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          SJTU Researchers Published Research Results in Energy Storage Materials

          February 20, 2020      Author: Qian Guannan, Li Linsen

          Recently, SJTU special researcher Li Linsen, Professor Ma Zifeng and other researchers cooperated with Professor Tang Ming of Rice University and published their latest research results entitled "Single-Crystal Nickel-Rich Layered-Oxide Batteries Category Materials: Synthesis, Electronic Chemistry, and Intra-Granular Fracture" in Energy Storage Materials, a renowned international journal in the field of energy materials. The first author of the paper is Qian Guannan, a doctoral student from the School of Chemistry and Chemical Engineering, SJTU. Li Linsen, Tang Ming and Ma Zifeng are the co-corresponding authors.

          This research is supported by projects including the National Recruitment Program for Distinguished Young Experts, National Natural Science Foundation of China, and Sinoepc Science and Technology Development Fund.

          Abstract

          Electro-mechanical degradation is commonly observed in various battery electrode materials, which are often prepared as polycrystalline particles consisting of nanoscale primary grains. The anisotropic volume change during lithium extraction/insertion makes these materials intrinsically vulnerable to grain-boundary (inter-granular) fracture that leads to rapid impedance growth and capacity decay. Here, guided by fracture mechanics analysis, we synthesize microsized single-crystal Ni-rich layered-oxide (NMC) cathode materials via an industrially-applicable molten-salt approach. Using single-crystal LiNi0.6Mn0.2Co0.2O2 as a model material, we show that the cycle performance of the Ni-rich NMC can be significantly improved by eliminating the internal grain boundaries and inter-granular fracture. The single-crystal LiNi0.6Mn0.2Co0.2O2 cathodes show high specific capacity (183 ?mAh g-1 ?at 0.1 ?C rate, 4.3-2.8 ?V) and excellent capacity retention (94% after 300 cycles at 1C/1C cycling). Further, it is confirmed for the first time that the single-crystal LiNi0.6Mn0.2Co0.2O2 particles are stable against intra-granular fracture as well under normal operating conditions but do crack if severely overcharged. Electrochemical-shock resistant single-crystal NMC reveals an alternative path towards developing better battery cathode materials, beyond the traditional one built upon polycrystalline NMC.

           

          Link: https://doi.org/10.1016/j.ensm.2020.01.027

           

          Translated by Zhou Rong     Reviewed by Wang Bingyu

           
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