阳极
亚氧化物
材料科学
法拉第效率
复合数
阴极
硅
锂(药物)
化学工程
碳纤维
电池(电)
图层(电子)
纳米技术
锂离子电池
电极
光电子学
复合材料
化学
工程类
物理
内分泌学
物理化学
功率(物理)
医学
量子力学
作者
Zhenhui Liu,Rui Hu,Ruohan Yu,Mingbo Zheng,Yulin Zhang,Xuanning Chen,Laifa Shen,Yongyao Xia
出处
期刊:Nano Letters
[American Chemical Society]
日期:2024-04-10
标识
DOI:10.1021/acs.nanolett.4c00469
摘要
The practical application of microsized anodes is hindered by severe volume changes and fast capacity fading. Herein, we propose a gradient composite strategy and fabricate a silicon suboxide-based composite anode (d-SiO@SiOx/C@C) consisting of a disproportionated microsized SiO inner core, a homogeneous composite SiOx/C interlayer (x ≈ 1.5), and a highly graphitized carbon outer layer. The robust SiOx/C interlayer can realize a gradient abatement of stress and simultaneously connect the inner SiO core and carbon outer layer through covalent bonds. As a result, d-SiO@SiOx/C@C delivers a specific capacity of 1023 mAh/g after 300 cycles at 1 A/g with a retention of >90% and an average Coulombic efficiency of >99.7%. A full cell assembled with a LiNi0.8Co0.15Al0.05O2 cathode displays a remarkable specific energy density of 569 Wh/kg based on total active materials as well as excellent cycling stability. Our strategy provides a promising alternative for designing structurally and electrochemically stable microsized anodes with high capacity.
科研通智能强力驱动
Strongly Powered by AbleSci AI