Poly(vinylidene difluoride) coating on Cu current collector for high-performance Na metal anode

Hou，Zhen1,2; Wang，Wenhui4; Yu，Yikang1; Zhao，Xixia1; Chen，Qianwen1; Zhao，Lingfei1; Di，Qian1; Ju，Huanxin3; Quan，Zewei1

2019

10.1016/j.ensm.2019.06.026

Energy Storage Materials   影响因子和分区

24058297

2405-8297

Direct utilization of Na metal anode, instead of carbon or alloy-based anode, is highly desired in Na-ion batteries mainly because of its lowest operating potential and high capacity. Nevertheless, unstable solid electrolyte interphase and uncontrollable Na dendrite growth during the repetitive Na deposition/stripping process usually lead to the low Coulombic efficiency and safety hazards. Herein, dendrite-free Na deposition/stripping can be achieved via constructing a protective PVDF layer on Cu current collector through a facile and scalable doctor blade coating technique. As a result, PVDF@Cu current collector exhibits a stable cycling lifetime for 1200 h with a small overpotential (∼35 mV) at 1 mA cm, which is 6 times longer than the bare Cu current collector (∼200 h). Furthermore, PVDF@Cu current collector delivers a high average CE of 99.91% for 2000 h at 1 mA cm. The excellent electrochemical performances of PVDF@Cu current collectors are found to arise from the formation of a stable solid electrolyte interphase consisted of NaO with a high shear modulus and rich NaF with a fast Na ion migration based on the defluorination reaction between PVDF and Na metal anode, which synergistically suppresses Na dendrite growth. This approach provides a new opportunity to stabilize Na metal anode.

Cu current collector Na metal anode PVDF coating Solid electrolyte interphase

SCI ; EI

英语

第一 ; 通讯

Development and Reform Commission of Shenzhen Municipality[] ; National Natural Science Foundation of China[51772142]

Chemistry ; Science & Technology - Other Topics ; Materials Science

Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary

WOS:000500484000062

Elsevier B.V.

20192907207029

Anodes ; Coatings ; Deposition ; Electric current collectors ; Metals ; Shear flow ; Sodium compounds

Fluid Flow, General:631.1 ; Electric Equipment:704.2 ; Electron Tubes:714.1 ; Chemical Operations:802.3 ; Chemical Agents and Basic Industrial Chemicals:803 ; Coating Materials:813.2

2-s2.0-85068094954

Scopus

1.Department of ChemistrySouthern University of Science and Technology (SUSTech),Shenzhen,518055,China
2.School of Chemistry and Chemical EngineeringHarbin Institute of Technology,Harbin,150001,China
3.University of Science and Technology of China,Hefei,230000,China
4.Shenzhen Key Laboratory of Organic Pollution Prevention and ControlEnvironmental Science and Engineering Research CenterHarbin Institute of Technology (Shenzhen),Shenzhen,518055,China

Hou，Zhen,Wang，Wenhui,Yu，Yikang,et al. Poly(vinylidene difluoride) coating on Cu current collector for high-performance Na metal anode[J]. Energy Storage Materials,2019,24:588-593.

Hou，Zhen.,Wang，Wenhui.,Yu，Yikang.,Zhao，Xixia.,Chen，Qianwen.,...&Quan，Zewei.(2019).Poly(vinylidene difluoride) coating on Cu current collector for high-performance Na metal anode.Energy Storage Materials,24,588-593.

Hou，Zhen,et al."Poly(vinylidene difluoride) coating on Cu current collector for high-performance Na metal anode".Energy Storage Materials 24(2019):588-593.