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Preparation method of nitride-coated composite material, composite material and lithium ion battery

A technology of composite materials and nitrides, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of high requirements for coating materials, expensive oxides, and poor conductivity of oxides

Inactive Publication Date: 2014-10-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the oxide coating technology is complicated (atomic layer deposition technology ALD is generally used), the conductivity of oxides is poor, and some oxides are expensive (such as RuO 2 )
[0006] In addition, nitride coating is rarely used in the prior art. In 201310052297.1, a method for preparing a nitride-coated lithium-rich cathode material was disclosed. The cladding material has high requirements, only limited to xLi 2 MnO 3 ·(1-x)LiMO 2 (M=Mn, Ni, Co, Ni 0.5 mn 0.5 , Cr, Fe), not suitable for single oxide coating, and its improvement effect on electrochemical performance is not obvious

Method used

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  • Preparation method of nitride-coated composite material, composite material and lithium ion battery
  • Preparation method of nitride-coated composite material, composite material and lithium ion battery
  • Preparation method of nitride-coated composite material, composite material and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0051] Commercialized MoO 3 The powder is evenly spread in the crucible, and the crucible is placed in the center of the heating zone of the quartz tube of the tube furnace; the quartz tube is evacuated and filled with Ar gas, and the "vacuumizing-inflating" operation is repeated three times; Pure NH was introduced into the quartz tube 3 Gas, adjust the gas flow to 500sccm; feed NH 3 After 20 minutes, the quartz tube was heated with a heating rate of 20°C / min, a holding temperature of 500°C, and a holding time of 40 minutes; immediately after the heating reaction, the cover of the tube furnace was opened to cool the sample in the air. Mo can be obtained by such simple annealing 2 N-coated MoO 3 Material.

[0052] Preparation of electrode materials: Mo will be obtained by such a simple annealing 2 N-coated MoO 3 Materials, acetylene black and polyvinylidene fluoride (PVDF) adhesive are mixed uniformly according to the weight ratio of 7:2:1, and N-methylpyrrolidone (NMP) i...

Embodiment 2

[0055] Commercialized MoO 3 The powder is evenly spread in the crucible, and the crucible is placed in the center of the heating zone of the quartz tube of the tube furnace; the quartz tube is evacuated and filled with Ar gas, and the operation of "vacuumizing-inflating" is repeated three times; Gas adjusted to H 2 / Ar gas (the volume ratio of the two is 1:9), the gas flow rate is 800sccm, the quartz tube is heated, the heating rate is 20°C / min, the holding temperature is 600°C, and the holding time is 20min; 2 / Ar gas is replaced by pure NH 3 Gas, adjust the gas flow rate to 500 sccm, lower the temperature to 500 ° C, and keep it warm for 20 minutes; immediately open the tube furnace cover after the heating reaction, and let the sample cool in the air. Mo can be obtained by such simple annealing 2 N-coated nano-hollow MoO 2 . The same method as in Example 1 was used to prepare a lithium-ion battery and perform electrochemical performance tests.

Embodiment 3

[0057] Commercialize MoO 3 The powder is dissolved in a certain amount of 30wt% H 2 o 2 , stir evenly to obtain a yellow transparent solution, add an appropriate amount of deionized water, pour the solution into a reaction kettle with a polytetrafluoroethylene liner, carry out heating reaction, wash the product with deionized water and absolute ethanol several times, and dry it That is, single crystal MoO 3 nanoribbons; the single crystal MoO prepared above 3 Nanobelts were heated and reacted in a tube furnace according to the experimental conditions in Example 1, the heating temperature was adjusted to 600°C, the heating time was 30min, and other synthesis conditions remained unchanged to prepare Mo 2 N-coated single crystal MoO 3 Nanobelt materials, and electrochemical performance tests.

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Abstract

The invention provides a preparation method of a nitride-coated composite material, a composite material and a lithium ion battery. The preparation method comprises the steps of introducing NH3 to a transition metal oxide by the flow rate of 100-1000sccm in a protective atmosphere, heating at the temperature rise rate of 10-25 DEG C per minute in the pure NH3 atmosphere until the temperature is in the range from 400 to 650 DEG C, preserving heat for 10-100 minutes, and then quickly cooling to room temperature, thereby obtaining the nitride-coated composite material. The nitride-coated composite material prepared by controlling the flow rate of the introduced ammonia gas, the heat preservation time, the heat preservation temperature and the like is capable of increasing the maximum specific capacity and the capacity retention ratio of the electrode material and improving the cycling stability and the rate capability of the battery.

Description

technical field [0001] The invention belongs to the field of material synthesis and lithium-ion batteries, and in particular relates to a preparation method of a nitride-coated composite material, the composite material and a lithium-ion battery. Background technique [0002] With the extensive use of fossil energy, my country's energy situation is very severe. Facing the challenges of energy issues, it is very important to find an energy storage device with high energy density and good safety and stability. As a new type of energy storage device, lithium-ion batteries have the advantages of small size, light weight, high energy density, high working voltage, long cycle life, and environmental friendliness. Since the 1990s, they have been the focus of governments and researchers around the world. focus on. At present, the application of lithium-ion batteries covers all aspects of people's lives, such as power grid peak shaving, power vehicles, communication equipment, house...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M10/0525
CPCY02E60/122H01M4/366H01M4/48H01M10/0525Y02E60/10
Inventor 刘军唐莎莎季文海唐楷为高书宁杨林钰卢亚堃闵杰
Owner CENT SOUTH UNIV