新型炭材料（中英文）2026，Vol.41Issue(4)：961-976,16.DOI:10.1016/S1872-5805(26)61109-2
微米级碳骨架优化实现低膨胀硅碳复合材料并用于高性能锂离子电池
Changing the carbon framework to produce low-expansion silicon-carbon composites for high-performance lithium-ion batteries
摘要
Abstract
Silicon-carbon(Si/C)composites are promising high-capacity anode materials for next-generation lithium-ion batteries,but their commercialization is hindered by their severe volume expansion during cycling.We report a chem-ical vapor deposition method using the pyrolysis of silane,in which ultrafine nano-Si enters a porous carbon framework to produce kilogram-scale Si/C composites.The carbon frame-work with abundant micropores(～1.9 nm),confines the amorphous silicon and accommodates the volume changes of nano-Si during both lithiation and de-lithiation.The res-ulting Si/C composites have a 56.76%Si content and have a specific capacity of 2179 mAh g-1,a high initial Coulombic efficiency(ICE)of 93.5%,and a low specific surface area(1.32 m2 g-1).In addition to the nanoconfinement effect,the median particle size(D50,7.3-13.0 μm)of the carbon framework was shown to control the mechanical strength,coating uni-formity and Li+transport.A D50 of 8.2 μm endows the Si/C composites with outstanding comprehensive properties.They have an excellent rate performance with a 97.0%retention at 3 C relative to 0.1 C,show only minor variations in ICE difference at 60℃/-20℃compared with room temperature,and have a low expansion of 35.8%from the delithiated to the lithiated state.The composite was then mixed with graphite to prepare the anode,which was then paired with an NCM523 cathode to as-semble pouch cells.The pouch cell retained 87.46%of its initial capacity after 1000 cycles at 1 C.Because of the low expan-sion of the electrode,the material avoids structural degradation during cycling and thus has an excellent long-term stability.关键词
硅碳复合材料/纳米空间限域/微米尺度优化/低膨胀/可规模化生产Key words
Si/C composites/Nanoconfinement effect/Micron-scale optimization/Low-expansion/Mass-producible分类
化学化工引用本文复制引用
叶林,黄强,彭工厂,田桂雷,白洪友,周小清,王军阔..微米级碳骨架优化实现低膨胀硅碳复合材料并用于高性能锂离子电池[J].新型炭材料（中英文）,2026,41(4):961-976,16.基金项目
This work was supported by Chengdu Municipal Human Resources and Social Security Bureau and Sichuan Provincial Department of Human Resources and Social Security(TB2024004). 成都市人社局、四川省人社厅资助(TB2024004) （TB2024004）
