Trace Contaminant Induced Lattice Strain and Phase Instability in Recycled High-Nickel Cathodes
Trace impurities in recycled high-nickel cathodes induce lattice strain and microcracking, accelerating capacity fade and raising landed cost per cycle.
High-Nickel NMC811
Meaning
Specific lithium ion battery chemistries utilize a cathode powder where the ratio of nickel to manganese and cobalt is eight to one to one. The adoption of high-nickel nmc811 represents a significant shift toward maximizing energy storage while minimizing the use of cobalt. This stoichiometry offers some of the highest discharge capacities currently available in commercial production.
Energy Advantage
High nickel content directly increases the amount of lithium that can be extracted during the charging process. Because high-nickel nmc811 provides more energy per unit of mass, it is the preferred choice for high performance electric vehicles. This allows for smaller packs that do not compromise on vehicle range.
Cycle Life
Prolonged exposure to high voltages can cause the surface of the particles to become unstable. Managing the cycle life of high-nickel nmc811 involves the use of protective coatings and electrolyte additives. These measures prevent the secondary particles from cracking under the mechanical strain of repeated lithium insertion.
Processing Need
Production of these cells must occur in ultra dry rooms with a dew point below negative forty degrees celsius. The reactive surface of high-nickel nmc811 forms lithium carbonates when exposed to even trace amounts of moisture. This sensitivity increases the complexity and cost of the manufacturing environment.