Growth of Hierarchical MnO2 Nanospike on Three‐Dimensional Carbon Network for Enhancing Rechargeability as High‐rate Alkaline Battery Cathode. Issue 11 (19th March 2019)

• Record Type: Journal Article
• Authors: Zhou, Lin‐Nan; Zhang, Jing‐Xuan; Xu, Meng‐Ying; Kuang, Wen‐Tao; Liu, Hong‐Tao; Li, Yong‐Jun
• Is Part Of: ChemistrySelect. Volume 4:Issue 11(2019)
• Page Start: 3204
• Page End: 3209
• Publication Date: 2019-03-19
• Subjects: Manganese dioxide -- carbon foam -- nanospike -- high-rate cathode -- rechargeability; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.201900151
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: MnO2 material has been widely utilized in primary batteries because of its high theoretical capacity, rich resources, and low cost, which, however, does not exhibit satisfactory reversible capacity and cycle life when used as a secondary battery cathode. To upgrade the rechargeability of MnO2 material, we herein fabricated a hierarchical nanocomposite by in‐situ growth of MnO2 nanostructure on carbonized melamine sponge (MnO2 /C). The optimized MnO2 /C nanostructure consisting of hierarchical nanospikes shows a high reversible capacity of 205 mAh⋅g ‐1 at 1 C and retained 96% of its initial capacity after 400 cycles, and even at 5 C (i. e. 1540 mA⋅g ‐1 ), the capacity retention still reaches 90% after 400 cycles, indicative of its remarkable high‐rate cycling stability. This study provides a new avenue for designing high‐rate rechargeable MnO2 cathode and may further advance the development of MnO2 ‐based secondary batteries. Abstract : Three‐dimensional hierarchical MnO2 /C nanocomposites achieved by in‐situ growth of MnO2 nanostructure on the skeleton of carbonized melamine sponges. Optimized MnO2 /GCF consisting of hierarchical MnO2 nanospikes, shows high accessible capacity, superior rate stability and long‐term cyclability when used as the cathode material in alkaline electrolyte, offering great hope for the development of MnO2 ‐based rechargeable batteries