Carbon‐Rich Active Materials with Macrocyclic Nanochannels for High‐Capacity Negative Electrodes in All‐Solid‐State Lithium Rechargeable Batteries

Sato, Sota; Unemoto, Atsushi; Ikeda, Takuji; Orimo, Shin Ichi; Isobe, Hiroyuki

doi:10.1002/smll.201600916

Cited by 36 publications

(35 citation statements)

References 61 publications

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“…[37] The cell saw a capacity retention of 95% after cycling at ~0.6 C at 120 C for 65 cycles. The high operating temperature was necessary to induce the highly conducting phase of LiBH4.…”

Section: 1mentioning

confidence: 97%

Advancing Electrolytes Towards Stable Organic Batteries

Liang¹,

Yao²

2017

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Organic electrode materials offer virtually infinite resource availability, cost advantages, and some of the highest specific energy for batteries to satisfy the demand for large-scale energy storage. Among the biggest challenges for the practical applications of batteries based on organic electrodes is the dissolution of organic active materials into the electrolyte, which leads to underwhelming cycling stability. This minireview provides an overview of electrolyte advancements to improve the stability of organic batteries. Research efforts on the control of solvent polarity, electrolyte mobility, and exploration of novel electrolyte systems are highlighted.

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Section: 1mentioning

confidence: 97%

Advancing Electrolytes Towards Stable Organic Batteries

Liang¹,

Yao²

2017

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“…Organic electrodes have proven problematic in liquid–electrolyte batteries, partially due to their dissolution in the organic solvent . Organic electrodes paired with SSEs have been seldom reported, although SSE separators could function as robust shields to overcome this problem by suppressing the loss of organic electrode .…”

Section: Borohydrides As Solid‐state Electrolytes For All‐solid‐statementioning

confidence: 99%

Borohydride‐Scaffolded Li/Na/Mg Fast Ionic Conductors for Promising Solid‐State Electrolytes

et al. 2018

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devices and for various types of consumer electronics. All-solid-state rechargeable batteries (ASSBs) utilizing solid-electrolyte separators rather than combustible liquid electrolytes possess the inherent advantages of enhanced safety and stability for state-of-the-art battery technologies. [1] Recently, ASSBs have attracted a resurgence of interest as ideal candidates for the next generation of electrochemicalenergy-storage devices. The superiority of ASSBs could be ascribed to the distinctive attributes of solid-state electrolytes (SSEs), including high Li-ion transference number and safety, and comparable ionic conductivity to their liquid counterparts. [2] The adoption of SSEs could offer new opportunities for the high-temperature electrical-energy-storage market and pave the way for the utilization of high-capacity electrodes, such as Li, Na, and sulfur. [2c,3] In contrast, in conventional batteries employing liquid electrolytes, the highcapacity electrodes may meet with detrimental side reactions, causing problems such as dendrite growth, reactivity, and/ or dissolution in the solvent. [4,5] With the construction of rigid solid electrolyte separators and stable interfaces in ASSBs, dendrite growth can be effectively mitigated, thus improving the safety of the batteries. [4,6] Owing to these benefits, in battery research, the number of studies on fabricating superionic SSEs has grown rapidly. Despite great progress gained these years, issues Borohydride solid-state electrolytes with room-temperature ionic conductivity up to ≈70 mS cm −1 have achieved impressive progress and quickly taken their place among the superionic conductive solid-state electrolytes. Here, the focus is on state-of-the-art developments in borohydride solid-state electrolytes, including their competitive ionic-conductive performance, current limitations for practical applications in solid-state batteries, and the strategies to address their problems. To open, fast Li/Na/Mg ionic conductivity in electrolytes with BH 4 − groups, approaches to engineering borohydrides with enhanced ionic conductivity, and later on the superionic conductivity of polyhedral borohydrides, their correlated conductive kinetics/thermodynamics, and the theoretically predicted high conductive derivatives are discussed. Furthermore, the validity of borohydride pairing with coated oxides, sulfur, organic electrodes, MgH 2 , TiS 2 , Li 4 Ti 5 O 12 , electrode materials, etc., is surveyed in solid-state batteries. From the viewpoint of compatible cathodes, the stable electrochemical windows of borohydride solid-state electrolytes, the electrode/electrolyte interface behavior and battery device design, and the performance optimization of borohydride-based solid-state batteries are also discussed in detail. A comprehensive coverage of emerging trends in borohydride solid-state electrolytes is provided and future maps to promote better performance of borohydride SSEs are sketched out, which will pave the way for their further development in the field of energy stora...

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“…[1][2][3] When crystalline porous materials are assembled from conjugated macrocycles, the preorganized molecular structures of the macrocycles allow for the design of unique pores with controls over important properties such as chemical composition, size and shape. [4,5] For instance, a naphthylene macrocycle, i. e., [6] cyclo-2,7-naphthylene ([6]CNAP), was found to be an effective molecular material for the negative electrodes of rechargeable lithium-ion batteries as it exhibits macrocyclic nanopores in crystals. [6] The columnar assembly of [6]CNAP molecules thus enabled lithium to reach at the stacking naphthylene panels, which resulted in a two-fold increase in capacity in comparison with that of conventional graphite materials.…”

Section: Introductionmentioning

confidence: 99%

“…[4,5] For instance, a naphthylene macrocycle, i. e., [6] cyclo-2,7-naphthylene ([6]CNAP), was found to be an effective molecular material for the negative electrodes of rechargeable lithium-ion batteries as it exhibits macrocyclic nanopores in crystals. [6] The columnar assembly of [6]CNAP molecules thus enabled lithium to reach at the stacking naphthylene panels, which resulted in a two-fold increase in capacity in comparison with that of conventional graphite materials. Although nanoporous cyclonaphthylene materials might be further exploited for use in other functional materials, columnar assembly of naphthylene macrocycles has not been ubiquitously achieved.…”

Section: Introductionmentioning

confidence: 99%

Crystalline Naphthylene Macrocycles Capturing Gaseous Small Molecules in Chiral Nanopores

Matsuno

Fukunaga

Kobayashi

et al. 2020

Chemistry An Asian Journal

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A series of chiral naphthylene macrocycles, [n]cycloepi-naphthylenes ([n]CeNAPs), possessing epi-linkages were synthesized by one-pot macrocyclization. With chiral (R)-or (S)-1,1'-linkages embedded in binaphthyl precursors, the macrocycles were assembled in polygonal structures possessing chiral hinges as corners. Among four chiral [n]CeNAP variants, [8]CeNAP with eight naphthylene panels formed robust columnar assemblies in crystals. The nanoporous crystals maintained a columnar assembly structure even after the removal of encapsulated solvent molecules, and their gas adsorption behavior was thoroughly investigated. Gas adsorption, including state-of-the-art in situ crystallographic analyses, revealed accurate atomic-level structures of the nanopores trapping gaseous N 2 molecules in chiral C 2 arrangements. With macrocycles as basic frameworks, functional nanopores may be exploited for chiral small-molecule alignments.

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Carbon‐Rich Active Materials with Macrocyclic Nanochannels for High‐Capacity Negative Electrodes in All‐Solid‐State Lithium Rechargeable Batteries

Cited by 36 publications

References 61 publications

Advancing Electrolytes Towards Stable Organic Batteries

Advancing Electrolytes Towards Stable Organic Batteries

Borohydride‐Scaffolded Li/Na/Mg Fast Ionic Conductors for Promising Solid‐State Electrolytes

Crystalline Naphthylene Macrocycles Capturing Gaseous Small Molecules in Chiral Nanopores

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