Lithium-vanadium oxide over-long nano wire and preparation method and application thereof

Abstract

The invention relates to a lithium-vanadium oxide over-long nano wire and a preparation method thereof. The lithium-vanadium oxide over-long nano wire can be taken as an anode active material for a high-power long-service-life lithium ion battery, is 200-300 microns in length, and is 100-200 nanometers in diameter. The lithium-vanadium oxide over-long nano wire is obtained in a simple calcining way. When the lithium-vanadium oxide over-long nano wire is taken as an anode active material for the lithium ion battery, the discharge capacity can still be up to 120mAh / g after circulating at the current density of 2,000mA / g for 600 times, and the capacity attenuation ratio per time is only 0.022 percent. As proved by a result, the lithium-vanadium oxide over-long nano wire has excellent high magnification characteristic, and is a potential application material for the high-power long-service-life lithium ion battery. In a simple hydro-thermal method adopted for preparing a precursor H2V3O8 over-long nano wire, the shape and size of a material can be controlled by changing the reactant concentration, reaction temperature and time, and the prepared material has high purity and high dispersivity.

Description

technical field

[0001] The invention belongs to the technical field of nanometer materials and electrochemistry, and in particular relates to a lithium vanadium oxide superlong nanowire and a preparation method thereof, which can be used as a high-power and long-life lithium-ion battery cathode active material. Background technique

[0002] Lithium-ion batteries, as a kind of green energy, have been widely used in portable devices such as mobile phones and notebook computers. Although the energy density of lithium-ion batteries is high, the low diffusion rate of lithium ions and electrons leads to poor rate characteristics and low power density. Poor rate characteristics mean that the battery requires a long charging time, which limits its further development in portable devices; and low power density limits the application of lithium-ion batteries in hybrid vehicles and pure electric vehicles. Therefore, the study of large-capacity, high-power, long-life, and low-cost lith...

Examples

Embodiment 1

[0037] Lithium vanadium oxide Li (1+x) V 3 o 8 (x=0) the preparation method of ultra-long nanowire, it comprises the steps:

[0038] 1) Weigh 20 g V 2 o 5 Put the powder into a ceramic crucible and place it in a muffle furnace, raise the temperature to 800 °C, and keep it warm for 0.5 hours to fully melt;

[0039] 2) will melt V 2 o 5 Quickly pour 2 L of deionized water at room temperature to quench, heat the obtained reddish-brown liquid on an electric furnace until it boils and keep stirring for 1 hour, after cooling, suction filter three times to remove residual solids, and let the filtrate stand for seven days to obtain a stable deep red color V 2 o 5 For sol, take three samples of 10 mL sol, weigh the mass and calculate the sol concentration after drying, and take the average value as V 2 o 5 Sol concentration, spare;

[0040] 3) Measure 1.3 mmol of V 2 o 5 sol and diluted in deionized water to obtain a 40 mL solution, according to V 2 o 5 The molar ratio ...

Embodiment 2

[0051] Lithium vanadium oxide Li (1+x) V 3 o 8 (x=0.1) the preparation method of superlong nanowire, it comprises the steps:

[0052] 1) Weigh 20 g V 2 o 5 Put the powder into a ceramic crucible and place it in a muffle furnace, raise the temperature to 800 °C, and keep it warm for 0.5 hours to fully melt;

[0053] 2) will melt V 2 o 5 Pour quickly into 2 L of deionized water at room temperature to quench, heat the obtained reddish-brown liquid on an electric furnace until boiling and keep stirring for 1 hour, after cooling, suction filter three times to remove residual solids, and leave the filtrate for seven days to obtain a stable dark red color V 2 o 5 For sol, take three samples of 10 mL sol, weigh the mass and calculate the sol concentration after drying, and take the average value as V 2 o 5 Sol concentration, spare;

[0054] 3) Measure 1.5 mmol of V 2 o 5 sol and diluted in deionized water to obtain a 40 mL solution, according to V 2 o 5 The molar ratio...

Embodiment 3

[0063] Lithium vanadium oxide Li (1+x) V 3 o 8 (x=0.2) the preparation method of ultra-long nanowire, it comprises the steps:

[0064] 1) Weigh 20 g V 2 o 5 Put the powder into a ceramic crucible and place it in a muffle furnace, raise the temperature to 800 °C, and keep it warm for 0.5 hours to fully melt;

[0065] 2) will melt V 2 o 5 Pour quickly into 2 L of deionized water at room temperature to quench, heat the obtained reddish-brown liquid on an electric furnace until boiling and keep stirring for 1 hour, after cooling, suction filter three times to remove residual solids, and leave the filtrate for seven days to obtain a stable dark red color V 2 o 5 For sol, take three samples of 10 mL sol, weigh the mass and calculate the sol concentration after drying, and take the average value as V 2 o 5 Sol concentration, spare;

[0066] 3) Measure 1.1 mmol of V 2 o 5 sol and diluted in deionized water to obtain a 40 mL solution, according to V 2 o 5 The molar rati...

technical field

[0001] The invention belongs to the technical field of nanometer materials and electrochemistry, and in particular relates to a lithium vanadium oxide superlong nanowire and a preparation method thereof, which can be used as a high-power and long-life lithium-ion battery cathode active material. Background technique

[0002] Lithium-ion batteries, as a kind of green energy, have been widely used in portable devices such as mobile phones and notebook computers. Although the energy density of lithium-ion batteries is high, the low diffusion rate of lithium ions and electrons leads to poor rate characteristics and low power density. Poor rate characteristics mean that the battery requires a long charging time, which limits its further development in portable devices; and low power density limits the application of lithium-ion batteries in hybrid vehicles and pure electric vehicles. Therefore, the study of large-capacity, high-power, long-life, and low-cost lith...

Examples

Embodiment 1

[0037] Lithium vanadium oxide Li (1+x) V 3 o 8 (x=0) the preparation method of ultra-long nanowire, it comprises the steps:

[0038] 1) Weigh 20 g V 2 o 5 Put the powder into a ceramic crucible and place it in a muffle furnace, raise the temperature to 800 °C, and keep it warm for 0.5 hours to fully melt;

[0039] 2) will melt V 2 o 5 Quickly pour 2 L of deionized water at room temperature to quench, heat the obtained reddish-brown liquid on an electric furnace until it boils and keep stirring for 1 hour, after cooling, suction filter three times to remove residual solids, and let the filtrate stand for seven days to obtain a stable deep red color V 2 o 5 For sol, take three samples of 10 mL sol, weigh the mass and calculate the sol concentration after drying, and take the average value as V 2 o 5 Sol concentration, spare;

[0040] 3) Measure 1.3 mmol of V 2 o 5 sol and diluted in deionized water to obtain a 40 mL solution, according to V 2 o 5 The molar ratio ...

Embodiment 2

[0051] Lithium vanadium oxide Li (1+x) V 3 o 8 (x=0.1) the preparation method of superlong nanowire, it comprises the steps:

[0052] 1) Weigh 20 g V 2 o 5 Put the powder into a ceramic crucible and place it in a muffle furnace, raise the temperature to 800 °C, and keep it warm for 0.5 hours to fully melt;

[0053] 2) will melt V 2 o 5 Pour quickly into 2 L of deionized water at room temperature to quench, heat the obtained reddish-brown liquid on an electric furnace until boiling and keep stirring for 1 hour, after cooling, suction filter three times to remove residual solids, and leave the filtrate for seven days to obtain a stable dark red color V 2 o 5 For sol, take three samples of 10 mL sol, weigh the mass and calculate the sol concentration after drying, and take the average value as V 2 o 5 Sol concentration, spare;

[0054] 3) Measure 1.5 mmol of V 2 o 5 sol and diluted in deionized water to obtain a 40 mL solution, according to V 2 o 5 The molar ratio...

Embodiment 3

[0063] Lithium vanadium oxide Li (1+x) V 3 o 8 (x=0.2) the preparation method of ultra-long nanowire, it comprises the steps:

[0064] 1) Weigh 20 g V 2 o 5 Put the powder into a ceramic crucible and place it in a muffle furnace, raise the temperature to 800 °C, and keep it warm for 0.5 hours to fully melt;

[0065] 2) will melt V 2 o 5 Pour quickly into 2 L of deionized water at room temperature to quench, heat the obtained reddish-brown liquid on an electric furnace until boiling and keep stirring for 1 hour, after cooling, suction filter three times to remove residual solids, and leave the filtrate for seven days to obtain a stable dark red color V 2 o 5 For sol, take three samples of 10 mL sol, weigh the mass and calculate the sol concentration after drying, and take the average value as V 2 o 5 Sol concentration, spare;

[0066] 3) Measure 1.1 mmol of V 2 o 5 sol and diluted in deionized water to obtain a 40 mL solution, according to V 2 o 5 The molar rati...

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