Green biomass: the impact of high-adhesion and well-dispersed binders on the sodium storage performance and interfacial interaction of hard carbon anodes†
Jiaqi Jiao , Conghua Yi , Xueqing Qiu , Dongjie Yang , Fangbao Fu , Weifeng Liu
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引用次数: 0
Abstract
Hard carbon (HC) exhibits promising potential as an anode material for sodium-ion batteries; however, it is confronted with challenges such as low initial coulombic efficiency (ICE) and poor rate performance. Developing biomass-based binders is a significant strategy to promote electrochemical performance and improve the stability of the solid electrolyte interface (SEI). In this work, green biomass of carboxymethyl cellulose (CMC) and sodium lignosulfonate (LS) with excellent adhesion and dispersibility is demonstrated as an efficient binder for hard carbon anodes. The semi-rigid skeleton of LS effectively wraps the hard carbon particles, surface modifies HC, and fills defects. The polar functional groups of the binder facilitate the adsorption of Na+ and reduce irreversible Na+ insertion. Furthermore, the functional groups induce the formation of a unique SEI layer. The SEI layer consists of an organic outer layer and an inorganic inner layer, promoting ion transport and mechanical integrity. Therefore, the HC anode with the CMC/LS binder demonstrates a high reversible capacity of 348 mA h g−1 at 0.05 A g−1, a high ICE of 87%, and an outstanding rate performance with 243 mA h g−1 at 5 A g−1.
硬碳(HC)作为钠离子电池的阳极材料具有广阔的发展前景,但它也面临着初始库仑效率(ICE)低和速率性能差等挑战。开发基于生物质的粘合剂是促进电化学性能和提高固体电解质界面(SEI)稳定性的重要策略。在这项研究中,羧甲基纤维素(CMC)和木质素磺酸钠(LS)的绿色生物质被证明是硬碳阳极的高效粘合剂,具有优异的粘附性和分散性。LS 的半刚性骨架可有效包裹硬碳颗粒、表面改性碳氢化合物并填充缺陷。粘合剂的极性官能团可促进 Na+ 的吸附,减少 Na+ 的不可逆插入。此外,官能团还能诱导形成独特的 SEI 层。SEI 层由有机外层和无机内层组成,可促进离子传输和机械完整性。因此,使用 CMC/LS 粘合剂的碳氢化合物阳极在 0.05 A g-1 的条件下具有 348 mA h g-1 的高可逆容量,ICE 高达 87%,并且在 5 A g-1 的条件下具有 243 mA h g-1 的出色速率性能。
期刊介绍:
Green Chemistry is a journal that provides a unique forum for the publication of innovative research on the development of alternative green and sustainable technologies. The scope of Green Chemistry is based on the definition proposed by Anastas and Warner (Green Chemistry: Theory and Practice, P T Anastas and J C Warner, Oxford University Press, Oxford, 1998), which defines green chemistry as the utilisation of a set of principles that reduces or eliminates the use or generation of hazardous substances in the design, manufacture and application of chemical products. Green Chemistry aims to reduce the environmental impact of the chemical enterprise by developing a technology base that is inherently non-toxic to living things and the environment. The journal welcomes submissions on all aspects of research relating to this endeavor and publishes original and significant cutting-edge research that is likely to be of wide general appeal. For a work to be published, it must present a significant advance in green chemistry, including a comparison with existing methods and a demonstration of advantages over those methods.