In-situ synthesis of porous metal fluoride@carbon composite via simultaneous etching/fluorination enabled superior Li storage performance
SSRN Electronic Journal(2022)
Abstract
Transition metal fluorides as Li-free conversion-type cathode materials have high theoretical specific capacities, however, their preparation strategy, sluggish electrochemical kinetic and poor cyclability have impeded their wide adoption in lithium-ion batteries. Herein, a facile in-situ synthesis of porous metal-fluoride-carbon com-posites is accomplished via simultaneous polytetrafluorethylene-based hard template etching and metal fluori-nation. This not only facilitates fast electron transfer and lithium-ion diffusion kinetics, but also buffers severe volume fluctuation during lithiation/delithation and enables the formation of a uniform and thin Li2CO3/LiF-rich cathode-electrolyte interphase. As a proof of concept, the as-prepared porous FeF3 @C (p-FeF3 @C) indeed ex-hibits a high specific capacity of 230 mAh g-1 at 0.1 C together with an excellent capacity retention of 92.5% at 1 C for 200-cycles. Moreover, the practicality of the strategy is demonstrated by the superb electrochemical performance of the full-cells coupled with pre-lithiated graphite anodes. Therefore, the proposed novel synthetic strategy will enlighten the future design of high-performance metal-fluoride-carbon composites with porous structure for energy storage applications.
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Key words
Porous materials,Metal fluorides,Li -free cathodes,Cathode -electrolyte interphase (CEI),Lithium -ion batteries,In -situ synthesis
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