From −20 °C to 150 °C: a lithium secondary battery with a wide temperature window obtained via manipulated competitive decomposition in electrolyte solution. Issue 14 (30th March 2021)

• Record Type: Journal Article
• Authors: Zheng, Tianle; Xiong, Jianwei; Zhu, Bingying; Shi, Xiaotang; Cheng, Ya-Jun; Zhao, Hongbin; Xia, Yonggao
• Is Part Of: Journal of materials chemistry. Volume 9:Issue 14(2021)
• Page Start: 9307
• Page End: 9318
• Publication Date: 2021-03-30
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d1ta00895a
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : A competitive decomposition process is manipulated with ADN in an electrolyte solution containing EC, LiTFSI, and LiODFB via a solvation mechanism, which endows lithium metal batteries work over a wide temperature range between −20 °C and 150 °C. Abstract : Lithium secondary batteries (LSBs) have witnessed explosive growth in the last decade. A wide operating temperature window is crucial for practical applications. A new concept is developed to expand the temperature window between −20 °C and 150 °C, where a competitive decomposition process between the electrolyte and solvent is manipulated with adiponitrile (ADN) over a wide temperature range. The decomposition of ethylene carbonate (EC) solvent and anions of lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) and lithium oxalyldifluoroborate (LiODFB) is regulated with ADN via a temperature-dependent lithium solvation mechanism. As a result, a SEI layer with a rich inorganic component is formed at elevated temperatures, leading to improved performance in lithium titanate (LTO)/Li, lithium iron phosphate (LFP)/Li, and LiNi0.5 Co0.2 Mn0.3 O2 (NCM523)/Li batteries over a wide temperature range. It enables a coulombic efficiency (CE) of 97.39% at 100 °C and more than 100 hours of cycling of Li/Li batteries at 150 °C, as well as stable cycling of LFP/Li batteries in the temperature range between 120 °C and −20 °C. Stable cycling performance is demonstrated with the LTO/Li batteries over a wider temperature range from −40 °C to 150 °C. High-temperature electrochemical stability is exhibited at 5C, with a capacity retention ratio of 87.94% at 120 °C and 99.93% at 100 °C after 1000 cycles.