【摘要】 水系锌离子电池凭借其高安全性、良好的成本效益以及环境友好的特性，被视为大规模储能领域极具潜力的候选者之一。然而，锌阳极表面不可控的枝晶生长以及相关副反应降低了电池的稳定性。本文通过浮动化学气相沉积法并结合在空气中的热处理，制备了空气氧化碳纳米管（O-CNT）薄膜，并将其作为锌箔的保护层以抑制枝晶的生长。空气氧化调节了薄膜的亲水性，促进了锌沉积在薄膜与锌箔之间的界面，而非薄膜的表面。同时，O-CNT薄膜的导电多孔结构能够均匀Zn²⁺流和锌箔表面电场，从而实现锌的均匀沉积。O-CNT@Zn对称电池的循环稳定性得到显著增强，在电流密度为1 mA cm^-2容量为1 mAh cm^-2的条件下，寿命超过3000 h，即便在5 mA cm^-2的高电流密度下，寿命也超过2000 h。此外，使用Mn²⁺预插层水合五氧化二钒（MnVOH）作为正极材料，O-CNT@Zn||MnVOH全电池的倍率性能优于Zn||MnVOH全电池，在8 A g^-1的电流密度下，具有194 mAh g^-1的高放电容量。在长期循环测试中，O-CNT@Zn||MnVOH全电池在5 A g^-1的电流密度下经2000次循环后，容量保持率达58.8%。更多还原

【Abstract】 Aqueous zinc ion batteries are regarded as one of the most promising candidates for large-scale energy storage due to their high safety,cost-effectiveness,and environmental friendliness.However,uncontrolled zinc dendrite growth and side reactions of the zinc anode decrease the stability of Zn batteries.We report the synthesis of an air-oxidized carbon nanotube（O-CNT） film by chemical vapor deposition followed by heat treatment in air which is used as a protective layer on the Zn foil to suppress zinc dendrite growth.The increase in the hydrophilicity of the O-CNT film caused by air oxidation facilitates zinc deposition between the film and the anode instead of deposition on the film surface.The porous structure of the O-CNT film homogenizes the Zn²⁺ion flux and the electric field on the surface of the Zn foil,leading to the uniform deposition of Zn.As a result,a O-CNT@Zn symmetric cell has a much better cycling stability with a life of more than 3000 h at 1 mA cm^-2 with a capacity of 1 mAh cm^-2,and values of more than 2000 h and 1 mAh cm^-2 at5 mA cm^-2.In addition,a O-CNT@Zn||Mn²⁺inserted hydrated vanadium pentoxide（MnVOH） full cell has a better rate performance than a Zn||MnVOH cell,achieving a high discharge capacity of 194 mAh g^-1 at a high current density of 8 A g^-1.In a long-term cycling test,the O-CNT@Zn||MnVOH full cell has a capacity retention of 58.8%after 2000 cycles at a current density of 5 A·g^-1.更多还原