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

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A room-temperature liquid metal-based self-healing anode for lithium-ion batteries with an ultra-long cycle life
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2017-08-02 00:00:00 , DOI: 10.1039/c7ee01798g
Yingpeng Wu _{1,

2,

3,

4} , Lu Huang _{1,

2,

3,

4} , Xingkang Huang _{1,

2,

3,

4} , Xiaoru Guo _{1,

2,

3,

4} , Dan Liu _{1,

2,

3,

4} , Dong Zheng _{1,

2,

3,

4} , Xuelin Zhang _{1,

2,

3,

4} , Ren Ren _{1,

2,

3,

4} , Deyang Qu _{1,

2,

3,

4} , Junhong Chen _{1,

2,

3,

4}

Affiliation

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.

中文翻译：

具有超长循环寿命的用于锂离子电池的室温液态金属基自修复阳极

得益于流动性和表面张力，液态材料是自修复应用的最佳选择之一。对于提高锂离子电池（LIB）的寿命非常需要此功能，因为在高容量阳极（如Si和Sn）的循环过程中，体积的膨胀/收缩会导致机械断裂并导致循环性能变差。在这里，我们报告一种新型的室温液态金属（LM）作为阳极，以提高LIB的循环寿命。LM阳极包含Sn和Ga的合金，Sn和Ga的合金是一种在室温下具有固有的自愈特性的液体，这已通过原位和异位分析得到了证实。因为Ga和Sn都具有很高的理论容量（769和990 mA hg ^-1分别），所得的LM阳极分别以200、500和1000 mA g ^-1的速率提供775、690和613 mA hg ^-1的高容量。在4000 mA g ^-1下的容量为〜400 mA hg ^{-1的情况下，}在超过4000个循环中没有明显的衰减，实现了所有金属阳极中最佳的循环性能。

更新日期：2017-08-09

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