Designing In-Situ-Formed Interphases Enables Highly Reversible Cobalt-Free LiNiO2 Cathode for Li-ion and Li-metal Batteries

By T. Deng, Xiulin Fan, Longsheng Cao, Ji Chen, Singyuk Hou, Xiao Ji, Long Chen, Shuang Li, Xiuquan Zhou, E. Hu and 3 more. Joule, 2019

218 citations recorded by the source corpus.

Summary Cathode materials control both the energy density and cost of Li-ion and Li-metal batteries. The cobalt-free LiNiO2 with relatively low cost and extremely high theoretical energy density (∼1,050 Wh kg−1) is one of the most promising cathode materials for high-energy batteries. However, the continuous Ni dissolution, structural disordering, particle cracking, and unstable cathode electrolyte interphase (CEI) hinder its applications. Here, we surmount these challenges by forming a robust fluoride (F)- and boron (B)-rich CEI on LiNiO2 using a high-fluorinated electrolyte with LiDFOB additive. The LiNiO2 cathode maintains an unprecedentedly high capacity retention of >80% after 400 deep cycles at a high charge cut-off voltage of 4.4 V (versus Li/Li+). In addition, the electrolyte forms an F- and B-rich interphase on the Li metal and graphite anodes, allowing stable cycling of full cells. This work sheds light on designing interfacial chemistry for high-energy cathodes, and its principle is applicable for other alkali metal ion cathodes.

Subfields: Automotive Engineering, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/e2a404a821c01e20f432f1a0be2277494ad783d9