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Lithium/sodium ion battery negative electrode material trinickel tetraselenide/carbon composite material and preparation method thereof

A technology for sodium ion batteries and composite materials, which is applied in the field of preparation of battery negative electrode materials, can solve the problems of reversible deintercalation of sodium ions, and achieve high stability, simple preparation methods, and high first-time coulombic efficiency.

Active Publication Date: 2020-01-10
LONGYAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the ionic radius of sodium ions is larger than that of lithium ions, some common lithium battery negative electrode materials cannot meet the reversible deintercalation of sodium ions.

Method used

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  • Lithium/sodium ion battery negative electrode material trinickel tetraselenide/carbon composite material and preparation method thereof
  • Lithium/sodium ion battery negative electrode material trinickel tetraselenide/carbon composite material and preparation method thereof
  • Lithium/sodium ion battery negative electrode material trinickel tetraselenide/carbon composite material and preparation method thereof

Examples

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preparation example Construction

[0031] A kind of lithium / sodium ion battery anode material Ni 3 Se 4 The preparation method of / C composite material, comprises the following steps:

[0032] 1) Put nickel chloride hexahydrate, citric acid and urea together in a mixture of ethanol and distilled water to obtain a mixed solution, heat and stir the mixed solution in a water bath to obtain a green gel, and place the gel in an oven to dry , to obtain the nanosheet nickel salt precursor;

[0033] The mass ratio of described nickel chloride hexahydrate, citric acid and urea is 0.1-0.6: 0.5-2: 3-8;

[0034] 2) Put the nickel salt precursor in a tube furnace, heat up to 200-400°C at a heating rate of 3-10°C / min in a nitrogen environment, and heat it for 1-3 hours to remove organic matter;

[0035]3) Heat the product obtained in step 2) to 700-900°C at a heating rate of 3-10°C / min in a nitrogen environment and keep it warm for 4-6h for heat treatment, and then cool to room temperature to obtain a nickel / carbon compos...

Embodiment 1

[0044] A kind of Ni 3 Se 4 The preparation method of / C composite material, comprises the following steps:

[0045] 1) Put 0.4g of nickel chloride, 1g of citric acid and 5g of urea in a beaker, add a mixture of 150ml of ethanol and 50ml of distilled water into the beaker, and heat and stir the resulting mixed solution in a water bath at 80°C until a green condensation is obtained. Gel, the wet gel is placed in an oven to dry, and dried at 80 ° C for 12 hours to obtain a nano-sheet nickel salt precursor;

[0046] 2) Put the nano-flaky nickel salt precursor into the crucible, raise the temperature to 300°C at a heating rate of 5°C / min in a nitrogen atmosphere, and perform heat treatment at 300°C for 2 hours to remove organic matter;

[0047] 3) The product obtained in step 2) is subjected to high-temperature carbonization treatment, and the temperature is raised to 700°C at a heating rate of 5°C / min in a nitrogen environment, and heat treatment is performed at 700°C for 5 hour...

Embodiment 2

[0055] A kind of Ni 3 Se 4 The preparation method of nanometer material, comprises the following steps:

[0056] 1) Put 0.6g of nickel chloride, 1g of citric acid and 5g of urea in a beaker, add a mixture of 150ml of ethanol and 50ml of distilled water into the beaker, heat and stir the resulting solution in a water bath at 80°C until a green gel is obtained , place the wet gel in an oven to dry, and dry at 80° C. for 12 hours to obtain a nano-sheet nickel salt precursor;

[0057] 2) Then put the nano-flaky nickel salt precursor into the crucible, raise the temperature to 300°C at a heating rate of 5°C / min under nitrogen atmosphere, and perform heat treatment at 300°C for 2 hours to remove organic matter;

[0058] 3) Carry out high-temperature carbonization treatment on the product obtained in step 2), raise the temperature to 700°C at a heating rate of 5°C / min under nitrogen atmosphere, conduct heat treatment at 700°C for 5 hours, and cool to room temperature , the powder ...

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Abstract

The invention discloses a lithium / sodium ion battery negative electrode material trinickel tetraselenide / carbon composite material and a preparation method thereof. The method comprises the followingsteps: 1) putting nickel chloride hexahydrate, citric acid and urea into a mixed solution of ethanol and water, heating and stirring in a water bath, and drying to obtain a nickel salt precursor; 2) firstly removing organic matters from the nickel salt precursor, and then performing high-temperature carbonization treatment to obtain a nickel / carbon composite material; 3) grinding the nickel / carboncomposite material into nickel / carbon powder, putting the nickel / carbon powder into water, performing ultrasonic dispersion to obtain a solution A, adding selenium powder into water, performing magnetic stirring, and adding sodium borohydride to obtain a solution B; and 4) adding the solution B into the solution A, carrying out hydrothermal reaction, and then cooling, filtering, washing and drying to obtain the Ni3Se4 / C composite material. The lithium batteries and the sodium batteries assembled by utilizing the composite material can simultaneously realize high capacity, high rate, high initial coulombic efficiency and high stability.

Description

technical field [0001] The invention relates to a preparation method of a battery negative electrode material, in particular to a lithium / sodium ion battery negative electrode material nickel tetraselenide / carbon composite material and a preparation method thereof. Background technique [0002] With the reduction of fossil fuels and climate change, sustainable development and environmental protection have become major issues for people, and more and more researchers are actively developing efficient and clean new energy sources. Since Sony Corporation of Japan successfully developed lithium-ion batteries in the early 1990s, lithium-ion batteries have become the main force in the secondary energy market due to their light weight, high operating voltage, high energy density, and long cycle life, and are widely used In portable electronic products, electric vehicles, electric vehicles and other energy storage fields. The rise of emerging technology industries such as electric ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/04C01B32/05H01M4/36H01M4/58H01M4/62H01M10/0525H01M10/054
CPCC01B19/007C01B32/05H01M4/362H01M4/581H01M4/625H01M10/0525H01M10/054C01P2004/80C01P2002/72C01P2004/03C01P2004/04C01P2004/51Y02E60/10
Inventor 赵陈浩沈圳胡志彪
Owner LONGYAN UNIV
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