Compact 3D Copper with Uniform Porous Structure Derived by Electrochemical Dealloying as Dendrite‐Free Lithium Metal Anode Current Collector

Zhao, Heng; Lei, Danni; He, Yan‐Bing; Yuan, Yifei; Yun, Qinbai; Ni, Bin; Lv, Wei; Li, Baohua; Yang, Quan‐Hong; Kang, Feiyu; Lü, Jun

doi:10.1002/aenm.201800266

Cited by 365 publications

(207 citation statements)

References 53 publications

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“…The large capacity loss in the first cycle is due to the formation of irreversible SEI layer . The capacity drop in the initial several cycles is due to the electrode stabilization process with stable SEI layer formation, and the CE gradually increases to 98% after 10 cycles . After 100 cycles, the CoFeS@rGO electrode retains a high sodium storage capacity of 594.0 mAh g −1 (Figure b), showing a much higher capacity retention (89.7%) than that of FeS@rGO (≈77.4%) and bare CoFeS (25.3%).…”

Section: Resultsmentioning

confidence: 97%

Promoting Highly Reversible Sodium Storage of Iron Sulfide Hollow Polyhedrons via Cobalt Incorporation and Graphene Wrapping

Huang

Fan

Xie

et al. 2019

Advanced Energy Materials

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Sodium ion batteries (SIBs) have drawn significant attention owing to their low cost and inherent safety. However, the absence of suitable anode materials with high rate capability and long cycling stability is the major challenge for the practical application of SIBs. Herein, an efficient anode material consisting of uniform hollow iron sulfide polyhedrons with cobalt doping and graphene wrapping (named as CoFeS@rGO) is developed for high‐rate and long‐life SIBs. The graphene‐encapsulated hollow composite assures fast and continuous electron transportation, high Na+ ion accessibility, and strong structural integrity, showing an extremely small volume expansion of only 14.9% upon sodiation and negligible volume contraction during the desodiation. The CoFeS@rGO electrode exhibits high specific capacity (661.9 mAh g−1 at 100 mA g−1), excellent rate capability (449.4 mAh g−1 at 5000 mA g−1), and long cycle life (84.8% capacity retention after 1500 cycles at 1000 mA g−1). In situ X‐ray diffraction and selected‐area electron diffraction patterns show that this novel CoFeS@rGO electrode is based on a reversible conversion reaction. More importantly, when coupled with a Na3V2(PO4)3/C cathode, the sodium ion full battery delivers a superexcellent rate capability (496.8 mAh g−1 at 2000 mA g−1) and ≈96.5% capacity retention over 200 cycles at 500 mA g−1 in the 1.0–3.5 V window. This work indicates that the rationally designed anode material is highly applicable for the next generation SIBs with high‐rate capability and long‐term cyclability.

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Section: Resultsmentioning

confidence: 97%

Promoting Highly Reversible Sodium Storage of Iron Sulfide Hollow Polyhedrons via Cobalt Incorporation and Graphene Wrapping

Huang

Fan

Xie

et al. 2019

Advanced Energy Materials

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“…This is not the case when Li‐foils are supported by metallic substrates or by other 3D host structures where contact of dissimilar metals both wetted by electrolyte (representing corrosive medium) is generated. [ 11b,30 ] In this situation, corrosion could be an utmost obstacle for practical application, as described herein for Li p ‐electrodes.…”

Section: Resultsmentioning

confidence: 99%

Galvanic Corrosion of Lithium‐Powder‐Based Electrodes

Kolesnikov

Kolek

Dohmann

et al. 2020

Advanced Energy Materials

127

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for anode materials to replace graphite [3] in lithium batteries. The application of thin lithium foils is considered to enable an increase in energy density by nearly a factor of 2 in case of solid-state lithium metal batteries (SSLMBs). [4] Besides LIB-derived cathode materials, lithium anodes are often considered for conversion-type cathodes enabling S 8 ||Li and O 2 ||Li batteries as well. [5] Nevertheless, lithium as anode material in rechargeable batteries has been extensively studied over four decades [6] and still no commercial application could be realized. [7] Major challenges concern the safety and uncontrolled lithium electrodeposition that often leads to the formation of high surface area lithium (HSAL), frequently called "dendrites." The high reactivity of pristine lithium and especially electrodeposited lithium leads to severe side reactions with electrolytes which result in the formation of a solid electrolyte interphase (SEI). [8] This SEI, however, is fractured during consecutive lithium electrodeposition and electrodissolution resulting in an inhomogeneous interphase on the lithium surface. These inhomogeneities can cause uncontrolled lithium electrodeposition and the formation of HSAL deposits. [9] Such deposits can occur in needle-like ( = dendritic) morphology and puncture the separator. After growing to the cathode, an internal short-circuit may be caused which dramatically increases the risk of a thermal runaway. To overcome the described issues, various approaches were developed based on electrolyte and lithium anode interphase engineering, [10] minimizing volume changes by using stable hosts, [11] and preventing dendrite formation and propagation by the use of solid-state electrolytes. [12] The stability of materials in contact with its environment is a well-known research area for corrosion science. Corrosion, in general, is defined as the chemical or electrochemical reaction between a material and its environment that results in a deterioration of the material and its properties. [13] As energy storage and conversion systems imply materials in a thermodynamically non-equilibrium state, corrosion-related processes are highly relevant for such systems. Figure 1a presents an overview of possible corrosion-related phenomena in a battery cell. Herein, we only discuss corrosion phenomena which occur in the presence of an electrolyte.At the positive electrode side, dissolution of Al, [14] which is typically used as a positive electrode current collector, and the cathode electrolyte interphase (CEI) [15] formation are phenomena related to corrosion in a battery cell (Figure 1b-d). One of the two processes which leads to dissolution of Al is Lithium metal is considered to be the most promising anode for the next generation of batteries if the issues related to safety and low coulombic efficiency can be overcome. It is known that the initial morphology of the lithium metal anode has a great influence on the cycling characteristics of a lithium metal battery (LMB). Lithium-powder-based el...

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“…These results indicate that the CG host alleviates dendritic Li growth, benefiting from the ability to direct the nucleation of Li. Although our approach does not prevent the formation of SEI layers because of the electrode's porous structure, the cycling performance is comparable to that of other metallic Li hosts reported previously, as shown in Table S2, Supporting Information 22,23,28,32–37. To further investigate the formation of SEI layers, we used electrochemical impedance spectroscopy (EIS) to characterize the impedance by SEI layers in two symmetric cells: one fabricated with Cu foil and the other with the CG host.…”

Section: Resultsmentioning

confidence: 57%

Electrical Conductivity Gradient Based on Heterofibrous Scaffolds for Stable Lithium‐Metal Batteries

Hong

Jung

Kim

et al. 2020

Adv Funct Materials

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The inability to guide the nucleation locations of electrochemically deposited Li has long been considered the main factor limiting the utilization of high‐energy‐density Li‐metal batteries. In this study, an electrical conductivity gradient interfacial host comprising 1D high conductivity copper nanowires and nanocellulose insulating layers is used in stable Li‐metal anodes. The conductivity gradient system guides the nucleation sites of Li‐metal to be directed during electrochemical plating. Additionally, the controlled parameter of the intermediate layer affects the highly stable Li‐metal plating. The electrochemical behavior is confirmed through experiments associated with the COMSOL Multiphysics simulation data. The distributed Li‐ion reaction flux resulting from the controlled electrical conductivity enables stable cycling for more than 250 cycles at 1 mA cm−2. The gradient system effectively suppresses dendrite growth even at a high current density of 5 mA cm−2 and ensures Li plating and stripping with ultra‐long‐term stability. To demonstrate the high‐energy‐density full‐cell application of the developed anode, it is paired with the LiNi0.8Co0.1Mn0.1O2 cathode. The cells demonstrate a high capacity retention of 90% with an extremely high Coulombic efficiency of 99.8% over 100 cycles. These results shed light on the formidable challenges involved in exploiting the engineering aspects of high‐energy‐density Li‐metal batteries.

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Compact 3D Copper with Uniform Porous Structure Derived by Electrochemical Dealloying as Dendrite‐Free Lithium Metal Anode Current Collector

Cited by 365 publications

References 53 publications

Promoting Highly Reversible Sodium Storage of Iron Sulfide Hollow Polyhedrons via Cobalt Incorporation and Graphene Wrapping

Promoting Highly Reversible Sodium Storage of Iron Sulfide Hollow Polyhedrons via Cobalt Incorporation and Graphene Wrapping

Galvanic Corrosion of Lithium‐Powder‐Based Electrodes

Electrical Conductivity Gradient Based on Heterofibrous Scaffolds for Stable Lithium‐Metal Batteries

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