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Amorphous germanium oxide/porous carbon nanofiber and preparation method thereof

A nanofiber, germanium oxide technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of affecting the electrical contact between the active material and the current collector, the degradation of the battery cycle performance, and the material rate capacity Low-level problems, to achieve the effect of improving capacity and cycle performance, improving electron transmission performance, and the method is simple and controllable

Active Publication Date: 2016-09-21
浙江技立新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Germanium-based materials have better stability and faster lithium ion transmission rate, but during the charge and discharge process, with the intercalation / extraction of lithium ions, germanium will produce nearly 330% volume expansion / shrinkage, resulting in its pulverization and fragmentation. On the one hand, it affects the electrical contact between the active material and the current collector, which is not conducive to electron transmission, so that the battery capacity rapidly decays; on the other hand, the solid electrolyte film (SEI) formed between the active material and the electrolyte is continuously thickened. , so that the cycle performance of the battery drops sharply
The oxide of germanium can effectively alleviate the volume expansion caused by the intercalation / extraction of lithium-ion batteries during the charge and discharge process, but the low conductivity of germanium oxide makes the rate capacity of the material low.

Method used

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  • Amorphous germanium oxide/porous carbon nanofiber and preparation method thereof
  • Amorphous germanium oxide/porous carbon nanofiber and preparation method thereof
  • Amorphous germanium oxide/porous carbon nanofiber and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] (1) Weigh 2g of germanium powder with an electronic balance, and put it into a ball mill tank together with 50g of small balls with diameters ranging from 5 to 15mm for ball ink. The mass ratio of balls to materials is 25:1. The rotational speed of the ball mill jar was 300 rpm, and the ball mill was performed for 2 hours to obtain germanium nanoparticles.

[0035] (2) Weigh 0.4g each of P123 and germanium nanoparticles with an electronic balance, place in a 20ml sample bottle, inject 8.8g of N-N dimethylformamide, then accurately weigh 0.8g of polyacrylonitrile and dissolve in the above sample bottle , the sample vial was sealed with parafilm, heated to 60°C and stirred for 24 hours.

[0036] (2) The aluminum foil paper with a cut area of ​​40cm×40cm is close to the flat collector, put 5ml of spinning solution sample into the injection needle, connect the positive pole of the high voltage generator to the spinneret, and the negative pole to the flat collector. The flo...

Embodiment 2

[0039] (1) Weigh 2g of germanium powder with an electronic balance, and put it into a ball mill tank together with 50g of small balls with diameters ranging from 5 to 15mm for ball milling. The mass ratio of balls to materials is 25:1. The rotational speed of the ball mill jar was 400 rpm, and the ball mill was performed for 3 hours to obtain germanium nanoparticles.

[0040] (2) Weigh each 0.3g of P123 and germanium nanoparticles with an electronic balance, place in a 20ml sample bottle, inject 8.9g of N-N dimethylformamide, then accurately weigh 0.6g of polyacrylonitrile and dissolve in the above sample bottle , the sample vial was sealed with parafilm, heated to 60°C and stirred for 24 hours.

[0041] (2) The aluminum foil paper with a cut area of ​​40cm×40cm is close to the flat collector, put 5ml of spinning solution sample into the injection needle, connect the positive pole of the high voltage generator to the spinneret, and the negative pole to the flat collector. The...

Embodiment 3

[0044] (1) Weigh 2g of germanium powder with an electronic balance, and put it into a ball mill pot together with 50g of small balls with diameters ranging from 5 to 15mm for ball milling. The mass ratio of balls to materials is 25:1. The rotational speed of the ball mill jar was 400 rpm, and the ball mill was performed for 3 hours to obtain germanium nanoparticles.

[0045] (2) Weigh 0.2g each of P123 and germanium nanoparticles with an electronic balance, place in a 20ml sample bottle, inject 9.2g of N-N dimethylformamide, then accurately weigh 0.8g of polyacrylonitrile and dissolve in the above sample bottle , the sample vial was sealed with parafilm, heated to 60°C and stirred for 24 hours.

[0046] (2) The aluminum foil paper with a cut area of ​​40cm×40cm is close to the flat collector, put 5ml of spinning solution sample into the injection needle, connect the positive pole of the high voltage generator to the spinneret, and the negative pole to the flat collector. The ...

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Abstract

The invention relates to the field of negative electrode materials for lithium-ion batteries, in particular to an amorphous germanium oxide / porous carbon nanofiber and a preparation method thereof. The amorphous germanium oxide / porous carbon nanofiber comprises a porous carbon nanofiber and an amorphous germanium oxide located on the porous carbon nanofiber; and the mass percentage of the germanium oxide is 10%-40%. A large number of micropores exist in the porous carbon nanofiber, so that active sites of an active material are increased. The electronic transmission performance between the active material and a current collector is improved, so that improvement of the capacity of the lithium-ion battery is facilitated.

Description

technical field [0001] The invention relates to the field of negative electrode materials for lithium ion batteries, in particular to an amorphous germanium oxide / porous carbon nanofiber and a preparation method thereof. Background technique [0002] Lithium-ion batteries are secondary batteries that rely on the movement of lithium ions between the positive and negative electrodes to work. Among them, the positive electrode material is lithium-containing compound, and the negative electrode material is mainly carbon active material. The ability of anode materials to intercalate / extract lithium ions has a huge impact on the capacity of lithium-ion batteries. The commercial anode materials currently used are mainly graphite with a layered structure. However, its theoretical capacity is 372mAh / g lower, making the lithium-ion battery capacity lower. [0003] Silicon and germanium, which are both group IVA elements, have become the best graphite-based negative electrode materi...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/587H01M4/62H01M10/0525B82Y30/00
CPCH01M4/362H01M4/483H01M4/587H01M4/625H01M4/628H01M10/0525B82Y30/00Y02E60/10
Inventor 胡毅何霞沈桢陈仁忠吴克识
Owner 浙江技立新材料股份有限公司
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