An iron-doped hierarchical germanium dioxide
A germanium dioxide, graded technology, applied to structural parts, electrical components, battery electrodes, etc., can solve problems such as accelerated capacity fading, decreased cycle stability, and shedding of active materials, so as to increase lithium intercalation sites and improve Electrochemical stability, the effect of increasing conductivity
Active Publication Date: 2021-04-27
FUZHOU UNIV
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Problems solved by technology
However, due to the large volume expansion of this type of material in the process of intercalating and removing lithium, it is easy to cause serious shedding of the active material on the pole piece, and the cycle stability drops sharply, which also makes this type of material subject to application. very restrictive
As a conversion-type germanium-based anode material, germanium dioxide has attracted widespread attention due to its high theoretical capacity. However, the conversion reaction with lithium ions is considered irreversible, which makes the capacity decay speed significantly accelerated.
The present invention can greatly improve the electrochemical performance of germanium dioxide through iron doping, but there is no method for synthesizing germanium dioxide with hierarchical structure by means of doping at present, and it has excellent performance in applying it to lithium-ion batteries. Lithium storage performance, so the preparation of iron-doped germanium dioxide has important research significance
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[0019] 1) Add 1 mmol GeO 2 and 0.1 mmol FeCl 3 ·6H 2 O was put into a mixed solution composed of 5-10 ml ethanolamine and 10-20 ml ethanol (the volume ratio of the two was 1:2), and then 2-methylpiperazine was added to adjust the pH of the solution to >7;
[0020] 2) Place the mixture obtained in step 1) in a polytetrafluoroethylene reaction liner, react in an oven at 180°C for 24 hours, and then cool to room temperature;
[0021] 3) The obtained product was washed several times with deionized water, and dried in an oven at 70°C for 12 hours to obtain Fe-GeO 2 yellow powder;
[0022] 4) Annealing the obtained yellow powder in an argon atmosphere at 550-650° C. for 1 hour to obtain the iron-doped germanium dioxide with hierarchical structure.
[0023] The XRD spectra of doped and undoped germanium dioxide are shown in figure 1 . Depend on figure 1 It can be seen that the two lines belong to the pure phase of germanium dioxide, and there are no other miscellaneous peaks. ...
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The invention discloses an iron-doped germanium dioxide with a hierarchical structure, which is composed of GeO 2 and FeCl 3 ·6H 2 O is put into a mixed solution composed of ethanolamine and ethanol in proportion, and after adjusting the pH with 2-methylpiperazine, a simple solvothermal reaction, drying, and annealing are performed to obtain the iron-doped germanium dioxide with a hierarchical structure. The obtained material has good electrochemical stability and high specific capacity, and can be used to prepare lithium ion batteries.
Description
technical field [0001] The invention belongs to the technical field of lithium ion battery materials, and in particular relates to an iron-doped germanium dioxide with hierarchical structure. Background technique [0002] Germanium-based materials have attracted widespread attention because of their higher theoretical capacity and higher conductivity than silicon of the same main group. However, due to the large volume expansion of this type of material in the process of intercalating and removing lithium, it is easy to cause serious shedding of the active material on the pole piece, and the cycle stability drops sharply, which also makes this type of material subject to application. Very restrictive. As a conversion-type germanium-based anode material, germanium dioxide has attracted widespread attention due to its high theoretical capacity. However, the conversion reaction with lithium ions is considered irreversible, which makes the capacity decay rate significantly fast...
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IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/60H01M4/62
CPCY02E60/10
Inventor 魏明灯武俊秀
Owner FUZHOU UNIV