Acta Phys. -Chim. Sin. ›› 2023, Vol. 39 ›› Issue (8): 2211017.doi: 10.3866/PKU.WHXB202211017

Special Issue: Solid State Batteries

• REVIEW • Previous Articles     Next Articles

Research Progress of Interface Optimization Strategies for Solid-State Lithium Batteries

Yongzhi Zhao, Chenyang Chen, Wenyi Liu, Weifei Hu, Jinping Liu()   

  • Received:2022-11-08 Accepted:2022-12-12 Published:2022-12-19
  • Contact: Jinping Liu
  • Supported by:
    the National Natural Science Foundation of China(51972257);the National Natural Science Foundation of China(52172229);the Fundamental Research Funds for the Central Universities(2022IVA197)


With the rapid development of electric vehicles and intelligent electronics, Li-based batteries are required to have a higher specific capacity and better safety. To develop batteries with higher energy densities, Li may be used as an anode material owing to its higher theoretical capacity (3860 mAh·g−1, 10 times higher than graphite) and low redox potential (−3.04 V vs. the standard hydrogen electrode). However, uncontrolled Li dendrite growth may occur during electrochemical Li plating/stripping in the liquid electrolyte and may penetrate the separator, resulting in a short circuit of the battery. In addition, the conventional liquid organic electrolyte is flammable and easy to leak, posing safety concerns regarding fire and explosion risks. To address these issues, solid-state electrolytes are considered as a particularly ideal alternative because of their desirable mechanical properties, highly reduced flammability, and reduced risk of leakage. Such properties are expected to prevent Li dendrite growth, mitigate structural damage of the Li anode, and improve battery safety. Nonetheless, it is still a great challenge to manufacture solid-state batteries with high areal capacity and good rate performance stems from the high interfacial resistance between the electrolyte and electrode, which hinders Li-ion transport. Therefore, understanding and addressing the general interface issues in solid-state batteries is key to manufacturing high-performance solid-state lithium batteries. Interface issues in solid-state batteries are highly complex and may be broadly categorized into chemical/electrochemical interface and physical interface problems. The chemical/electrochemical interface problem comprises the narrow electrochemical stability window, elemental interdiffusion, and space charge layers, while the physical interface problem can be divided into rigid interfacial contact, volume change during cycling, and fracture and pulverization caused by stress accumulation. Previous reports represent a relatively comprehensive summary of the methods to solve the chemical/electrochemical interface problems but do not discuss in detail the influence of physical interfaces in solid-state batteries of different structures and the related addressing strategies. First, this review will briefly introduce the chemical/electrochemical interface problems and their solutions. Then, solid-state lithium batteries are divided into divided into the sandwich structure, powder composite structure, and 3D integrated structure, according to the key structural characteristics; the physical interface characteristics and optimization strategies of different battery structures are further analyzed in detail, and the advantages and disadvantages of each system are compared and analyzed. Finally, the future research direction of the electrode/electrolyte interface in solid-state lithium batteries is presented.

Key words: Solid-state lithium battery, Interfacial impedance, Chemical/Electrochemical interface, Physical interface, Optimization strategy