Hard carbon is the most attractive anode material for electrochemical sodium/potassium-ion storage. The preparation of hard carbon spheres directly from the broad sources of biomass is of great interest but barely reported. Herein, we developed a simple two-step hydrothermal method to construct porous carbon microspheres directly from the original waste biomass of camellia shells. The porous carbon microspheres have high specific capacities of 250 mAh g(-1) and 264.5 mAh g(-1) at a current density of 100 mA g(-1) for sodium-ion batteries and potassium-ion batteries, respectively. And it has excellent cycle stability for sodium ions and potassium ions outperforming most reported hard carbons, which is mainly attributed to the microporous structure and spherical morphology. The work paves a way to prepare porous hard carbon spheres directly from biomass for alkali metal-ion batteries.
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机译：硬碳是电化学钠/钾离子储存中最具吸引力的负极材料。直接从广泛的生物质来源制备硬碳球引起了人们的极大兴趣，但几乎没有报道。在此，我们开发了一种简单的两步水热法，直接从山茶壳的原始废弃生物质中构建多孔碳微球。在100 mA g（-1）的电流密度下，多孔碳微球对钠离子电池和钾离子电池分别具有250 mAh g（-1）和264.5 mAh g（-1）的高比容量。它对钠离子和钾离子具有优异的循环稳定性，优于大多数报道的硬碳，这主要归因于微孔结构和球形貌。这项工作为直接从生物质制备用于碱金属离子电池的多孔硬碳球铺平了道路。
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