α-MnO2/super-P with conductive carbon network for rechargeable aqueous Zinc ion batteries

Recent Advances on Challenges and Strategies of Manganese Dioxide Cathodes for Aqueous Zinc‐Ion Batteries

“…Researchers have combined cathode materials with conductive carbon to improve its conductivity and restrain structural changes during cycling, and thus achieving excellent electrochemical performance. [186][187][188] Wang et al [165] combined γ-MnO 2 nanorods with graphene, which improves the electrical conductivity of MnO 2 and also endows MnO 2 with the ability to adapt the structural damage and dissolution in the process of charging and discharging. It significantly solves the problem of low rate performance and cycling life of MnO 2 .…”

Microporous Polymer Coatings Enable Uniform Zn Stripping/Plating for Long-Life Aqueous Zinc-Ion Batteries

“…z E-mail: maowutao@126.com; baokeyan@126.com Preparation of Zn/PAN composites.-0.1 g of polyacrylonitrile and 0.9 g of N, N-dimethylamide were stirred at 100 °C for 3 h to obtain a yellow oily liquid, which was cooled to room temperature in a vacuum drying oven. 30 The subsequent procedure is the same as Zn/PAM composites electrode, except that the acrylonitrile oily liquid is substituted for the acrylamide colloid to obtain the material labeled as Zn/PAN. Preparation of electrolyte.-2 M ZnSO 4 aqueous electrolyte was prepared using ZnSO 4 •7H 2 O and deionized water based on molar ratio.…”

Nanostructure Design of MnO2/Partially Oxidized Graphene Nanocomposite Cathode via One-Step Pulse Potential Strategy: Toward Ultralong-Life Zinc-Ion Batteries

“…Since the facial diffusion of zinc ions is easily provided by the large tunnels in the α-MnO 2 structure, high capacity is generated for ZIBs. 19,20,24 Nevertheless, the low electronic conductivity of MnO 2 (i.e., 10 −5 and 10 −6 S•cm −1 ), coupled with the gradual dissolution of manganese during the insertion of zinc ions, leads to rapid capacity fading and inferior cycling stability. These factors restrict the practical application of MnO 2 -based cathode materials.…”

“…Consequently, they have undergone thorough investigations as superior electrode materials for ZIBs, sodium-ion batteries (SIBs), and LIBs. − Thus, diverse crystallographic polymorphs of manganese oxides, encompassing α-, β-, γ-, δ-, and λ-MnO 2 , α-Mn 2 O 3 , and ZnMn 2 O 4 , have been investigated as potential cathodes for ZIBs. ,,− In particular, the hollandite-type α-MnO 2 with a large 2 × 2 tunnel structure attracted great interest as a promising cathode material for ZIBs. Since the facial diffusion of zinc ions is easily provided by the large tunnels in the α-MnO 2 structure, high capacity is generated for ZIBs. ,, Nevertheless, the low electronic conductivity of MnO 2 (i.e., 10 –5 and 10 –6 S·cm –1 ), coupled with the gradual dissolution of manganese during the insertion of zinc ions, leads to rapid capacity fading and inferior cycling stability. These factors restrict the practical application of MnO 2 -based cathode materials. ,, Indeed, introducing Mn 2+ additive (MnSO 4 ) into the aqueous ZnSO 4 electrolyte compensates for manganese dissolution from the cathode material.…”

“…Manganese oxides exhibit distinctive features, including a notable theoretical capacity, high operational voltage, low toxicity, favorable environmental compatibility, abundant resources, and potential for industrial production. Consequently, they have undergone thorough investigations as superior electrode materials for ZIBs, sodium-ion batteries (SIBs), and LIBs. − Thus, diverse crystallographic polymorphs of manganese oxides, encompassing α-, β-, γ-, δ-, and λ-MnO 2 , α-Mn 2 O 3 , and ZnMn 2 O 4 , have been investigated as potential cathodes for ZIBs. ,,− In particular, the hollandite-type α-MnO 2 with a large 2 × 2 tunnel structure attracted great interest as a promising cathode material for ZIBs. Since the facial diffusion of zinc ions is easily provided by the large tunnels in the α-MnO 2 structure, high capacity is generated for ZIBs. ,, Nevertheless, the low electronic conductivity of MnO 2 (i.e., 10 –5 and 10 –6 S·cm –1 ), coupled with the gradual dissolution of manganese during the insertion of zinc ions, leads to rapid capacity fading and inferior cycling stability.…”