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Preparation of carbon-coated vomoo by a sol-gel method 4 Lithium-ion battery anode material method

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor conductivity of transition metal oxides, reduced reversibility of electrode reactions, poor cycle stability, etc. Uniform and complete coating effect, enhanced conductivity, and easy control

Inactive Publication Date: 2021-07-16
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, transition metal oxides have poor electrical conductivity and are prone to pulverization on the surface, which will greatly reduce the reversibility of the electrode reaction, resulting in poor cycle stability.

Method used

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  • Preparation of carbon-coated vomoo by a sol-gel method <sub>4</sub> Lithium-ion battery anode material method
  • Preparation of carbon-coated vomoo by a sol-gel method <sub>4</sub> Lithium-ion battery anode material method
  • Preparation of carbon-coated vomoo by a sol-gel method <sub>4</sub> Lithium-ion battery anode material method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Will MoO 3 , V 2 o 3 , V 2 o 5 The raw materials are accurately weighed according to the molar ratio of 4:1:1, and V 2 o 3 Dissolve in distilled water at 50°C and stir magnetically at constant temperature for 0.5 hours, then add MoO 3 Stir magnetically for 0.5 h, then add V 2 o 5 Keep magnetic stirring at constant temperature at 60°C for 0.5 hours, and finally add MoO 3 , V 2 o 3 and V 2 o 5 The citric acid with 15% of the total mass of the three was evaporated to dryness at 80°C to form a uniform and stable colloid. The obtained colloid was dried and air-dried at 100°C, and the dried precursor was obtained after 12 hours; after the precursor was ground evenly Sinter at 400°C for 5 hours in a pure argon atmosphere, and after natural cooling, grind the powdered material; grind the powdered material again and compact it with a pressure of 7 MPa to make a small cylinder, put it into a tube furnace, and grind it in pure argon Sintering at 700°C for 6 hours in t...

Embodiment 2

[0035]Will MoO 3 , V 2 o 3 , V 2 o 5 The raw materials are accurately weighed according to the molar ratio of 4:1:1, and V 2 o 3 Dissolve in distilled water at 50°C and stir magnetically at constant temperature for 0.5 hours, then add MoO 3 Stir magnetically for 0.5 h, then add V 2 o 5 Keep magnetic stirring at constant temperature at 60°C for 0.5 hours, and finally add MoO 3 , V 2 o 3 and V 2 o 5 The sucrose with 10% of the total mass of the three was evaporated to dryness at 80°C to form a uniform and stable colloid. The obtained colloid was dried and air-dried at 100°C, and the dried precursor was obtained after 12 hours; after the precursor was ground evenly, the Sinter at 400°C for 5 hours in a pure argon atmosphere. After natural cooling, grind the powdered material; grind the powdered material again and compact it with a pressure of 5 MPa to make a small cylinder, put it into a tube furnace, and grind it in a pure argon atmosphere. Sintering treatment at 75...

Embodiment 3

[0037] Will MoO 3 、VO 2 The raw materials are accurately weighed according to the molar ratio of 1:1, and the MoO 3 Dissolve in distilled water at 50°C and stir magnetically at constant temperature for 0.5 hours, then add VO 2 Stir magnetically for 1 h and finally add MoO 3 and VO 2 The citric acid with 15% of the total mass of the two was evaporated to dryness at 80°C to form a uniform and stable colloid, and the obtained colloid was dried and air-dried at 100°C, and the dried precursor was obtained after 12 hours; after the precursor was ground evenly Sinter at 400°C for 5 hours in a pure argon atmosphere, cool naturally, and grind to obtain a powdered material; grind the powdered material again and compact it with a pressure of 10 MPa to make a small cylinder, put it into a tube furnace, and grind it in pure argon Sintering at 650°C for 9 hours in the atmosphere, then cooling down to 500°C at a cooling rate of 1°C / min, and finally cooling naturally to obtain carbon-coat...

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Abstract

The invention discloses a sol-gel method for preparing carbon-coated VOMoO 4 A method for lithium-ion battery negative electrode materials, the method comprising the following steps: adding molybdenum source and vanadium source into water, then adding water-soluble carbon material, heating, stirring, and drying to obtain a precursor; grinding and sintering the precursor, and cooling naturally Grind the powdered material; put the powdered material into a tube furnace, sinter in a protective atmosphere at 650-750°C for 6-12h, then cool down to 400-500°C and cool naturally to obtain carbon-coated VOMoO 4 Lithium-ion battery anode material. This method broke through the original high-temperature sealing preparation method, and successfully prepared carbon-coated VOMoO 4 . Adding carbon materials in the liquid phase state effectively prevents the agglomeration of material particles, and the particle size of the obtained materials becomes smaller; and carbon coating improves VOMoO 4 conductivity. The battery assembled with this material exhibits high charge-discharge capacity and good cycle performance.

Description

technical field [0001] The invention belongs to the technical field of preparation of lithium-ion battery materials, in particular to a sol-gel method for preparing carbon-coated VOMoO 4 A method for lithium-ion battery anode materials. Background technique [0002] Rechargeable lithium-ion batteries have the advantages of high energy density, high output voltage, good rate performance, long cycle life, wide battery operating temperature range, small self-discharge rate, light weight, environmental protection and pollution-free, etc., and are the most widely used mobile power devices , and gradually play an important role in the field of megawatt-level energy storage power stations such as electric vehicles, hybrid vehicles, and smart grids. However, as a traditional commercial lithium battery anode material, graphite cannot meet the safety requirements of large-scale equipment. In the case of high current and low voltage, the uneven deposition of lithium ions on the graph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525
CPCH01M4/366H01M4/483H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 董有忠赵龙赵彦明熊真敏俸靖杰黄春茂陈斯源黎小龙
Owner SOUTH CHINA UNIV OF TECH