期刊
ENERGY STORAGE MATERIALS
卷 24, 期 -, 页码 700-706出版社
ELSEVIER
DOI: 10.1016/j.ensm.2019.06.019
关键词
Li metal anode; Li dendrite; Gradient framework; Electric field distribution
资金
- Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program [2017BT01N111]
- Shenzhen Geim Graphene Center
- National Nature Science Foundation of China [51578310]
- Guangdong Province Science and Technology Department [2015A030306010]
- Shenzhen Government [JCYJ20170412171720306, JSGG20170414143635496]
Lithium (Li) metal is one of the most promising anode materials for future high-energy-density rechargeable batteries. However, the uncontrollable growth of dendrites and the related safety issue hindered its practical application. Involving three-dimensional (3D) frameworks for hosting Li metal can provide large electrochemically active surface area and thus endow more homogeneous deposition and delay dendrite formation. But a more ideal situation for ultimately safe and high-performance Li metal based battery is to enable a gradient Li deposition/dissolution process, with the merit of effective utilization of spatial dimension to stabilize Li metal anode to achieve superior electrochemical performance. Here, we report a conductive-dielectric gradient framework which can guide a bottom-up Li deposition and top-down Li dissolution within this structure, rendering controllable and stable Li metal deposition/dissolution process. As a result, in a symmetric cell such anode can deliver stable Li metal deposition/dissolution for 780 h with a low overpotential (<20 mV) at 1 mA cm(-2), and maintain superior cycle stability with a Coulombic efficiency over 95.6% even at a high current density of 8 mA cm(-2). This conductive-dielectric gradient structure design paves a new avenue to stabilize Li metal anode and improve the safety level of metal anode based batteries.
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