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Preparation and application of lithium-rich laminar metal oxide as negative electrode material of lithium ion cell

A negative electrode material, a technology of vanadium oxide, applied in battery electrodes, vanadium compounds, circuits, etc., can solve the problems of lowering battery voltage and limiting applications, and achieves the effects of high specific energy, uniform shape, and convenient operation

Inactive Publication Date: 2012-06-20
GUANGZHOU HKUST FOK YING TUNG RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, in the negative electrode material used as the main body of insertion, the lithium ion needs to overcome the least energy in the process of insertion and deintercalation is titanium oxide, but its relatively high discharge platform (about 1.6V), compared with graphite and vanadium. The discharge platform with lower oxide (about 0.1V) generally reduces the battery voltage, which greatly limits its application in high-power environments

Method used

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  • Preparation and application of lithium-rich laminar metal oxide as negative electrode material of lithium ion cell
  • Preparation and application of lithium-rich laminar metal oxide as negative electrode material of lithium ion cell
  • Preparation and application of lithium-rich laminar metal oxide as negative electrode material of lithium ion cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh 3.8235 grams of vanadium trioxide and 2.2167 grams of lithium carbonate powder respectively, dissolve in 300 mL of distilled water, then slowly add 12.06 grams of adipic acid powder, at 80 o Magnetically stirred at C, and evaporated to dryness at constant temperature (the molar ratio of vanadium trioxide: lithium carbonate: adipic acid is 1:1.20:2). Transfer the evaporated mixture to a corundum ark, move it into a tube furnace, and pass it into a protective atmosphere Ar / H 2 (95:5 vol / vol%) mixed gas. First, let it stand under a protective atmosphere for 2 hours, then raise the temperature to 1000°C at a rate of 1°C / min, and keep it for 8 hours, and then cool down to room temperature at a rate of 1°C / min. A sample was taken out and ground in a mortar to obtain a black powder product. Do XRD, SEM and XPS analysis of the obtained products respectively, such as figure 1 (a), figure 2 (a), Figure 4 (a), indicating that the product is Li 1+x VO 2 . After the ...

Embodiment 2

[0033] Weigh 3.8235 grams of vanadium trioxide and 2.2536 grams of lithium carbonate powder respectively, dissolve them in 300 mL of distilled water, then slowly add 12.06 grams of adipic acid powder, at 80 o Magnetically stirred at C, and evaporated to dryness at constant temperature (the molar ratio of vanadium trioxide: lithium carbonate: adipic acid is 1:1.22:2). Transfer the evaporated mixture to a corundum ark, move it into a tube furnace, and pass it into a protective atmosphere Ar / H 2(95:5 vol / vol%) mixed gas. First, let it stand under a protective atmosphere for 2 hours, then raise the temperature to 1000°C at a rate of 10°C / min, and keep it for 12 hours, and then cool down to room temperature at a rate of 10°C / min. A sample was taken out and ground in a mortar to obtain a black powder product. Do XRD, SEM and XPS analysis of the obtained products respectively, such as figure 1 (b), figure 2 (b), Figure 4 (b), indicating that the product is Li 1+x VO 2 , Ther...

Embodiment 3

[0036] Weigh 3.8235 grams of vanadium trioxide and 2.2167 grams of lithium carbonate powder respectively, dissolve in 300 mL of distilled water, then slowly add 12.06 grams of adipic acid powder, at 80 o Magnetically stirred at C, and evaporated to dryness at constant temperature (the molar ratio of vanadium trioxide: lithium carbonate: adipic acid is 1:1.18:2). Transfer the evaporated mixture to a corundum ark, move it into a tube furnace, and pass it into a protective atmosphere Ar / H 2 (95:5 vol / vol%) mixed gas. First stand in a protective atmosphere for 2 hours, then raise the temperature to 800°C at a rate of 5°C / min, and keep it for 24 hours, and then cool down to room temperature at a rate of 30°C / min. A sample was taken out and ground in a mortar to obtain a black powder product. Do XRD, SEM and XPS analysis of the obtained products respectively, such as figure 1 (c), figure 2 (c), Figure 4 (c), indicating that the product is Li 1+x VO 2 .

[0037] With the mo...

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Abstract

The invention relates to a novel lithium-rich material with a laminar rhombohedron structure, which is used as a negative electrode material of a lithium ion secondary cell, and a preparation method and application thereof, belonging to the technical fields of material synthesis and high-energy lithium ion cells. The general formula of the lithium-rich material is Li1+xVO2 (0.01<x<0.50). The lithium-rich material is characterized in that a discharge platform (about 0.1V) which is high in specific capacity and lower and relatively stable is brought by a high-density material, lithium ions are easily intercalated into or deintercalated from a laminar main material by virtue of excessive lithium in a crystal structure, and the safety performance of laminar intercalation into and deintercalation from the main body is improved. The product obtained by solid-phase sintering has high crystallinity and purity and narrow micro-scale particle size distribution. Chemical testing shows that the lithium-rich material prepared by the method has the maximal first discharge capacity of 406.8 mAh / g, and can be used as a lithium-intercalated negative electrode material to be applied to lithium ion cells. The method is simple in process, environmentally friendly, easy to industrialize and broad in application prospect, and meets practical production.

Description

technical field [0001] The invention relates to the negative electrode material technology for lithium-ion secondary batteries, especially the embeddable transition metal layered material (LiCoO 2 Structure) Li 1+x VO 2 and its preparation method. Background technique [0002] Lithium-ion batteries have the advantages of high potential, large specific energy, long cycle life, stable discharge performance, good safety, wide operating temperature range, and environmental protection. They are widely used in portable electronic devices, power tools, space technology, and defense industries, etc. Fields, especially in the application of electric vehicles and hybrid vehicles, are considered to be the most promising alternative energy sources to replace fossil fuels and reduce carbon emissions. At present, the widely used negative electrode material is graphitized carbon material, which has excellent performance in multiple charge-discharge cycles, but its lithium storage capac...

Claims

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Application Information

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IPC IPC(8): C01G31/00H01M4/485
CPCY02E60/122Y02E60/10
Inventor 不公告发明人
Owner GUANGZHOU HKUST FOK YING TUNG RES INST
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