High mechanical strength Si anode synthesis with interlayer bonded expanded graphite structure for lithium-ion batteries  

作　　者：Wenhui Lai Jong Hak Lee Lu Shi Yuqing Liu Yanhui Pu Yong Kang Ong Carlos Limpo Ting Xiong Yifan Rao Chorng Haur Sow Barbaros Ozyilmaz 

机构地区：[1]Department of Material Science&Engineering,National University of Singapore,Singapore 117575,Singapore [2]Center for Advanced 2D Materials,National University of Singapore,Singapore 117546,Singapore [3]Department of Physics,National University of Singapore,Singapore 117551,Singapore [4]Institute forFunctional Intelligent Materials,National University of Singapore,Singapore 117544,Singapore

出　　处：《Journal of Energy Chemistry》2024年第6期253-263,I0007,共12页能源化学（英文版）

基　　金：supported by the National Research Foundation, Prime Minister’s Office, Singapore, under its Competitive Research Programme (CRP award number NRF-CRP22-2019-008);Medium-Sized Centre Programme (CA2DM);the Ministry of Education of Singapore, under its Research Centre of Excellence award to the Institute for Functional Intelligent Materials (I-FIM, Project No. EDUNC-33-18-279-V12);by the EDB Singapore, under its Space Technology Development Programme (S2219013-STDP)。

摘　　要：Despite advancements in silicon-based anodes for high-capacity lithium-ion batteries,their widespread commercial adoption is still hindered by significant volume expansion during cycling,especially at high active mass loadings crucial for practical use.The root of these challenges lies in the mechanical instability of the material,which subsequently leads to the structural failure of the electrode.Here,we present a novel synthesis of a composite combining expanded graphite and silicon nanoparticles.This composite features a unique interlayer-bonded graphite structure,achieved through the application of a modified spark plasma sintering method.Notably,this innovative structure not only facilitates efficient ion and electron transport but also provides exceptional mechanical strength(Vickers hardness:up to658 MPa,Young's modulus:11.6 GPa).This strength effectively accommodates silicon expansion,resulting in an impressive areal capacity of 2.9 mA h cm^(-2)(736 mA h g^(-1)) and a steady cycle life(93% after 100cycles).Such outsta nding performance is paired with features appropriate for large-scale industrial production of silicon batteries,such as active mass loading of at least 3.9 mg cm^(-2),a high-tap density electrode material of 1.68 g cm^(-3)(secondary clusters:1.12 g cm^(-3)),and a production yield of up to 1 kg per day.

关 键 词：Lithium-ion battery Silicon anode Spark plasma sintering Interlayer bonding Mechanical strength Tap density 

分 类 号：TQ127.2[化学工程—无机化工] TM912[电气工程—电力电子与电力传动]