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Lithium-ion batteries (LIBs) are highly significant in terms of electrochemical energy storage devices due to their remarkable attributes such as high energy density, long cycle life, and low cost. However, the utilization of liquid electrolytes in current commercial LIBs raises safety concerns. The primary challenge faced by current LIBs is to enhance energy density while ensuring safety. One promising solution is the utilization of solid-state lithium batteries, which involve a Li metal anode paired with solid electrolytes like organic polymer solid electrolyte (SE), sulfide-based SE, and oxide-based SE. These solid-state batteries have the potential to effectively address the aforementioned challenges. However, the development of such batteries has been hindered by complex interface issues between the SE and the lithium metal anode, unlike conventional liquid electrolytes. This review focuses on three main interface problems: interfacial reactions, lithium dendrites and interfacial physical contacts between SE and lithium metal anodes. It also presents corresponding solutions, aiming to provide valuable insights for the design and fabrication of higher energy density and safe solid-state batteries.

With the application and popularization of new energy vehicles, the demand for high energy density batteries has become increasingly higher. The increase in nickel content in nickel-rich materials leads to higher battery capacity, but inevitably brings about a series of issues that affect battery performance, such as cation mixing, particle microcracks, interfacial problems, thermal stability, and safety. In order to better address the issues associated with nickel-rich materials, this paper provides a brief historical review of nickel-rich materials in chronological order, explores the sources of nickel-rich materials and the current hot issues, and proposes forward-looking suggestions for solving these problems. This review can provide researchers with a profound and clear understanding of nickel-rich materials, and provide next-step research plans for addressing the issues associated with nickel-rich materials, as well as unique insights into the industrialization process.