Статья

A Micrometer‐Sized Silicon/Carbon Composite Anode Synthesized by Impregnation of Petroleum Pitch in Nanoporous Silicon

Sujong ChaeDepartment of Industrial Chemistry Pukyong National University Busan 48513 Republic of KoreaYaobin XuEnvironmental Molecular Sciences LaboratoryRan YiEnergy and Environment Directorate Pacific Northwest National Laboratory Richland WA 99354 USAHyung‐Seok LimEnergy and Environment Directorate Pacific Northwest National Laboratory Richland WA 99354 USADušan VeličkovićEnvironmental Molecular Sciences Laboratory Pacific Northwest National Laboratory 902 Battelle Boulevard Richland WA 99352 USAXiaolin LiEnergy and Environment Directorate Pacific Northwest National Laboratory Richland WA 99354 USAQiuyan LiEnergy and Environment Directorate Pacific Northwest National Laboratory Richland WA 99354 USAChongmin WangEnvironmental Molecular Sciences Laboratory Pacific Northwest National Laboratory 902 Battelle Boulevard Richland WA 99352 USAJi‐Guang ZhangEnergy and Environment Directorate Pacific Northwest National Laboratory Richland WA 99354 USA

2021en

ABI

Аннотация

Abstract Porous silicon (Si)/carbon nanocomposites have been extensively explored as a promising anode material for high‐energy lithium (Li)‐ion batteries (LIBs). However, shrinking of the pores and sintering of Si in the nanoporous structure during fabrication often diminishes the full benefits of nanoporous Si. Herein, a scalable method is reported to preserve the porous Si nanostructure by impregnating petroleum pitch inside of porous Si before high‐temperature treatment. The resulting micrometer‐sized Si/C composite maintains a desired porosity to accommodate large volume change and high conductivity to facilitate charge transfer. It also forms a stable surface coating that limits the penetration of electrolyte into nanoporous Si and minimizes the side reaction between electrolyte and Si during cycling and storage. A Si‐based anode with 80% of pitch‐derived carbon/nanoporous Si enables very stable cycling of a Si||Li(Ni0.5Co0.2Mn0.3)O 2 (NMC532) battery (80% capacity retention after 450 cycles). It also leads to low swelling in both particle and electrode levels required for the next generation of high‐energy LIBs. The process also can be used to preserve the porous structure of other nanoporous materials that need to be treated at high temperatures.

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Идентификаторы

DOI: 10.1002/adma.202103095

Цитирования и источники

Цитирований: 2Использованных источников: 0

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