The recovery of lithium is a crucial step in battery recycling. Currently, wet leaching technology is commonly employed to extract valuable elements from the black powder. This process involves impurity removal and purification, resulting in a refined lithium sulfate solution. Carbonic acid is subsequently added. Sodium is used to produce either industrial-grade lithium carbonate or crude lithium carbonate. The resulting lithium carbonate undergoes further refinement to remove impurities, creating a product suitable for battery production. Given the growing demand in the lithium hydroxide market, the cost-effective and efficient conversion of lithium carbonate to lithium hydroxide has become increasingly important. This study centers on the conversion process, transforming lithium carbonate obtained from battery recycling into lithium hydroxide. The analysis covers critical factors, including raw material selection, process routes, product and byproduct yields, and energy consumption across various process options. Through a comparison of advantages and disadvantages, suitable process routes for different company states were summarized, aims to offer valuable insights for optimizing production and adding value to the recycling industry chain. This study can serve as guidance for battery recycling companies when choosing lithium hydroxide production methods. Furthermore, it serves as a reference for producing lithium hydroxide from lithium carbonate obtained via extraction from salt lakes and ores.