As an emerging energy storage technology, potassium-ion batteries (KIBs) are suitable for large-scale energy storage applications due to their abundant resources and low cost, but the known anode materials generally exhibit poor electrochemical performance. In this paper, synthesis of sulfur-doped bamboo charcoal (S-BC) anode materials are carried out to match the intercalation/deintercalation cycles of K⁺ by using biomass bamboo as a precursor and sulfur as a modifying element. Benefiting from the unique structure and composition formed during the activation, carbonization, and subsequently vulcanization at 700 °C, the S-BC materials exhibit stabilized electrochemical performance. The optimized S-BC-1 anode delivers a high specific capacity of 339.3 mAh g⁻¹ at 50 mA g⁻¹, a rate capacity of 124.2 mAh g⁻¹ at 1 A g⁻¹, and a cycling retention of 203.8 mAh g⁻¹ at 200 mA g⁻¹ after 300 cycles. It is indicated that the residual oxygen atoms and the doping sulfur in the BS can provide more active sites and increase the conductivity. The sustainable bamboo is demonstrated to be an environmentally friendly precursor to synthesize the high-performance anode material of KIBs. And it also provides a strategy to stabilize carbon-based anode materials by regulating their structure and composition in the synthetic process.

作为一种新兴的能量存储技术，钾离子电池（KIB）由于其丰富的资源和低成本而适合于大规模的能量存储应用，但是已知的阳极材料通常表现出较差的电化学性能。本文以生物质竹为前驱体，以硫为修饰元素，合成了硫掺杂竹炭（S-BC）阳极材料，以适应K ⁺的嵌入/脱嵌循环。得益于活化，碳化和随后在700°C的硫化过程中形成的独特结构和成分，S-BC材料表现出稳定的电化学性能。经过优化的S-BC-1阳极在50 mA g ^-1时可提供339.3 mAh g ^-1的高比容量，在1 A g ^-1时的额定容量为124.2 mAh g ^-1，在300个循环后在200 mA g ^-1时的循环保持率为203.8 mAh g ^-1。结果表明，BS中的残余氧原子和掺杂硫可以提供更多的活性位点并提高电导率。可持续竹子被证明是环保的前体，可以合成KIBs的高性能阳极材料。并且它还提供了一种策略，可通过在合成过程中调节碳基负极材料的结构和组成来使其稳定。