Effect of Single-Walled Carbon Nanotube Sub-carbon Additives and Graphene Oxide Coating for Enhancing the 5 V LiNi0.5Mn1.5O4 Cathode Material Performance in Lithium-Ion Batteries

• DOI: 10.1021/acssuschemeng.2c04808
• Publication Date: 2022-12-02T22:15:07Z
• Authors: Yi-De Tsai; Jeng-Ywan Shih; Ying-Jeng James Li; Tai-Feng Hung; Li-Fan Hsu; Sayee Kannan Ramaraj; Rajan Jose; Chelladurai Karup...; Chun-Chen Yang
• Keywords: Carbon fibers

High-voltage spinel LiNi0.5Mn1.5O4 (LNMO) is a promising cathode material for next-generation lithium-ion batteries (LIBs), but its poor cycle performance has impeded commercialization. In this study, we developed highly stable LNMO materials having an octahedral morphology through solid-state high-energy ball-mill–cum–spray-drying method. We also novel strategy modifying with two kinds of carbon materials, thereby improving the electrochemical cycling performance. Introducing single-walled nanotubes (SWCNTs) as sub-carbon conductive additive during slurry preparation process improved conductivity electrons between particles material. The electrode modified SWCNT additives exhibited average Coulombic efficiency 99.4% after 500 cycles at 1C, compared 98.9% pristine LNMO-based electrode. Furthermore, used wet-chemical method to coat graphene oxide (GO) onto post-sintered act protective layer, preventing corrosion induced by HF in electrolyte. capacity retention GO-coated 1C (91.8%) was higher than that (52.5%). corresponding dual-modification strategy, combining SWCNTs and GO, provided exhibiting superior rate cyclability, 99.3% 92.9% 1C. Thus, prepared study possessed excellent properties favoring their marketability, applicability, competitiveness application high-voltage LIBs.