N‐Type Doped Silicon Thin Film on a Porous Cu Current Collector as the Negative Electrode for Li‐Ion Batteries

Mukanova, Aliya; Nurpeissova, Arailym; Kim, Sung‐Soo; Myronov, Maksym; Bakenov, Zhumabay

doi:10.1002/open.201700162

Cited by 37 publications

(25 citation statements)

References 39 publications

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“…Ultrathin wedge‐shape terminals, typically formed at the edges of thin film deposition, may significantly reduce the electrical resistivity, so the charges are allowed to rapidly reach the triple‐phase boundary regions where OER essentially occurs . The SEM inspection shows the ultrathin wedge‐shape and right‐angle terminals of CMOH at the heterojunction edge (Figure m), where the spots are of low resistivity that allows rapid charge transport to the triple‐phase active sites.…”

Section: Resultsmentioning

confidence: 99%

Discontinuity‐Enhanced Thin Film Electrocatalytic Oxygen Evolution

Shih

Jhang

Tsai

et al. 2019

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splitting, low-cost and facile fabrication of electrocatalysts, active for oxygen evolution reaction (OER) without involving precious metals (e.g., Ru and Ir), is therefore the central interests. [8,9] General approaches and knowledge capable of enhancing atom-efficiency in OER are also essential to conserve all the elements used in electrocatalysts regardless the individual nature abundance.As compared to colloidal electrocatalysts, scalable thin film electrocatalysts have been recognized by rapid mass transfer and robust adhesion with electrodes against peeling of electrocatalytic materials during oxygen bubbling, essential to achieve durable water splitting, high power output, and commercial demand of coating on various substrates. [10] The previous OER studies have concentrated on exploring continuous, void-free thin films of Ni, Co, Fe, and Mn oxides in alkaline conditions, [5,[10][11][12][13][14][15][16][17][18][19] revealing the important electrocatalytic influence regarding crystal structures, synergistic behaviors between elements, catalytic roles of active species, alternation of orbitals and electron transfer, and deposition methodologies. As electrocatalytic OER requires electricity (anodic current) and mass transport of reactants (water/OH − ) and product (O 2 ) at catalytic sites to proceed, this so-called "triple-phase boundary region," [20] usually at the heterojunction edges, is anticipated to deliver the best OER activities. By dividing a continuous thin film into fractured, discontinuous pieces (as a concept of "thin film imperfection"), the additionally exposed edge sites can thus greatly improve OER performance and atom efficiency. Recent designs of single atom catalysts may further support this idea. [21,22] In fact, strong edge effects on improving hydrogen evolution reaction (the other half reaction in water splitting) have been well recognized. [23,24] However, this concept of edge exposure in thin film has received much less attentions possibly due to the investigation complexity and coverage uncertainty of discontinuous deposition. With the example of photolithography-patterned electrocatalysts toward improved OER, [25] correlation of OER performance to systematic edge exposure normalizing to unit area is then becoming the most desired information. Recent study on the edge-site atom population of discrete, atom-scale deposition of iron oxides shows a proportional relationship to OER activities. [26] Despite the emerging of edge-dependent OER, reliable deposition over large area with versatile coverage/continuity to achieve Thin film electrocatalysts allow strong binding and intimate electrical contact with electrodes, rapid mass transfer during reaction, and are generally more durable than powder electrocatalysts, which is particularly beneficial for gas evolution reactions. In this work, using cobalt manganese oxyhydroxide, an oxygen evolution reaction (OER) electrocatalyst that can be grown directly on various electrodes as a model system, it is demonstrated that breaking a continuous...

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Section: Resultsmentioning

confidence: 99%

Discontinuity‐Enhanced Thin Film Electrocatalytic Oxygen Evolution

Shih

Jhang

Tsai

et al. 2019

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“…This anode is based on the composite Sn/Co/C where Sn is the electro-active element. Incorporation of novel materials such as silicon nanomaterials and nanostructured graphene are also being actively considered (Guo et al, 2017;Mukanova et al, 2018).…”

Section: Anode Degradation and Safety Profilementioning

confidence: 99%

“…Reproduced with permission from Kong et al (2018b). 2019), foam-like current collectors (Mukanova et al, 2017(Mukanova et al, , 2018Lu et al, 2019), porous reduced graphene oxide/poly(acrylic acid) (rGO-PAA) aerogels based current collectors (Pender et al, 2019). These approaches revolve around the idea of changing the planar architecture of conventional current collectors to confine dendritic growth or redirect it away from the separator.…”

Section: Novel Current Collector Concept Materials and Chemistriesmentioning

confidence: 99%

Batteries Safety: Recent Progress and Current Challenges

2019

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In this growing age of clean energy and the use of power storage to circumvent the use of traditional fossil fuel technologies, batteries of greater capacity, storage, and power are increasingly becoming indispensable. New chemistries are being developed to increase the capacity of traditional lithium ion batteries and to develop batteries beyond Lithium ion. Promising high capacity cathodes and anodes are developed however their large-scale deployment is hindered due to safety concerns. In this review, we summarize recent progress of lithium ion batteries safety, highlight current challenges, and outline the most advanced safety features that may be incorporated to improve battery safety for both lithium ion and batteries beyond lithium ion. Of particular interest is the issue of thermal runaway mitigation by incorporation of novel nano-materials and advanced technologies.

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“…However, the instability of Al metal in organic electrolytes is still a challenge hindering long-cycle sustainability and electrical conductivity [7]. In order to improve the electrical conductivity of the electrodes, various types of current collectors including nickel, stainless steel and carbon in the forms of thin foil, mesh and foam were developed [8][9][10][11][12]. Degradation upon a long-term operation, heavyweight, and weak adhesion of electrode material are still issues to be addressed regarding the current collectors [13,14].…”

Section: Introductionmentioning

confidence: 99%

Electrospun 3D Structured Carbon Current Collector for Li/S Batteries

et al. 2020

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Light weight carbon nanofibers (CNF) fabricated by a simple electrospinning method and used as a 3D structured current collector for a sulfur cathode. Along with a light weight, this 3D current collector allowed us to accommodate a higher amount of sulfur composite, which led to a remarkable increase of the electrode capacity from 200 to 500 mAh per 1 g of the electrode including the mass of the current collector. Varying the electrospinning solution concentration enabled obtaining carbonized nanofibers of uniform structure and controllable diameter from several hundred nanometers to several micrometers. The electrochemical performance of the cathode deposited on carbonized PAN nanofibers at 800 °C was investigated. An initial specific capacity of 1620 mAh g−1 was achieved with a carbonized PAN nanofiber (cPAN) current collector. It exhibited stable cycling over 100 cycles maintaining a reversible capacity of 1104 mAh g−1 at the 100th cycle, while the same composite on the Al foil delivered only 872 mAh g−1. At the same time, 3D structured CNFs with a highly developed surface have a very low areal density of 0.85 mg cm−2 (thickness of ~25 µm), which is lower for almost ten times than the commercial Al current collector with the same thickness (7.33 mg cm−2).

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N‐Type Doped Silicon Thin Film on a Porous Cu Current Collector as the Negative Electrode for Li‐Ion Batteries

Cited by 37 publications

References 39 publications

Discontinuity‐Enhanced Thin Film Electrocatalytic Oxygen Evolution

Discontinuity‐Enhanced Thin Film Electrocatalytic Oxygen Evolution

Batteries Safety: Recent Progress and Current Challenges

Electrospun 3D Structured Carbon Current Collector for Li/S Batteries

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