Rechargeable aqueous Zn ion batteries in mild acidic electrolytes have attracted tremendous research interests on account of their high sustainability, low cost and safety. Remarkable improvements on MnO₂ cathodes have been achieved, however, the reaction mechanisms of MnO₂ in different crystallographic polymorphs, such as α, β and γ phase, were still in topic discussions and need to be furtherly explored. In this work, β-MnO₂ prisms hybridized with multi-wall carbon nanotubes (MWCNT) were fabricated by combining MgO-mediated hydrolyzing and hydrothermal methods. The as-fabricated β-MnO₂/MWCNT(0.4) electrode delivered specific capacity of 505 mAh g⁻¹ during cycling at current density of 0.1 A g⁻¹ and good rate capability. Long-term cycling test indicated that it could retain 93.5% of initial specific capacity after 1000 cycles at current density of 2.0 A g⁻¹. The investigation on charge/discharge process showed that amorphous Zn_0.5MnO₂·3.7H₂O thick layers (LCs) were grown on the surfaces of β-MnO₂ prisms after the first charge process and they are mutually overlapped accompanied with lots of tunnels and holes. More interestingly, the as-grown Zn_0.5MnO₂·3.7H₂O LCs permanently stay on β-MnO₂ prisms and create supplemental accommodation for charge storage. As a result, a synergetic reaction mechanism including Zn²⁺ insertion/de-insertion and layered Zn₄SO₄(OH)₆·xH₂O (ZSH) related chemical conversion was proposed to correspond for the excellent electrochemical performance of β-MnO₂/MWCNT hybrids cathode.

弱酸性电解质中的可充电水性锌离子电池由于其高可持续性、低成本和安全性而引起了人们的广泛研究兴趣。MnO ₂正极已经取得了显着的改进，然而，MnO ₂在不同晶体多晶型（例如α、β和γ相）中的反应机制仍处于热门讨论中，需要进一步探索。在这项工作中，通过结合MgO介导的水解和水热方法制备了与多壁碳纳米管（MWCNT）杂化的β-MnO _2棱柱。所制备的β-MnO ₂ /MWCNT(0.4)电极在0.1 A g ^-1的电流密度下循环期间表现出505 mAh g ^-1的比容量和良好的倍率性能。长期循环测试表明，在2.0 A g ^{-1的电流密度下，循环1000次后仍能保持93.5%的初始比容量}。充放电过程研究表明，第一次充电过程后， β-MnO ₂棱柱表面生长了非晶态Zn _0.5 MnO ₂ ·3.7H _{2 O厚层（LC），且它们相互重叠并伴有大量隧道。}和洞。更有趣的是，生长的Zn _0.5 MnO ₂ ·3.7H ₂ O 液晶永久地停留在β-MnO ₂棱镜上，并为电荷存储提供补充住宿。结果，提出了包括Zn ²⁺插入/脱嵌和层状Zn ₄ SO ₄ (OH) ₆ ·xH ₂ O (ZSH)相关化学转化的协同反应机制，以对应β-MnO的优异电化学性能₂ /MWCNT杂化阴极。