Green large-scale production of N/O-dual doping hard carbon derived from bagasse as high-performance anodes for sodium-ion batteries

绿色大规模制备甘蔗渣衍生的N/O双掺杂硬碳用作高性能钠离子电池负极

Sodium-ion batteries are considered as a promising candidate for lithium-ion batteries due to abundant sodium resources and similar intercalation chemistry.Hard carbon derived from biomass with the virtue of abundance and renewability is a cost-effective anode material.Herein,hard carbon is derived from renewable bagasse through a simple two-step method combining mechanical ball milling with carbonization.The hard carbon electrodes exhibit superior electrochemical performance with a high reversible capacity of 315 mA∙h/g.Furthermore,the initial capacity of the full cell,HC//NaMn0.4Ni0.4Ti0.1Mg0.1O2,is 253 mA∙h/g and its capacity retention rate is 77%after 80 cycles,which further verifies its practical application.The simple and low-cost preparation process,as well as excellent electrochemical properties,demonstrates that hard carbon derived from bagasse is a promising anode for sodium-ion batteries.

得益于丰富的钠资源和类似的插层化学性质,钠离子电池被认为是一种很有前途的锂离子电池替代者。生物质硬碳具有来源丰富、可再生的优点,是一种高性价比的阳极材料。本文采用简单两步法,机械球磨和炭化,将可再生甘蔗渣制备成硬碳材料。这种硬碳电极具有较高的可逆容量(315 mA∙h/g),表现出优秀的电化学性能。此外,在全电池HC//NaMn0.4Ni0.4Ti0.1Mg0.1O2中的初始容量达253 mA∙h/g,80次循环后容量仍有77%,进一步验证了其实际应用价值。简单、低成本的制备工艺以及优异的电化学性能表明,甘蔗渣硬碳是一种很有前途的钠离子电池负极材料。