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A kind of modification method of electrode material of sodium ion battery

A sodium ion battery and electrode material technology, applied in battery electrodes, electrode manufacturing, electrode heat treatment, etc., can solve the problems of cycle performance, poor rate, and low stability, and achieve better rate performance, improved cycle performance, and low price Effect

Active Publication Date: 2016-08-31
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a method for modifying the electrode material of a sodium ion battery, the purpose of which is to coat the surface of lithium potassium titanate which can be used as a negative electrode material of a sodium ion battery with a carbon layer , so as to solve the technical problems of low stability, poor cycle performance and poor rate when lithium potassium titanate is directly applied as the anode material of sodium ion battery

Method used

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  • A kind of modification method of electrode material of sodium ion battery
  • A kind of modification method of electrode material of sodium ion battery
  • A kind of modification method of electrode material of sodium ion battery

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Embodiment 1

[0033] Put the lithium potassium titanate powder into the tube furnace after ball milling, and then pass Ar / C into the tube furnace 2 h 2 Mixed gas, in which, Ar and C 2 h 2 The volume ratio is 99:1, the pressure in the tube furnace is 101kPa, and it is sintered at 550°C for 30 minutes to obtain the final product of carbon-coated lithium potassium titanate. The thickness of the carbon layer is uniform, and the thickness is 1 nanometer.

Embodiment 2

[0035] Put the lithium potassium titanate powder into the tube furnace after ball milling, and then pass Ar / C into the tube furnace 3 h 6 Mixed gas, among them, Ar and / C 3 h 6 The volume ratio is 96:4, the pressure in the tube furnace is 101kPa, and then sintered at 675°C for 1 hour to obtain the final product of carbon-coated lithium potassium titanate. The thickness of the carbon layer is uniform, and the thickness is 2 nanometers.

Embodiment 3

[0037] Put the lithium potassium titanate powder into the tube furnace after ball milling, and then feed N into the tube furnace 2 / CH 4 Mixed gas, in which the volume ratio of N2 to CH4 is 90:10, the pressure in the tube furnace is 101kPa, and then sintered at 800°C for 5 hours to obtain the final product of carbon-coated lithium potassium titanate, and the thickness of the carbon layer is detected by experiment uniform, with a thickness of 10 nm.

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Abstract

The invention discloses a modification method for an electrode material of a sodium-ion battery. The modification method is used for coating the surface of lithium potassium titanate serving as a battery cathode material with a carbon layer in nanometer thickness, carbon cladding is performed by a sintering method, a carbon source coats the surface of the lithium potassium titanate after high-temperature pyrolysis, in the sintering method, one or more of a gas-phase organic matter, a solid-phase organic matter and a liquid-phase organic matter serve(s) as the carbon source, the sintering method comprises one or more of a solid-phase sintering method, a gas-phase sintering method and a liquid-phase sintering method, the sintering temperature is 550-800 DEG C, the sintering time is 5 minutes to 5 hours, and the uniform carbon layer with the thickness of 1-100 nanometers coats the surface of the lithium potassium titanate. By the modification method disclosed by the invention, the problem that the lithium potassium titanate serving as the cathode material of the sodium-ion battery is poor in stability, cyclicity and magnification is solved.

Description

technical field [0001] The invention belongs to the field of electrode materials for sodium ion batteries, and more specifically relates to a modification method for electrode materials for sodium ion batteries. Background technique [0002] With the development of sodium-ion battery materials, more and more researches have been done on the anode materials of sodium-ion batteries. Among them, layered metal compounds have attracted much attention as battery materials because of their objective capacity and two-dimensional channels for fast insertion and extraction of sodium ions. favored by researchers. Lepidotype (γ-FeOOH) titanate is a kind of layered material, lithium potassium titanate (K 0.8 Ti 1.73 Li 0.27 o 4 ) is also a member of this family. Lithium potassium titanate has an open crystal structure, which is easy to realize ion exchange, and can be used as a negative electrode material for sodium ion batteries. [0003] When lepidotype lithium potassium titanate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/62
CPCH01M4/0471H01M4/485H01M4/625Y02E60/10
Inventor 张五星陈孔耀黄云辉
Owner HUAZHONG UNIV OF SCI & TECH