Nano-structure lithium battery positive electrode material and preparation method thereof

A cathode material and nanostructure technology, applied in the field of energy materials, can solve the problems of strong agglomeration tendency, V2O5 low conductivity, low conductivity, etc., and achieve the effect of improving structural stability, good synergistic advantages, and improving cycle stability

Inactive Publication Date: 2020-03-17
南通意华新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even so, there are still two defects in nanostructured V2O5: low electrical conductivity (10-2~10-3Scm-1) and strong tendency to agglomerate, which will inevitably lead to capacity fading
[0005] However, solving the two major defects of V2O5 low conductivity and easy agglomeration at the same time, there are huge technical problems, which is still blank. Therefore, the industry is in urgent need of a

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Aiming at the two defects of low conductivity and easy agglomeration of nano-V2O5 nanosheets, through the co-doping of secondary phase high-conductivity silver nanoparticles and TiO2 nanorods, this embodiment provides a V2O5 nanosheet-TiO2 nanorod-Ag nanoparticle The multi-dimensional heterogeneous nanostructure lithium battery cathode material, using its outstanding synergistic effect and unique multi-dimensional heterostructure, exerts excellent comprehensive electrochemical performance.

[0036] The V2O5 nanosheet-TiO2 nanorod-Ag nanoparticle multidimensional heterogeneous nanostructure lithium battery positive electrode material provided in this example is a multidimensional heterogeneous nanostructure composed of Ag, TiO2 and V2O5 in a weight ratio of 5:15:100. structure, and its preparation method is as follows:

[0037] (1) Add 1.8g commercial V2O5 powder and 22g (NH4)2S2O8 into 180mL deionized water, stir at 50°C for 48h to obtain a golden yellow precipitate, wa...

Embodiment 2

[0042] The difference between this embodiment and Example 1 is step (4): Ag and TiO2 Two kinds of solutions are dissolved in THF solution respectively, obtain the THF solution of 0.5mgmL-1, then according to Ag:TiO2:V2O5=8:12: Mixed at a weight ratio of 100 and stirred for 8 hours, under the driving force of reducing the free energy of the system, assembled into a V2O5 nanosheet-TiO2 nanorod-Ag nanoparticle multi-dimensional heterogeneous nanostructure lithium battery positive electrode material. Then washed and centrifuged, and dried under vacuum at 60°C for 12 hours.

Embodiment 3

[0044] The difference between this example and examples 1 and 2 is step (1): add 50mg V2O5 powder into 50ml formamide solution, stir for 12h to make it fully mixed. The resulting suspension was sonicated for 3 days at room temperature. Then, the supernatant was centrifuged, washed with ethanol, and dried at 70° C. to obtain exfoliated V2O5 nanosheets.

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Abstract

The invention discloses a nano-structure lithium battery positive electrode material and a preparation method thereof. The nano-structure lithium battery positive electrode material is formed by co-doping a two-dimensional V2O5 nanosheet, zero-dimensional Ag nanoparticles and one-dimensional nano TiO2, wherein the weight ratio of Ag to TiO2 to V2O5 is (5-10): (10-20): 100. According to the invention, a liquid phase self-assembly method based on Van der Waals' force is adopted, and one-dimensional nano TiO2 and Ag nano particles are ingeniously and simply assembled on the surface of a V2O5 nanosheet. The self-assembly method has the characteristics of low cost, high efficiency and energy conservation, and can accurately control the load density and distribution of the nanorods and the nanoparticles. The Van der Waals' force-based liquid phase self-assembly method is adopted, and an external cross-linking agent is not introduced, so that the method has the advantages of low cost and mildness compared with a method for preparing the composite material by utilizing a complexing effect.

Description

technical field [0001] The invention belongs to the technical field of energy materials, and in particular relates to a V2O5 nanosheet one-dimensional nano TiO2-Ag nanoparticle nanostructure lithium battery cathode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have become one of the main driving power sources for portable electronic devices, power tools and electric vehicles. With the vigorous development of these electrical appliances, the electrochemical performance of lithium-ion batteries is also required to be higher and higher. In recent years, in terms of the specific capacity of electrode materials, lithium-ion battery negative electrode materials have made great progress, but the positive electrode has not made a major breakthrough, which has become a bottleneck in the development of lithium-ion batteries. The current commercial positive electrode LiCoO2 has a specific capacity of 140mAhg-1, LiMn2O4 is about 150mAhg-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/362H01M4/483H01M4/62H01M4/626H01M4/628H01M10/0525Y02E60/10
Inventor 林建洪李成
Owner 南通意华新材料科技有限公司
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