating layer MgO layer on the surface. Next, the chemical vapor deposition method uses high-purity Ar gas with an inert gas of 99.9% as the carrier gas to bring the organic carbon source methane into the high-temperature reactor. The reaction temperature is 400 ° C, and the holding time is 30 minutes. solution to form a conductive coating of amorphous carbon.

[0046] Through the observation of transmission electron microscope, it was found that LiV 2 o 5 The surface is a common coating of amorphous carbon and MgO. The thickness of the cladding layer is about 10nm, and the cladding area is 90% of the surface area of ​​the core, wherein the cladding area of ​​amorphous carbon is about 60% of the surface of the core, and the cladding area o...

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Abstract

The invention discloses a lithium vanadate anode material, an anode, a battery and an anode material preparation method, and belongs to the field of batteries. The lithium vanadate anode material is of a core-shell structure, the core is lithium vanadate, the shell is a coating layer, lithium vanadate is nanometer granules or micrometer level secondary granules formed by nanometer granules, the thickness of the coating layer is 2-30nm, and the coating layer comprises a conductive coating layer or / and a stable coating layer. An organic carbon source is introduced into a high temperature reactor with an inert gas as a carrier by using a chemical vapor deposition method, in order to from the conductive coating layer of amorphous carbon or graphitic carbon on the surface of the core. The conductive coating layer and the stable coating layer are prepared by using a vacuum coating method, a magnetron sputtering method, a pulsed laser deposition method or an atomic layer deposition method. Lithium vanadate is used as an active anode material to obtain high coulombic efficiency, large specific capacity and good rate capability, and the proper embedded escape potential and the considerable volume of lithium vanadate are fully utilized.

Description

technical field [0001] The invention belongs to the field of battery materials, and more specifically relates to a lithium vanadate negative electrode material with a core-shell structure, a negative electrode, a battery and a preparation method of the lithium vanadate negative electrode material. Background technique [0002] With the continuous use of fossil fuels such as petroleum and coal, the earth's resources are exhausted, a large amount of greenhouse gas emissions and environmental pollution are aggravated. In this context, human beings urgently need to find a non-polluting, renewable new energy source to replace traditional energy sources, so as to solve the environmental problems caused by the burning of fossil fuels. Lithium-ion battery, as a non-polluting and renewable new energy source, has many advantages such as high working voltage, high energy density, excellent cycle performance, low price and no memory, and has been widely used in the mobile digital field....

Claims

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Application Information

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IPC IPC(8): H01M4/131H01M4/1391H01M4/62
CPCH01M4/131H01M4/1391H01M4/366H01M4/48H01M4/5825Y02E60/10
Inventor 李会巧邵高琦翟天佑
Owner HUAZHONG UNIV OF SCI & TECH
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