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

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

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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 instabil-ity 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 to 658 MPa,Young's modulus:11.6 GPa).This strength effectively accommodates silicon expansion,result-ing in an impressive areal capacity of 2.9 mA h cm-2(736 mA h g-1)and a steady cycle life(93％after 100 cycles).Such outstanding performance is paired with features appropriate for large-scale industrial pro-duction of silicon batteries,such as active mass loading of at least 3.9 mg cm-2,a high-tap density elec-trode 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.

Lithium-ion batterySilicon anodeSpark plasma sinteringInterlayer bondingMechanical strengthTap density

Wenhui Lai、Jong Hak Lee、Lu Shi、Yuqing Liu、Yanhui Pu、Yong Kang Ong、Carlos Limpo、Ting Xiong、Yifan Rao、Chorng Haur Sow、Barbaros ?zyilmaz

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Department of Material Science & Engineering,National University of Singapore,Singapore 117575,Singapore

Center for Advanced 2D Materials,National University of Singapore,Singapore 117546,Singapore

Department of Physics,National University of Singapore,Singapore 117551,Singapore

Institute for Functional Intelligent Materials,National University of Singapore,Singapore 117544,Singapore

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National Research Foundation,Prime Minister's Office,Singapore,under its Competitive Research ProgrammeMedium-Sized Centre ProgrammeMinistry of Education of Singapore,under its Research Centre of Excellence award to the Institute for Functional IntelligentEDB Singapore,under its Space Technology Development Programme

NRF-CRP22-2019-008CA2DMEDUNC-33-18-279-V12S22-19013-STDP

2024

10.1016/j.jechem.2024.02.021

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.93(6)
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