A Facile Carbon Coating on Mg‐Embedded SiOx Alloy for Fabrication of High‐Energy Lithium‐Ion Batteries

Abstract

AbstractThe use of SiOx‐containing anode materials to increase the energy density limited by the utilization of low gravimetric specific capacity commercial graphite has recently received great interest. However, a low initial Coulombic efficiency and other inherent disadvantages of SiOx such as huge volume changes and poor electron transportation result in complicating its widespread use. To overcome these issues herein, a simple, cost‐effective, and mass‐producible phenolic resin‐coated Mg‐SiOx anode composite for high‐performance lithium‐ion batteries compared to the carbon film produced by the chemical vapor deposition method is designed. Carbon‐coated Mg‐SiOx based on the phenolic resin is found to act as a direct contact protection electrolyte–electrode interface and boosts kinetics of Li+ transport among the electrodes, ensuring the formation of stable solid electrolyte interphase upon cycling. As a result, the phenolic resin‐coated Mg‐SiOx alloy electrode delivers a stable specific capacity up to ≈1700 mAh g‐1 after 100 cycles. Testing with an industrial protocol, a full cell pairing of the Mg‐SiOx@C/graphite blended anode and commercial LiNi0.8Mn0.1Co0.1O2 cathode achieves a gravimetric and volumetric energy density of 467 Wh Kg‐1 and 953 Wh L‐1, respectively, which is higher than that of the cell based on the conventional graphite.