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Crystal material, preparation method and application thereof, positive electrode material of potassium ion battery and potassium ion battery comprising positive electrode material

A technology of crystalline materials and battery positive electrodes, which is applied in the direction of battery electrodes, secondary batteries, carboxylate preparation, etc., can solve the problems of high cost, complicated preparation process, and unsatisfactory performance, and achieve fewer steps, simple process, and good battery life. The effect of chemical properties

Active Publication Date: 2020-06-30
SHENZHEN INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at this stage, there are few studies on polyanionic compound cathode materials for potassium ion batteries, and the preparation process is complicated, the cost is high, and the performance is not ideal.

Method used

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  • Crystal material, preparation method and application thereof, positive electrode material of potassium ion battery and potassium ion battery comprising positive electrode material
  • Crystal material, preparation method and application thereof, positive electrode material of potassium ion battery and potassium ion battery comprising positive electrode material
  • Crystal material, preparation method and application thereof, positive electrode material of potassium ion battery and potassium ion battery comprising positive electrode material

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preparation example Construction

[0071] In the second aspect, in at least one embodiment, a method for preparing the above-mentioned crystal material is provided, comprising the following steps: uniformly mixing the potassium source, the M source, the oxalate source and a solvent, and then performing a solvothermal reaction to obtain the crystal material.

[0072] The above preparation method has simple process, few steps, convenient operation, low cost and is suitable for industrial production. Meanwhile, the prepared crystal material has stable structure, good electrochemical performance, high discharge voltage and high charge and discharge capacity.

[0073] Preferably, the molar ratio of M source, oxalate source, potassium source and solvent is 1:(1-3):(10-40):(100-400). The molar ratios above are typically but not limited to 1:1:10:100, 1:2:10:100, 1:3:10:100, 1:1:20:100, 1:1:30:100, 1:1:35:100, 1:1:40:100, 1:2:20:100, 1:2:30:100, 1:2:35:100, 1:2:40:100, 1: 3:20:100, 1:3:30:100, 1:3:35:100, 1:3:40:100, ...

Embodiment 1

[0200] A kind of crystalline material, its preparation method comprises: MnCl 2 0.6113g, K 2 CO 3 1.3425g, H 2 C 2 o 4 2(H 2 O) 1.347g, KCl 9.053g, H 2 O 17.5g was added to a 50mL hydrothermal synthesis reactor; the reactor containing the raw materials was heated at a constant temperature of 200°C for 48h and then cooled to room temperature to obtain K 2 Mn(C 2 o 4 ) 2 Crude product; take out the solid product in the reaction kettle and rinse it with absolute ethanol; add the rinsed solid product to 80 mL of glycerol, heat at 90°C for 6 hours to remove KCl impurities; filter and wash off the residual acrylic acid with absolute ethanol triol, dry to obtain the pure phase of K 2 Mn(C 2 o 4 ) 2 crystal particles.

[0201] like image 3 Shown is the XRD (X-ray diffraction, X-ray diffraction) collection of spectra of the crystalline material that embodiment 1 prepares, as can be seen from the collection of spectra, this crystalline material is the K of pure phase ...

Embodiment 14

[0209] A kind of potassium ion battery, adopts following method to prepare:

[0210] (a) Preparing the negative electrode of the battery: Roll metal potassium on aluminum foil (i.e., the negative electrode current collector) to form a foil, and cut the obtained potassium-aluminum composite foil into discs with a diameter of 12mm, and use it as the negative electrode of the battery;

[0211] (b) Prepare the diaphragm: cut the glass fiber film into discs with a diameter of 16mm and use it as a diaphragm for subsequent use;

[0212] (c) Preparation of electrolyte: Weigh 1.410g of potassium hexafluorophosphate and add it to a mixed solvent of 4.962g of ethylene carbonate and 3.874g of dimethyl carbonate, stir until potassium hexafluorophosphate is completely dissolved, stir well and use as electrolyte spare;

[0213] (d) Preparation of battery positive electrode: 0.8g K 2 Mn(C 2 o 4 ) 2 Crystal powder, 0.1g carbon black, and 0.1g polyvinylidene fluoride were added to 2ml nitr...

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Abstract

The invention relates to the field of secondary batteries, and particularly provides a crystal material, a preparation method and application thereof, a potassium ion battery positive electrode material and a potassium ion battery comprising the positive electrode material, wherein the molecular formula of the crystal material is K2M(C2O4)2, and M is at least one variable valence metal element. According to the invention, the crystal material belongs to heterogeneous isomorphism; the (C2O4)2-anion units in the crystal material are connected into a three-dimensional network structure through strong covalent bonds between C and O, and the anion units can play a role in supporting and stabilizing a crystal structure, so that the framework structure of the material is stable, potassium ions can be rapidly conducted in an open structural framework, and the ionic conductivity is high; and the crystal material can be used as a positive electrode active material of a potassium ion battery, sothat the potassium intercalation and potassium removal performances of the positive electrode active material containing the crystal material are greatly improved, and the oxidation-reduction potential and the charge-discharge capacity of the positive electrode active material are improved.

Description

technical field [0001] The invention relates to the field of secondary batteries, in particular to a crystal material, a preparation method and application thereof, a positive electrode material for a potassium ion battery, and a potassium ion battery including the positive electrode material. Background technique [0002] A secondary battery, also known as a rechargeable battery, is a battery that can be recharged and discharged multiple times. At present, the main secondary battery technologies include lead-acid batteries, nickel-chromium batteries, nickel-metal hydride batteries, and lithium-ion batteries. Lithium-ion batteries have a wide range of applications in the field of energy storage, but the natural abundance of lithium is low and unevenly distributed, making lithium-ion batteries costly. The abundance of potassium in the earth's crust is 1000 times that of lithium, and potassium and lithium belong to the same group of elements in the periodic table of elements....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C55/07C07C51/41H01M4/58H01M4/38H01M10/054
CPCC07C55/07C07C51/412H01M4/5825H01M4/381H01M10/054C07B2200/13Y02E60/10
Inventor 唐永炳吴南中姚文娇
Owner SHENZHEN INST OF ADVANCED TECH
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