LiMn1.5Ni0.5O4 (LMNO) has a huge potential for use as a cathode material in electric vehicular applications. However, it could face discharge capacity degradation with cycling at elevated temperatures due to attacks by hydrofluoric acid (HF) from the electrolyte, which could cause cationic dissolution. To overcome this barrier, we coated 3-5 micron sized LMNO particles with a ∼3 nm optimally thick and conductive CeO2 film prepared by atomic layer deposition (ALD). This provided optimal thickness for mass transfer resistance, species protection, and mitigation of cationic dissolution at elevated temperatures. After 1,000 cycles of chargedischarge between 3.5 V-5 V (vs. Li+/Li) at 55°C, the optimally coated sample, 50Ce (50 cycles of CeO2 ALD coated) had a capacity retention of ∼97.4%, when tested at a 1C rate, and a capacity retention of ∼83% at a 2C rate. This was compared to uncoated LMNO particles that had a capacity retention of only ∼82.7% at a 1C rate, and a capacity retention of ∼40.8% at a 2C rate.
R. L. Patel et al., "Ultrathin Conductive CeO₂ Coating for Significant Improvement in Electrochemical Performance of LiMn₁.₅Ni₀.₅O₄ Cathode Materials," Journal of the Electrochemical Society, vol. 164, no. 1, pp. A6236 - A6243, The Electrochemical Society (ECS), Jan 2017.
The definitive version is available at https://doi.org/10.1149/2.0371701jes
18th International Meeting on Lithium Batteries (2016: Jun. 19-24, Chicago, IL)
Chemical and Biochemical Engineering
Keywords and Phrases
Cathodes; Dissolution; Electric Discharges; Electrodes; Electrolytes; Hydrofluoric Acid; Lithium Compounds; Mass Transfer; Nickel; Capacity Retention; Cathode Materials; Discharge Capacities; Electrochemical Performance; Elevated Temperature; Mass Transfer Resistances; Optimal Thickness; Vehicular Applications; Atomic Layer Deposition
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Article - Conference proceedings
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01 Jan 2017