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//NaMn_0.4Ni_0.4Ti_0.1Mg_0.1O₂, 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.

钠离子电池因其丰富的钠资源和类似的嵌入化学而被认为是锂离子电池的有前途的候选者。凭借丰富和可再生性而衍生自生物质的硬碳是一种经济高效的阳极材料。在此，硬碳是通过机械球磨与碳化相结合的简单两步法从可再生蔗渣中获得的。硬碳电极具有315 mA-h / g的高可逆容量，表现出卓越的电化学性能。此外，全电池的初始容量HC // NaMn _0.4 Ni _0.4 Ti _0.1 Mg _0.1 O ₂，其为253mA·h / g，80次循环后容量保持率为77％，进一步验证了其实际应用。简单且低成本的制备过程以及出色的电化学性能证明，源自蔗渣的硬碳是钠离子电池的有希望的阳极。