The synthesis of precursors for lithium- and manganese-rich xLi₂MnO₃•(1-x)LiMO₂ (M = Ni, Mn, Co) (LMR-NMC) materials is generally carried out via co-precipitation using a continuously stirred tank reactor (CSTR) under steady-state conditions. But during the early stages of research (e.g., when screening compositional spaces of interest), using a CSTR in steady-state mode can be time consuming and wasteful. An alternative is to operate the reactor in semi-batch mode, which shortens reaction times and reduces the amount of waste. However, the effect of this mode on the product is not well documented. The present work investigates how several process variables affect the physical properties of Mn-rich NMC carbonate precursors prepared under semi-batch operation of a CSTR. The process variables examined are pH, ammonia concentration of feed solution, process temperature, stirring speed, and reaction time. The results can help guide research-scale production to support efficient development of Mn-rich carbonates for cathode oxides.

富锂和锰的xLi ₂ MnO ₃ •（1-x）LiMO ₂的前体的合成（M = Ni，Mn，Co）（LMR-NMC）材料通常是在稳态条件下使用连续搅拌釜式反应器（CSTR）通过共沉淀进行的。但是在研究的早期阶段（例如，筛选感兴趣的合成空间时），在稳态模式下使用CSTR可能既耗时又浪费。另一种选择是在半间歇模式下运行反应器，这可以缩短反应时间并减少废物量。但是，此模式对产品的影响没有得到很好的记录。本工作研究了几种工艺变量如何影响在CSTR半间歇操作下制备的富锰NMC碳酸盐前体的物理性能。检查的过程变量是pH，进料溶液的氨浓度，过程温度，搅拌速度和反应时间。