Potassium titanyl phosphate negative electrode material for potassium ion secondary battery

A technology of potassium titanyl phosphate and secondary battery, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problem of small overpotential polarization charging and discharging Coulomb efficiency, high charging and discharging platform potential, unstable charging and discharging platform, etc. problem, to achieve the effects of excellent cycle and rate performance, stable charge-discharge potential platform, and high safety

Inactive Publication Date: 2018-11-23
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems existing in the negative electrode materials of potassium ion batteries; to solve the problems of low charge-discharge coulombic efficiency, high potential of charge-discharge platform or no stable charge-discharge platform and serious excessive Potential polarization and other issues; developed a potassium titanyl phosphate anode material for potassium ion secondary batteries, which has high safety, stable charge and discharge potential platform, small overpotential polarization and high charge and discharge Coulomb Efficiency and other advantages

Method used

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  • Potassium titanyl phosphate negative electrode material for potassium ion secondary battery
  • Potassium titanyl phosphate negative electrode material for potassium ion secondary battery
  • Potassium titanyl phosphate negative electrode material for potassium ion secondary battery

Examples

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Effect test

Embodiment 1

[0026] This example shows a synthesis method of a carbon-coated potassium titanyl phosphate negative electrode material.

[0027] The carbon-coated potassium titanyl phosphate negative electrode material is synthesized by a high-temperature solid-state method, including the following steps:

[0028] a. Weigh 239.61 mg (3 mmol) of titanium dioxide powder and 408.27 mg (3 mmol) of potassium dihydrogen phosphate powder according to the stoichiometric ratio of 1:1, and mix them fully and uniformly through mechanical grinding;

[0029] b. Weigh 59.38 mg of acetylene black powder and add it to the mixed powder in step a, and then mechanically grind the new mixture to fully mix it evenly, and finally obtain the precursor powder required for the synthesis of potassium titanyl phosphate negative electrode material;

[0030] c. Place the precursor powder prepared in step b in a corundum crucible, then put it into a tube furnace protected by an argon inert atmosphere, and heat it for 12 ...

Embodiment 2

[0035] This example shows a potassium ion secondary battery with carbon-coated potassium titanyl phosphate as the negative electrode.

[0036] The composition of the negative electrode material of the potassium ion battery (assuming that the mass fraction of the negative electrode material is 100%): carbon-coated potassium titanyl phosphate accounts for 80% by weight, conductive carbon black and sodium carboxymethyl cellulose each account for 10% by weight.

[0037] Both the counter electrode and the reference electrode of the potassium ion battery are metal potassium foils.

[0038] The formula of the electrolytic solution is as follows: the solvent is diglyme; the potassium salt of the electrolyte is potassium bis(trifluoromethylsulfonyl)imide, and the concentration of the substance in the electrolytic solution is 5 mol / L.

[0039] Negative electrode sheet preparation method: Weigh each raw material according to the above-mentioned negative electrode composition ratio, unifo...

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Abstract

The invention relates to a negative electrode material for a potassium ion secondary battery. The active substance of the negative electrode material is potassium titanyl phosphate. The problems thata negative electrode material of an existing potassium ion battery is poor in circulation and rate performance, no stable charging and discharging platform is arranged, battery polarization is serious, and the charging and discharging coulombic efficiency is low are solved. The potassium titanyl phosphate negative electrode material can be directly used for a negative electrode of the secondary potassium ion battery. The battery assembled by the potassium titanyl phosphate negative electrode material and an electrolyte system is provided with a stable and high-safety charging and discharging voltage platform, and excellent electrochemical properties such as low battery overpotential polarization voltage and high charging and discharging coulombic efficiency.

Description

technical field [0001] The invention belongs to the technical field of high-energy battery materials, and in particular relates to a potassium titanyl phosphate negative electrode material suitable for potassium ion secondary batteries and its application. Background technique [0002] Potassium has abundant natural reserves (the content of potassium in the earth's crust is ~2.47%, and the concentration in seawater is ~0.38g / kg), low price and relatively negative redox potential (K + / K, -2.936V relative to the standard hydrogen electrode potential), potassium ion secondary battery technology is considered to be a very promising low-cost grid-level energy storage technology in the future. Therefore, the development of potassium-ion secondary batteries with excellent electrochemical performance and low cost, especially electrode materials, has broad commercial prospects. [0003] Due to the excessive size of potassium ions (the radius of potassium ions is 182% of that of lit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/0525
CPCH01M4/5825H01M10/0525Y02E60/10
Inventor 孙传福张如定
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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