Tohoku University · Engineering
Professor Eric Jianfeng Cheng's research lab specializes in advanced solid-state batteries, with a primary focus on developing high-performance solid electrolytes and optimizing interfacial engineering in all-solid-state lithium- and sodium-ion batteries. The lab investigates ceramic materials such as garnet-type LLZO and NASICON-type electrolytes, emphasizing their ionic conductivity, mechanical stability, and compatibility with high-energy cathodes like LiCoO₂. Key research directions include novel fabrication techniques—such as aerosol deposition and quasi-solid-state cathodes—and strategies to reduce interfacial resistance and improve long-term battery durability.
Figures are computed from collected data and may differ slightly.
All solid-state Li-ion batteries offer unprecedented improvements in energy density and safety compared to contemporary Li-ion batteries. As one of the most common oxide cathode materials for traditional Li-ion batteries, LiCoO2 (LCO) is also under consideration for use in all solid-state batteries. However, differences in the coefficients of thermal expansion (CTE) between LCO and the solid electrolyte during composite electrode fabrication, and the differential expansion and contraction during
The increasing demand for high-energy-density batteries stimulated the revival of research interest in Li-metal batteries. The garnet-type ceramic Li<sub>7</sub>La<sub>3</sub>Zr<sub>2</sub>O<sub>12</sub> (LLZO) is one of the few solid-state fast-ion conductors that are stable against Li metal. However, the densification of LLZO powders usually requires high sintering temperatures (e.g., 1200 °C), which likely result in Li loss and various side reactions. From an engineering point of view, high-t
Solid-state Li-metal batteries have the potential to achieve both high safety and high energy densities. Among various solid-state fast-ion conductors, the garnet-type Li<sub>7</sub>La<sub>3</sub>Zr<sub>2</sub>O<sub>12</sub> (LLZO) is one of the few that are stable to Li metal. However, the large interfacial resistance between LLZO and cathode materials severely limits the practical application of LLZO. Here a LiCoO<sub>2</sub> (LCO) film was deposited onto an Al-doped LLZO substrate at room tem
This review provides a comprehensive overview of recent advancements in preparation techniques and electrolyte engineering. It also discusses the integration of both single- and multi-phase electrolytes in ASSBs and future research potentials.
Sodium superionic conductors (NASICON) are pivotal for the functionality and safety of solid-state sodium batteries. Their mechanical properties and ionic conductivity are key performance metrics, yet their correlation remains inadequately understood. Addressing this gap is vital for concurrent enhancements in both properties. This study summarizes recent literature on the sintered polycrystalline NASICON solid electrolyte Na1+xZr2SixP3-xO12 (NZSP, 0≤x ≤ 3), focusing on its mechanical properties
Although ceramic solid electrolytes, such as Li<sub>7</sub>La<sub>3</sub>Zr<sub>2</sub>O<sub>12</sub> (LLZO), are promising candidates to replace conventional liquid electrolytes for developing safe and high-energy-density solid-state Li-metal batteries, the large interfacial resistance between cathodes and ceramic solid electrolytes severely limits their practical application. Here we developed an ionic liquid (IL)-containing while nonfluidic quasi-solid-state LiCoO<sub>2</sub> (LCO) composite
Solid-state Li-metal batteries have gained considerable attention for next-generation energy storage because of their potential high energy densities and improved safety. Solid electrolytes are critical to the development of solid-state Li-metal batteries. While various solid electrolytes exhibit fast-ion conductivity, garnet-type oxides are among the few that show good chemical stability against Li metal. In addition, their high oxidation stability allows the use of high-voltage cathodes. Howev
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