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Preparation method of high-performance sodium-ion battery cathode material

A sodium-ion battery, high-performance technology, used in battery electrodes, electrolyte battery manufacturing, secondary batteries, etc., can solve the problems of low charge and discharge capacity, harsh synthesis conditions, etc., achieve good stability, reversible charge and discharge capacity improvement, The effect of improved performance

Active Publication Date: 2018-07-27
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the deficiencies of the prior art. In order to improve the synthesis conditions of the inverse spinel structure sodium manganese-based material and the problem of low charge and discharge capacity, we propose a method for preparing a high-performance sodium ion positive electrode material.

Method used

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  • Preparation method of high-performance sodium-ion battery cathode material
  • Preparation method of high-performance sodium-ion battery cathode material
  • Preparation method of high-performance sodium-ion battery cathode material

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A preparation method of an air-stable sodium-ion battery negative material, comprising the steps of:

[0030] (1) Material preparation: On the basis of the molar ratio Na:Mn:Ti=1:1:1, the excessive 10% of sodium carbonate was used to compensate for the volatilization loss, and 5.83g of sodium carbonate (Na 2 CO 3 ), 7.983g of manganese trioxide (Mn 2 o 3 ), 7.893g of titanium dioxide (TiO 2 );

[0031] (2) Mix the samples weighed in (1) into a ball mill jar, add 20mL of absolute ethanol;

[0032] (3) Put (2) into a planetary ball mill for ball milling for 15 hours, where the speed is 200r / min;

[0033] (4) Collect the sieved and ball-milled product, dry at 80°C for 12 hours, and naturally cool down to 30°C;

[0034] (5) Grind the dried powder in (4), take 0.5g and press it with a pressure of 10Mpa, the diameter of the tablet is about 12.75mm, and the thickness is about 3mm;

[0035] (6) Sintering: Ar atmosphere, at 3°min -1 heating rate, sintering at 650°C for 4...

example 1

[0045] The material prepared as described in Example 1 is tested with XRD (Minflex 600), with 1 ° min -1 The scanning speed is scanned in the interval 2-Theta of 5-55°, and the obtained XRD diffraction pattern is as follows figure 1 As shown, the ordinate is an arbitrary unit, and the abscissa is 2-Theta (°). It can be seen from XRD that the sample we prepared is pure phase Na 4 mn 4 Ti 5 o 18 ; The obtained battery is left standing in the ambient air for 2 to 10 hours, using the LAND battery test system in the ambient air at room temperature (25±2°C), the battery is in the voltage range of 2.0-4.0V, 20mA g -1 The charge and discharge test was carried out at a current density of figure 2 Charge and discharge cycle curve, charge and discharge 60 cycles. figure 2 It is the cycle graph of the battery assembled in Example 1. The abscissa represents the specific capacity, the unit is mAh g -1 , the ordinate represents the voltage, and the unit is V. The curves correspondin...

Embodiment 2

[0047] Step (1-13) is identical with embodiment 1;

[0048] (14) Battery test: use blue battery for charge and discharge test, voltage range 2.0-4.0V, current density 200mA g -1 .The obtained charge-discharge cycle curve is as follows Figure 4 .

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Abstract

The invention provides a preparation method of a high-performance sodium-ion battery cathode material. The method comprises the following steps of mixing sodium carbonate, manganic oxide and titaniumdioxide, adding an obtained mixture into a ball milling tank, adding absolute ethyl alcohol, then performing ball milling, tabletting and calcining in a ball mill for 20 to 25h, cooling to room temperature, performing tabletting again, calcining at 730 to 780 DEG C to obtain an active material Na4Mn4Ti5O18; then adding the active material, a conductive agent Ketjen Black (KB) and an aqueous solution of a binding agent sodium carboxymethylcellulose (CMC) into the ball milling tank, adding water and performing ball milling for 3 to 5h, so as to prepare slurry; then coating a current collector Alfoil with the slurry to prepare an electrode sheet, performing vacuum drying to obtain the high-performance sodium-ion battery cathode material. Through the doping of the non-active metal cation Ti,the electrochemical performance of the material can be further improved at the relatively low temperature of 650 to 750 DEG C, and the stability is better.

Description

technical field [0001] The invention relates to a positive electrode of a sodium-ion battery, in particular to a preparation method of a high-stability sodium ion positive electrode material, which belongs to the related field of battery technology. Background technique [0002] The storage and conversion of energy has become an important issue restricting the sustainable development of the world economy. Among the current various technologies, lithium-ion batteries have conquered the portable electronics market due to their advantages such as high working voltage, high capacity, small self-discharge and long cycle life, and have become the mainstay of electric vehicles (including EV and HEV, etc.) and large-scale storage applications. The primary choice of power supply for power systems. However, with the advent of the era of electric vehicles and smart grids, global lithium resources will not be able to effectively meet the huge demand for power lithium-ion batteries, whi...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M10/054H01M10/058H01M4/131H01M4/1391
CPCH01M4/131H01M4/1391H01M4/364H01M4/485H01M4/505H01M10/054H01M10/058Y02E60/10Y02P70/50
Inventor 刘喜正张瑞娥丁轶
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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