The γ-MnO_2@CNT catalyst was prepared by in situ solid phase synthesis and first applied into sodium-air batteries(SABs). The initial discharge specific capacity of SABs with γ-MnO_2@CNT catalyst can reach 8804 mA h...The γ-MnO_2@CNT catalyst was prepared by in situ solid phase synthesis and first applied into sodium-air batteries(SABs). The initial discharge specific capacity of SABs with γ-MnO_2@CNT catalyst can reach 8804 mA h g^(-1) and the overpotential gap is only 140 m V, which is better than the batteries that is catalyzed by α-MnO_2@CNT and pure CNT. Besides, the batteries also exhibit excellent cycle performance, which can keep relatively stable for 246 cycles at 500 mA g^(-1) and 140 cycles at1000 mA g^(-1).展开更多
Although flexible sodium-air(Na-air)batteries with high theoretical energy density offer promising opportunities for next-generation smart electronics,enhancing the safety and efficiency of flexible sodium metal anode...Although flexible sodium-air(Na-air)batteries with high theoretical energy density offer promising opportunities for next-generation smart electronics,enhancing the safety and efficiency of flexible sodium metal anodes under dynamic and continuous deformation remains a challenge.Here,a flexible sodiated carbon nanotube layer to suppress dendrite growth under various deformations is demonstrated through a Fermi level-driven spontaneous synthetic process.The resulting sodiated carbon nanotube layer,which has a spontaneously formed solid-electrolyte interface and a robust interlocked structure,creates a uniformly distributed electric field and stable interface even under deformation,affording dendrite-free flexible Na metal anodes.With this deformation-tolerant Na metal anode,we have constructed a new family of highly flexible Na-air fiber batteries with excellent cycling performance for 400 cycles at a current density of 1000mA·g^(−1) and a capacity limit of 500 mAh·g^(−1) under dynamic deformation.These Na-air fiber batteries can be further woven into self-powering systems to support flexible electronic devices.展开更多
基金supported by the National Key R&D Program (2016YFB0901502, 2016YFB0101201)the National Natural Science Foundation of China (NSFC) (51771094)Ministry of Education (B12015), and Tianjin High-Tech (18JCZDJC31500)
文摘The γ-MnO_2@CNT catalyst was prepared by in situ solid phase synthesis and first applied into sodium-air batteries(SABs). The initial discharge specific capacity of SABs with γ-MnO_2@CNT catalyst can reach 8804 mA h g^(-1) and the overpotential gap is only 140 m V, which is better than the batteries that is catalyzed by α-MnO_2@CNT and pure CNT. Besides, the batteries also exhibit excellent cycle performance, which can keep relatively stable for 246 cycles at 500 mA g^(-1) and 140 cycles at1000 mA g^(-1).
文摘Although flexible sodium-air(Na-air)batteries with high theoretical energy density offer promising opportunities for next-generation smart electronics,enhancing the safety and efficiency of flexible sodium metal anodes under dynamic and continuous deformation remains a challenge.Here,a flexible sodiated carbon nanotube layer to suppress dendrite growth under various deformations is demonstrated through a Fermi level-driven spontaneous synthetic process.The resulting sodiated carbon nanotube layer,which has a spontaneously formed solid-electrolyte interface and a robust interlocked structure,creates a uniformly distributed electric field and stable interface even under deformation,affording dendrite-free flexible Na metal anodes.With this deformation-tolerant Na metal anode,we have constructed a new family of highly flexible Na-air fiber batteries with excellent cycling performance for 400 cycles at a current density of 1000mA·g^(−1) and a capacity limit of 500 mAh·g^(−1) under dynamic deformation.These Na-air fiber batteries can be further woven into self-powering systems to support flexible electronic devices.
