access icon free Electrochemically produced battery-type Ni(OH)2/Ni3Si electrodes

The fabrication, by an electrochemical process, of a new battery-type electrode material, is presented. Such materials are fabricated by direct current electrodeposition of Ni(OH)2 on lamellar Ni3Si. Microstructure and morphology of Ni(OH)2/Ni3Si electrodes were characterised. Cyclic voltammetry and galvanostatic charge–discharge results revealed that they are battery-type electrodes. Increasing deposition time or decreasing discharge current can significantly increase the areal capacity. The areal capacity of Ni(OH)2/Ni3Si-20 with a discharge current of 20 mA is only 2.8% of that with 1 mA. However, the increasing deposition time will reduce the cyclic stability of the electrodes. The initial areal capacity of Ni(OH)2/Ni3Si-20 is twice that of Ni(OH)2/Ni3Si-10 with a discharge current of 10 mA, but after 1000 cycles, it can only maintain 59.3% of the initial value. This Letter is expected to provide a powerful reference and guidance for the preparation of electrodes with large areal capacity and cycle stability.

Inspec keywords: nickel; electrodeposition; voltammetry (chemical analysis); secondary cells; discharges (electric); nickel alloys; electrochemical electrodes; nickel compounds; lithium compounds; electrochemistry

Other keywords: cyclic voltammetry; battery-type electrode material; areal capacity; discharge current; direct current electrodeposition; cycle stability; current 10.0 mA; electrodes; current 20.0 mA; cyclic stability; galvanostatic charge–discharge results; current 1.0 mA

Subjects: Secondary cells; Secondary cells; Deposition from liquid phases (melts and solutions); Electrochemistry and electrophoresis

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http://iet.metastore.ingenta.com/content/journals/10.1049/mnl.2020.0316
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