Research Progress of High-energy-density Solid-state Lithium Ion Batteries Employing Ni-rich Ternary Cathodes

To achieve carbon peaking and carbon neutrality goals, increasing the share of non-fossil energy consumption and accelerating the growth of clean, low-carbon and sustainable energy are highly desirable in developing a clean and diversified energy supply system. In this retrospect, new energy vehicles have become an ideal substitute for the traditional fuel vehicles due to their green, low-carbon, clean and sustainable characteristics, and have promising development in the future transportation industry. However, the continuously increasing demand for longer range and safety performance in electric vehicles has challenged the state-of-the-art liquid-state lithium-ion batteries. At present, the conventional lithium-ion batteries based on the traditional carbonate liquid-state electrolyte face many potential safety issues, such as leakage, volatility, combustion and explosion. In addition, their energy density reaches closely to their theoretical upper limit. Therefore, breakthroughs in battery storage technologies are urgently needed. Solid-state lithium-ion batteries, which are built with solid-state electrolytes and Ni-rich cathodes/graphite (or silicon-carbon) electrodes are the most promising battery technologies combining high energy density and improved safety property. An in-depth literature survey shows that considerable progress in the construction of high safety, high energy density Ni-rich cathodes/graphite (or silicon-carbon) solid-state lithium-ion batteries have been achieved recently. Hence, this review mainly summarizes the research progress and the development of Ni-rich cathodes/graphite (or silicon-carbon) solid-state lithium-ion batteries using inorganic solid electrolytes and polymer solid electrolytes. Moreover, the remaining challenges and future development trends of Ni-rich cathodes/graphite (or silicon-carbon) solid-state lithium-ion batteries are also discussed and presented. It is expected that the current review would contribute to the further research and development of Ni-rich cathodes/graphite (or silicon-carbon) solid-state lithium-ion batteries.