Fluoroethylene Carbonate Additives to Render Uniform Li Deposits in Lithium Metal Batteries

• DOI: 10.1002/adfm.201605989
• Publication Date: 2017-01-20T21:03:31Z
• Authors: Xue‐Qiang Zhang; Xin‐Bing Cheng; Xiang Chen; Chong Yan; Qiang Zhang
• Keywords: Plating (geology); Dendrite (mathematics); Stripping (fiber)

Lithium (Li) metal has been considered as an important substitute for the graphite anode to further boost energy density of Li‐ion batteries. However, Li dendrite growth during plating/stripping causes safety concern and poor lifespan batteries (LMB). Herein, fluoroethylene carbonate (FEC) additives are used form a LiF‐rich solid electrolyte interphase (SEI). The FEC‐induced SEI layer is compact stable, thus beneficial obtain uniform morphology deposits. This dendrite‐free renders significantly improved Coulombic efficiency 98% within 100 cycles in | Cu half‐cell. When FEC‐protected matches high‐loading LiNi 0.5 Co 0.2 Mn 0.3 O 2 (NMC) cathode (12 mg cm −2 ), high initial capacity 154 mAh g −1 (1.9 ) at 180.0 mA obtained. LMB with conversion‐type intercalation‐type NMC affords emerging storage system probe chemistry protection demonstrates material engineering very density.