Adjustable Mixed Conductive Interphase for Dendrite-Free Lithium Metal Batteries.
basic_science · Level V
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- Record sourced from PubMed, PMID 35946592.
- Also identified by DOI 10.1021/acsnano.2c05832.
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Abstract
Lithium (Li) metal batteries with high energy density are of great promise for next-generation energy storage; however, they suffer from severe Li dendritic growth and an unstable solid electrolyte interphase. In this study, a mixed ionic and electronic conductive (MIEC) interphase layer with an adjustable ratio assembled by ZnO and Zn nanoparticles is developed. During the initial cycle, the <i>in situ</i> formed Li<sub>2</sub>O with high ionic conductivity and a lithiophilic LiZn alloy with high electronic conductivity enable fast Li<sup>+</sup> transportation in the interlayer and charge transfer at the ion/electron conductive junction, respectively. The optimized interface kinetics is achieved by balancing the ion migration and charge transfer in the MIEC Li<sub>2</sub>O-LiZn interphase. As a result, the symmetric cell with MIEC interphase delivers superior cycling stability of over 1200 h. Also, Li||Zn-ZnO@PP||LFP (LFP = LiFePO<sub>4</sub>) full cells exhibit long cyclic life for 2000 cycles with a very high capacity retention of 91.5% at a high rate of 5 C and stable cycling for 350 cycles at a high LFP loading mass of 13.27 mg cm<sup>-2</sup>.