Yun Jae Hyeon, Whang Tae Kyung, Ahn Won Jun, Lee Young-Seak, Im Ji Sun
C1 Gas & Carbon Convergent Research, Korea Research Institute of Chemical Technology (KRICT) 141 Gajeong-ro Yuseong-Gu Daejeon 34114 Republic of Korea
Department of Chemical Engineering and Applied Chemistry, Chungnam University 99 Daehak-ro Yuseong-gu Daejeon 34134 Republic of Korea.
RSC Adv. 2022 Feb 24;12(11):6552-6560. doi: 10.1039/d1ra08901c. eCollection 2022 Feb 22.
To increase the energy density of today's batteries, studies on adding Si-based materials to graphite have been widely conducted. However, adding a Si-based material in the slurry mixing step suffers from low distribution due to the self-aggregation property of the Si-based material. Herein, a hierarchical structure is proposed to increase the integrity by using APS to provide a bonding effect between graphite and SiO . Additionally, to endow a protection layer, carbon is coated on the surface using the CVD method. The designed structure demonstrates enhanced integrity based on electrochemical performance. The MSG (methane decomposed SiO @G) electrode demonstrates a high ICE of 85.6% with 429.8 mA h g initial discharge capacity. In addition, the MSG anode has superior capacity retention (89.3%) after 100 cycles, with enhanced volumetric expansion (12.7%) after 50 cycles. We believe that the excellent electrochemical performance of MSG is attributed to increased integrity by using APS (3-aminopropyltrimethoxysilane) with a CVD carbon coating.
为了提高当今电池的能量密度，已广泛开展了在石墨中添加硅基材料的研究。然而，由于硅基材料的自聚集特性，在浆料混合步骤中添加硅基材料时存在分布不均的问题。在此，提出一种分级结构，通过使用APS来增强石墨与SiO 之间的结合作用，从而提高整体性。此外，为了赋予其保护层，采用化学气相沉积（CVD）法在表面包覆碳。基于电化学性能，所设计的结构表现出增强的整体性。MSG（甲烷分解SiO @G）电极在初始放电容量为429.8 mA h g时，具有85.6%的高首次库伦效率（ICE）。此外，MSG阳极在100次循环后具有优异的容量保持率（89.3%），在50次循环后体积膨胀增强（12.7%）。我们认为，MSG优异的电化学性能归因于使用带有CVD碳涂层的APS（3-氨丙基三甲氧基硅烷）提高了整体性。
