Iron-doped hierarchical structure 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: 2019-05-17
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) Put 1 mmol GeO 2 and 0.1 mmol FeCl 3 ·6H 2 O put into the mixed solution composed of 5-10 ml ethanolamine and 10-20 ml ethanol (the volume ratio of the two is 1:2), and then add 2-methylpiperazine to adjust the pH of the solution>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) After washing the obtained product with deionized water several times, it was dried in an oven at 70 °C for 12 hours to obtain Fe-GeO 2 of 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 hierarchical structure germanium dioxide.
[0023] The XRD patterns 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 pure-phase germanium dioxide, and there are no other impurity peaks, and it can be seen ...
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The invention discloses an iron-doped hierarchical structure germanium dioxide. A preparation method is as follows: putting GeO2 and FeCl3.6H2O into a mixed solution composed of ethanol amine and ethanol in proportion, regulating the pH by using 2-methyl piperazine, performing simple solvent thermal reaction, drying, and annealing to manufacture the iron-doped hierarchical structure germanium dioxide. The material disclosed by the invention has good electrochemical stability and high specific capacity, and can be used for preparing lithium ion battery.
Description
technical field [0001] The invention belongs to the technical field of lithium ion battery materials, and in particular relates to an iron-doped hierarchical structure germanium dioxide. Background technique [0002] Germanium-based materials have received extensive attention due to their higher theoretical capacity and higher electrical conductivity than silicon of the same main group. However, due to the large volume expansion of these materials in the process of intercalation and delithiation, 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 suffer in application. big restriction. As a conversion-type germanium-based anode material, germanium dioxide has attracted widespread attention because of its high theoretical capacity. However, because its conversion reaction with lithium ions is considered to be irreversible, the rate of capacity decay is significantly acce...
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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