Single-source precursors for multiple-function coatings
Degradation of NMC-811 cathodes is a major cause of capacity fade in modern Li-ion cells, and is therefore a bottleneck in their adoption. Coating of particles is intended to slow degradation by limiting electrolyte-active material contact – however, techniques to achieve this at scale are hindered by damaging reaction conditions and inflexibility of element choice.
Researchers at the University of Cambridge have developed a scalable route to coating NMC particles that avoids these problem. Thin, mixed-oxide coatings with excellent elemental homogeneity can now be achieved using single source precursors – a convenient route avoiding high temperatures and aqueous conditions. These form protective barriers surrounding the active material and may stimulate performance improvement via doping, as well as tuning of ion transport and electrolyte barrier properties compared to monometallic equivalents.
This technology offers a real competitive advantage through improved cell lifetime without harsh conditions, alongside a platform for further optimisation.
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