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A kind of ionic liquid/germanium quantum dot composite material and its preparation method and application

A technology of ionic liquids and composite materials, which is applied in the field of ionic liquid/germanium quantum dot composite materials and its preparation, can solve the problems of capacity attenuation, active material fragmentation, pulverization, and unsatisfactory cycle performance, so as to achieve stable cycle performance and guarantee The effect of stability

Active Publication Date: 2022-06-28
SHANGQIU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when metal germanium is used as the negative electrode material of lithium-ion batteries, the volume of germanium metal changes drastically due to the repeated intercalation and extraction of lithium during the charging and discharging process, and the drastic volume change will lead to the crushing and pulverization of the active material, and detachment from the current collector. Loss of electrical contact, resulting in rapid capacity decay during cycling, and unsatisfactory cycle performance

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  • A kind of ionic liquid/germanium quantum dot composite material and its preparation method and application
  • A kind of ionic liquid/germanium quantum dot composite material and its preparation method and application
  • A kind of ionic liquid/germanium quantum dot composite material and its preparation method and application

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preparation example Construction

[0037] The invention provides a preparation method of an ionic liquid / germanium quantum dot composite material, and the preparation method comprises the following steps:

[0038] (1), a certain amount of imidazolium bromide and germanium tetrachloride are stirred and dissolved in the ethanol liquid to obtain the first mixed solution.

[0039] In a specific embodiment of the present invention, the initiator in step (1) is azobisisobutyronitrile.

[0040] In a specific embodiment of the present invention, in step (1), the amount of ethanol liquid added accounts for 75% to 85% of the mass of the first mixed solution (such as 75%, 75.5%, 76%, 76.5%, 77%, 77.5%, 78%, 78.5%, 79%, 79.5%, 80%).

[0041] In a specific embodiment of the present invention, the stirring time in step (1) is all 1-5h (such as 1h, 1.5h, 2h, 2.5h, 3h, 3.5h, 4h, 4.5h, 5h).

[0042] In a specific embodiment of the present invention, the mass ratio of imidazolium bromide and germanium tetrachloride is (1.2~5):...

Embodiment 1

[0055] A preparation method of an ionic liquid / germanium quantum dot composite material provided by an embodiment of the present invention includes the following steps:

[0056] (1), the imidazolium bromide of 1.8g and the germanium tetrachloride of 1.2g (the mass ratio of imidazolium bromide and germanium tetrachloride is 3:2) are stirred and dissolved in the ethanol liquid of 15ml, stirred for 2.5h , to obtain the first mixed solution;

[0057] (2), add the divinylbenzene of 0.6g in the first mixed solution obtained in step (1), stir 2.5h, obtain the second mixed solution;

[0058] (3), adding 0.6 g of azobisisobutyronitrile to the second mixed solution obtained in step (2), heating in an oil bath at 75° C. and stirring for 10 h to obtain the third mixed solution;

[0059] (4), 15ml of newly prepared NaBH 4 The solution (mass fraction of 10%) is added to the third mixed solution obtained in step (3), and after reduction, a yellow blocky ionic liquid / germanium quantum dot c...

Embodiment 2

[0069] A preparation method of an ionic liquid / germanium quantum dot composite material provided in this embodiment includes the following steps:

[0070] (1), with the imidazolium bromide of 1.2g and the germanium tetrachloride of 0.8g (the mass ratio of imidazolium bromide and germanium tetrachloride is 3:2) stirring and dissolving in the ethanol liquid of 10ml, stirring 3h, to obtain the first mixed solution;

[0071] (2), add the divinylbenzene of 0.4g in the first mixed solution obtained in step (1), stir 3h, obtain the second mixed solution;

[0072] (3), adding 0.4 g of azobisisobutyronitrile to the second mixed solution obtained in step (2), heating in an oil bath at 80° C. and stirring for 12 h to obtain a third mixed solution;

[0073] (4), 8ml of newly prepared NaBH 4 The solution (mass fraction of 6%) is added to the third mixed solution obtained in step (3), and after reduction, a yellow blocky ionic liquid / germanium quantum dot composite material is obtained; ...

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Abstract

The invention provides a preparation method of an ionic liquid / germanium quantum dot composite material. First, a certain amount of imidazolium bromide and germanium tetrachloride are stirred and dissolved in an ethanol liquid, and then an initiator is added for initiation, and a crosslinking agent is added for crosslinking. reaction, followed by NaBH 4 The blocky ionic liquid / germanium quantum dot composite material is obtained after the solution is reduced, and the powdered ionic liquid / germanium quantum dot composite material is obtained after vacuum drying and grinding. The diameter of the germanium quantum dots in the composite material prepared by the present invention is 2-8nm, and the germanium quantum dots are uniformly distributed inside the ionic liquid; the composite material is used as a negative electrode material of a lithium ion battery, and is reversible for the first time under a current density of 200mA / g. The capacity can reach 901mAh / g, and after 100 cycles, the capacity retention rate is 60% to 75%. The composite material shows high charge and discharge capacity and good cycle performance as the negative electrode material of lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of inorganic energy storage materials, and in particular relates to an ionic liquid / germanium quantum dot composite material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have incomparable advantages over other batteries. Lithium-ion batteries have high energy density, high output voltage, and high output power. However, in current lithium-ion batteries, due to the limitation of positive electrode potential, commercial lithium-ion batteries generally use lithium cobalt oxide. Or lithium iron phosphate as a positive electrode material, the specific capacity is low, in order to further improve the overall energy density of the battery, it is necessary to further improve the negative electrode material of the lithium ion battery, and the silicon-based material is a typical alloyed negative electrode material. Silicon-based anodes such as silicon-carbon cla...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/60H01M10/0525
CPCH01M4/362H01M4/38H01M4/60H01M10/0525H01M2004/027Y02E60/10
Inventor 魏伟贾方方张永亚胡新成张建伟陈亚梁磊瞿鹏徐茂田
Owner SHANGQIU NORMAL UNIVERSITY