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Issue 8, 2017
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A room-temperature liquid metal-based self-healing anode for lithium-ion batteries with an ultra-long cycle life

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Abstract

Benefiting from fluidity and surface tension, materials in a liquid form are one of the best candidates for self-healing applications. This feature is highly desirable for improving the life cycle of lithium-ion batteries (LIBs) because the volume expansion/contraction during the cycles of high-capacity anodes such as Si and Sn can result in mechanical fracture and lead to inferior cycle performance. Here, we report a novel room-temperature liquid metal (LM) as the anode to improve the cycle life of LIBs. The LM anode comprises an alloy of Sn and Ga, a liquid at room temperature with inherent self-healing properties, as confirmed by the in situ and ex situ analyses. Because both Ga and Sn have high theoretical capacities (769 and 990 mA h g−1, respectively), the resulting LM anode delivers a high capacity of 775, 690, and 613 mA h g−1 at the rate of 200, 500, and 1000 mA g−1, respectively. There was no obvious decay in more than 4000 cycles with a capacity of ∼400 mA h g−1 at 4000 mA g−1, realizing the best cycle performance among all metal anodes.

Graphical abstract: A room-temperature liquid metal-based self-healing anode for lithium-ion batteries with an ultra-long cycle life

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Article information


Submitted
28 Jun 2017
Accepted
20 Jul 2017
First published
02 Aug 2017

Energy Environ. Sci., 2017,10, 1854-1861
Article type
Paper

A room-temperature liquid metal-based self-healing anode for lithium-ion batteries with an ultra-long cycle life

Y. Wu, L. Huang, X. Huang, X. Guo, D. Liu, D. Zheng, X. Zhang, R. Ren, D. Qu and J. Chen, Energy Environ. Sci., 2017, 10, 1854
DOI: 10.1039/C7EE01798G

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