Hollow Multishelled Structural Li-rich Cathode with Al Doping Enabling Capacity and Voltage Stabled Li-ion Batteries

Abstract

Li-rich layered oxide cathode materials have drawn great attention due to their high specific capacity and relatively low cost. However, their implementation is hindered by capacity and discharge voltage decay as well as poor rate performance. Herein, by combining the concepts of geometrical and atomic structure design, hollow multishelled structural Li-rich cathode material doped with aluminum element(Li-rich HoMS-Al) is developed to solve the above challenges. Li-rich HoMS-Al is synthesized through a facile sequential templating approach with the shell number, element molar ratio and Al doping amount accurately controlled. HoMS can effectively buffer the stress/strain during cycling, as well as shorten the ion and electron diffusion path, while Al doping can inhibit the phase transition of the material and reduce the surface oxygen precipitation. As a result, it achieved a high specific capacity, stable voltage and capacity during cycling, exhibiting an initial discharge specific capacity up to 300.6 mA·h·g⁻¹ at 0.1 C(1 C=300 mA/g) and maintaining 246.3 mA·h·g⁻¹ after 100 cycles.

Keywords

Li-rich layered oxide / Hollow multishelled structure / Aluminum doping / Specific capacity / Cycling stability

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