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A kind of multi-dimensional heterogeneous nanostructure lithium battery cathode material and preparation method thereof

A nanostructure and positive electrode material technology, applied in battery electrodes, structural parts, circuits, etc., can solve problems such as low conductivity, capacity fading, and easy agglomeration, and achieve the effects of inhibiting electrode structure damage, increasing layer spacing, and buffering stress Effect

Active Publication Date: 2017-12-01
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Even so, however, the nanostructured V 2 o 5 There are also two defects: low conductivity (10 -2 ~10 -3 S cm -1 ) and a strong tendency to agglomerate, which will inevitably lead to capacity fading
[0005] However while addressing V 2 o 5 Low electrical conductivity and easy agglomeration are two major defects, and there are huge technical problems, which are still blank

Method used

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  • A kind of multi-dimensional heterogeneous nanostructure lithium battery cathode material and preparation method thereof
  • A kind of multi-dimensional heterogeneous nanostructure lithium battery cathode material and preparation method thereof
  • A kind of multi-dimensional heterogeneous nanostructure lithium battery cathode material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0040] for Nano V 2 o 5 The two major defects of low conductivity and easy agglomeration of nanosheets, through the secondary phase of high conductivity silver nanoparticles and TiO 2 Co-doping of nanorods, this example provides a V 2 o 5 Nanosheet-TiO 2 The nanorod-Ag nanoparticle multidimensional heterogeneous nanostructure lithium battery cathode material, using its outstanding synergistic effect and unique multidimensional heterogeneous structure, exerts excellent comprehensive electrochemical performance.

[0041] This example provides the V 2 o 5 Nanosheet-TiO 2 Nanorod-Ag nanoparticles multidimensional heterogeneous nanostructure lithium battery cathode material is composed of Ag, TiO 2 and V 2 o 5 A multidimensional heterogeneous nanostructure composed of three components with a weight ratio of 5:15:100, the preparation method is as follows:

[0042] (1) Put 1.8g commercial V 2 o 5 powder and 22g (NH 4 ) 2 S 2 o 8 Add it into 180mL deionized water, stir...

Embodiment 2

[0048] The difference between this example and Example 1 is step (4): the Ag and TiO 2 Both solutions were dissolved in THF solution separately to obtain 0.5 mg mL –1 THF solution, then according to Ag:TiO 2 :V 2 o 5 =8:12:100 weight ratio mixed and stirred for 8 hours, under the driving force of reducing the free energy of the system, assembled into V 2 o 5 Nanosheets—TiO 2 Nanorod—Ag nanoparticle multidimensional heterogeneous nanostructure lithium battery cathode material. Then washed and centrifuged, and dried under vacuum at 60°C for 12 hours.

Embodiment 3

[0050] The difference between this example and Example 1 and 2 is step (1): the 50mgV 2 o 5 The powder was added to 50ml of formamide solution, stirred 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 the stripped V 2 o 5 Nanosheets.

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Abstract

The invention discloses a multi-dimensional hetero-nanostructure lithium battery cathode material and a preparing method thereof. The multi-dimensional hetero-nanostructure lithium battery anode material is formed by a two-dimensional V2O5 nanosheet, zero-dimensional Ag nanoparticles and one-dimensional nano TiO2 in a doping mode, and the weight ratio of Ag to TiO2 to V2O5 is (5-10) to (10-20) to 100. A liquid-phase self-assembling method based on Van der Waal force is utilized to ingeniously and concisely assemble the one-dimensional nano TiO2 and the Ag nanoparticles on the surface of the V2O5 nanosheet. The self-assembling method has the characteristics of being low in cost, high in efficiency and capable of saving energy and further can accurately control the load density and distribution of nanorods and the nanoparticles. By means of the liquid-phase self-assembling method based on the Van der Waal force, since a foreign cross-linking agent is avoided, compared with a method of preparing compound materials through complexing action, the liquid-phase self-assembling method has the characteristics of being low in cost and moderate. Compared with a pure V2O5 nanosheet, the multi-dimensional hetero-nanostructure cathode material shows great collaboration advantage in the aspects of reversible capacity, rate capability and cycling stability.

Description

technical field [0001] The invention belongs to the technical field of energy materials and relates to a V 2 o 5 Nanosheet-one-dimensional nano-TiO 2 -Ag nanoparticle multidimensional heterogeneous nanostructure lithium battery positive electrode material and 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 cathode LiCoO 2 Specific capacity is 140 mA h g -1 , L...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/38H01M10/0525
CPCH01M4/362H01M4/38H01M4/48H01M10/0525Y02E60/10
Inventor 孙克宁朱晓东闫杜娟乐士儒高啸天
Owner HARBIN INST OF TECH
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