High‐Throughput Synthesis of Mn‐Based Disordered Rock‐Salt Li‐Ion Cathodes with Improved Rate Capability via Rapid Joule‐Heating

Abstract Manganese‐based disordered rock‐salt (Mn‐DRX) cathodes provide high energy density and exceptional compositional tunability, which enables the rational design and discovery of advanced DRX chemistries. However, exploration across the vast Mn‐DRX design space remains hindered by the slow and energy‐intensive nature of traditional synthesis methods. Here, the Joule‐heating (JH) method is demonstrated to enable rapid and energy‐efficient synthesis of high‐performance Mn‐DRX cathodes. Through a case study of Li 1.2 Mn 0.4 Ti 0.4 O 2 (LMTO), we show that optimizing DRX materials under rapid synthesis requires controlling both nanoscale short‐range ordering (SRO) and microscale features such as bulk homogeneity and impurity phases, highlighting that microscale features are as critical as SRO. Based on this understanding, we show that a JH‐synthesized LMTO (annealed at 1050 °C just for…