1 research outputs found
<i>In Situ</i> Co-modification Strategy for Achieving High-Capacity and Durable Ni-Rich Cathodes for High-Temperature Li-Ion Batteries
Operating Li-ion batteries in a harsh environment will
greatly
degrade the cyclic performance and safety of Ni-rich layered cathodes,
which challenges the current modification approaches to form a more
stable interface with the electrolyte and a robust crystal structure.
Herein, we demonstrate the surface engineering enabling V-doped and
ZrV2O7-coated Ni-rich layered cathodes (V-NCM@ZVO),
where stoichiometric ZVO generates on the surface of oxides and tailorable
V subsequently diffuses into the bulk phase during high-temperature
lithiation. The introduction of high-energy V–O bonds vastly
refrains the lattice oxygen escape, and meantime, ionic conductive
and electrochemically inert ZVO ensures a robust interphase on the
Ni-rich cathode, greatly enhancing the thermal stability. At 55 °C,
the modified cathode displays a high reversible capacity of 220.3
mAh g–1 at 0.2 C and 183.0 mAh g–1 at 10 C. More impressively, the assembled V-NCM@ZVO//graphite pouch-type
cell exhibits a capacity retention of 90.2% at 1 C after 400 cycles
at 55 °C. This work exhibits a feasible modification strategy
to strengthen the surface and crystal stability in parallel of Ni-rich
cathodes to meet high-temperature Li-ion batteries