Enabling SiOx/C Anode with High Initial Coulombic Efficiency through a Chemical Pre-Lithiation Strategy for High-Energy-Density Lithium-Ion Batteries

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Abstract
Carbon-coated SiOx microparticles (SiOx/C) demonstrate attractive potential for anode use in high energy density lithium-ion batteries due to high capacity and proper cycling stability. However, the excessive irreversible consumption of Li ions during the initial cycling remains a serious challenge arising from the limited lithium in full-cells. Here, we enable SiOx/C anode with high initial Coulombic efficiency by chemical pre-lithiation strategy. The lithium silicate is uniformly pre-generated in SiOx microparticles which could effectively counteract the irreversible consumption of Li ions and avoid the complicate pre-lithiation process. Moreover, this strategy guarantees the structure integrity and processability of anode materials because of the homogeneous Li-organic complex solution pre-lithiation and high-temperature calcination process. The obtained SiOx/C microparticles can be applied as anode materials by directly mixing with commercial graphite which demonstrate proper specific capacity, high initial Coulombic efficiency and excellent cycling performance. Furthermore, the pouch-cells using LiNi0.8Co0.1Mn0.1O2 cathodes and the as-prepared anodes exhibit high energy density (301 Wh kg-1) and satisfactory cycling stability (93.3% capacity retention after 100 cycles).
Funding Information
  • Ministry of Science and Technology of the People's Republic of China (2016YFB0100100)
  • Shandong Province
  • Chinese Academy of Sciences (XDA21070300)
  • Innovation team for Research and Development and industrialization of High Energy Density Si-based Power batteries (2018607219003)

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