Manganese coating α-Ni(OH)2 as high-performance cathode material for Ni-MH battery

• Published in: Ionics 2022-03, Vol.28 (3), p.1265-1272
• Main Authors: Niu, Xiaodong, Liang, Fei, Shen, Yabin, Cheng, Yong, Wang, Chunli, Yin, Dongming, Yan, Huizhong, Zou, Binglin, Wang, Limin
• Format: Article
• Language: English
• Subjects: Anions; Chemical precipitation; Chemical synthesis; Chemistry; Chemistry and Materials Science; Coated electrodes; Condensed Matter Physics; Deceleration; Discharge; Electrochemical analysis; Electrochemistry; Electrode materials; Energy Storage; Escape structures; Interlayers; Manganese dioxide; Metal hydrides; Nickel compounds; Optical and Electronic Materials; Original Paper; Rechargeable batteries; Renewable and Green Energy; Solid phases; Water chemistry
• ISSN: 0947-7047; 1862-0760
• DOI: 10.1007/s11581-021-04366-6

The α-Ni(OH) 2 coated with manganese (Mn) materials was synthesized by the chemical precipitation method, and the electrochemical properties were investigated. The results showed that the ingredient of the coating is a mixture of MnO 2 and Mn 2 O 3 , and the coating can inhibit the intercalated anions escape and stabilize the α-Ni(OH) 2 phase structure in KOH alkaline solution. The coated electrodes have higher discharge capacities and higher capacity retention rates than the uncoated α-Ni(OH) 2 electrode, the discharge capacity of Mn-coated electrodes is over 350 mAh g −1 , and the capacity retention rate exceeds 92%, separately. The reason may be that the Mn coatings can block or decelerate water molecule and the anion to escape from the interlayers, therefore prevent α phase structural collapse and maintain high discharge capacity during a long lifespan cycle. Therefore, the Mn coating α-Ni(OH) 2 is a promising candidate for high-power Ni-MH batteries.