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A kind of synthetic method of lithium vanadate lithium ion battery cathode material

A material technology of lithium vanadate, lithium ion battery, applied in battery electrodes, vanadium compounds, secondary batteries, etc., to achieve the effects of easy interface correction, good rate performance and cycle performance, and precise control of atomic ratio

Active Publication Date: 2019-05-17
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the preparation methods of lithium vanadate include solid-phase method, liquid-phase method, etc. In practical application, the capacity of lithium vanadate is about 200mAh / g, and the atomic deposition technology is used to deposit V on the surface of lithium source. 2 o 5 After that, lithium vanadate prepared after pre-calcination and calcination has not been reported at home and abroad.

Method used

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  • A kind of synthetic method of lithium vanadate lithium ion battery cathode material
  • A kind of synthetic method of lithium vanadate lithium ion battery cathode material

Examples

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Effect test

Embodiment 1

[0024] (1) Pretreatment: Put the lithium hydroxide material in an oven and bake at 80°C for 8 hours, take it out and put it in a dry reagent bottle to seal it for later use;

[0025] (2) Lithium source active site control: put the dried lithium source material in step (1) into an atomic layer deposition (ALD) chamber at a temperature of 120 ° C, and then use ethanol as a pulsed gas source to the atomic layer deposition chamber After 30s in vivo, use high-purity nitrogen to blow off the excess pulse gas source to obtain a surface-passivated lithium hydroxide substrate;

[0026] (3) Raise the temperature of the ALD cavity containing the passivated lithium hydroxide substrate in step (2) to 200°C, and heat the ammonium metavanadate to its vapor pressure temperature of 145.8°C as the pulse gas source, and the pulse time is 50s after , purging with high-purity nitrogen for 100s; then using oxygen as a pulse gas source, the pulse time is 30s, and then purging with high-purity nitrog...

Embodiment 2

[0033] (1) Pretreatment: Put the lithium acetate material in an oven and bake at 100°C for 10 hours, take it out and put it in a dry reagent bottle to seal it for later use;

[0034] (2) Lithium source active site control: put the dried lithium acetate material in step (1) into an atomic layer deposition (ALD) chamber at a temperature of 140°C; use formaldehyde as a pulse gas source for 50s, and then use high-purity nitrogen gas Blow off the excess pulse gas source to obtain a surface-passivated lithium acetate substrate;

[0035] (3) Raise the temperature of the ALD cavity carrying the passivated lithium acetate substrate in step (2) to 200°C, heat the ammonium metavanadate to its vapor pressure temperature of 145.8°C, use it as a pulse gas source, pulse for 80s, and use high Pure nitrogen is purged for 100s; then oxygen is used as the pulse gas source, and after the pulse is 50s, it is purged with high-purity nitrogen for 100s to obtain a cycle of uniform deposition of vanad...

Embodiment 3

[0040] (1) Pretreatment: Put the lithium hydroxide material in an oven and bake at 90°C for 10 hours, take it out and put it into a dry reagent bottle to seal it for later use;

[0041] (2) Lithium source active site control: put the dried lithium source material in step (1) into the atomic layer deposition (ALD) chamber, heat the chamber temperature to 160°C, use ethanol as the pulse gas source, and use high Pure nitrogen is used as the carrier gas, and the pulse time of the pulse gas source is 30s, and then the excess pulse gas source is blown off with high-purity nitrogen gas to obtain a surface-passivated lithium hydroxide substrate;

[0042] (3) Raise the temperature of the ALD chamber containing the passivated lithium hydroxide substrate in step (2) to 200°C, and heat the ammonium metavanadate to its vapor pressure temperature of 145.8°C, as a pulse gas source, and the pulse time is 50s 1. Purging with high-purity nitrogen for 100s; then using oxygen as a pulse gas sourc...

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Abstract

The invention discloses a method for synthesizing a lithium vanadate cathode material of a lithium ion battery. The method comprises the following steps of drying a lithium source material, and using an atom deposition technique to obtain surface-passivated lithium source substrate; cyclically deposing vanadium pentoxide reacted by ammonium metavanadate and oxide onto the passivated lithium source substrate, so as to obtain a precursor A; pre-sintering the precursor A, washing, sucking and filtering, and drying, so as to obtain a precursor B; finally, sintering a precursor C under the protection atmosphere, so as to obtain the lithium vanadate cathode material. The method has the characteristics that the precursor is obtained by the atom deposition technique, the lithium vanadate cathode material is sintered by the high-temperature solid phase method, the crystallizing degree is high, and the structure is stable; the prepared lithium vanadate cathode material has good rate capability and cyclic property.

Description

technical field [0001] The invention belongs to the field of lithium battery materials, and in particular relates to a method for synthesizing lithium vanadate, a cathode material of a lithium ion battery. Background technique [0002] At present, with the rapid development of transportation, communication and information industrialization, products such as electric vehicles, notebook computers and mobile communication tools have put forward higher and very urgent requirements for the development of new chemical power sources. Lithium-ion battery, as a new type of green storage battery, has formed a lithium-ion battery at home and abroad due to its advantages such as high working voltage, light weight, large specific energy, low self-discharge rate, long cycle life, no memory effect, and no environmental pollution. Ion battery research upsurge. [0003] The layered compound LiV 3 o 8 It has excellent lithium intercalation ability, and it has the advantages of high specifi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M10/0525C01G31/00C23C16/40C23C16/455
CPCC01G31/00C01P2004/03C01P2004/61C23C16/405C23C16/45525H01M4/5825H01M10/0525Y02E60/10
Inventor 沈中宇刘兴亮王春雷汪涛
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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