Prelithiation of silicon encapsulated in MOF-derived carbon/ZnO framework for high-performance lithium-ion battery

作     者：Liu, Congcong Yang, Yang Yao, Yu Dai, Tao Xu, Shitan Yang, Shoumeng Ali, Ghulam Rui, Xianhong Yu, Yan 

作者机构：Guangdong Provincial Key Laboratory on Functional Soft Condensed Matter School of Materials and Energy Guangdong University of Technology Guangzhou510006 China Hefei National Research Center for Physical Sciences at the Microscale Department of Materials Science and Engineering CAS Key Laboratory of Materials for Energy Conversion University of Science and Technology of China Anhui Hefei230026 China New Material Co. Ltd China U.S.-Pakistan Center for Advanced Studies in Energy National University of Sciences and Technology Islamabad Pakistan 

出 版 物：《Nano Materials Science》 (Nano. Mater. Sci.)

年 卷 期：2024年

核心收录：

基　　金：This work was supported by the National Key R&D Program of China (grant no. 2022YFA1504100)  the Anhui Provincial Major Science and Technology Project (grant no. 202203a05020017)  the National Natural Science Foundation of China (grant nos. 52222210  51925207  U1910210  52161145101  51972067  51902062  and 52002083)  the \u201CTransformational Technologies for Clean Energy and Demonstration\u201D Strategic Priority Research Program of Chinese Academy of Sciences (grant no. XDA21000000)  the National Synchrotron Radiation Laboratory (grant no. KY2060000173)  the Joint Fund of the Yulin University and the Dalian National Laboratory for Clean Energy (grant no. YLU-DNL Fund 2021002)  and the Fundamental Research Funds for the Central Universities (grant no.WK2060140026) 

主　　题：II VI semiconductors 

摘      要：Silicon possesses a high theoretical capacity, making it a potential contender for lithium-ion battery (LIB) anodes. Nonetheless, its practical usage is challenged by low electrical conductivity and significant volume expansion during cycling. Here, we synthesized a novel silicon/carbon (Si/C) anode doped with ZnO via a template-derived method and high-temperature carbonization. The carbon structure, originated from metal-organic frameworks (MOFs) and ZnO doping, substantially enhanced the electrochemical properties of the composite material. It exhibited an initial capacity of 2 100.3 ​mA ​h ​g−1 at a current density of 0.2 ​A ​g−1 and demonstrated excellent capacity retention over successive cycles. Moreover, the composite material displayed superior rate performance at higher current densities of 2 A ​g−1 and 3 ​A ​g−1. To address the low initial Coulombic efficiency (ICE) of silicon-based materials, we adopted a direct contact prelithiation approach and optimized the lithiation process by controlling the prelithiation time. After 30 ​min of prelithiation, the ICE reached 97.9 ​%, thereby reducing the initial irreversible capacity loss (ICL) and realizing stable discharge-charge in subsequent cycles. This rational design provides valuable insights for achieving high-performance silicon anode. © 2024 Chongqing University