Publication date: 10th April 2024
Heightened attention has been directed towards high entropy materials, owing to their distinct properties as potential battery cell components.[1] Lithium-doped high-entropy oxides (LiHEOs) exemplified by Li0.33(MgCoNiCuZn)0.67O exhibit notable lithium ion and electron conductivity.[2,3] This renders them promising as coating materials for NCM (Lithium-Nickel-Cobalt-Manganese Oxide) in conventional Li-ion battery (LIBs) cells, due to their high ionic and electronic conductivity. However, the stringent conditions and high temperatures required for their synthesis impose limitations on their practical application.
To overcome these challenges, a photonic curing strategy is proposed for the synthesis of LiHEO/HEO (high entropy oxide) materials. This approach successfully yields, for the first time, a nanoscale, homogeneous coating layer on NCM particles.[WO2023/280534 A1] The modified surface of NCM with LiHEO demonstrates exceptional electrochemical cycling stability, exhibiting a noteworthy 91% capacity retention at 1C after 350 cycles. This enhanced electrochemical performance can be attributed to the uniform coating, which effectively mitigates structural changes resulting from the interaction between the electrode active material and electrolyte.
In comparison to the uncoated NCM, the presence of a coating substantially reduces the formation of cracks in secondary particles. This reduction in crack formation prevents the electrolyte from further reacting with primary particles along the cracks. The findings suggest the potential of LiHEO-modified materials as a viable solution for improving the electrochemical performance and cycling stability of high nickel cathode active materials and thereby increasing the cycle life of LIBs. Further, photonic curing presents a novel synthesis and coating procedure for cathode active material particles that paves the way for surface modification of any heat sensitive material for a number of applications using a cost and energy efficient approach.
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