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High-Performance Li-Ion Batteries Using Nickel-Rich Lithium Nickel Cobalt Aluminium Oxide–Nanocarbon Core–Shell Cathode: In Operando X‑ray Diffraction
journal contribution
posted on 2019-08-13, 20:29 authored by Selvamani Vadivel, Nutthaphon Phattharasupakun, Juthaporn Wutthiprom, Salatan duangdangchote, Montree SawangphrukNickel-rich layered,
mixed lithium transition-metal oxides have
been pursued as a propitious cathode material for the future-generation
lithium-ion batteries due to their high energy density and low cost.
Nevertheless, acute side reactions between Ni4+ and carbonate
electrolyte lead to poor cycling as well as rate performance, which
limits their large-scale applications. Here, core–shell like
LiNi0.8Co0.15Al0.05O2 (NCA)–carbon
composite synthesized by a solvent-free mechanofusion method is reported
to solve this issue. Such a core–shell structure exhibits a
splendid rate as well as stable cycling when compared to the physically
blended NCA. In operando X-ray diffraction studies
show that both materials experience anisotropic structural change,
i.e., stacking c-axis undergoes a gradual expansion
followed by an abrupt shrinkage; meanwhile, the a-axis contracts during the charging process and vice versa. Interestingly,
the core–shell material displays a significantly high reversible
capacity of 91% in the formation cycle at 0.1C and a retention of
84% at 0.5C after 250 cycles, whereas pristine NCA retains 71%. The
robust mechanical force assisted dry coating obtained by the mechanofusion
method shows improved electrochemical performance and demonstrates
its practical feasibility.
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High-Performance Li-Ion Batteries0.1 Cmechanofusion method250 cycles0.5 Ccoreside reactionselectrochemical performanceformation cyclecarbonate electrolyteLiNi 0.8 Co 0.15 Al 0.05 O 2cyclingenergy densitysolvent-free mechanofusion methodrate performancefuture-generation lithium-ion batteriescathode materialoperando X-ray diffraction studies showaxis contractsmaterials experience anisotropiclithium transition-metal oxidesNCA
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