Graphene oxide Composites: A versatile material used as protective layer, solid-state electrolyte, and gel electrolyte in metal batteries

Obtaining a "good" electrolyte is one of the major obstacles to the development of new-generation batteries with metal anodes (Li, Na, etc.). Its stability, efficiency in conducting ions (Li+, Na+, …) quickly and in large numbers, environmental acceptable and ease of integration into industrial manufacturing processes are among the most important criteria determining the choice of materials to be used. In this review, we focus specifically on the different uses of GO's as part of the electrolyte in battery like M−metal (M = Li, Na, Zn…) or Vanadium redox flow battery as chemical modification of commercial separator; as component of new separator; as thin film and protective layers composite; and as filler in solid-state electrolyte composite with polymers and gel electrolyte. Analysis of the collected data allows to point out the efficiency and relevance of GO to improve stability, capacity and cyclability of the corresponding electrolyte in operating battery. The review also tries to identify the strengths and weaknesses of the different approaches in order to highlight the advantages and limitations of using GO in electrolyte production.