High-performance electrode materials with intelligent design hold the promise for the development of lithium ion batteries regarding high energy density and long cycling life. Herein, we report an artificial solid electrolyte interphase (SEI) modified porous SiO_x anode (P-SiO_x) prepared by a facile in-situ polymerization of tannin (PTN) under alkaline condition, forming an elastic polymer layer surrounding P-SiO_x particles. The as-prepared P-SiO_x@PTN composite demonstrates higher initial Coulombic efficiency (ICE) and stronger mechanical property than the P-SiO_x. Consequently, the outer elastic and electric buffer layer ensures the composite showing a high reversible capacity of 1616 mAh g⁻¹ at 0.1 C and exceptional long-term cycling performance. Moreover, when coupled with LiNi_0.8Mn_0.1Co_0.1O₂ cathode, high reversible capacity (123 mAh g⁻¹) and good capacity retention (83 mAh g⁻¹ after 300 cycles) at 0.5 C are achieved. This facile method constructing the artificial solid electrolyte interphase with enhanced mechanical and electrochemical properties by the in-situ PTN is of great promise for Si-based anode materials.

具有智能设计的高性能电极材料为锂离子电池的高能量密度和长循环寿命提供了发展前景。本文中，我们报告了一种在碱性条件下通过单宁（PTN）的简单原位聚合制备的人工固体电解质相间（SEI）改性多孔SiO _x阳极（P-SiO _x），形成了围绕P-SiO _x的弹性聚合物层粒子。所制备的P-的SiO _X @PTN复合表明较高的初始库仑效率（ICE）和更强的机械性能比P的SiO _X。因此，外部弹性和电缓冲层可确保复合材料显示出1616 mAh g ^-1的高可逆容量在0.1 C下具有出色的长期循环性能。此外，当与LiNi _0.8 Mn _0.1 Co _0.1 O ₂阴极结合时，在0.5 C下可获得高可逆容量（123 mAh g ^-1）和良好的容量保持率（300次循环后83 mAh g ^-1）。这种通过原位PTN构造具有增强的机械和电化学性能的人造固体电解质中间相的简便方法对于Si基负极材料具有广阔的前景。