"Practical Challenges and Future Perspectives of All-Solid-State Lithium-Metal Batteries"

Shuixin Xia: Xinsheng Wu, Zhichu Zhang, Yi Cui, Wei Liu; Chem, 12/20/18.

Additional Authors: Xinsheng Wu, Zhichu Zhang, Yi Cui, Wei Liu

Abstract:

The Bigger Picture

Lithium-ion batteries are one of the most promising energy-storage devices for their high energy density, superior cycling stability, and light weight. However, the state-of-the-art lithium-ion batteries cannot satisfy the rising demand of high energy density. Advanced lithium batteries based on metallic lithium anodes could provide higher energy density and thus become a hot research topic. The main challenges of developing lithium-metal anodes are the dendritic growth with a possibility of short circuit (leading to thermal runaway) and the low Coulombic efficiency with poor cycle life. Developing lithium-metal batteries based on solid electrolytes can fundamentally alleviate the safety concerns. This review highlights the most recent approaches to addressing the sluggish ion transport of solid-state electrolyte as well as the high impedances at the electrode-electrolyte interface. The critical challenges and future developments for all-solid-state lithium-metal batteries are also discussed.

Summary

The fundamental understandings and technological innovations in lithium-ion batteries are essential for delivering high energy density, stable cyclability, and cost-effective energy storages with the growing demands in the applications of electrical vehicles and smart grid. Solid-state electrolytes (SSEs) are more promising than organic liquid electrolyte in terms of excellent safety in developing lithium-metal anode as well as other high-capacity cathode chemistries, such as sulfur and oxygen. Considerable efforts have been made to give birth to the superionic conductors with ionic conductivities higher than 10−3 S cm−1 at room temperature. However, the high interfacial impedances from the poor compatibility of SSEs with electrodes limit their practical applications, which are discussed in this review. Furthermore, the recent advances and critical challenges for all-solid-state lithium-metal batteries based on the cathode materials of lithium-intercalation compounds, sulfur, and oxygen are overviewed, and their future developments are also prospected.