Artificial Solid Electrolyte Interphase-Protected LixSi Nanoparticles: An Efficient and Stable Prelithiation Reagent for Lithium-Ion Batteries

• DOI: 10.1021/jacs.5b04526
• Publication Date: 2015-06-19T15:24:12Z
• Authors: Jie Zhao; Zhenda Lu; Haotian Wang; Wei Liu; Hyun-Wook Lee; Kai Yan; Denys Zhuo; Dingchang Lin; Nian Liu; Yi Cui
• Keywords: Passivation; Capacity loss; Lithium carbonate; Thermal Stability

Prelithiation is an important strategy to compensate for lithium loss in lithium-ion batteries, particularly during the formation of solid electrolyte interphase (SEI) from reduced electrolytes first charging cycle. We recently demonstrated that LixSi nanoparticles (NPs) synthesized by thermal alloying can serve as a high-capacity prelithiation reagent, although their chemical stability battery processing environment remained be improved. Here we successfully developed surface modification method enhance NPs exploiting reduction 1-fluorodecane on form continuous and dense coating through reaction process similar SEI formation. The coating, consisting LiF alkyl carbonate with long hydrophobic carbon chains, serves effective passivation layer ambient environment. Remarkably, artificial-SEI-protected show high capacity 2100 mA h g(-1) negligible decay dry air after 5 days maintain 1600 humid (∼10% relative humidity). Silicon, tin, graphite were prelithiated these eliminate irreversible first-cycle loss. use reagents offers new approach realize next-generation high-energy-density batteries.