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A ring-shaped nano-germanium dioxide/polyionic liquid composite material and its preparation method and application

A technology of polyionic liquid and germanium dioxide, which is applied in the direction of secondary batteries, electrochemical generators, structural parts, etc., can solve problems such as unsatisfactory cycle performance, capacity fading, and drastic volume changes of germanium-based materials, and achieve excellent dissolution performance, high charge and discharge capacity, and good cycle performance

Active Publication Date: 2020-10-20
SHANGQIU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the cycle performance of germanium-based materials as anode materials for lithium-ion batteries is not ideal. This is because the volume of germanium-based materials changes drastically due to the repeated intercalation and extraction of lithium during charge and discharge, and the drastic volume changes will lead to active materials and aggregates. The fluid loses electrical contact, causing rapid capacity decay

Method used

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  • A ring-shaped nano-germanium dioxide/polyionic liquid composite material and its preparation method and application
  • A ring-shaped nano-germanium dioxide/polyionic liquid composite material and its preparation method and application
  • A ring-shaped nano-germanium dioxide/polyionic liquid composite material and its preparation method and application

Examples

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Embodiment 1

[0028] The preparation method of the annular nano-germanium dioxide / polyionic liquid composite material of the present embodiment, the steps are as follows:

[0029] (1) First, 1.5 g of bisvinylimidazolium bromide ionic liquid and 1.5 g of germanium tetrachloride were dissolved in 15 mL of absolute ethanol solution, and the above solution was fully stirred for 2 h;

[0030] (2) Add 375 mg of azobisisobutyronitrile to the above-mentioned mixed solution, heat and stir in an oil bath at 75 °C for 10 hours, and obtain a white blocky solid material through polymerization;

[0031] (3) Dry the obtained massive solid material in a vacuum oven at 60 °C for 8 h, and grind it evenly with an agate mortar to obtain a white powder material.

[0032] from figure 1 From the scanning electron microscope image of the composite material, it can be seen that the nano-germanium dioxide in the prepared composite material is uniformly dispersed in the polyionic liquid in the form of a ring. The s...

Embodiment 2

[0035] The preparation method of the annular nano-germanium dioxide / polyionic liquid composite material of the present embodiment, the steps are as follows:

[0036] (1) First, dissolve 1.5 g of bisvinylimidazolium bromide ionic liquid and 1.5 g of germanium tetrachloride in 20 mL of absolute ethanol solution, and stir the above solution for 2 h;

[0037] (2) Add 1.5 g of divinylbenzene to the mixture prepared above, and stir for 2.5 h;

[0038] (3) Add 500 mg of azobisisobutyronitrile to the above-mentioned mixed solution, heat and stir in an oil bath at 70 °C for 10 h, and polymerize to obtain a yellow blocky solid material;

[0039] (4) Dry the obtained massive solid material in a vacuum oven at 60 °C for 8 h, and grind it evenly with an agate mortar to obtain a yellow powder material.

[0040] As can be seen from the scanning electron microscope images of the composite material in this example, the nano-germanium dioxide in the prepared composite material is uniformly dis...

Embodiment 3

[0043] The preparation method of the annular nano-germanium dioxide / polyionic liquid composite material of the present embodiment, the steps are as follows:

[0044] (1) First, 1.5 g of 1-vinyl-3-butylimidazolium bromide ionic liquid and 1.5 g of germanium tetrachloride were dissolved in 20 mL of absolute ethanol solution, and the above solution was fully stirred for 2 h;

[0045] (2) Add 1.5 g of divinylbenzene to the mixture prepared above, and stir for 2.5 h;

[0046] (3) Add 500 mg of azobisisobutyronitrile to the mixture prepared above, heat and stir in an oil bath at 70 °C for 15 hours, and polymerize to obtain a yellow blocky solid material;

[0047] (4) Dry the obtained massive solid material in a vacuum oven at 60 °C for 8 h, and grind it evenly with an agate mortar to obtain a yellow powder material.

[0048] As can be seen from the scanning electron microscope images of the composite material in this example, the nano-germanium dioxide in the prepared composite mat...

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Abstract

The invention discloses an annular nano germanium dioxide / polyion liquid composite material and a preparation method and application thereof. The composite material is annular germanium dioxide nanoparticles dispersed in polyion liquid. In the composite material, germanium dioxide is uniformly distributed in the polyion liquid. According to the invention, an annular nano germanium dioxide composite material dispersed in a polyionic liquid carrier is prepared through a free radical initiated polymerization method by taking vinyl functionalized imidazolium ionic liquid, germanium tetrachloride,divinylbenzene and azodiisobutyronitrile as raw materials and absolute ethyl alcohol as a solvent. As a lithium ion battery negative electrode material, the annular nano germanium dioxide / polyion liquid composite material has first reversible capacity of 1711mAh / g under the current density of 200mA / g, has a capacity retention ratio of 40-55% after 100 cycles, and shows high charge-discharge capacity and good cycle performance.

Description

technical field [0001] The invention belongs to the technical field of inorganic energy storage materials, and in particular relates to a nano-germanium dioxide uniformly dispersed in a polyionic liquid carrier in a ring shape and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high output voltage, and large output power. However, in the current lithium-ion batteries, due to the limitation of the positive electrode potential, commercial lithium-ion batteries generally use lithium cobalt oxide or lithium iron phosphate as the positive electrode material, and the specific capacity is low. In order to further increase the energy density of the battery as a whole, it is necessary to further improve the negative electrode material of lithium-ion batteries, and silicon-based materials are typical alloyed negative electrode materials. At present, silicon-based negative electrodes such as s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M10/0525
CPCH01M4/36H01M4/364H01M4/48H01M10/0525Y02E60/10
Inventor 张永亚张南张建伟张存良胡新成张旭魏伟瞿鹏
Owner SHANGQIU NORMAL UNIVERSITY
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