Park Jungjin, An Won Young, Lee Keunho, Park Seungman, Bae Minjun, Hwang Seon Jae, Hong Hwichan, Kim Yonghwan, Yoo Taehyun, Kim Dohyeong, Kim Jong Min, Piao Yuanzhe
Graduate School of Convergence Science and Technology, Seoul National University 145 Gwanggyo-ro, Yeongtong-gu Suwon-Si Gyeonggi-do 16229 Republic of Korea
Samsung Electro-Mechanics 150, Maeyeong-ro, Yeongtong-gu Suwon-si Gyeonggi-do 16674 Republic of Korea
RSC Adv. 2024 Sep 20;14(41):29999-30010. doi: 10.1039/d4ra04608k. eCollection 2024 Sep 18.
Silicon oxycarbide (SiOC) is drawing significant attention as a potential anode material for lithium-ion batteries due to its remarkable cycle life and the distinctive Si-O-C hybrid bonding within its structure. However, a notable drawback of SiOC-based electrodes is their poor electrical conductivity. In this study, we synthesized sulfur-doped silicon oxycarbide (S-SiOC) facile one-pot pyrolysis from a mixture of commercial silicone oil with 1-dodecanethiol. Upon testing the S-SiOC electrode materials, we observed significant attributes, including an outstanding specific capacity (650 mA h g at 1 A g), exceptional capacity retention (89.2% after 2000 cycles at 1 A g), and substantial potential for high mass loading of active materials (up to 2.2 mg cm). Sulfur doping led to enhanced diffusivity of lithium ions, as investigated through cyclic voltammetry (CV) and galvanostatic intermittent titration technique (GITT) tests. Consequently, this sulfur-doped silicon oxycarbide, exhibiting excellent electrochemical performance, holds promising potential as an anode material for lithium-ion batteries.
由于其出色的循环寿命以及结构中独特的Si - O - C杂化键，碳氧化硅（SiOC）作为锂离子电池的潜在负极材料正受到广泛关注。然而，基于SiOC的电极存在一个显著缺点，即其导电性较差。在本研究中，我们通过将商业硅油与1 - 十二烷硫醇的混合物进行简便的一锅热解反应，合成了硫掺杂的碳氧化硅（S - SiOC）。在测试S - SiOC电极材料时，我们观察到了显著特性，包括出色的比容量（在1 A g时为650 mA h g）、优异的容量保持率（在1 A g下循环2000次后为89.2%）以及活性材料高质量负载的巨大潜力（高达2.2 mg cm）。通过循环伏安法（CV）和恒电流间歇滴定技术（GITT）测试研究发现，硫掺杂提高了锂离子的扩散率。因此，这种表现出优异电化学性能的硫掺杂碳氧化硅作为锂离子电池的负极材料具有广阔的应用前景。
