Liang Weijie, Weng Chongwei, Wang Le, Zhan Jinbei, Zhang Hui, Feng Yefeng, Xiong Deping, Feng Zuyong, He Miao
School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, China.
Guangzhou Qingbei Intelligent Technology Co, LTD, Guangzhou 510080, China.
Langmuir. 2025 Jul 15;41(27):18152-18165. doi: 10.1021/acs.langmuir.5c02098. Epub 2025 Jul 2.
Biomass-derived hard carbon (HC) materials, celebrated for their superior sodium storage capability and economic viability, have emerged as a promising candidate for anode materials in sodium-ion batteries (SIBs). However, the electronic conductivity, cycling stability, and initial Coulombic efficiency (ICE) of HC materials remain significant challenges hindering their broader application. In this study, we successfully developed a HC anode material using Indian trumpetflower seeds (ITS) as precursors, enhanced by coating with pitch on their surface. This ITS-based HC material not only delivers an impressive reversible capacity of 430.3 mAh g @ 300 mA g but also maintains a capacity retention of 63% at a current density of 1500 mA g, along with a remarkable ICE of 90.92%. After 900 cycles, the capacity retention remains high at 77%, demonstrating exceptional cycling stability. These performance enhancements are attributed to the appropriate concentration of carbonized oxygen-doped pitch (CODP) coating, which avoids direct contact between the electrolyte and ITS and introduces oxygen atoms to provide more active sites. This work not only provides a promising precursor for the fabrication of high-performance HC anodes for SIBs but also introduces an innovative synthetic strategy, injecting momentum into the commercialization process of SIBs.
生物质衍生的硬碳（HC）材料因其卓越的钠存储能力和经济可行性而备受赞誉，已成为钠离子电池（SIBs）负极材料的一个有前途的候选者。然而，HC材料的电子导电性、循环稳定性和初始库仑效率（ICE）仍然是阻碍其更广泛应用的重大挑战。在本研究中，我们成功地开发了一种以印度喇叭花种子（ITS）为前驱体的HC负极材料，并通过在其表面涂覆沥青来增强性能。这种基于ITS的HC材料不仅在300 mA g的电流密度下提供了令人印象深刻的430.3 mAh g的可逆容量，而且在1500 mA g的电流密度下保持了63%的容量保持率，同时具有90.92%的显著ICE。经过900次循环后，容量保持率仍高达77%，显示出优异的循环稳定性。这些性能提升归因于碳化氧掺杂沥青（CODP）涂层的适当浓度，它避免了电解质与ITS之间的直接接触，并引入氧原子以提供更多活性位点。这项工作不仅为制造用于SIBs的高性能HC负极提供了一种有前途的前驱体，而且还引入了一种创新的合成策略，为SIBs的商业化进程注入了动力。
