2-Thiophene sulfonamide (2-TS)-contained multi-functional electrolyte matching high-voltage LiNi0.8Mn0.1Co0.1O2/graphite batteries with enhanced performances. (20th August 2020)

• Record Type: Journal Article
• Authors: Li, Shuai; Yang, Tianxiang; Wang, Wenlian; Lu, Jing; Zhao, Xiaoyang; Fan, Weizhen; Zuo, Xiaoxi; Nan, Junmin
• Is Part Of: Electrochimica acta. Volume 352(2020)
• Publication Date: 2020-08-20
• Subjects: 2-Thiophene sulfonamide -- Lithium-ion battery -- LiNi0.8Mn0.1Co0.1O2 -- Electrolyte stabilizer -- High-voltage; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2020.136492
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: 2-thiophene sulfonamide (2-TS) is demonstrated as a multi-functional additive to functionalize the electrolyte and improve the performances of LiNi0.8 Mn0.1 Co0.1 O2 (NCM811)/graphite batteries. Compared with the batteries without 2-TS, the performances of batteries with 2-TS containing electrolyte are significantly improved at wide temperature and high cut-off charge voltage of 4.40 V (vs. Li/Li + ）. After 500 cycles at room temperature and in the voltage range of 2.80–4.20 V, the batteries with 1% 2-TS and without 2-TS additive lose 8.40% and 23.59% initial discharge capacity, respectively. At an elevated temperature of 45 °C and in the voltage range of 2.80–4.40 V, the cycle performance of the batteries with 1% 2-TS is also enhanced, i.e., 68.68% initial discharge capacity is remained after 115 cycles, while the batteries without 2-TS has already decayed to the lifespan point. It is shown that 2-TS molecules can both consume the H2 O/HF residues to alleviate the decomposition of LiPF6 and preferentially react on the electrodes to form uniform and dense low-resistance films. These results demonstrate this electrolyte can effectively improve the battery performances and has promising prospects applying in high-voltage and high-nickel NCM-based batteries. Highlights: The NCM811/graphite batteries with 2-TS show enhanced performances at 25 °C and 45 °C. The first proposed 2-TS as an overall-functional electrolyte additive for high voltage NCM811/graphite batteries. The 2-TS-derived interfacial films on both electrodes exhibit high stability and low impedance. The 2-TS enables a more stable internal environment—less HF attack, less decomposition of EC and lithium salt LiPF6 .