Enhancing the lithium ion diffusivity in LiMn2O4−ySy cathode materials through potassium doping

• Published in: Solid state ionics 2018-04, Vol.317, p.190-193
• Main Authors: Bakierska, Monika, Świętosławski, Michał, Chudzik, Krystian, Lis, Marcelina, Molenda, Marcin
• Format: Article
• Language: English
• Subjects: Cathode material; Diffusion coefficient; Doping; High power Li-ion battery; LiMn2O4 spinel
• ISSN: 0167-2738; 1872-7689
• DOI: 10.1016/j.ssi.2018.01.014

High-energy and high-power lithium ion-batteries are essential for future development in large scale energy storage systems to meet all the requirements of modern society. Unfortunately, at present, high-power applications are limited mainly by the diffusion of lithium ions in the solids. This work aims at the improvement of lithium ion diffusivity in one of the most promising cathode material: lithium-manganese spinel (LMO). Herein we are presenting synergetic effect of potassium and sulphur doping of LMO structure. We prove that introduction of small amount of K in the Li sites can enhance effective lithium ion diffusion coefficient and allows material to retain high capacity during very fast charging/discharging processes. •The Li1−xKxMn2O3.99S0.01 with controlled amount of K were successfully synthesized.•DLi+ of K doped spinel (LKMOS) was calculated basing on CV measurements.•LKMOS reviled two times higher DLi+ than undoped LMO.•Enhanced Li+ diffusivity allows LKMOS to retain high capacity under high currents.•Long term charge/discharge studies proved good stability of the material.