Lithium iron phosphate (LFP) batteries are an important source of critical raw materials due to their high content of lithium, graphite, and phosphorus. The overall aim of this study is to develop a recycling process for LFP-batteries combining hydrometallurgical and biohydrometallurgical approaches for efficient recycling of lithium. As part of the biological approach, various autotrophic bioleaching strategies were tested to selectively leach lithium and to enhance the chemical leaching step of the LFP black mass in the process. Direct and indirect bioleaching approaches using biologically produced lixiviants were examined. First experiments showed leaching yields for lithium of nearly 80% with the direct leaching approach (5% w/v solid load) and maximum about 80% for the indirect bioleaching approach (7% w/v solid load). The results of this study demonstrate the possibilities of bioleaching for the recycling of lithium iron phosphate batteries.