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首页> 外文期刊>Journal of industrial and engineering chemistry >Toward high-performance hard carbon as an anode for sodium-ion batteries: Demineralization of biomass as a critical step
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Toward high-performance hard carbon as an anode for sodium-ion batteries: Demineralization of biomass as a critical step

机译：朝着高性能硬碳作为钠离子电池的阳极：生物质的脱矿作为关键步骤

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Biomass is a promising precursor for producing high-performance hard carbon as an anode for sodium-ion batteries (SIBs) because of its high low-voltage plateau capacity. However, the effect of residual ash in biomass on the electrochemical performance of hard carbons has rarely been investigated. This work describes an effective ash-removal approach as a critical step for preparing high-performance anodes for SIBs. A strong correlation between the ash removal techniques with structural and electrochemical properties of hard carbon was revealed. By examining various ash-removal techniques prior to carbonization and after carbonization using aqueous acid, neutral, and alkaline solutions, it was demonstrated that the removal of ash from raw cocoa pod husk (CPH) using aqueous acid and subsequent carbonization at 1300 degrees C can produce hard carbon with high Na+ ion uptake in the low-voltage plateau region. During the acid pretreatment, ash and some hemicellulose fractions were removed, and carbonization of the acid-treated CPH resulted in hard carbon with a high degree of graphitization and reduced surface area. When tested as an anode in SIBs, the hard carbon produced from the acid-treated CPH exhibited an exceptionally high capacity of 317 mAh g(-1) and high plateau capacity of 244 mAh g(-1) at 0.05 A g(-1), with a high initial Coulombic efficiency of 87%. At a high current density of 250 mA g(-1), a high capacity of 134 mAh g(-1) was maintained after 800 cycles. Post-treatment of hard carbon did not enhance the electrochemical performance. The physicochemical and electrochemical properties of hard carbons produced with the various pre- and post-treatment techniques were presented. (C) 2020 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
机译：生物质是由于其高低压平台容量，因此具有用于生产高性能硬碳作为钠离子电池（SIBS）的阳极的前体。然而，在生物质中对硬碳的电化学性能的影响很少。这项工作描述了一种有效的灰分去除方法，作为用于为SIBS制备高性能阳极的关键步骤。揭示了具有硬碳结构和电化学性能的灰分去除技术与硬碳的电化学性能之间的强相关性。通过在碳化之前的各种灰分去除技术以及使用酸水溶液，中性和碱性溶液碳化之后，证明使用酸水溶液和随后的1300℃的碳化从原料可可荚壳（Cph）中除去灰分在低压平台区域中产生具有高Na +离子吸收的硬碳。在酸预处理中，除去灰分和一些半纤维素级分，并且酸处理的CPH的碳化导致硬碳，具有高度的石墨化和表面积减小。当以SIBs进行阳极测试时，由酸处理的CPH产生的硬碳表现出极高的容量为317mAhg（-1），高平台容量为0.05Ag（-1 ），高初始库仑效率为87％。在高电流密度为250mA g（-1）中，在800次循环后保持高容量为134mAhg（-1）。硬碳后处理没有增强电化学性能。提出了用各种预处理技术产生的硬碳的物理化学和电化学性质。 （c）2020朝鲜工业与工程化学学会。 elsevier b.v出版。保留所有权利。

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