Rational Design of a Laminated Dual-Polymer/Polymer–Ceramic Composite Electrolyte for High-Voltage All-Solid-State Lithium Batteries

• Published in: ACS materials letters Vol. 2; no. 4; pp. 317 - 324
• Main Authors: Yu, Xingwen, Li, Jianyu, Manthiram, Arumugam
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 06.04.2020; ACS Publications
• Subjects: Materials Science
• ISSN: 2639-4979; 2639-4979
• DOI: 10.1021/acsmaterialslett.9b00535

We present a multi-layer approach to design a laminated dual-polymer/polymer–ceramic composite electrolyte (LDPPCCE) for high-voltage all-solid-state lithium batteries. An anode friendly poly­(ethylene oxide) (PEO) serves as a matrix to face the Li-metal anode. To enhance the room-temperature Li+-ion conductivity, succinonitrile (SN) is incorporated into the PEO. At the cathode side, an oxidation tolerant poly­(acrylonitrile) (PAN) matrix is employed. To enhance the ionic conductivity and suppress lithium dendrite, NASICON-type lithium aluminum titanium phosphate (Li1+x Al x Ti2–x (PO4)3, LATP) powder is integrated into the PAN. The PEO-SN dual-polymer and the PAN-LATP composite deliver matched ionic conductivity. Uniting the two electrolyte layers, the resulting elastic LDPPCCE exhibits an ionic conductivity of 1.31 × 10–4 S cm–1 at ambient temperature with an electrochemical stability window of 0–5 V. All-solid-state lithium cells, fabricated with the LDPPCCE electrolyte, high-capacity/high-voltage LiNi0.8Co0.1Mn0.1O2 cathode, and lithium–metal anode exhibit exceptional electrochemical performance with a long cycle life.