ge/geo for lithium-ion batteries 2 ‑Mesoporous carbon composite electrode material preparation and application

A lithium-ion battery and composite electrode technology, which is applied in the field of power lithium-ion battery materials, can solve the problems of poor conductivity, volume change, and poor cycle performance, and achieve high-rate charge and discharge characteristics, good application prospects, and long cycle life. Effect of Discharge Characteristics

Active Publication Date: 2017-08-25
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The common features of this type of electrode materials are poor electrical conductivity and huge volume change during lithiation, resulting in poor cycle performance.
Ge / GeO has not yet been prepared 2 -Related patent reports on mesoporous carbon composite electrode materials

Method used

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  • ge/geo for lithium-ion batteries <sub>2</sub> ‑Mesoporous carbon composite electrode material preparation and application
  • ge/geo for lithium-ion batteries <sub>2</sub> ‑Mesoporous carbon composite electrode material preparation and application
  • ge/geo for lithium-ion batteries <sub>2</sub> ‑Mesoporous carbon composite electrode material preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] First, 10 grams of mesoporous carbon was refluxed with 26% nitric acid at 60° C. for 1 hour. Disperse 36 grams of germanium chloride in an appropriate amount of ethanol with a concentration of 95% by volume, stir with a magnetic stirrer for 20 minutes, then add mesoporous carbon with a concentration of 26% by weight of nitric acid, stir, and ultrasonically 5 minutes, and dried at 70° C. for 2 hours to obtain a powder. The resulting powder was then placed in 5% H 2 / 95% Ar atmosphere tube furnace and calcined at 600℃ for 6 hours to obtain Ge / GeO 2 - Mesoporous carbon composites.

[0033] Obtained by XRD experiment as figure 1 Ge / GeO shown 2 - XRD patterns of mesoporous carbon composites, by figure 1 It can be seen that the synthesis of Ge and GeO 2 The complex, its diffraction peak position and the standard spectrum of Ge (JCPDS, 089-2768) and GeO 2 The standard map (JCPDS, 036-1463) matches.

[0034] obtained by transmission electron microscopy figure 2 shown ...

Embodiment 2

[0038] First, 20 g of mesoporous carbon was refluxed with 15% nitric acid at 70° C. for 0.5 hour. Disperse 40 grams of germanium hydroxide in an appropriate amount of ethanol with a concentration of 95% by volume, stir with a magnetic stirrer for 10 minutes, then add the above-mentioned mesoporous carbon treated with nitric acid, stir and ultrasonic for 8 minutes, and dry at 60°C A powder was obtained in 3 hours. The resulting powder was then placed in 5% H 2 / 95%Ar atmosphere tube furnace calcined at 700℃ for 4 hours to obtain Ge / GeO 2 - Mesoporous carbon composites. Lithium-ion battery assembly: by mass ratio Ge / GeO 2 - Mesoporous carbon composite: polytetrafluoroethylene: acetylene black = 90:10:5 mixed and ground and evenly coated on the copper foil as the positive electrode, the reference electrode and the counter electrode are metal lithium, and the electrolyte is made of 1M LiPF 6 EC+DMC+EMC (EC / DMC / EMC =1 / 1 / 1 v / v / v) solution. All assembly takes place in the glove ...

Embodiment 3

[0042] First, 50 g of mesoporous carbon was refluxed for 2 hours at 50°C with 20% by weight nitric acid. Disperse 230 grams of carboxyethyl germanium in an appropriate amount of ethanol with a concentration of 95% by volume, stir with a magnetic stirrer for 20 minutes, then add the above-mentioned mesoporous carbon treated with nitric acid, stir and ultrasonic for 10 minutes, and bake at 50 ° C Dry for 4 hours to obtain a powder. The resulting powder was then placed in 5% H 2 / 95%Ar atmosphere tube furnace calcined at 700℃ for 2 hours to obtain Ge / GeO 2 - Mesoporous carbon composites. Lithium-ion battery assembly: by mass ratio Ge / GeO 2 - Mesoporous carbon composite: polytetrafluoroethylene: acetylene black = 83:15:5 mixed and ground, and evenly coated on copper foil as the positive electrode, the counter electrode is graphite carbon, and the electrolyte is made of 1M LiPF 6 EC+DMC+EMC (EC / DMC / EMC =1 / 1 / 1 v / v / v) solution. All assembly takes place in the glove box.

[0043...

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Abstract

The invention belongs to the field of lithium ion battery material science, and particularly relates to a preparation method of a Ge / GeO2-mesoporous carbon composite electrode material with high performance and an application of the Ge / GeO2-mesoporous carbon composite electrode material. The method comprises the following steps: refluxing mesoporous carbon with nitric acid at 50-70 DEG C for 0.5-2 hours; dispersing a germanium salt into a proper amount of ethanol, and stirring the germanium salt with a magnetic stirrer for 5-20 minutes; adding the mesoporous carbon, further stirring for 5-20 minutes, ultrasonically treating for 5-10 minutes, and drying the solution at 50-70 DEG C for 2-4 hours; burning the obtained powder in an N2 atmosphere tube furnace at 600-800 DEG C for 2-6 hours, so as to obtain the Ge / GeO2-mesoporous carbon composite material. The prepared composite material is assembling into a lithium ion battery, with the material as a cathode of the battery, and the material doped with a compound as an anode of the battery. The technology is simple and convenient, available in raw materials, good in repeatability and free of obvious pollutant emission, and the Ge / GeO2-mesoporous carbon composite electrode material can be massively produced, and conforms to the environmental requirements.

Description

technical field [0001] The invention belongs to the field of power lithium ion battery materials, in particular to a high-performance Ge / GeO 2 - Preparation method and application of mesoporous carbon composite electrode material. Background technique [0002] With the development of technology, the market has higher and higher requirements for lithium-ion batteries. Existing lithium-ion battery electrode materials cannot meet the needs of high power density, high rate performance and high safety power lithium batteries, and can not act as storage and conversion devices for intermittent energy in nature. Compared with carbon materials, the theoretical capacity of germanium is 1568 mAh / g (the highest can form Li 17 Ge 4 ), which is about four times the theoretical capacity of carbon. At the same time, the synthesis method of germanium is more diversified and controllable, so it has become one of the best candidate materials for power lithium-ion battery anode materials. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/13H01M4/139H01M10/0525
CPCH01M4/13H01M4/139H01M4/362H01M4/38H01M10/0525Y02E60/10
Inventor 曾令兴黄晓霞钱庆荣陈庆华黄宝铨肖荔人
Owner FUJIAN NORMAL UNIV
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