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Open framework fluoride positive electrode material for potassium/sodium ion battery, and preparation method thereof

A technology for sodium ion batteries and cathode materials, which is applied in battery electrodes, secondary batteries, electrochemical generators, etc., can solve problems such as unfavorable cathode materials for sodium ion batteries, affecting cycle stability, etc., to improve the slow diffusion rate and increase the Cycling Stability and Rate Capability, Effect of Mitigating Lattice Volume Changes

Active Publication Date: 2017-08-29
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since these open frame phase structures contain crystal water, the detachment of crystal water may degrade the electrolyte and affect the cycle stability, so it is not conducive to its large-scale application as a cathode material for sodium-ion batteries.

Method used

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  • Open framework fluoride positive electrode material for potassium/sodium ion battery, and preparation method thereof
  • Open framework fluoride positive electrode material for potassium/sodium ion battery, and preparation method thereof
  • Open framework fluoride positive electrode material for potassium/sodium ion battery, and preparation method thereof

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preparation example Construction

[0038] K x FeF 3 Mix the powder and conductive carbon black evenly, add a certain amount of solvent, and ball mill in an inert gas environment, then wash, centrifuge, and dry to obtain a composite positive electrode material based on the open-frame fluoride positive electrode material for potassium ion batteries. As long as the solvent meets the non-alcoholic anhydrous organic solvent, such as N-methylpyrrolidone, the quality of the solvent is K x FeF 3 400%-600% of the total mass of powder and conductive carbon black, preferably 500%. Wherein, the ball milling is performed at a rotating speed of 500-800r / min for 5-10 hours. As an example, each cycle of the ball milling reaction runs for 5-10min, stops for 15min, and has a total of 60 cycles. After the ball milling reaction finishes, the tank is cooled to room temperature and the tank is opened, and the sample is taken out with N-methylpyrrolidone (NMP) as a solvent, and washed by centrifugation. The powder is then dried. ...

Embodiment 1

[0045] 1) Take KF, FeF 2 , FeF 3 0.33H 2 O is the precursor to prepare K 0.6 FeF 3 Cathode material:

[0046] Weigh 0.291g KF and 0.469g FeF according to the molar ratio of 1:1:1 2 , 0.594g FeF 3 0.33H 2 O. Grind the three materials in a mortar for 1 hour until well mixed. The mixed material was then pressed into a disc with a diameter of 10 mm under a pressure of 10 MPa. The pressed disc was put into a vacuum oven at 80°C to remove water, and after 12 hours, the disc was taken out and put into a glove box. The pressed discs were sealed into a stainless steel autoclave in an argon atmosphere glove box. The reaction kettle was taken out from the glove box and put into a tube furnace, and high-purity argon was introduced into the tube furnace to remove the air in the furnace tube. After ventilating for 2 hours, the reactor was heated under a specific program: the heating rate was 5°C / min, heated to 300°C and kept for 5 hours, and naturally cooled to room temperature a...

Embodiment 2

[0052] 1) Take KF, FeF 2 , FeF 3 ·3H 2 O is the precursor to prepare K 0.5 FeF 3 Cathode material:

[0053] Weigh 0.291g KF and 0.469g FeF according to the molar ratio of 1:1:1 2 , 0.834g FeF 3 ·3H 2 O. The three fluoride precursors were ground in a mortar for 1 h until well mixed. The mixed material was then pressed into a disc with a diameter of 10 mm under a pressure of 12 MPa. The pressed disc was put into a vacuum oven at 80°C to remove water, and after 12 hours, the disc was taken out and put into a glove box. The pressed discs were sealed into a stainless steel autoclave in an argon atmosphere glove box. The reaction kettle was taken out from the glove box and put into a tube furnace, and high-purity argon was introduced into the tube furnace to remove the air in the furnace tube. After ventilating for 2 hours, the reactor was heated under a specific program: the heating rate was 5°C / min, heated to 350°C and kept for 8 hours, and naturally cooled to room temp...

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Abstract

The present invention relates to an open framework fluoride positive electrode material for a potassium / sodium ion battery, wherein the open framework fluoride positive electrode material is MxFeF3, M is K or Na, x is more than 0 and is less than or equal to 1, and MxFeF3 is a tetragonal tungsten bronze structure and has an open tunnel structure. According to the present invention, the open framework fluoride adopts potassium ions or sodium ions as the channel supporting filler, and the applications of a class of the tetragonal tungsten bronze structures in the energy storage materials are firstly achieved; and by using the migration ion filler to replace the electrically neutral crystal water molecules, the occupation of the crystal water on the open framework channel is avoided, and the reduction of the valence of the transition metal is achieved so as to easily combine with the non-sodium or non-potassium negative electrode.

Description

technical field [0001] The invention belongs to the technical field of new energy, and in particular relates to an open-frame fluoride cathode material for a sodium / potassium ion battery and a preparation method thereof. Background technique [0002] The rapid development of the transportation market and the industrial energy storage market has resulted in a continuous increase in the demand for large-scale secondary batteries. Under the trend of vigorously developing "green" technology, lithium-ion batteries have been widely used in portable electronic products such as mobile phones and notebook computers, and are considered to be one of the best choices for electric vehicles. However, the limited reserves and uneven distribution of lithium resources have recently caused a sharp rise in its price, which severely limits the application of lithium-ion batteries in vehicles and large-scale energy storage systems. Therefore, it is of great strategic significance to find new se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/36H01M4/58H01M4/1397H01M4/583
CPCH01M4/1397H01M4/366H01M4/582H01M4/583H01M10/36Y02E60/10
Inventor 李驰麟韩延林胡九林
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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