Unraveling the Loading Amount on Electrochemical Performances of a Lithium Argyrodite-Based All-Solid-State Lithium Battery

• Published in: Industrial & engineering chemistry research Vol. 62; no. 50; pp. 21546 - 21557
• Main Authors: Jiang, Ziling, Liu, Chen, Wei, Chaochao, Wu, Zhongkai, Luo, Qiyue, Yang, Jie, Ming, Liang, Yu, Le, Lyu, Wenbin, Zhang, Long, Cheng, Shijie, Yu, Chuang
• Format: Journal Article
• Language: English
• Published: American Chemical Society 20.12.2023
• Subjects: Applied Chemistry
• ISSN: 0888-5885; 1520-5045
• DOI: 10.1021/acs.iecr.3c03758

The loading amount of the cathode mixture has a significant impact on the energy density of all-solid-state lithium batteries (ASSLBs). Moreover, the chemical/electrochemical instability of argyrodite electrolytes toward bare layered materials also affects the battery performances. However, the effects of electrode loading, which consists of bare active materials and carbon additives, are not fully investigated. In this work, electrochemical performances of Li6PS5Cl-based ASSLBs using the bare LiNi0.7Mn0.2CO0.1O2 (NCM712) as active materials with different cathode loading amounts (10.2, 20.4, and 31.8 mg cm–2) are systematic studied. The experimental results show that the carbon additives have a minor effect on the electrochemical performances under low cathode loading, while the increased loading amount promotes the discharge capacities. At 10.2 mg cm–2, those assembled batteries utilizing a cathode with and without carbon deliver comparable initial discharge capacities of 153.54 and 151.5 mAh g–1 when cycled at 0.1C and maintain 92.3 and 96.9% after 100 cycles, respectively. When the loading amount increased to 31.8 mg cm–2, the cathode including carbon additives for the first cycle is 114.83 mAh g–1, and 98.7% of this value can be sustained after 100 cycles. The superior cyclability are due to the lower upper cutoff voltage during cycling. Our results confirm the loading affects the diffusion length of Li ions and the solid/solid interfacial contacts in ASSLBs.