High-Dielectric Polymer Coating for Uniform Lithium Deposition in Anode-Free Lithium Batteries,ACS Energy Letters

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High-Dielectric Polymer Coating for Uniform Lithium Deposition in Anode-Free Lithium Batteries
ACS Energy Letters ( IF 19.3 ) Pub Date : 2021-11-18 , DOI: 10.1021/acsenergylett.1c02224
Orapa Tamwattana ₁ , Hyeokjun Park _{1,

2} , Jihyeon Kim ₁ , Insang Hwang ₁ , Gabin Yoon _{1,

2} , Tae-hyun Hwang ₃ , Yoon-Sok Kang ₃ , Jinhwan Park ₃ , Nonglak Meethong ₄ , Kisuk Kang _{1,

2}

Affiliation

The use of lithium metal either in an anode or anode-free configuration is envisaged as the most promising way to boost the energy density of the current lithium-ion battery system. Nevertheless, the uncontrolled lithium dendritic growth inhibits practical utilization of lithium metal as an anode due to safety concerns and low Coulombic efficiency. In this work, we show that when a high-dielectric SEI is coated on a current collector, it can effectively promote a uniform lithium deposition by decreasing the overpotential between the surfaces, lowering the local current density and suppressing lithium protrusions. Using a PVDF (polyvinylidene difluoride)-based dielectric medium, it is demonstrated that varying the dielectric properties of PVDF by crystallinity control can regulate the lithium deposition mechanisms. Moreover, when the dielectric properties of PVDF film are tailored by the inclusion of dielectric nanoparticles, a selective formation of high-dielectric β-PVDF phase is induced during its film formation (LiF@PVDF), which synergistically promotes uniform lithium deposition/stripping in an anode-free half-cell setup.

中文翻译：

用于在无阳极锂电池中均匀沉积锂的高介电聚合物涂层

在阳极或无阳极配置中使用锂金属被认为是提高当前锂离子电池系统能量密度的最有前途的方法。然而，由于安全问题和低库仑效率，不受控制的锂枝晶生长抑制了锂金属作为负极的实际应用。在这项工作中，我们表明当高介电 SEI 涂覆在集电器上时，它可以通过降低表面之间的过电位、降低局部电流密度和抑制锂突出来有效地促进锂的均匀沉积。使用基于 PVDF（聚偏二氟乙烯）的电介质，证明通过结晶度控制改变 PVDF 的介电特性可以调节锂沉积机制。而且，

更新日期：2021-12-10

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