N,S-codoped carbon dots as deposition regulating electrolyte additive for stable lithium metal anode

Li, Shuo; Luo, Zheng; Tu, Hanyu; Zhang, Hao; Deng, Weina; Zou, Guoqiang; Hou, Hongshuai; Ji, Xiaobo

doi:10.1016/j.ensm.2021.08.008

Cited by 55 publications

(29 citation statements)

References 41 publications

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“…The decreased Rct after cycling originates from the oxide layer on the surface replaced by conductive Zn. [ 22 ] Notably, the Rct value of Zn@CDs anodes before and after cycling are both much lower than those of pure Zn anodes suggesting fast charge transport capability, which is ascribed to the fact that abundant groups of CDs can validly promote charge transfer and the 0D ultrafine nanostructure can supply high contact between electrolyte and electrode. Except for the EIS test, chronopotentiometry measurements were also performed to study the role of the CDs modifier layer in guiding Zn nucleation behavior (Figure 3e).…”

Section: Resultsmentioning

confidence: 99%

High‐Yield Carbon Dots Interlayer for Ultra‐Stable Zinc Batteries

Zhang

et al. 2022

Advanced Energy Materials

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natural abundance, and operational safety, which is considered to be one of the most promising next-generation batteries. [3] However, Zn anode in the mildly acidic condition is plagued by notorious dendritic growth, inevitable corrosion, as well as hydrogen evolution due to thermodynamic instability, which gives rise to a low coulombic efficiency and poor cycling reversibility during the plating/stripping process. [4] Similar to Li/Na metal batteries, the Zn 2+ ion prefers to form nuclei at dislocated sites due to relatively high potential, and subsequent zinc ions deposit at initial nucleation sites with higher curvature and lower activation energy, further growing into protuberances. The sharp tips of protuberances with the considerably higher electric field would serve as charge center, eventually resulting in furious dendrites growth after long-term accumulation. [5] Most disturbingly, the persistent dendrites growth would result in loose porous morphology and a mass of "dead Zn", which further exacerbates the interfacial parasitic reaction due to excessive exposure between the electrolyte and Zn anode. [6] Therefore, uniform Zn deposition and less contact with water are of great significance to achieving the long cycle life of the Zn anode.Recently, to obtain a robust zinc anode, modification of electrolyte/anode interfaces has been proposed to suppress the formation of Zn dendrites. Electrolyte engineering, [7] including regulation of the electrolyte composition and introduction of additive, one easy and effective strategy, is adopted to enhance the stability of zinc anode via tailoring solvated structure or forming a solid electrolyte interface. However, expensive costs for highly concentrated electrolytes and continual consumption of functional additives seriously impede the large-scale practical application of ZMBs. Another strategy of amending Zn anode structure, such as surface-preferred crystal plane and nano-sized Zn anode, has attracted a great deal of attention, which could greatly reduce the nucleation barrier leading to the inhibition of dendrites growth. [8] Unsatisfactorily, regulating the preferred orientation crystal involves complicated operation techniques, and nano-structured Zn with extensive specific area results in excessive contact between electrode and electrolyte, which may aggravate hydrogen evolution reaction (HER) and Zn corrosion. In addition to the above two strategies to solve the issue of zinc dendrites, constructing an artificial interfacial layer with a similar function to SEI via ex situ coating or in situ growth has been widely studied to ameliorate problems of electrode/electrolyte interface. [9] The metal coating layer exhibits strong affiliationThe practical implementation of Zn metal anodes with high volumetric capacity is seriously plagued by the dendritic growth and accompanying interfacial parasitic reactions. Herein, high yield carbon dots (CDs) with abundant polar functional groups (CHO and CN), as a functional artificial interface layer, are rationally de...

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Section: Resultsmentioning

confidence: 99%

High‐Yield Carbon Dots Interlayer for Ultra‐Stable Zinc Batteries

Zhang

et al. 2022

Advanced Energy Materials

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123

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“…Defect-free carbon lattices are lithiophobic in nature, however, heteroatom doping makes them lithiophilic with high Li + adsorption energy. H. Hou and co-workers 54 showed that N, S co-doped carbon dots (N, S-CDs) can be used as an electrolyte additive to regulate Li-ion homogeneous deposition (Fig. 20c).…”

Section: Quantum Dot Based Nanocomposite Electrodes For Lithium Metal Batteriesmentioning

confidence: 99%

“…In addition, owing to a large number of abundant catalytic active sites and tuneable structural defects, QDs also possess catalytic properties towards the kinetic conversion between sulfur and polysulfides and inhibiting polysulfide shuttling in Li–S batteries 48–50 or kinetic conversion between O 2 and Li 2 O 2 in Li–air batteries. 51–53 QDs have also shown promising results in terms of regulating uniform and dendrite-free metal deposition at the anode 54–56 and improving the lithium-ion transport properties when used as fillers in solid-state electrolytes. 57,58…”

Section: Introductionmentioning

confidence: 99%

Recent progress in quantum dots based nanocomposite electrodes for rechargeable monovalent metal-ion and lithium metal batteries

2022

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“…[19][20][21] In general, homogeneous nucleation is highly desired for uniform Li deposition, which is easily achieved by some lithiophilic sites including polar functional groups, etc. [22][23][24] Lithiophilic species with high Li + affinity can reduce the overpotential during Li nucleation, while producing monodisperse Li + for directing the homogeneous Li nucleation. 25,26 Lithiophilic heteroatoms (N, O, F, and S) have been established as the most efficient nucleation sites due to their atomic distribution.…”

Section: Introductionmentioning

confidence: 99%