SiOC Phase Control and Carbon Nanoribbon Growth by Introducing Oxygen at Atom Level for Lithium-Ion Batteries

Pengfei Wu; Zhicheng Zheng; Benyang Shi; Chao Liu; Shaohong Chen; Binbin Xu; Anhua Liu

doi:10.1002/smtd.202201299

SiOC Phase Control and Carbon Nanoribbon Growth by Introducing Oxygen at Atom Level for Lithium-Ion Batteries

Small Methods. 2022 Dec;6(12):e2201299. doi: 10.1002/smtd.202201299. Epub 2022 Nov 4.

Authors

Pengfei Wu^{1

2

3}, Zhicheng Zheng^{1

2}, Benyang Shi^{1

2}, Chao Liu^{1

4}, Shaohong Chen^{1

2}, Binbin Xu⁵, Anhua Liu^{1

2

4

5

6}

Affiliations

¹ Key Laboratory of High-Performance Ceramic Fibers of Ministry of Education, College of Materials, Xiamen University, Xiamen, 361005, P. R. China.
² Shenzhen Research Institute, Xiamen University, Shenzhen, 518000, P. R. China.
³ Institute for Catalysis (ICAT) and Graduate School of Chemical Sciences and Engineering, Hokkaido University, Sapporo, 001-0021, Japan.
⁴ Fujian Key Laboratory of Advanced Materials, Xiamen University, Xiamen, 361005, P. R. China.
⁵ Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering, Taiyuan, 030000, P. R. China.
⁶ College of Chemistry & Chemical Engineering, Xiamen University, Xiamen, 361005, P. R. China.

PMID: 36333213
DOI: 10.1002/smtd.202201299

Abstract

Poor intrinsic conductivity and the presence of irreversible lithiation phase affect the electrochemical performance of silicon oxycarbide anode materials. Even though it can be improved by increasing free carbon content or composition, scarification of reversible capacity and initial Coulombic efficiency (ICE) remain as challenge. Here, polycarbosilane (PCS) with alternating distribution of silicon and carbon atoms is employed as precursor of SiOC ceramics. Air oxidation cross-linking is used to regulate the content of oxygen and carbon elements in PCS at atom level, so as to explore a solution to improve the intrinsic conductivity and reversible lithium phase content of SiOC ceramics. This strategy provides extremely excellent rate capability, areal/volumetric capacity, and ICE. This is also the first concept for feasible precursor structure design to control the SiOC glass phase and regulate the growth of C nanoribbon that can improve the intrinsic conductivity and reversible capacity of SiOC ceramic anode materials.

Keywords: SiOC fibers; carbon nanoribbons; flexible batteries; high areal capacity; reversible lithiation phase.

Abstract

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