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S-SnO2/Ti3C2 two-dimensional nano lithium ion battery cathode material and preparation method thereof

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, nanotechnology, etc., can solve problems such as low strength and weak van der Waals force, and achieve the effect of improving electric capacity and relieving powder agglomeration

Inactive Publication Date: 2016-10-12
SHAANXI UNIV OF SCI & TECH
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Problems solved by technology

Sun et al. prepared two-dimensional layered nanomaterials MXene-Ti 3 C 2 Dimethyl sulfoxide is embedded between the sheets, and the storage capacity is improved by opening the interlayer distance. The experimental results show that the MXene-Ti intercalated with dimethyl sulfoxide 3 C 2 The capacitance has been improved (Dandan Sun, MingshanWang, Zhengyang Li, GuangxinFan, Li-Zhen Fan, Aiguo Zhou, Two dimensional Ti 3 C 2 as anode material for Li-ion batteries,[J].Electrochemistry Communications 47(2014)80–83.); Zhu et al. used chemical vapor deposition to prepare tin dioxide-supported graphene and coated carbon on its surface (SnO 2 / G-C), showing that compared to SnO 2 The conductivity of -G is significantly improved to increase the charge-discharge capacity of the battery (Yun Guang Zhu, Ye Wang, Jian Xie, Gao-ShaoCao, Tie-Jun Zhu, Xinbing Zhao, Hui Ying Yang, Effects of Graphene Oxide Function Groups on SnO 2 / Graphene Nanocomposites for Lithium Storage Application,[J].Electrochimica Acta 154(2015)338–344); In the above study, the van der Waals force between graphene carbon layers is weak and the strength is low

Method used

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  • S-SnO2/Ti3C2 two-dimensional nano lithium ion battery cathode material and preparation method thereof
  • S-SnO2/Ti3C2 two-dimensional nano lithium ion battery cathode material and preparation method thereof
  • S-SnO2/Ti3C2 two-dimensional nano lithium ion battery cathode material and preparation method thereof

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Embodiment 1

[0021] A kind of S-SnO of this embodiment 2 / Ti 3 C 2 Two-dimensional nano-lithium ion battery negative electrode materials, including two-dimensional layered material Ti 3 C 2 , the two-dimensional layered material Ti 3 C 2 The interlayer and surface are loaded with granular tin dioxide, and the surface is coated with sulfur.

[0022] This embodiment includes the following steps:

[0023] (1) The ternary layered Ti 3 AlC 2 High-energy ball milling of ceramic powder for 4 hours, rotating speed 400r / min, ball-to-material ratio 10:1, drying at 60°C after refining the powder, to obtain Ti with a particle size of 8-10μm 3 AlC 2 ceramic powder;

[0024] (2) Ti obtained in step (1) 3 AlC 2 Take 2g of the ceramic powder and immerse it in 100mL of 40wt% hydrofluoric acid solution to react for 48h; stir, and centrifuge and wash the corrosion products with deionized water until the pH of the centrifuged supernatant is 5; then wash with absolute ethanol for 3 times ; The res...

Embodiment 2

[0028] A kind of S-SnO of this embodiment 2 / Ti 3 C 2 Two-dimensional nano-lithium ion battery anode material, two-dimensional layered material Ti 3 C 2 The interlayer and surface are loaded with granular tin dioxide, and the surface is coated with sulfur.

[0029] This embodiment includes the following steps:

[0030] (1) The ternary layered Ti 3 AlC 2 High-energy ball milling of ceramic powder for 4 hours, rotating speed 400r / min, ball-to-material ratio 10:1, drying at 40°C after refining the powder, to obtain Ti with a particle size of 20-50μm 3 AlC 2 ceramic powder;

[0031] (2) Ti obtained in step (1) 3 AlC 2 Take 2g of ceramic powder and immerse it in 50mL of 40wt% hydrofluoric acid solution to react for 48h; stir, and centrifuge and wash the corrosion products with deionized water until the pH of the centrifuged supernatant is 5; then wash with absolute ethanol for 3 times ; The resulting solid sample is dried to obtain a two-dimensional layered nanomaterial ...

Embodiment 3

[0034] A kind of S-SnO of this embodiment 2 / Ti 3 C 2 Two-dimensional nano-lithium ion battery anode material, two-dimensional layered material Ti 3 C 2 The interlayer and surface are loaded with granular tin dioxide, and the surface is coated with sulfur.

[0035] This embodiment includes the following steps:

[0036] (1) The ternary layered Ti 3 AlC 2 High-energy ball milling of ceramic powder for 3 hours, speed of 400r / min, ball-to-material ratio of 10:1, drying at 50°C after refining the powder, to obtain Ti with a particle size of 30-60μm 3 AlC 2 ceramic powder;

[0037] (2) Ti obtained in step (1) 3 AlC 2 Take 3g of ceramic powder and immerse it in 60mL of 40wt% hydrofluoric acid solution to react for 24h; stir, and centrifuge and wash the corrosion products with deionized water until the pH of the centrifuged supernatant is 6; then wash with absolute ethanol for 3 times ; The resulting solid sample is dried to obtain a two-dimensional layered nanomaterial Ti ...

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Abstract

The invention discloses an S-SnO2 / Ti3C2 two-dimensional nano lithium ion battery cathode material and a preparation method thereof. The preparation method includes: preparing a high-purity ternary layered Ti3AlC2 ceramic block by vacuum sintering, and subjecting the ceramic block to high-energy ball milling to obtain Ti3AlC2 ceramic powder with grain size of 8-75 microns; immersing the Ti3AlC2 ceramic powder in a hydrofluoric acid solution, stirring, carrying out corrosion reaction, and centrifugally washing to obtain a two-dimensional layered nano material Mxene-ti3C2; loading granular tin dioxide among layers and on the surface of the two-dimensional layered material Ti3C2, and coating the surface of the two-dimensional layered material with sulfur; adopting a one-step hydrothermal method to utilize thioacetamide to provide a sulfur source so as to successfully prepare the S-SnO2 / Ti3C2 nano composite material. The material has the advantages of simple preparation process, controllable process and low cost and has two-dimensional layered characteristics like graphene; MXene-ti3C2 is uniform in layering, large in specific surface area and high in conductivity, SnO2 particles are fine and uniform in distribution, a sulfur layer is uniform in coating, photocatalytic performance is good, and biological affinity is high; accordingly, the material is applicable to the fields of photocatalysis, wastewater treatment, lithium ion batteries, supercapacitors and biological sensors.

Description

technical field [0001] The invention belongs to the technical field of preparation and application of nanometer functional materials, in particular to a kind of S-SnO 2 / Ti 3 C 2 Two-dimensional nanometer lithium-ion battery negative electrode material and its preparation method,. Background technique [0002] Ti 3 AlC 2 It is a special compound between metal and ceramics, and has the excellent properties of both metals and ceramics. It not only has metal properties, but also has good thermal conductivity and electrical conductivity at room temperature, has low Vickers microhardness and high elastic modulus and shear modulus, can be machined, and can be processed at a high It is plastic at high temperature; at the same time, it has the properties of ceramics, with high yield strength, high melting point, high thermal stability and good oxidation resistance. Bring forth the new through the use of HF on the ternary layered Ti 3 AlC 2 Corrosion studies leading to typica...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/583H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/48H01M4/583H01M4/62H01M10/0525H01M2004/021Y02E60/10
Inventor 王芬王子婧曹敏娟朱建锋杨海波
Owner SHAANXI UNIV OF SCI & TECH
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