Abstract:With the rapid change of portable electronic products and the rapid development of the new energy power automobile industry, a large number of lithium-ion batteries ushered in retirement, the recycling is imminent. The combined process of roasting-water leaching improves the problems of high energy consumption and difficult effective separation of lithium in the traditional pyrometallurgical smelting process, also avoids the problems of large reagent consumption and wastewater treatment in the wet recovery process. It will be the future trend and direction of the development of effective treatment and recovery process for failed lithium-ion battery cathode materials. The research progress of current combined process for the treatment of failed lithium-ion battery cathode materials was reviewed. It is mainly divided into two categories: reduction roasting and salinization roasting. The salinization roasting process greatly reduces the required roasting temperature. According to the different additives, it can be subdivided into sulfation roasting, chlorination roasting and nitrification roasting. By comparing and analyzing the advantages and disadvantages of different combined processes, the future development trend and prospect of the combined process were summarized, which provides a reference for the future development of a cleaner and more efficient recovery process.