Polymer-Inorganic Composite Protective Layer for Stable Na Metal Anodes

Chen，Qianwen1; Hou，Zhen1; Sun，Zongzhao1,2; Pu，Yayun1; Jiang，Yabin1; Zhao，Yun1; He，Heng1,2; Zhang，Tianxu1; Huang，Limin1,3

2020

10.1021/acsaem.9b02508

ACS Applied Energy Materials   影响因子和分区

2574-0962

2574-0962

Na metal anodes have attracted great interest because of their low electrochemical potential, high theoretical specific capacity, and natural abundance. However, nonuniform Na ion flux induced by an inhomogeneous solid electrolyte interphase (SEI) usually leads to the formation of mossy or dendritic Na, resulting in a low Coulombic efficiency (CE) and potential safety hazards. Herein, a well-designed artificial protective layer consisting of poly(vinylidene fluoride) (PVDF) and Sn nanoparticles was successfully constructed on a Cu current collector (PSN@Cu current collector) by a scalable and facile doctor blade coating technology. The flexible PVDF matrix in the protective layer can accommodate interface fluctuations, whereas the sodiophilic Sn nanoparticles can provide sufficient ionic conductivity for uniform deposition/stripping and a high mechanical modulus against potential dendrite growth. As a result, a high average CE of 99.73% can be achieved for 2800 h at 2 mA cm with the PSN@Cu current collector. Furthermore, the PSN@Cu current collector has a stable cycling lifetime of 2300 h at 1 mAh cm, which is more than 10 times higher than that of bare Cu current collector (∼220 h). In addition, the unique structure and composition of the PSN-derived SEI are carefully investigated and can explain the much improved stability and electrochemical performance of Na metal anodes. This approach highlights the significance of a hybrid protective layer with synergistic properties and presents a new opportunity for stabilizing Na metal anodes.

artificial protective layer Cu current collector Na ion conductivity Na metal anode solid electrolyte interphase

SCI ; EI

英语

第一 ; 通讯

Shenzhen Clean Energy Research Institute[CERI-KY-2019-003]

Chemistry ; Energy & Fuels ; Materials Science

Chemistry, Physical ; Energy & Fuels ; Materials Science, Multidisciplinary

WOS:000526598300092

AMER CHEMICAL SOC

20201008260309

Anodes ; Sodium ; Tin ; Solid electrolytes ; Fluorine compounds ; Electric current collectors ; Polyelectrolytes

Tin and Alloys:546.2 ; Alkali Metals:549.1 ; Electric Equipment:704.2 ; Electron Tubes:714.1 ; Nanotechnology:761 ; Chemical Agents and Basic Industrial Chemicals:803 ; Organic Polymers:815.1.1 ; Polymer Products:817.1 ; Solid State Physics:933

2-s2.0-85080970094

Scopus

1.Department of Chemistry,Southern University of Science and Technology,Shenzhen, Guangdong,518055,China
2.School of Chemistry and Chemical Engineering,Harbin Institute of Technology,Harbin,150001,China
3.Guangdong Provincial Key Laboratory of Energy Materials for Electric Power,Southern University of Science and Technology,Shenzhen, Guangdong,518055,China

Chen，Qianwen,Hou，Zhen,Sun，Zongzhao,et al. Polymer-Inorganic Composite Protective Layer for Stable Na Metal Anodes[J]. ACS Applied Energy Materials,2020,3(3):2900-2906.

Chen，Qianwen.,Hou，Zhen.,Sun，Zongzhao.,Pu，Yayun.,Jiang，Yabin.,...&Huang，Limin.(2020).Polymer-Inorganic Composite Protective Layer for Stable Na Metal Anodes.ACS Applied Energy Materials,3(3),2900-2906.

Chen，Qianwen,et al."Polymer-Inorganic Composite Protective Layer for Stable Na Metal Anodes".ACS Applied Energy Materials 3.3(2020):2900-2906.