In:
Journal of Materials Chemistry A, Royal Society of Chemistry (RSC), Vol. 10, No. 10 ( 2022), p. 5391-5401
Abstract:
Combining Li-metal anodes with high-energy cathodes can hopefully produce high-energy-density batteries (∼500 W h kg −1 ). However, practical applications of Li-metal anodes are limited by irregular Li growth, which leads to a short cycling life and serious security risks. Herein, we report a flexible network consisting of Li 0.33 La 0.56 TiO 3 /carbon nanowires coated with an Au layer (LLTO/C@Au) to work as a Li metal host. The LLTO nanocrystals encapsulated in carbon increase the Li ion conductivity and flexibility of the network. Moreover, the lithiophilic Au layer leads to a feasible and homogeneous Li metal deposition at the surface, which further boosts the Li ion migration in the nanowires. As a result, the diffusion coefficient of the lithiophilic and ionic conductive network (LLTO/C@Au) is much higher than that of the only ionic conductive network (LLTO/C) and the only lithiophilic network (C@Au). Such synergistic effects of the lithiophilic and ionic conductive network on simultaneously optimizing the nucleation, transportation, and accumulation of Li enable circumferential Li metal plating/stripping at high rates. The LLTO/C@Au–Li symmetrical cell can run at a high rate of 20 mA cm −2 for 150 cycles with a capacity of 2 mA h cm −2 and at a rate of 2 mA cm −2 for 500 h with a large capacity of 10 mA h cm −2 . This work sheds light on the synergistic mechanism of a lithiophilic and ionic conductive network on the Li metal deposition, which offers a new perspective for designing advanced Li-metal batteries with low negative/positive ratio.
Type of Medium:
Online Resource
ISSN:
2050-7488
,
2050-7496
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2022
detail.hit.zdb_id:
2702232-8
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