Superlithiophilic graphene-silver enabling ultra-stable hosts for lithium metal anodes,Inorganic Chemistry Frontiers

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Superlithiophilic graphene-silver enabling ultra-stable hosts for lithium metal anodes
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2019/12/19 , DOI: 10.1039/c9qi01457h
Huifeng Zhuang _{1,

2,

3,

4,

5} , Ping Zhao _{1,

2,

3,

4,

5} , Yue Xu _{1,

2,

3,

4,

5}

Affiliation

Lithium (Li) metal anodes are considered to be one of the most superior anodes due to their high energy density and lowest electrochemical potential. However, the formation of Li dendrites, uneven deposition, and infinite relative dimension change hinder their popularity. In this work, three-dimensional (3D) graphene composite silver nanoparticles (GO-Ag NPs) were proposed as the Li hosts. The graphene–silver–lithium (GAL) composite anode prepared via the thermal infusion strategy of Li ions effectively inhibits the formation of Li dendrites and the infinite relative dimension change to achieve long-term cycling stability. The modified lithiophilic nature of the GAL composite anode was achieved through the decoration of silver nanoparticles, effectively reducing the nucleation barrier of Li ions and inducing their uniform deposition. Also, the conductive porous 3D graphene aerogel is more conducive to the transport of Li ions/electrons, while providing sufficient space for Li deposition, thereby avoiding the volume change of Li anodes. Therefore, in the evaluation of symmetrical cells, the GAL composite anode exhibit a flat voltage profile and long-term cycling stability, and can be operated at a high current density of 3 mA cm⁻² over 400 cycles. Similarly, when matching the full cells with LiFePO₄ (LFP) or Li₄Ti₅O₁₂ (LTO), the capacity retention of the LFP/GAL full cell could reach up to 96% after 300 cycles in comparison with 81% of the bare Li anode, enabling the long-term operation of the LTO/GAL full cell over 450 cycles.

中文翻译：

超亲锂性石墨烯-银可为锂金属阳极提供超稳定的基质

锂（Li）金属阳极由于其高能量密度和最低电化学势而被认为是最优越的阳极之一。然而，Li树枝状晶体的形成，不均匀的沉积以及无限的相对尺寸变化阻碍了它们的普及。在这项工作中，提出了三维（3D）石墨烯复合银纳米颗粒（GO-Ag NPs）作为Li主体。石墨烯-银-锂（GAL）复合阳极通过锂离子的热注入策略有效地抑制了锂树枝状晶体的形成和无限的相对尺寸变化，从而实现了长期的循环稳定性。GAL复合阳极的修饰的亲硫性质是通过装饰纳米银颗粒实现的，有效降低了锂离子的成核势垒并诱导了其均匀沉积。而且，导电多孔3D石墨烯气凝胶更有利于锂离子/电子的传输，同时为锂沉积提供足够的空间，从而避免了锂阳极的体积变化。因此，在对称电池的评估中，GAL复合阳极显示出平坦的电压曲线和长期循环稳定性，并且可以在3 mA cm ^-2的高电流密度下运行超过400个循环。同样，当将完整的电池与LiFePO ₄（LFP）或Li ₄ Ti ₅ O ₁₂（LTO）匹配时，经过300次循环后，LFP / GAL完整电池的容量保持率可以达到96％，而锂电池的81％裸露的Li阳极，可使LTO / GAL满电池在450个循环中长期运行。

更新日期：2020-02-18

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