Halogen anion intercalated hydrotalcite positive electrode material, preparation method thereof and halogen anion battery

A technology of anion intercalation and positive electrode materials, applied in the field of electrochemistry, can solve the problems of small volume specific capacity of chloride ion batteries, small particle size of hydrotalcite nanosheet materials, etc.

Inactive Publication Date: 2020-06-12
BEIJING UNIV OF CHEM TECH
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Problems solved by technology

However, the particle size of the chloride ion intercalated hydrotalcite nanosheet material prepared by this method is small, resulting in a small volume specific capacity of the chloride ion battery using this material as the positive electrode material.

Method used

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  • Halogen anion intercalated hydrotalcite positive electrode material, preparation method thereof and halogen anion battery
  • Halogen anion intercalated hydrotalcite positive electrode material, preparation method thereof and halogen anion battery
  • Halogen anion intercalated hydrotalcite positive electrode material, preparation method thereof and halogen anion battery

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preparation example Construction

[0039] The invention provides a method for preparing a halogen anion intercalation hydrotalcite positive electrode material, comprising the following steps:

[0040] Mix the first soluble metal salt, the second soluble metal salt, cyclohexamethylenetetramine and water to obtain a reaction solution; the metal ion M in the first soluble metal salt 1 Including Co 2+ 、Ni 2+ , Mg 2+ , Fe 2+ or Zn 2+; The metal ion M in the second soluble metal salt 2 Including Co 2+ , Fe 2+ , Fe 3+ 、Ti 3+ , Mn 3+ , V 3+ 、Al 3+ or Co 3+ ;

[0041] Under a protective atmosphere, the reaction solution is subjected to a co-precipitation reaction to obtain a precursor;

[0042] Mixing the precursor, liquid bromine and a nitrile solvent, performing a topological redox reaction, to obtain a bromide ion-intercalated hydrotalcite nanosheet material;

[0043] mixing the bromide ion-intercalated hydrotalcite nanosheet material with an aqueous solution of sodium fluoride, and performing a first ...

Embodiment 1

[0098] (1) Preparation of bromide ion intercalated hydrotalcite nanosheet material

[0099] NiCl 2 ·6H 2 O, CoCl 2 ·6H 2 O and cyclohexamethylenetetramine are dissolved in deionized water to obtain a reaction solution, in which NiCl 2 ·6H 2 The concentration of O is 0.005mol / L, CoCl 2 ·6H 2 The concentration of O is 0.01mol / L, and the concentration of hexamethylenetetramine is 0.4mol / L;

[0100] Under the protection of nitrogen, the reaction solution was reacted at 100°C for 8 hours and then centrifuged, the obtained solid was washed 3 times with water, and vacuum-dried at room temperature and vacuum degree of 0.1MPa for 24 hours to obtain Co 2 Ni(OH) 6 Precursor;

[0101] 0.2g Co 2 Ni(OH) 6 Disperse the precursor into 100mL of acetonitrile, add 0.5mol liquid bromine, react at room temperature and 1500rpm for 24 hours, then centrifuge, wash the resulting solid with absolute ethanol to remove excess liquid bromine, and dry it at room temperature for 24 hours to obtai...

Embodiment 2

[0109] (1) Preparation of fluoride ion intercalated hydrotalcite nanosheet material

[0110] Sodium fluoride was dissolved in CO-free 2 In deionized water, a sodium fluoride solution with a concentration of 2mol / L was prepared; at room temperature and 1500rpm, after CoNi-BrLDH and sodium fluoride solution prepared in Example 1 were reacted for 24h, centrifuged, the resulting solid was used Wash with deionized water until neutral, and dry at 60°C for 24 hours to obtain fluoride ion-intercalated hydrotalcite nanosheet material (abbreviated as CoNi-F LDH).

[0111] (2) Preparation of fluoride ion intercalated hydrotalcite nanosheet cathode material

[0112] Stir and mix polyvinylidene fluoride and N-methylpyrrolidone (mass ratio = 5:95) for more than 10 hours until the white polyvinylidene fluoride powder is dissolved in N-methylpyrrolidone to obtain a polyvinylidene fluoride solution;

[0113] Grind and mix CoNi-F LDH (40mg), acetylene black and polyvinylidene fluoride solutio...

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Abstract

The invention provides a halogen anion intercalated hydrotalcite positive electrode material, a preparation method thereof and a halogen anion battery, and belongs to the technical field of electrochemistry. The invention provides a preparation method of a halogen anion intercalated hydrotalcite positive electrode material. The method comprises the following steps: mixing two soluble metal salts,hexamethylenetetramine and water and then carrying out coprecipitation reaction; then oxidizing the fluorine ion intercalated hydrotalcite nanosheet material or the chloride ion intercalated hydrotalcite nanosheet material by utilizing liquid bromine to obtain a bromide ion intercalated hydrotalcite nanosheet material; preparing a fluorine ion intercalated hydrotalcite nanosheet material or a chloride ion intercalated hydrotalcite nanosheet material with a high-concentration sodium fluoride solution or a sodium chloride solution as a raw material through an acid exchange method; and preparingthe positive electrode material of the halogen anion battery by taking the halogen anion intercalated hydrotalcite nanosheet material as a raw material. The halogen anion intercalated hydrotalcite nanosheet material prepared by the method provided by the invention is regular hexagonal in morphology, large in particle size, high in crystallinity, large in capacity and good in cycling stability.

Description

technical field [0001] The invention relates to the technical field of electrochemistry, in particular to a halogen anion intercalation hydrotalcite positive electrode material, a preparation method thereof and a halogen anion battery. Background technique [0002] With the deteriorating environmental problems and energy crisis, the efficient use of electrochemical energy is considered to be an important way to achieve sustainable development. At present, the energy storage mechanism of most secondary battery systems is based on the reversible migration of lightweight metal cations between two electrodes, such as lithium-ion batteries, sodium-ion batteries, or potassium-ion batteries. Among them, lithium-ion batteries have a wide and mature market in various electronic equipment and new energy vehicles due to their high power density and long cycle life. [0003] In recent years, studies on halogen anion batteries using anions as mass transfer ions have been reported one af...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/00H01M4/58H01M10/05B82Y30/00B82Y40/00
CPCH01M4/582H01M10/05B82Y30/00B82Y40/00C01P2002/72C01P2004/03C01P2006/40C01P2004/61C01F7/785Y02E60/10
Inventor 韩景宾尹青罗佳能张健张硕潇
Owner BEIJING UNIV OF CHEM TECH
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