Graphene‐containing nanomaterials have emerged as important candidates for electrode materials in lithium‐ion batteries (LIBs) due to their unique physical properties. In this review, a brief introduction to recent developments in graphene‐containing nanocomposite electrodes and their derivatives is provided. Subsequently, synthetic routes to nanoparticle/graphene composites and their electrochemical performance in LIBs are highlighted, and the current state‐of‐the‐art and most recent advances in the area of graphene‐containing nanocomposite electrode materials are summarized. The limitations of graphene‐containing materials for energy storage applications are also discussed, with an emphasis on anode and cathode materials. Potential research directions for the future development of graphene‐containing nanocomposites are also presented, with an emphasis placed on practicality and scale‐up considerations for taking such materials from benchtop curiosities to commercial products.

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Germanium-based nanomaterials have emerged as important candidates for next-generation energy-storage devices owing to their unique chemical and physical properties. In this Review, we provide a review of the current state-of-the-art in germanium-based materials design, synthesis, processing, and application in battery technology. The most recent advances in the area of Ge-based nanocomposite electrode materials and electrolytes for solid-state batteries are summarized. The limitations of Ge-based materials for energy-storage applications are discussed, and potential research directions are also presented with an emphasis on commercial products and theoretical investigations.

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Germaniumbasierte Nanomaterialien haben sich wegen ihrer einzigartigen chemischen und physikalischen Eigenschaften zu wichtigen Kandidaten für die nächste Generation von Energiespeichersystemen entwickelt. In diesem Aufsatz stellen wir den aktuellen Stand der Forschung hinsichtlich des Designs, der Synthese, der Verarbeitung und der Anwendung von germaniumbasierten Materialien in der Batterietechnologie vor. Außerdem fassen wir die jüngsten Fortschritte im Bereich der Ge‐basierten Nanokomposit‐Elektrodenmaterialien und Elektrolyte für Festkörperbatterien zusammen. Schließlich diskutieren wir die Grenzen von Ge‐basierten Materialien für Energiespeicheranwendungen und stellen – mit Schwerpunkt auf kommerziellen Produkten und theoretischen Untersuchungen – Überlegungen an, in welche Richtung sich die Forschung weiterbewegen könnte.