Carbon coating and Al-doping to improve the electrochemistry of Li₂CoSiO₄ polymorphs as cathode materials for lithium-ion batteries.

ABSTRACT: Li₂CoSiO₄ has the potential for use as a high safety, high energy-density cathode material for lithium-ion batteries but suffers from bad electrochemical performance. Herein, we demonstrate a profound study on the effects of carbon coating and Al-doping on the electrochemistry of Li₂CoSiO₄ synthesized by a two-step method. The synthesized 4 at% Al-doped Li₂CoSiO₄/C allows two lithium removals between 2.5 and 4.6 V, showing a first charge and discharge capacity of 331 and 140 mA h g^-1, respectively, and a high capacity retention in cycling with no voltage degradation. The relationship between the improved performance and the supporting structural characteristics was studied by galvanostatic charge/discharge measure

SUBMITTER: Du H 

PROVIDER: S-EPMC9081380 | biostudies-literature | 2018 Jun

REPOSITORIES: biostudies-literature