Oxygen-trapping coating pushes EV battery life past 1,000 cycles

Researchers at the University of Arkansas have developed an ultrathin zirconium sulfide (ZrS2) nanoscale coating to significantly extend the lifespan of lithium-ion batteries using the popular NMC811 cathode material (lithium nickel manganese cobalt oxide). NMC811 is valued for its high energy density and cost-effectiveness in electric vehicle (EV) batteries but suffers from oxygen release during repeated charge-discharge cycles. This released oxygen reacts with the electrolyte, producing gases and byproducts that degrade battery performance and pose safety risks. The new 2-nanometer-thick zirconium sulfide coating chemically traps the oxygen by converting into zirconium sulfate, preventing harmful reactions and stabilizing the cathode-electrolyte interface. This protective layer also reduces microcracking and structural damage inside the cathode. Testing showed a dramatic improvement in battery cycle life: while uncoated NMC811 cathodes typically fail after about 200 cycles, the coated cathodes maintained operation beyond 1,