A dual-functional interlayer for Li–S batteries using carbon fiber film cladded electron-deficient Li2B4O7. Issue 30 (19th July 2022)

• Record Type: Journal Article
• Authors: Dai, Xin; Zou, Kunyang; Jing, Weitao; Xu, Peng; Sun, Junjie; Guo, Shengwu; Tan, Qiang; Liu, Yongning; Zhou, Tengfei; Chen, Yuanzhen
• Is Part Of: Journal of materials chemistry. Volume 10:Issue 30(2022)
• Page Start: 16152
• Page End: 16162
• Publication Date: 2022-07-19
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d2ta04363g
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : An Li2 B4 O7 cladded carbon nanofiber membrane has been designed as an interlayer for Li–S batteries. Due to abundant electronic deficiencies [BO3 ] in Li2 B4 O7, the enhanced electrochemical performance of Li–S batteries was achieved. Abstract : The electron-deficient property of the atoms in functional materials endow them with tunable adsorption and catalysis effects on polysulfides, thus improving the performance of lithium–sulfur batteries. In this work, Li2 B4 O7 nanoparticles, which have abundant electron deficiencies derived from the [BO3 ] Lewis acid units, were uniformly cladded in the carbon nanofibers (LBO–CNF) and employed as interlayers for Li–S batteries. This functionalized interlayer expressed a high adsorption energy of ∼3.6 eV for polysulfides ( e.g., Li2 S6 and Li2 S4 ) and effectively suppressed the polysulfides' shuttle behavior, delivering a high reversible capacity of 1242.6 mA h g −1 at 0.2C and good cycling performance with a low fading rate of 0.068% per cycle at 1C, thus effectually inhibiting the phenomenon of self-discharge. Besides, the lithiation reaction kinetics was also effectively enhanced, enhancing the rate performance of the battery to 644 mA h g −1 at 5C. This work provides a new strategy to enhance the electrochemical performance of Li–S batteries by applying the compounds of electronic-deficiency B-species and functionalized carbon.