Interfacial nanoarchitectonics of SiOx via CVD carbon coating and vapor-phase polymerized PEDOT for enhanced lithium-ion battery anode performance

IF 5.5 3区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of the Taiwan Institute of Chemical Engineers Pub Date : 2025-04-27 DOI:10.1016/j.jtice.2025.106148

Yu-Sheng Hsiao , Hsueh-Sheng Tseng , Lin-Yang Weng , Sheng-Wei Liao , Jen-Hsien Huang , Wei Kong Pang , Shih-Chieh Hsu , Huei Chu Weng , Yu-Ching Huang

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Abstract

Background

Thanks to the high theoretical capacity, silicon oxides (SiO_x) hold great potential as anode materials for the next-generation high-performance lithium-ion batteries (LIBs). However, the low conductivity and substantial volume fluctuations of SiO_x result in significant polarization and rapid capacity fading, greatly hindering its electrochemical performance and practical application.

Methods

To overcome the inherent challenges of SiO_x, herein, a dual surface modification consisting of a carbon layer and conducting polymer layer is coated on SiO_x. The process involves chemical vapor deposition (CVD) with C₂H₂ as the carbon source, followed by vapor-phase polymerization (VPP) to form high-quality carbon and poly(3,4-ethylenedioxythiophene) (PEDOT) layers on SiO_x.

Significant findings

The dual-modified layers provide the resulting SiO_x with enhanced electrical conductivity and improved structural stability. The modified SiO_x demonstrates a high charge capacity of 1660.1 mAh/g at 0.1C, remarkable rate performance with the charge capacity of 945.0 mAh/g at 3C, and superior cycling span (∼812.7 mAh/g over 200 cycles). In addition, the modified SiO_x demonstrates excellent compatibility with conventional graphite (GP) anode material, significantly enhancing its electrochemical performance.

Abstract Image

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通过CVD碳涂层和气相聚合PEDOT增强锂离子电池负极性能的SiOx界面纳米结构

由于具有较高的理论容量，硅氧化物（SiOx）作为下一代高性能锂离子电池（LIBs）的负极材料具有很大的潜力。然而，SiOx的低电导率和较大的体积波动导致了明显的极化和快速的容量衰减，极大地阻碍了其电化学性能和实际应用。方法为了克服SiOx的固有挑战，在SiOx表面涂覆由碳层和导电聚合物层组成的双重表面改性。该工艺包括以C2H2为碳源的化学气相沉积（CVD），然后通过气相聚合（VPP）在SiOx上形成高质量的碳和聚（3,4-乙烯二氧噻吩）（PEDOT）层。重要发现：双改性层提高了SiOx的导电性和结构稳定性。改性SiOx在0.1C时的充电容量为1660.1 mAh/g，在3C时的充电容量为945.0 mAh/g，具有卓越的倍率性能，并且具有优异的循环时间（200次循环约812.7 mAh/g）。此外，改性SiOx与传统石墨（GP）负极材料具有良好的相容性，显著提高了其电化学性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of the Taiwan Institute of Chemical Engineers 工程技术-工程：化工

CiteScore

9.10

自引率

14.00%

发文量

362

审稿时长

35 days

期刊介绍： Journal of the Taiwan Institute of Chemical Engineers (formerly known as Journal of the Chinese Institute of Chemical Engineers) publishes original works, from fundamental principles to practical applications, in the broad field of chemical engineering with special focus on three aspects: Chemical and Biomolecular Science and Technology, Energy and Environmental Science and Technology, and Materials Science and Technology. Authors should choose for their manuscript an appropriate aspect section and a few related classifications when submitting to the journal online.