High-performance variable-valence metal ion oxide-containing microcrystalline glass electrode material as well as preparation method and application thereof

A technology of variable valence metal ions and glass-ceramics, applied in battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., can solve problems such as not being able to meet the needs of high-power devices, improve negative electrode capacity and cycle stability, and shorten transmission distance , The effect of simple production process

Pending Publication Date: 2022-04-29
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the capacity of current glass electrode materials containing variable-valence

Method used

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  • High-performance variable-valence metal ion oxide-containing microcrystalline glass electrode material as well as preparation method and application thereof
  • High-performance variable-valence metal ion oxide-containing microcrystalline glass electrode material as well as preparation method and application thereof
  • High-performance variable-valence metal ion oxide-containing microcrystalline glass electrode material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: A glass electrode material containing variable valence metal ion oxide and its preparation method

[0019] Weigh ferric oxide and ammonium dihydrogen phosphate, mix them evenly in a mortar, pour them into an alumina crucible, melt them in an air atmosphere, shape them, anneal them, cool them, and finally get a glass material; the melting temperature is 1250 °C, and the holding time is The annealing temperature was 20 min, the annealing temperature was 450 °C, and the annealing time was 2 h, and the glass electrode material (FeP sample) containing variable-valent metal ion oxide was obtained.

[0020] The obtained glass was ground into powder, and the sample powder, acetylene black and PVDF were put into a 50 mL ball mill jar at a speed of 400 r / min for 4 h at a mass ratio of 7:2:1 and 2 ml of N-methylpyrrolidone. , and then spread the paste on the copper foil. Dry under vacuum at 110 °C for 11 h, and after natural cooling, take out the electrode sheet cut in...

Embodiment 2

[0022] Example 2: A high-performance glass-ceramic electrode material containing variable-valence metal ion oxide and its preparation method

[0023] according to figure 1 According to the DSC curve of Example 1, the heat treatment temperature is selected, and the glass powder obtained in Example 1 is placed in an alumina ceramic state. powder. That is to obtain high-performance glass-ceramic electrode materials containing variable-valence metal ion oxides (A845-0.5h sample)

[0024] Detect the high-performance glass-ceramic electrode material containing variable-valence metal ion oxide obtained in embodiment 2, such as figure 2 It can be seen from the XRD pattern that the precipitated crystals are mainly Fe 3 (P 2 o 7 ) 2 .

[0025] Put the sample powder, acetylene black and PVDF in a mass ratio of 7:2:1 and 2ml of N-methylpyrrolidone into a 50mL ball mill jar for 4 h at a speed of 400 r / min, and then spread the slurry on the copper on foil. Dry under vacuum at 110 ...

Embodiment 3

[0027] Example 3: A high-performance glass-ceramic electrode material containing variable-valence metal ion oxide and its preparation method

[0028] according to figure 1 For the DSC curve of Example 1, the heat treatment temperature was selected. The glass powder obtained in Example 1 was placed in an atmosphere furnace. Under a reducing atmosphere, the heat treatment temperature was 845°C, kept for 0.5 h, cooled naturally to room temperature, and then taken out and ground into powder. That is to obtain high-performance glass-ceramic electrode materials containing variable-valence metal ion oxides (R845-0.5h sample)

[0029] Detect the high-performance glass-ceramic electrode material containing variable-valence metal ion oxide obtained in embodiment 3, such as figure 2 It can be seen from the XRD pattern that the precipitated crystals are mainly Fe 2 (P 4 o 12 ) and Fe 2 Fe 5 (P 2 o 7 ) 4 .

[0030] Put the sample powder, acetylene black and PVDF in a mass ratio ...

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Abstract

The invention relates to a high-performance variable-valence metal ion oxide-containing microcrystalline glass electrode material and a preparation method and application thereof, and belongs to the field of energy storage and material preparation. The preparation method of the microcrystalline glass electrode material comprises the following steps: performing high-temperature heat treatment on oxide glass containing variable valence metal ions in an air or reducing atmosphere within a range higher than a crystallization initial temperature for 0.5-24 hours to prepare the high-performance nano microcrystalline glass electrode material containing variable valence metal ions. According to the invention, the content of low-valence metal ions in the glass is improved, so that the conductivity of an electrode is improved, the precipitation of crystals is promoted, and the energy storage site is improved; and the reversible capacity and the cycling stability of the glass electrode material containing variable valence metal ions are greatly improved. In addition, the preparation method is simple in production process and free of environmental pollution, and has an excellent development prospect.

Description

technical field [0001] The invention relates to a high-performance glass-ceramic electrode material containing variable-valence metal ion oxide and its preparation method and application, belonging to the field of energy storage and material preparation. Background technique [0002] In recent years, with the shortage of resources and the continuous deterioration of the ecological environment, people urgently need a new energy technology to meet the sustainable development of human society. Lithium-ion batteries have attracted people's attention due to their high energy density, large specific capacity, stable cycle performance, and less environmental pollution, and have been widely used in daily life. The microstructure of traditional negative electrode materials is attacked by lithium ions during the cycle, and then a huge volume change occurs, resulting in structural collapse or even pulverization, which greatly reduces the cycle stability and limits its use. [0003] ...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/48H01M4/13H01M10/0525
CPCH01M4/62H01M4/628H01M4/483H01M4/13H01M10/0525H01M2004/027
Inventor 张艳飞齐世斌李翔宇
Owner QILU UNIV OF TECH
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