Hydrogen Reduction of LiCoO2 Cathode Material: Thermodynamic Analysis, Microstructure, and Mechanisms

Abstract Hydrogen is an alternative reductant to replace carbon for the production of metals. Reduction by hydrogen has advantages compared carbothermic reduction, such as faster reaction rate and cleaner by-product (water vapor). This study investigated application reduction recycling recovering cobalt lithium from Li-ion battery cathode material (LiCoO 2 ). The consisted thermodynamic simulations reactions microstructure evolution analysis experimental work propose mechanisms process. assessment predicted that metallic Co could be generated 400 °C was stable up 1200 °C, but strongly dependent on molar amount H . final products were found vary Li O, LiOH, O Co, CoO, 3 4 , respectively. revealed overall mechanism uniquely characterized temperature. temperature range 800 900 offered more benefit a larger mass indicating progressive reduction. data information obtained can help optimize parameters in batteries.