Gum-Like Nanocomposites as Conformable, Conductive, and Adhesive Electrode Matrix for Energy Storage Devices

The electrodes in energy storage devices, such as lithium/sodium ion batteries, are typical multicomponent system consisting of inorganic electrode particles, polymer binders, conductive fillers, current collectors, and other components. These components are usually porously combined by a polymeric binder to accomplish the required electrochemical functions. In spite of the great success, this classic porous configuration faces serious issues in mechanical stability and flexibility due to weak and instable structures/ interfaces. Here, by learning from polymeric nanocomposites, a concept of electrode matrix is proposed based on a gum-like nanocomposite, a dual-conductive adhesive. As an electrode matrix, the gum-like nanocomposite integrates the functions of binder, electrolyte, and conductive fillers. In particular, it shows strong adhesion, high electrical/ionic conductivities, and appropriate mechanical and self-healing properties. Finally, it is demonstrated that, with the electrode matrix, battery electrodes can be fabricated into nonporous composite showing not only excellent mechanical flexibility/ stability but also improved electrochemical performance when working with a gum-like electrolyte.