A Novel Bifunctional Self-Stabilized Strategy Enabling 4.6 V LiCoO₂ with Excellent Long-Term Cyclability and High-Rate Capability.

ABSTRACT: Although the theoretical specific capacity of LiCoO₂ is as high as 274 mAh g^-1, the superior electrochemical performances of LiCoO₂ can be barely achieved due to the issues of severe structure destruction and LiCoO₂/electrolyte interface side reactions when the upper cutoff voltage exceeds 4.5 V. Here, a bifunctional self-stabilized strategy involving Al+Ti bulk codoping and gradient surface Mg doping is first proposed to synchronously enhance the high-voltage (4.6 V) performances of LiCoO₂. The comodified LiCoO₂ (CMLCO) shows an initial discharge capacity of 224.9 mAh g^-1 and 78% capacity retention after 200 cycles between 3.0 and 4.6 V. Excitingly, the CMLCO also exhibits a specific capacity of up to 142 mAh g

SUBMITTER: Wang L 

PROVIDER: S-EPMC6662074 | biostudies-literature | 2019 Jun

REPOSITORIES: biostudies-literature