Lithiophilic Ag Nanoparticle Layer on Cu Current Collector toward Stable Li Metal Anode,ACS Applied Materials & Interfaces

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Lithiophilic Ag Nanoparticle Layer on Cu Current Collector toward Stable Li Metal Anode
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2019-02-01 00:00:00 , DOI: 10.1021/acsami.9b01521
Zhen Hou _{1,

2} , Yikang Yu ₂ , Wenhui Wang ₂ , Xixia Zhao ₂ , Qian Di ₂ , Qianwen Chen _{1,

2} , Wen Chen _{1,

2} , Yulian Liu ₂ , Zewei Quan ₂

Affiliation

Intractable hurdles of low Coulombic efficiency and dendritic Li formation during a repeated deposition/stripping process hinder the commercial use of Li metal anode for next-generation battery systems. Achieving uniform Li nucleation is one of the effective strategies to address these issues, and it is of practical importance to realize this on a commercial Cu current collector that is lithiophobic. Herein, we design a nanostructured Ag lithiophilic layer on a Cu foil via an electroless plating process for a Li metal current collector. The deposition of lithiophilic Ag particles that are homogeneously distributed on the Cu foil can reduce the nucleation overpotential, realizing uniform Li nucleation and subsequently flat Li plating. As a result, a stable cycle stability of up to 360 h (1 mA cm^–2) and an average Columbic efficiency of 94.5% for 100 cycles (1 mA cm^–2) are achieved. Furthermore, CuAg full cells with LiFePO₄ as a cathode exhibit good cycle performances and low polarization voltage. This approach provides another facile way for a stable lithium metal anode.

中文翻译：

Cu电流收集器上趋于稳定的Li金属阳极的Lithiophilic Ag纳米颗粒层

在重复的沉积/汽提过程中，库仑效率低且难以形成树枝状Li的棘手障碍阻碍了Li金属阳极在下一代电池系统中的商业应用。实现均匀的Li成核是解决这些问题的有效策略之一，在具有商业应用意义的疏铜Cu集电器上实现这一点具有实际意义。在本文中，我们通过化学镀工艺在铜箔上设计了纳米结构的锂亲硫银层，用于制备锂金属集电体。均匀分布在铜箔上的亲硫的Ag颗粒的沉积可以减少形核的超电势，实现均匀的Li形核并随后进行平坦的Li镀层。结果，稳定的循环稳定性长达360 h（1 mA cm ^–2），并且100个周期（1 mA cm ^–2）的平均哥伦布效率为94.5％。此外，以LiFePO ₄为阴极的CuAg全电池表现出良好的循环性能和低极化电压。该方法为稳定的锂金属阳极提供了另一种简便的方法。

更新日期：2019-02-01

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