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High-conductivity composite positive electrode for aluminum ion battery

A technology of aluminum ion battery and composite positive electrode, which is applied to battery electrodes, secondary batteries, circuits, etc., can solve the problems of reduced battery cycle performance, positive electrode damage, and the need to improve the conductivity of metal oxide positive electrodes.

Inactive Publication Date: 2017-03-29
NANJING ZHONGCHU NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, transition metal oxides will cause damage to the positive electrode due to volume expansion during charge and discharge, thereby reducing the battery cycle performance, and the conductivity of the metal oxide positive electrode needs to be improved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Preparation of titanium dioxide nanotube arrays: the polished 0.3 mm thick titanium sheet was ultrasonically cleaned in acetone and deionized water, dried as an anode, platinum sheet as a cathode, and the fluorine-containing compound NH 4 F Electrolyze at constant voltage in the electrolyte, react for 3 hours, take out the product and wash and dry it with deionized water, then place the product in a muffle furnace for calcination at 600°C for 10 hours to obtain a titanium dioxide nanotube array;

[0020] (2) Doped with Ti 3+ : the titanium dioxide nanotube array prepared above was used as the working electrode, the platinum sheet was used as the counter electrode, and the saturated calomel electrode was used as the reference electrode. 2 SO 4 Steady-state polarization to obtain Ti3+ doped modified titanium dioxide nanotube arrays;

[0021] (3) Composite sulfur: combine sulfur with Ti 3+ The doped and modified titanium dioxide nanotube arrays were placed together ...

Embodiment 2

[0024] (1) Preparation of titania nanotube arrays: The polished 0.3mm thick iron sheet was ultrasonically cleaned in acetone and deionized water, dried as an anode, platinum sheet as a cathode, and electrolyzed at a constant voltage in a fluorine-containing compound NaF electrolyte. After reacting for 12 hours, the product was taken out, washed and dried with deionized water, and then placed in a muffle furnace for calcination at 600°C for 10 hours to obtain a titanium dioxide nanotube array;

[0025] (2) Doped with Ti 3+ : The titania nanotube array prepared above is used as the working electrode, the platinum sheet is used as the counter electrode, and the saturated calomel electrode is used as the reference electrode, and it is polarized in an inert electrolyte HCl in a steady state to obtain Ti 3+ Doped modified titania nanotube arrays;

[0026] (3) Composite sulfur: combine sulfur with Ti 3+ The doped and modified titanium dioxide nanotube arrays are placed together in ...

Embodiment 3

[0029] (1) Preparation of titanium dioxide nanotube arrays: The polished 0.3 mm thick titanium alloy sheet was ultrasonically cleaned in deionized water, then immersed in a mixture of hydrofluoric acid and nitric acid for 2 minutes, washed and dried with deionized water again, and then used as an anode. The platinum sheet is the cathode, and in the fluorine-containing compound NH 4 F Electrolyze at constant voltage in the electrolyte, react for 3 hours, take out the product and wash and dry it with deionized water, then place the product in a muffle furnace for calcination at 600°C for 10 hours to obtain a titanium dioxide nanotube array;

[0030] (2) Doped with Ti 3+ : the titanium dioxide nanotube array prepared above was used as the working electrode, the platinum sheet was used as the counter electrode, and the saturated calomel electrode was used as the reference electrode. 2 SO 4 In the steady-state polarization, Ti 3+ Doped modified titania nanotube arrays;

[0031]...

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PUM

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Abstract

The invention discloses a high-conductivity composite positive electrode for an aluminum ion battery. The composite positive electrode comprises a modified titanium dioxide nano-tube array and elemental sulfur, wherein the elemental sulfur is adhered onto the surface and nanometer holes of the modified titanium dioxide nano-tube array. A preparation process for the high-conductivity composite positive electrode is simple and does not use a conductive agent and a binder; and the modified titanium dioxide nano-tube array has high conductivity and exerts strong bonding effect on sulfur, so sulfur loss is inhibited, and the conductivity and cycle stability of the aluminum ion battery are improved.

Description

technical field [0001] The invention belongs to the field of electrochemistry and new energy products, and relates to a high-conductivity composite positive electrode for an aluminum ion battery and a preparation method thereof. Background technique [0002] With the rapid development of mobile electronic and communication equipment, the demand for secondary batteries is more urgent, and it is increasingly inclined to the development of dense, thin, small, light and high energy density batteries. The development and application of aluminum ion batteries And born. In the prior art, aluminum-sulfur batteries have been studied more, but there are still many problems, such as the loss of active materials, poor conductivity, and the intermediate polysulfide produced during the reduction process is easily soluble in the electrolyte, and some The dissolved polysulfide diffuses to the surface of the metal aluminum negative electrode to generate a self-discharge reaction and deposit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M10/054B82Y30/00
CPCB82Y30/00H01M4/362H01M4/38H01M4/483H01M10/054Y02E60/10
Inventor 赵宇光
Owner NANJING ZHONGCHU NEW ENERGY
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