Sodium Metal Anodes with Self-Correction Function Based on Fluorine-Superdoped CNTs/Cellulose Nanofibrils Composite Paper

Xiao Jian; Xiao Nan; Li KaiZhang LipengMa XiaoqingLi YongLeng ChangyuQiu Jieshan

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Sodium Metal Anodes with Self-Correction Function Based on Fluorine-Superdoped CNTs/Cellulose Nanofibrils Composite Paper

机译：Sodium Metal Anodes with Self-Correction Function Based on Fluorine-Superdoped CNTs/Cellulose Nanofibrils Composite Paper

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Despite much efforts to stabilize sodium metal anodes for promoting their commercial applications, achieving a safe cycling process without intrinsic dendrite growth remains difficult owing to the unstable reaction interface and irregular sodium metal propagation. Herein, fluorine-superdoped carbon nanotubes with a fluorine content of 14.38 at% are achieved using a new oxidation-assisted plasma strategy, and then alternately assembled with cellulose nanofibrils to form periodical conductive/dielectric composite paper with outstanding mechanical properties. The superdoping of fluorine facilitates the construction of a NaF-dominated solid electrolyte interphase layer, while the periodical conductive/dielectric network re-homogenizes electric field distribution around irregular sodium protrusions, realizing a "bottom-up" sodium orientation deposition and the "self-correction" functionality during sodium plating/stripping process. Density functional theory calculations reveal that the specific oxygen species (C-O/C(sic)O) and fluorine species (semi-ionic C-F/covalent CF2) on the surface of carbon matrix, could remarkably trap active fluorine fragments and generate NaF with sodium metal, respectively, which promotes the superdoping of fluorine and forms dendrite-free sodium anodes. This delicate structure renders the sodium anodes a low nucleation overpotential of approximate to 7 mV, high Coulombic efficiency of 99.5% over 300 cycles at 3 mA cm(-2), stable operation for up to 2100 h under approximate to 16 mV, and excellent full battery performance.

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来源
《Advanced functional materials》 |2022年第21期|2111133.1-2111133.13|共13页
作者
Xiao Jian; Xiao Nan; Li KaiZhang LipengMa XiaoqingLi YongLeng ChangyuQiu Jieshan;
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作者单位

Dalian Univ Technol, Liaoning Key Lab Energy Mat & Chem Engn, Sch Chem Engn, State Key Lab Fine Chem, Dalian 116024, Liaoning, Peoples R China|Beijing Univ Chem Technol, Coll Chem Engn, Beijing Adv Innovat Ctr Soft Matter Sci & Engn, State Key Lab Organ I;

Dalian Univ Technol, Liaoning Key Lab Energy Mat & Chem Engn, Sch Chem Engn, State Key Lab Fine Chem, Dalian 116024, Liaoning, Peoples R China;

Beijing Univ Chem Technol, Coll Chem Engn, Beijing Adv Innovat Ctr Soft Matter Sci & Engn, State Key Lab Organ Inorgan Composites, Beijing 100029, Peoples R China;

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fluorine superdoping; NaF; periodic structures; self-correction function; sodium metal anodes;

Sodium Metal Anodes with Self-Correction Function Based on Fluorine-Superdoped CNTs/Cellulose Nanofibrils Composite Paper

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