Lithium plating-free 1 Ah-level high-voltage lithium-ion pouch battery via ambi-functional pentaerythritol disulfate

• Published in: Journal of energy chemistry 2023-08, Vol.83, p.229-238
• Main Authors: Vu, Dung Tien Tuan, Im, Jinsol, Kim, Jae-Hee, Han, Jisoo, Chung, Gyeong Jun, Nguyen, Giang Thi Huong, Seo, Junhyeok, Kim, Minjae, Hwang, Eui-Hyung, Kwon, Young-Gil, Shin, Jae Wook, Cho, Kuk Young, Song, Seung-Wan
• Format: Article
• Language: English
• Subjects: Ambi-functional additive; High-voltage; Lithium plating-free; Lithium-ion pouch cell; SEI layer
• ISSN: 2095-4956
• DOI: 10.1016/j.jechem.2023.04.012

Solid electrolyte interphase (SEI)-stabilizing ambi-functional pentaerythritol disulfate additive working at both NCM523 cathode and graphite anode enables Li plating-free high-voltage LIB and improved performance, from which improved safety and energy density LIBs are anticipated. [Display omitted] Elevating the charge cut-off voltage beyond traditional 4.2 V is a commonly accepted technology to increase the energy density of Li-ion batteries (LIBs) but the risk of Li-dendrites and fire hazard increases as well. The use of ambi-functional additive, which forms stable solid electrolyte interphase (SEI) simultaneously at both cathode and anode, is a key to enabling a dendrites-free and well-working high-voltage LIB. Herein, a novel ambi-functional additive, pentaerythritol disulfate (PEDS), at 1 wt% without any other additive is demonstrated. We show the feasibility and high impacts of PEDS in forming lithium sulfate-incorporated robust SEI layers at NCM523 cathode and graphite anode in 1 Ah-level pouch cell under 4.4 V, 25 °C and 0.1 C rate, which mitigates the high-voltage instability, metal-dissolution and cracks on NCM523 particles, and prevents Li-dendrites at graphite anode. Improved capacity retention of 83% after 300 cycles is thereby achieved, with respect to 69% with base electrolyte, offering a promising path toward the design of practical high-energy LIBs.