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Flexible aqueous Ca-ion full battery with super-flat discharge voltage plateau

Nano Research 2022年第1期15卷 701-708页

作者： Panpan Wang Hua Wang Zhe Chen Junwei Wu Jingting Luo Yan Huang School of Materials Science and Engineering Shenzhen UniversityShenzhen 518055China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyShenzhen 518055China Flexible Printed Electronic Technology Center Harbin Institute of TechnologyShenzhen 518055China School of Materials Science and Engineering Harbin Institute of TechnologyShenzhen 518055China College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518055China

Recently,multivalent metal-ion batteries have attracted considerable interests on the merits of their natural abundance and multielectron redox ***,the development of Ca-ion battery is still in their preliminary stage because of the lack of suitable electrode *** Ca-storage performance of the existing materials is still unsatisfactory with low capacity,poor cyclic stability,as well as sloping discharge profiles,which cannot provide stable energy *** this work,transition metal oxide Sn-doped In2O3(ITO)has been explored as the aqueous Ca-ion battery anode,which could deliver a high discharge capacity of 71.2 mAh·g^(-1) with an ultra-flat discharge voltage *** Ca storage mechanism was revealed to be reversible conversion reaction based on ex-situ X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),and transmission electron microscopy(TEM)characterizations.A flexible aqueous Ca-ion battery was subsequently assembled with zinc hexacyanoferrate(ZnHCF)cathode and ITO anode sandwiched by hydrogel electrolyte,which could deliver a high specific capacity of 75.3 mAh·g^(-1) at 0.4 A·g^(-1) with a flat output voltage plateau at around 0.8 *** bendable and flexible Ca-ion battery with decent voltage output will pave the way for the energy storage devices towards practical applications in flexible and wearable electronics.

关键词： multivalent metal ion battery aqueous Ca-ion battery voltage plateau ln2O3(ITO) flexible and wearable

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Electrolyte/Structure‑Dependent Cocktail Mediation Enabling High‑Rate/Low‑plateau Metal Sulfide Anodes for Sodium Storage

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Nano-Micro Letters 2021年第11期13卷 280-293页

作者： Yongchao Tang Yue Wei Anthony F.Hollenkamp Mustafa Musameh Aaron Seeber Tao Jin Xin Pan Han Zhang Yanan Hou Zongbin Zhao Xiaojuan Hao Jieshan Qiu Chunyi Zhi State Key Lab of Fine Chemicals Liaoning Key Lab for Energy Materials and Chemical EngineeringSchool of Chemical EngineeringDalian University of TechnologyDalian 116024P.R.China Manufacturing Commonwealth Scientific and Industrial Research Organization(CSIRO)ClaytonVIC 3168Australia State Key Laboratory of Fine Chemicals School of Chemical EngineeringDalian University of TechnologyDalian 116024P.R.China School of Resources and Environment Engineering Shandong Agriculture and Engineering UniversityJinan 250100P.R.China College of Chemical Engineering Beijing University of Chemical TechnologyBeijing 100029China Department of Materials Science and Engineering City University of Hong Kong83 Tat Chee AvenueHong KongP.R.China

As promising anodes for sodium-ion batteries,metal sulfides ubiquitously suffer from low-rate and high-plateau issues,greatly hindering their application in ***,exemplifying carbon nanotubes(CNTs)-stringed metal sulfides superstructure(CSC)assembled by nano-dispersed SnS_(2) and CoS_(2) phases,cocktail mediation effect similar to that of high-entropy materials is initially studied in ether-based electrolyte to solve the *** high nano-dispersity of metal sulfides in CSC anode underlies the cocktail-like mediation effect,enabling the circumvention of intrinsic drawbacks of different metal *** utilizing ether-based electrolyte,the reversibility of metal sulfides is greatly improved,sustaining a long-life effectivity of cocktail-like *** such,CSC effectively overcomes low-rate flaw of SnS_(2) and highplateau demerit of CoS_(2),simultaneously realizes a high rate and a low *** half-cells,CSC delivers an ultrahigh-rate capability of 327.6 mAh g^(−1) anode at 20 A g^(−1),far outperforming those of monometallic sulfides(SnS_(2),CoS_(2))and their *** with CoS_(2) phase and SnS_(2)/CoS_(2) mixture,CSC shows remarkably lowered average charge voltage up to ca.0.62 ***-assembled CSC//Na1.5VPO4.8F0.7 full-cell shows a good rate capability(0.05~1.0 A g^(−1),120.3 mAh g^(−1) electrode at 0.05 A g^(−1))and a high average discharge voltage up to 2.57 V,comparable to full-cells with alloy-type *** analysis verifies that the cocktail-like mediation effect largely boosts the charge transfer and ionic diffusion in CSC,compared with single phase and mixed *** mechanism study reveals that alternative and complementary electrochemical processes between nano-dispersed SnS_(2) and CoS_(2) phases are responsible for the lowered charge voltage of *** electrolyte/structure-dependent cocktail-like mediation effect effectively enhances the practicability of metal sulfide anodes,which will boost the developm

关键词： Metal sulfide anode Rate capability voltage plateau Cocktail mediation effect Sodium-ion batteries

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