Polypyrrole coated δ-MnO2 nanosheet arrays as a highly stable lithium-ion-storage anode. Issue 23 (3rd June 2020)

• Record Type: Journal Article
• Authors: Sui, Yiming; Liu, Chaofeng; Zou, Peichao; Zhan, Houchao; Cui, Yuanzheng; Yang, Cheng; Cao, Guozhong
• Is Part Of: Dalton transactions. Volume 49:Issue 23(2020)
• Page Start: 7903
• Page End: 7913
• Publication Date: 2020-06-03
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/d0dt01658f
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : Manganese dioxide (MnO2 ) with a conversion mechanism is regarded as a promising anode material for lithium-ion batteries (LIBs) owing to its high theoretical capacity (∼1223 mA h g −1 ) and environmental benignity as well as low cost. Abstract : Manganese dioxide (MnO2 ) with a conversion mechanism is regarded as a promising anode material for lithium-ion batteries (LIBs) owing to its high theoretical capacity (∼1223 mA h g −1 ) and environmental benignity as well as low cost. However, it suffers from insufficient rate capability and poor cyclic stability. To circumvent this obstacle, semiconducting polypyrrole coated-δ-MnO2 nanosheet arrays on nickel foam (denoted as MnO2 @PPy/NF) are prepared via hydrothermal growth of MnO2 followed by the electrodeposition of PPy on the anode in LIBs. The electrode with ∼50 nm thick PPy coating exhibits an outstanding overall electrochemical performance. Specifically, a high rate capability is obtained with ∼430 mA h g −1 of discharge capacity at a high current density of 2.67 A g −1 and more than 95% capacity is retained after over 120 cycles at a current rate of 0.86 A g −1 . These high electrochemical performances are attributed to the special structure which shortens the ion diffusion pathway, accelerates charge transfer, and alleviates volume change in the charging/discharging process, suggesting a promising route for designing a conversion-type anode material for LIBs.