当前位置: X-MOL 学术Adv. Energy Mater. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
High Polarity Poly(vinylidene difluoride) Thin Coating for Dendrite‐Free and High‐Performance Lithium Metal Anodes
Advanced Energy Materials ( IF 27.8 ) Pub Date : 2017-09-06 , DOI: 10.1002/aenm.201701482
Jing Luo,Chia-Chen Fang,Nae-Lih Wu

The high‐polarity β‐phase poly(vinylidene difluoride) (β‐PVDF), which has all trans conformation with F and H atoms located on the opposite sides of the polymer backbone, is demonstrated to be a promising artificial solid‐electrolyte interphase coating on both Cu and Li metal anodes for dendrite‐free Li deposition/stripping and enhanced cycling performance. A thin (≈4 µm) β‐PVDF coating on Cu enables uniform Li deposition/stripping at high current densities up to 5 mA cm−2, Li‐plating capacity loadings of up to 4 mAh cm−2, and excellent cycling stability over hundreds of cycles under practical conditions (1 mA cm−2 with 2 mAh cm−2). Full cells containing an LiFePO4 cathode and an anode of either β‐PVDF coated Cu or Li also exhibit excellent cycling stability. The profound effects of the high‐polarity PVDF coating on dendrite suppression are attributed to the electronegative F‐rich interface that favors layer‐by‐layer Li deposition. This study offers a new strategy for the development of dendrite‐free metal anode technology.

中文翻译:

用于无枝晶和高性能锂金属阳极的高极性聚偏二氟乙烯薄涂层

高极性β-相聚偏二氟乙烯(β-PVDF)与位于聚合物主链相反侧的F和H原子具有全部反式构象,被证明是一种有前途的人造固体电解质界面涂层在铜和锂金属阳极上都可使用,以实现无枝晶的锂沉积/剥离并增强循环性能。Cu上的薄(≈4µm)β-PVDF涂层可在高达5 mA cm -2的高电流密度下实现均匀的Li沉积/剥离,Li-电镀容量负荷高达4 mAh cm -2,并且在在实际条件下(1 mA cm -2和2 mAh cm -2)进行数百个循环。充满LiFePO 4的完整电池β-PVDF涂层的Cu或Li的阴极和阳极也具有出色的循环稳定性。高极性PVDF涂层对枝晶抑制的深远影响归因于有利于逐层Li沉积的负电F富界面。这项研究为发展无枝晶金属阳极技术提供了新的策略。
更新日期:2017-09-06
down
wechat
bug