Continuous electron ion quick conductive double-perovskite negative electrode material of potassium ion battery and preparation method for negative electrode material

A double perovskite and battery negative electrode technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of weak lithium ion diffusion ability, slow potassium ion migration speed, and material lattice transformation, so as to speed up the production of potassium ions. The effect of migration ability and redox reaction rate, reduction of electron migration resistance, and improvement of electronic conductivity

Inactive Publication Date: 2017-11-17
宁波吉电鑫新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is still very difficult to take into account the rate performance and cycle capacity retention performance of the material.
The main reasons are as follows: 1. When the redox reaction occurs, the electrode material should have fast lithium ion intercalation and deintercalation and electronic conduction, that is, it should have good electronic conductivity and ion conductivity at the same time. Many negative electrode materials have high However, it is an electronic insulator, and some negative electrode materials are good electronic conductors, but the diffusion capacity of lithium ions is weak, which greatly increases the polarization of the battery; 2. Many electrode materials are intercalated with lithium ions and There is a large volume change during the deintercalation process, resulting in the breakage of electrode material particles and the loss of effective electrode materials during the cycle. The large volume change also brings about the transformation of the material lattice during the charging and discharging process to produce a second phase. seriously affect the performance of the battery
3. Lithium battery negative electrode material with conversion reaction mechanism, the electronic insulation of the reaction product lithium compound seriously affects the reversibility of the material
ABOs 3 When the alloy reaction is carried out, the oxide can react with two metals, which may produce alloy solid solutions in various phases. Due to the interaction of bimetals, it may also produce electrochemical characteristics that are completely different from those of single metals. Therefore, ABOs 3 Type oxid

Method used

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  • Continuous electron ion quick conductive double-perovskite negative electrode material of potassium ion battery and preparation method for negative electrode material
  • Continuous electron ion quick conductive double-perovskite negative electrode material of potassium ion battery and preparation method for negative electrode material

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Experimental program
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Embodiment 1

[0022] Embodiment 1: Potassium nitrate, terbium nitrate hexahydrate, lithium nitrate, barium nitrate, zirconium nitrate pentahydrate, yttrium nitrate hexahydrate, iron nitrate nonahydrate, zinc nitrate hexahydrate, niobium oxalate according to stoichiometric formula KTb 0.5 Ba 0.2 Y 0.2 Li 0.1 Zr 0.8 Fe 0.1 Zn 0.1 NbO 6 Mix, add citric acid whose amount is 5 times of the amount of total metal ion substances, add water and stir evenly to form a total metal ion concentration of 1.0mol L -1 The initial aqueous solution; mix and dissolve 6g acrylamide / 100mL water volume of acrylamide and 1g N,N'-methylenebisacrylamide / 100mL water volume N,N'-methylenebisacrylamide and water, and the acrylamide in the solution The amount of the substance is 0.5 times the amount of the total metal ion substance in the initial aqueous solution; use a polytetrafluoroethylene stirring paddle to stir at a speed of 1500rpm for 5 minutes, then raise it to 75°C at a speed of 5°C / min and maintain the ...

Embodiment 2

[0023] Embodiment 2: Potassium nitrate, terbium nitrate hexahydrate, lithium nitrate, barium nitrate, zirconium nitrate pentahydrate, yttrium nitrate hexahydrate, ferric nitrate nonahydrate, zinc nitrate hexahydrate, niobium oxalate according to stoichiometric formula KTb 0.5 Ba 0.2 Y 0.2 Li 0.1 Zr 0.8 Fe 0.1 Zn 0.1 NbO 6 Mix, add citric acid whose amount is 8 times of the amount of total metal ion substances, add water and stir evenly to form a total metal ion concentration of 2.0mol L -1 The initial aqueous solution; mix and dissolve 6g acrylamide / 100mL water volume of acrylamide and 1g N,N'-methylenebisacrylamide / 100mL water volume N,N'-methylenebisacrylamide and water, and the acrylamide in the solution The amount of the substance is 0.7 times the amount of the total metal ion substance in the initial aqueous solution; use a polytetrafluoroethylene stirring paddle to stir at a speed of 1700rpm for 10 minutes, then raise it to 80°C at a speed of 8°C / min and maintain t...

Embodiment 3

[0024] Embodiment 3: Potassium nitrate, terbium nitrate hexahydrate, lithium nitrate, barium nitrate, zirconium nitrate pentahydrate, yttrium nitrate hexahydrate, ferric nitrate nonahydrate, zinc nitrate hexahydrate, niobium oxalate according to stoichiometric formula KTb 0.5 Ba 0.2 Y 0.2 Li 0.1 Zr 0.8 Fe 0.1 Zn 0.1 NbO 6 Mix, add citric acid whose amount is 10 times the amount of total metal ion substances, add water and stir evenly to form a total metal ion concentration of 2.5mol L -1 The initial aqueous solution; mix and dissolve 6g acrylamide / 100mL water volume of acrylamide and 1g N,N'-methylenebisacrylamide / 100mL water volume N,N'-methylenebisacrylamide and water, and the acrylamide in the solution The amount of the substance is 1.2 times the amount of the total metal ion substance in the initial aqueous solution; use a polytetrafluoroethylene stirring paddle to stir at a speed of 2000rpm for 15 minutes, then raise it to 85°C at a speed of 9°C / min and maintain the...

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Abstract

Disclosed are a continuous electron ion quick conductive double-perovskite negative electrode material of a potassium ion battery and a preparation method for the negative electrode material. The negative electrode material is characterized by comprising KTb<0.5>Ba<0.2>Y<0.2>Li<0.1>Zr<0.8>Fe<0.1>Zn<0.1>NbO<6>; in the preparation process, a continuous pore channel structure of gel is taken as a template to form a continuous porous appearance double-perovskite structured product with bonded particle parts; meanwhile, a continuous high-conductivity carbon film attached to the surface of the active material is formed through cracking under a protective gas; by virtue of such appearance, crystal boundary resistance can be lowered; a continuous electron transfer network is formed and electron transfer resistance is lowered; a contact area with an electrolyte is enlarged, and certain structural rigidity is achieved; furthermore, through co-occupation of K and Tb in A position and through partial Ba, Y and Li replacement in a Tb position, electron conductivity is improved; and by virtue of Fe and Zn doping in a B position, the perovskite structural stability is improved, and the high-performance negative electrode material of the potassium ion battery can be finally formed.

Description

technical field [0001] The invention relates to the technical field of a method for manufacturing an anode material of a potassium ion battery. Background technique [0002] Lithium-ion secondary batteries have the absolute advantages of high volume, weight-to-energy ratio, high voltage, low self-discharge rate, no memory effect, long cycle life, and high power density. Currently, the global mobile power market has an annual share of more than 30 billion US dollars and Gradually grow at a rate of more than 10%. Especially in recent years, with the gradual depletion of fossil energy, new energy sources such as solar energy, wind energy, and biomass energy have gradually become alternatives to traditional energy sources. Among them, wind energy and solar energy are intermittent, and a large amount of energy is used simultaneously to meet the needs of continuous power supply. Energy storage batteries; urban air quality problems caused by automobile exhaust are becoming more an...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054
CPCH01M4/366H01M4/5825H01M4/625H01M4/626H01M4/628H01M10/054Y02E60/10
Inventor 水淼
Owner 宁波吉电鑫新材料科技有限公司
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