Semi-continuous centrifugation is suggested as promising method to separate battery active materials from aqueous multi-component agglomerate dispersions. This is of special interest for direct recycling of active materials from decommissioned lithium-ion batteries. The separation of lithium iron phosphate (LFP) from carbon black C65 could be achieved with separation efficiencies of 90–100 % for LFP and 40–90 % for C65. The working parameters of the centrifuge, namely volumetric flow rate and rotational speed, were varied within a design of experiments study to find an optimum at 65 mL min⁻¹ and 20,000 rpm, where at least 97 % of the LFP is separated in the centrifuge, while as much C65 as possible is pushed into the centrate. Furthermore, the separation mechanism was discussed by analyzing particle size distributions and the sediment build-up. High rotational speeds and low volumetric flow rates lead to significant radial and axial gradients in terms of carbon content in the sediment. LFP that was extracted from the sediment after centrifugation at the optimum conditions exhibited 98 % of the initial specific capacity.

建议半连续离心是将电池活性物质与含水多组分团聚物分散体分离的有前途的方法。这对于从退役的锂离子电池中直接回收活性物质特别有意义。炭黑C65分离磷酸铁锂（LFP）的效率为LFP为90–100％，C65为40–90％。离心机的工作参数（即体积流量和转速）在实验研究设计中有所变化，以在65 mL min ^-1下找到最佳值转速为20,000 rpm，其中至少97％的LFP在离心机中分离，同时将尽可能多的C65推入离心机。此外，通过分析粒径分布和沉积物堆积来讨论分离机理。高转速和低体积流量导致沉积物中碳含量方面的明显的径向和轴向梯度。在最佳条件下离心后从沉淀物中提取的LFP表现出初始比容量的98％。