Mesh-like LiZnBO3/C composites as a prominent stable anode for lithium ion rechargeable batteries†
Mesh-like LiZnBO3/C composite was synthesized via a facile polymer pyrolysis method for use as an anode in lithium ion batteries (LIBs), demonstrating high initial capacity (860 mA h g−1) and excellent cycle stability (559 mA h g−1 after 600 cycles at 500 mA g−1 with a capacity retention of 94.47%). Ex situ XRD tests indicate a mixed intercalation–conversion–alloy lithium storage mechanism in the first discharge/charge process of the composite. In addition, the LiZnBO3/C anode was coupled with a commercial LiCoO2 cathode in a full cell, which presented an initial reversible capacity of 658 mA h g−1 at 100 mA g−1 and a capacity of 603 mA h g−1 after 400 cycles with average 0.02% fading in each cycle, which greatly outperforms previously reported compounds; this could be attributed to the unique mesh-like morphology of the composite, which enables high mass transport rate and good conductivity, and the coexistence of LiZnBO3–ZnO–Zn composites that produce a synergistic effect for fast kinetics. This study holds great promise for LIBs with high capacity and good stability.