Regenerable Cu-intercalated MnO₂ layered cathode for highly cyclable energy dense batteries.

ABSTRACT: Manganese dioxide cathodes are inexpensive and have high theoretical capacity (based on two electrons) of 617 mAh g^-1, making them attractive for low-cost, energy-dense batteries. They are used in non-rechargeable batteries with anodes like zinc. Only ∼10% of the theoretical capacity is currently accessible in rechargeable alkaline systems. Attempts to access the full capacity using additives have been unsuccessful. We report a class of Bi-birnessite (a layered manganese oxide polymorph mixed with bismuth oxide (Bi₂O₃)) cathodes intercalated with Cu²⁺ that deliver near-full two-electron capacity reversibly for >6,000 cycles. The key to rechargeability lies in exploiting the redox potentials of Cu to reversibly intercalate into the Bi-birnessite-l

SUBMITTER: Yadav GG 

PROVIDER: S-EPMC5343464 | biostudies-literature | 2017 Mar

REPOSITORIES: biostudies-literature