Natural Stibnite for Lithium-/Sodium-Ion Batteries: Carbon Dots Evoked High Initial Coulombic Efficiency
Yinger Xiang,Laiqiang Xu,Lei Yang,Yulong Ye,Zhaofei Ge,Jiae Wu,Wentao Deng,Guoqiang Zou,Hongshuai Hou,Xiaobo Ji +9 more
TLDR
In this article , the chemical process of local oxidation-partial reduction-deep coupling for stibnite reduction of carbon dots (CDs) is revealed by in-situ high-temperature X-ray diffraction.Abstract:
The chemical process of local oxidation-partial reduction-deep coupling for stibnite reduction of carbon dots (CDs) is revealed by in-situ high-temperature X-ray diffraction. Sb2S3@xCDs anode delivers high initial coulombic efficiency in lithium ion batteries (85.2%) and sodium ion batteries (82.9%), respectively. C-S bond influenced by oxygen-rich carbon matrix can restrain the conversion of sulfur to sulfite, well confirmed by X-ray photoelectron spectroscopy characterization of solid electrolyte interphase layers helped with density functional theory calculations. CDs-induced Sb-O-C bond is proved to effectively regulate the interfacial electronic structure. The application of Sb2S3 with marvelous theoretical capacity for alkali metal-ion batteries is seriously limited by its poor electrical conductivity and low initial coulombic efficiency (ICE). In this work, natural stibnite modified by carbon dots (Sb2S3@xCDs) is elaborately designed with high ICE. Greatly, chemical processes of local oxidation-partial reduction-deep coupling for stibnite reduction of CDs are clearly demonstrated, confirmed with in situ high-temperature X-ray diffraction. More impressively, the ICE for lithium-ion batteries (LIBs) is enhanced to 85%, through the effect of oxygen-rich carbon matrix on C-S bonds which inhibit the conversion of sulfur to sulfite, well supported by X-ray photoelectron spectroscopy characterization of solid electrolyte interphase layers helped with density functional theory calculations. Not than less, it is found that Sb-O-C bonds existed in the interface effectively promote the electronic conductivity and expedite ion transmission by reducing the bandgap and restraining the slip of the dislocation. As a result, the optimal sample delivers a tremendous reversible capacity of 660 mAh g-1 in LIBs at a high current rate of 5 A g-1. This work provides a new methodology for enhancing the electrochemical energy storage performance of metal sulfides, especially for improving the ICE. read more
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Facile Access to Fabricate Carbon Dots and Perspective of Large-Scale Applications.
TL;DR: In this paper , a review of the recent progresses in the research of the methods for large-scale production of CDs and their functionalization is summarized, especially, the methods of CD synthesis, such as large scale preparation, hydrothermal/solvothermal, microwave-assisted, magnetic hyperthermia microfluidic and other methods, along with functionalization of CDs, are summarized in detail.
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Tailoring Rational Crystal Orientation and Tunable Sulfur Vacancy on Metal‐Sulfides toward Advanced Ultrafast Ion‐Storage Capability
Wenqing Zhao,Shaohui Yuan,Shuya Lei,Zihao Zeng,Jinfeng Dong,Fengqing Jiang,Yue Yang,Wei-jia Sun,Xiaobo Ji,Peng Ge +9 more
TL;DR: In this article , spindle-like antimony sulfide (Sb2S3) is tailored with favorable (hk1) crystal orientation and rich S-vacancies using a simple hydrothermal method, which improves electric conductivity significantly.
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Tannic acid assisted metal–chelate interphase toward highly stable Zn metal anodes in rechargeable aqueous zinc-ion batteries
TL;DR: A metal-chelate interphase with high Zn affinity is constructed on the Zn metal surface (TA@Zn) via dipping metallic Zn into a tannic acid (TA) solution to address the long-standing Zn anode issues such as dendrite growth, hydrogen evolution, and passivation as mentioned in this paper .
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Enhancing pseudocapacitive behavior of MOF-derived TiO2-x@Carbon nanocubes via Mo-doping for high-performance sodium-ion capacitors
TL;DR: In this article , a novel way to enhance the pseudocapacitive storage behavior and reaction kinetics of a TiO2-based anode via Mo-doping and carbon hybridization was presented.
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Directional Regulation of Surface Chemistry of Graphene Using Carbon Dots for Sodium-Ion Battery Anodes
TL;DR: In this article , the authors fabricated carbon dot/reduced graphene oxide composites using oxygen-functionalized CDs and conductive graphene oxide (GO) by a hydrothermal method and calcination at 250 °C.
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