期刊
ADVANCED FUNCTIONAL MATERIALS
卷 32, 期 4, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202108278
关键词
cathode materials; cobalt-free lithium-ion batteries; defect spinel structures; high-power applications; mixed anionic-cationic redox reactions
类别
资金
- PO IR [MNISW/2017/DIR70/II+]
- National Science Centre, Poland [2020/37/N/ST8/02617]
- National Centre for Research and Development, Poland [LIDER/463/L-6/14/NCBR/2015]
- Research University at the Jagiellonian University in Krakow
This paper presents a new type of spinel structure electrode material with high capacity and stability, utilizing fast cation-mediated anionic redox reaction. The material can maintain a high capacity even under high current rates, showing good reversibility in mixed cation-anion redox cathode materials for Li-ion systems.
With ever-increasing energy demand, more efforts are dedicated to designing innovative electrode materials providing higher storage capability and power output. As it has been demonstrated recently, the use of mixed cation-anion redox reactions opens up new possibilities for the significant rise of material's capacity and unusual electrochemical characteristics of lithium-ion battery electrodes. In this paper, a new type of fast cation-mediated anionic redox reaction in the 3D spinel structure is presented. Li0.98K0.01Mn1.86Ni0.11O4 shows 170% of stoichiometric spinel theoretical capacity without voltage hysteresis or significant capacity and voltage fading attributed to limitations of reversible anionic redox. The authors' sol-gel-derived defect spinel structure can deliver 250 mAh g(-1) at 1C and retain 64% of this capacity under a high 50C current rate. The observed electrochemical process shows the reversibility unseen before in mixed cation-anion redox cathode materials for Li-ion systems.
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