TY  - JOUR
AU  - Liang, Wenbiao
AU  - Wang, Peng
AU  - Ding, Hao
AU  - Wang, Bo
AU  - Li, Shiyou
PY  - 2021
TI  - Granularity control enables high stability and elevated-temperature properties of micron-sized single-crystal LiNi0.5Mn1.5O4 cathodes at high voltage
JO  - Journal of Materiomics
SN  - 2352-8478
SP  - 1049
EP  - 1060
VL  - 7
IS  - 5
AB  - The development of high energy density LiNi0.5Mn1.5O4 (LNMO) cathode materials for lithium-ion batteries are challenged by capacity degradation, which becomes more aggravated particularly at elevated temperatures. Thus, the practical strategy with facile craft and the viability of large-scale preparation for industrialized applications should be developed urgently. In this work, a micron-sized LNMO single crystals is synthesized by a facile two-step method consisting of an alcohol gel solvent method and a segmented sintering reaction. Results show that the truncated polyhedron LNMO-900 sample, with the moderate D50 characteristic value of 4.429 μm and the highest tap density of 2.31 g cm−3, provides a stable structural and chemical stability even at elevated testing temperature due to its moderate specific surface area and the few Fd-3m phase. The LNMO/Li half-cells display more excellent capacity retention (87.3% at 1C and 25 °C after 500 cycles) and better thermal stability (76.65% at 1C and 55 °C after 200 cycles) than those of the single crystals of LNMO-850 and LNMO-950. Besides, the XPS, in-situ EIS and electrochemical tests results also prove that the LNMO-900 exhibits the lowest electrolyte decomposition degree, owing to a thin and effective solid-electrolyte interfacial film formed after cycles.
UR  - https://doi.org/10.1016/j.jmat.2021.02.003
DO  - 10.1016/j.jmat.2021.02.003