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Method for preparing MnO2/silver composite cathode of Li-Mn cell

A technology of manganese dioxide and lithium-manganese batteries, which is applied in electrode manufacturing and other directions, and can solve problems such as poor conductivity

Inactive Publication Date: 2007-10-17
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcoming of poor conductivity of manganese dioxide, and provide a method for preparing a manganese dioxide / silver composite cathode for a lithium manganese battery that can provide high specific capacity and high specific energy under high current discharge conditions

Method used

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  • Method for preparing MnO2/silver composite cathode of Li-Mn cell
  • Method for preparing MnO2/silver composite cathode of Li-Mn cell

Examples

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Effect test

Embodiment 1

[0020] Heat-treat electrolytic manganese dioxide at 375°C for 12 hours to obtain manganese dioxide for lithium-manganese batteries (see Figure 1a), mix manganese dioxide and acetylene black at a ratio of 50:5, add a certain amount of PTFE emulsion, and adjust to a uniform of sticky matter, filling it in an apparent area of ​​1.5cm 2 In the nickel foam, dry at 80°C, press-molded at 12MPa, and vacuum-dry at 120°C for 24h to obtain a manganese dioxide electrode.

Embodiment 2

[0022] Pour the electrolytic manganese dioxide heat-treated at 375°C for 12 hours into the silver plating solution, stir at an appropriate speed at 25°C for 12 hours, filter and wash three times, then vacuum-dry at 110°C for 24 hours to obtain manganese dioxide / silver composite (see Figure 1b). The amount of silver plating was 3.5 wt%. As in Example 1, a manganese dioxide electrode was prepared by replacing the manganese dioxide in Example 1 with a manganese dioxide / silver composite material.

Embodiment 3

[0024] During the silver plating process, the temperature was controlled at 12° C., and a manganese dioxide / silver composite material was prepared with reference to Example 2. And referring to Example 1, a manganese dioxide electrode was prepared.

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Abstract

This invention provides a preparation method for MnO2 / Ag compound cathode of a LiMn battery providing high specific capacity and specific energy under the large current discharging condition including: putting electrolyzed MnO2 in an Ag-plating solution after heat treatment under 12-40deg.C to be mixed, filtered and cleaned to be processed to MnO2 / Ag compound material after drying, applying foamed Ni filling method and mixing said compound material with acetylene black uniformly to be added with PTFE latex to be mixed to a viscose and filled into the foamed Ni to be dried and pressed to formation then to be dried in vacuum.

Description

technical field [0001] The invention relates to a lithium-manganese battery cathode, in particular to a preparation method for a manganese dioxide / silver composite cathode used in a high-power lithium-manganese battery. Background technique [0002] Although lithium-manganese batteries have achieved a fairly successful and stable preparation process and good discharge performance after years of development, compared with their theoretical limit, there is still a lot of room for improvement, especially because of their own conductivity. Because of the low current, the high-current discharge performance is poor. In the case of high-rate discharge, the voltage platform is low and the energy density is low. Therefore, many researchers are still researching and striving to further improve the performance of lithium-manganese batteries. W. L. Baodeng etc. adopt the method of ion exchange, replace the ion-exchangeable cations existing in manganese dioxide with lithium, and then obt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04
CPCY02E60/12Y02E60/10
Inventor 杨勇黄行康岳红军
Owner XIAMEN UNIV
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