文献类型：期刊文献

中文题名：A sandwich rGO/Si/rGO material as a high-performance anode material for lithium-ion batteries

英文题名：用于高性能锂离子电池的三明治状石墨烯/硅/石墨烯复合材料

作者：LI Shu-chun[1];ZHU Shuai-bo[1];MA Cheng[1];WANG Ji-tong[1];QIAO Wen-ming[1];ZHANG Yin-xu[2]

机构：[1]State Key Laboratory of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China;[2]Hesheng Silicon Industry(Shanshan)Co.Ltd,Xinjiang 838200,China

年份：2025

卷号：40

期号：6

起止页码：1304

中文期刊名：新型炭材料(中英文)

外文期刊名：New Carbon Materials

收录：;北大核心:【北大核心2023】；

基金：国家自然科学基金(22178107,U21A2060);新疆维吾尔自治区重点研发计划(2022B01030).

语种：英文

中文关键词：Lithium-ion batteries;Reduced graphene oxide;Sandwich structure;Silicon anode

外文关键词：锂离子电池;还原氧化石墨烯;三明治结构;硅负极

摘要：Silicon-based materials have attracted considerable attention as potential anodes in lithium-ion energy storage systems,primarily due to their having a theoretical capacity greater than conventional graphite anodes.Despite this advantage,the inherent problem of substantial volume changes during lithiation/delithiation severely hinders their practical implementation in commercial battery configurations.We report the synthesis of a material by an electrostatic self-assembly method in which citric acid(CA)serves as a crosslinker to anchor cetyltrimethylammonium bromide-modified positively charged silicon nanoparticles between graphene oxide(GO)layers.After freeze-drying and thermal treatment under a nitrogen atmosphere,silicon particle core layers sandwiched between reduced graphene oxide(rGO)layers were obtained.Control samples with Si/rGO mass ratios of 0.5,1 and 2 were prepared for evaluation.The continuous conductive rGO network significantly increased the electronic conductivity of the material and the incorporation of CA acted as a binding agent between the Si and the rGO which increased the structural stability.By anchoring the silicon particles between adjacent rGO layers,the abundant void spaces and favorable mechanical flexibility of rGO were harnessed to effectively alleviate the volume expansion of silicon during charge-discharge cycles.The material with the Si/rGO mass ratio of 1 gave the highest specific capacity of 946.6 mAh g^(?1)after 200 cycles at a current density of 0.5 A g^(?1).It also had a good rate performance,with a good reversible capacity of 1005.1 mAh g^(?1)at a high current density of 2 A g^(?1).
硅基材料作为锂离子储能系统中极具潜力的负极,因其远超传统石墨负极的理论容量而备受瞩目。然而,硅基负极在锂化/脱锂中固有的剧烈体积变化问题,严重制约了其在商业化电池中的实际应用。通过简单的静电自组装方法,以柠檬酸(CA)作为交联剂,将经十六烷基三甲基溴化铵修饰的正电硅纳米颗粒嵌入到氧化石墨烯(GO)层间中,经冷冻干燥及氮气氛围下热处理后制得由硅颗粒核层夹嵌在还原氧化石墨烯(rGO)层间中的一种材料,并基于不同Si/rGO质量比(0.5,1和2)制备了对照样品。连续的导电rGO网络显著提高了材料整体的导电性,CA作为硅与rGO之间的黏合剂,增加了结构的稳定性。通过将硅颗粒锚定在相邻的rGO层间,充分利用rGO层间丰富的空隙和良好的机械柔韧性,有效缓解了硅在充放电过程中的体积膨胀。Si/rGO质量比为1的复合材料在0.5 A g^(?1)的电流密度下循环200圈后,比容量维持在946.6 mAh g^(?1),同时表现出良好的倍率性能,在2 A g^(?1)的高电流密度下,仍然可以保留1005.1 mAh g^(?1)的高比容量。