CHEMICAL AND ELECTROCHEMICAL SYNTHESIS OF NICKEL

D. BACKER; G. GARAVENTTA,; F.J. RODRÍGUEZ NIETO; A, VISINTIN; P. BARATH; M. SEDLARIKOVA; J. VONDRAK

Brno, Rep. Checa

Congreso; 11th Advanced Batteries, Accumulators and Fuel Cells Aqueous batteries; 2010

11th Advanced Batteries, Accumulators and Fuel Cells Aqueous batteries

Nickel hydroxide is still widely used as electrode material in different types of rechargeable batteries, such as Ni-Cd, Ni-H2, Ni-Fe, and Ni-MH batteries [1], especially in those with  high specific energy that are employed in a range of portable electronic devices and electric cars. Nickel hydroxide is also used as a precursor in various catalytic processes [2]. Currently, the development of Ni-MH batteries allows for the production of devices with  high specific energy [3,4]. Nickel hydroxide is a complex crystalline material having a structure that generally depends on the preparation method. It occurs in polymorphic forms such as -Ni(OH)2 and - Ni(OH)2, which are transformed into -NiOOH and -NiOOH during the electrode charging process. The electrochemical behavior of these phases differs from one to another due to changes in their structure, composition and morphological characteristics that modify the different processes occurring during charge and discharge cycles. Therefore, the electrode manufacturing process plays a key role in the electrochemical behavior of nickel hydroxide.