Solid electrolyte/graphite composite particle for an all-solid-state lithium-ion battery

• Published in: Advanced powder technology : the international journal of the Society of Powder Technology, Japan Japan, 2022-07, Vol.33 (7), p.103633, Article 103633
• Main Authors: Iwao, Motoshi, Sakurai, Risa, Nakamura, Hideya, Hayakawa, Eiji, Ohsaki, Shuji, Watano, Satoru
• Format: Article
• Language: English
• Subjects: All-solid-state battery; Composite anode; Dry process; Graphite
• ISSN: 0921-8831; 1568-5527
• DOI: 10.1016/j.apt.2022.103633

[Display omitted] •Composite particles for anode of the all-solid-state lithium ion battery.•Composite particles of graphite and solid electrolyte were produced by a dry process.•The morphologies of composite particles were controlled by the operating parameters.•Composite particles produced by the dry process improved electrochemical performance. A great issue in the development of an all-solid-state lithium-ion battery (ASSLIB) is the fabrication of a composite electrode with good contact between active materials (AMs) and solid electrolytes (SEs). To overcome this challenge, it is important to develop a powder processing technology that produces composite particles of AMs and SEs. In this study, we investigated a dry impact blending process for producing graphite composite particles (typical anode AM) and sulfide SEs. First, by controlling the rotating speed of the rotor in the dry impact blending process, two types of composite particles, namely surface-coated (SC) composite particles with no graphite breakage and matrix-type (MT) composite particles with graphite breakage, were produced. The SC composite particles showed higher electrochemical performance than the MT composite particles due to less change in the graphite crystallinity. Second, the longer the processing times for the preparation of SC composite particles, the higher the SE coating on graphite, resulting in higher electrochemical performance. Third, we demonstrated that the SC composite particles exhibited higher electrochemical performance than those prepared using a conventional lab-scale mixing technique. We demonstrated the effectiveness of the dry impact blending process for the preparation of an anode composite electrode for ASSLIBs.