发明名称 |
A method of forming coooh and niooh in a nimh electrochemical cell and an electrochemical cell formed thereby |
摘要 |
A formation procedure for a NiMH electrochemical cell is disclosed that significantly shortens the time required to fully form such a cell. The formation procedure includes a first step during which the cell is charged at a constant voltage of preferably 1.0 volt for approximately three hours. A second charging step is performed by applying either a constant charge current at a predetermined rate of C/3 for five hours or applying a constant voltage of 1.45 to 1.5 volts for five to nine hours. A third step may optionally be used whereby the cell is charged at a constant current of C/10 for about two hours. NiMH cells subjected to this formation procedure have a much greater percentage of the starting cobalt material in the positive electrode converted to CoOOH thereby improving the conductive matrix formed about the Ni(OH)2/NiOOH particles, which constitute the active material of the positive electrode. The disclosed inventive formation procedures result in higher utilization, higher cell capacities following long-term storage, or storage at high temperatures as well as improved capacity recovery following deep discharge. |
申请公布号 |
AU6242799(A) |
申请公布日期 |
2000.03.27 |
申请号 |
AU19990062427 |
申请日期 |
1999.09.02 |
申请人 |
MOLTECH POWER SYSTEMS, INC. |
发明人 |
DEEPIKA B. SINGH |
分类号 |
H01M4/04;H01M4/52;H01M10/28;H01M10/34;H01M10/44;H02J7/00 |
主分类号 |
H01M4/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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