Thickness-control of ultrathin bimetallic Fe–Mo selenide@N-doped carbon core/shell “nano-crisps” for high-performance potassium-ion batteries

Chu, Jianhua; Yu, Qiyao; Yang, Dexin; Lü, Xing; Lao, Cheng‐Yen; Wang, Min; Han, Kun; Liu, Zhiwei; Zhang, Lin; Du, Wenya; Xi, Kai; Bao, Yanping; Wang, Wei

doi:10.1016/j.apmt.2018.10.004

Cited by 69 publications

(51 citation statements)

References 58 publications

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“…As shown in Figure S20 (Supporting Information), the high‐resolution Se 3d spectrum of pristine EF‐TNS is mainly composed of TaNi 2 Se 5 , as evidenced by the Se 3d peak located at 56.2 eV, ascribed to the Se 2− in TaNi 2 Se 5 . After a partial discharge to 1.2 V, the intensity of Se 3d 3/2 peak located at 56.2 eV decreases, and a new peak located 54.2 eV Se 3d 5/2 occurs, corresponding to a KSe compound . It indicates K + ion absorption/or intercalation during the potassiation process.…”

Section: Resultsmentioning

confidence: 94%

Unlocking Few‐Layered Ternary Chalcogenides for High‐Performance Potassium‐Ion Storage

Tian

Shao

et al. 2019

Advanced Energy Materials

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ability and charge transport behaviors of alkali metal ions (Li + , Na + , K + ). [7] Recently, tremen dous attention has been paid to the binary 2D layered TMDs, MX 2 (M = V, Ti, Zr, Ta, Nb, Mo, W; X = S, Se, Te, etc.) for Li + -/Na + -ion batteries (LIBs/SIBs). [8] However, compared with LIBs and SIBs, potassium-ion batteries (KIBs) are an appealing alternative because of abundant potassium resources (the seventh most abundant element in the earth's crust, 2.09% in weight) and lower redox potential of K + /K than that of Na + /Na (−2.93 V vs −2.71 V, Figure S1, Supporting Information). Therefore, KIBs could have lower production cost and higher operating voltage plateau for achieving high energy density in batteries. [9,10] However, compared with Li + or Na + ions, K + ions (with an ionic radius of 1.4 Å) are much larger than Li + ions (0.76 Å) or Na + ions (1.02 Å), which induces sluggish potassiation kinetics and an inferior K + ion transfer and storage. [11] So far, only a few binary TMDs cathode materials (i.e., TiS 2 , [12,13] TiSe 2 [14] ) and anode materials (i.e., VSe 2 , [15] ReS 2 , [16] MoS 2 , [17,18] VS 2 , [19] MoSe 2 [20] ) for KIBs have been reported. Up to date, the majority of TMDs research for KIBs has only focused on the design and preparation of binary layered 2D materials for achieving competitive electrochemical performances. [14,20] For example, Loh and co-workers reported that potassium-intercalated TiS 2 (K x TiS 2 , 0 ≤ x ≤ 0.88) cathode materials could provide a reversible specific capacity of 145 mAh g −1 with a good stability after 120 cycles. [13] A novel MoSe 2 /N-doped Potassium-ion batteries (KIBs) have attracted increasing attention for grid-scale energy storage due to the abundance of potassium resources, low cost, and competitive energy density. The key challenge for KIBs is to develop highperformance electrode materials. However, the exploration of high-capacity and ultrastable electrodes for KIBs remains challenging because of the sluggish diffusion kinetics of K + ions during the charging/discharging processes. This study reports for the first time a facile ion-intercalation-mediated exfoliation method with Mg 2+ cations and NO 3anions as ion assistants for the fabrication of expanded few-layered ternary Ta 2 NiSe 5 (EF-TNS) flakes with interlayer spacing up to 1.1 nm and abundant Se sites (NiSe 4 tetrahedra/TaSe 6 octahedra clusters) for superior potassium-ion storage. The EF-TNS deliver a high capacity of 315 mAh g -1 , excellent rate capability (121 mAh g -1 at a current density of 1000 mA g -1 ), and ultrastable cycling performance (81.4% capacity retention after 1100 cycles). Detailed theoretical analysis via first-principles calculations and experimental results elucidate that K + ions intercalate through the expanded interlayers effectively and prefer to transport along zigzag pathways in layered Ta 2 NiSe 5 . This work provides a new avenue for designing novel ternary intercalation/pseudocapacitance-type KIBs with high capacity, excellent rate capability, and supe...

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Section: Resultsmentioning

confidence: 94%

Unlocking Few‐Layered Ternary Chalcogenides for High‐Performance Potassium‐Ion Storage

Tian

Shao

et al. 2019

Advanced Energy Materials

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“…In comparison with other reported anodes for KIBs, in particular, the CFSe/C delivers higher capacity as well as excellent stability at high current densities (Table S1, Supporting Information). [39][40][41]51,[53][54][55][56] The charge storage kinetics of CFSe/C-250, -300, and -500 composites are further examined by CV tests at various scan rates from 0.1 to 2.0 mV s -1 (Figures 8 and 9). As the scan rate increases, the cathodic/anodic peaks of the composites gradually deviate from the original potential owing to the ohmic resistance (Figure 8a-c).…”

Section: Resultsmentioning

confidence: 99%

Conversion Reaction Mechanism of Ultrafine Bimetallic Co‐Fe Selenides Embedded in Hollow Mesoporous Carbon Nanospheres and Their Excellent K‐Ion Storage Performance

Yang

Kang

Park

et al. 2020

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Potassium‐ion batteries (KIBs) are considered as promising alternatives to lithium‐ion batteries owing to the abundance and affordability of potassium. However, the development of suitable electrode materials that can stably store large‐sized K ions remains a challenge. This study proposes a facile impregnation method for synthesizing ultrafine cobalt–iron bimetallic selenides embedded in hollow mesoporous carbon nanospheres (HMCSs) as superior anodes for KIBs. This involves loading metal precursors into HMCS templates using a repeated “drop and drying” process followed by selenization at various temperatures, facilitating not only the preparation of bimetallic selenide/carbon composites but also controlling their structures. HMCSs serve as structural skeletons, conductive templates, and vehicles to restrain the overgrowth of bimetallic selenide particles during thermal treatment. Various analysis strategies are employed to investigate the charge–discharge mechanism of the new bimetallic selenide anodes. This unique‐structured composite exhibits a high discharge capacity (485 mA h g−1 at 0.1 A g−1 after 200 cycles) and enhanced rate capability (272 mA h g−1 at 2.0 A g−1) as a promising anode material for KIBs. Furthermore, the electrochemical properties of various nanostructures, from hollow to frog egg‐like structures, obtained by adjusting the selenization temperature, are compared.

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“…During recent years, potassium‐ion energy storage system including potassium‐ion batteries (PIBs) and potassium‐ion hybrid supercapacitors (PIHCs) is attracting more attentions because of the abundant potassium resources and the standard redox potential of K/K + (−2.92 V) close to Li/Li + (−3.04 V) . To date, a variety of potential electrode materials, including carbon materials (graphite, porous carbon, graphene, and carbon nanotubes) and metal‐based compounds, have been explored for PIB anodes . However, the reversible capacity and the cycling stability of most materials are still unsatisfactory to meet the requirements of high energy density storage devices .…”

Section: Introductionmentioning

confidence: 99%

Controlled Design of Well‐Dispersed Ultrathin MoS₂ Nanosheets inside Hollow Carbon Skeleton: Toward Fast Potassium Storage by Constructing Spacious “Houses” for K Ions

Cui

Liu

Feng

et al. 2020

Adv Funct Materials

143

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The large volume expansion induced by K+ intercalation is always a big challenge for designing high‐performance electrode materials in potassium‐ion storage system. Based on the idea that large‐sized ions should accommodate big “houses,” a facile‐induced growth strategy is proposed to achieve the self‐loading of MoS2 clusters inside a hollow tubular carbon skeleton (HTCS). Meantime, a step‐by‐step intercalation technology is employed to tune the interlayer distance and the layer number of MoS2. Based on the above, the ED‐MoS2@CT hybrids are achieved by self‐loading and anchoring the well‐dispersed ultrathin MoS2 nanosheets on the inner surface of HTCSs. This unique compositing model not only alleviates the mechanical strain efficiently, but also provides spacious “roads” (hollow tubular carbon skeleton) and “houses” (interlayer expanded ultrathin MoS2 sheets) for fast K+ transition and storage. As an anode of potassium‐ion batteries, the resultant ED‐MoS2@CT electrode delivers a high specific capacity of 148.5 mAh g−1 at 2 A g−1 after 10 000 cycles with only 0.002% fading per cycle. The assembled ED‐MoS2@CT//PC potassium‐ion hybrid supercapacitor device shows a high energy density of 148 Wh kg−1 at a power density of 965 W kg−1, which is comparable to that of lithium‐ion hybrid supercapacitors.

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Thickness-control of ultrathin bimetallic Fe–Mo selenide@N-doped carbon core/shell “nano-crisps” for high-performance potassium-ion batteries

Cited by 69 publications

References 58 publications

Unlocking Few‐Layered Ternary Chalcogenides for High‐Performance Potassium‐Ion Storage

Unlocking Few‐Layered Ternary Chalcogenides for High‐Performance Potassium‐Ion Storage

Conversion Reaction Mechanism of Ultrafine Bimetallic Co‐Fe Selenides Embedded in Hollow Mesoporous Carbon Nanospheres and Their Excellent K‐Ion Storage Performance

Controlled Design of Well‐Dispersed Ultrathin MoS₂ Nanosheets inside Hollow Carbon Skeleton: Toward Fast Potassium Storage by Constructing Spacious “Houses” for K Ions

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Thickness-control of ultrathin bimetallic Fe–Mo selenide@N-doped carbon core/shell “nano-crisps” for high-performance potassium-ion batteries

Cited by 69 publications

References 58 publications

Unlocking Few‐Layered Ternary Chalcogenides for High‐Performance Potassium‐Ion Storage

Unlocking Few‐Layered Ternary Chalcogenides for High‐Performance Potassium‐Ion Storage

Conversion Reaction Mechanism of Ultrafine Bimetallic Co‐Fe Selenides Embedded in Hollow Mesoporous Carbon Nanospheres and Their Excellent K‐Ion Storage Performance

Controlled Design of Well‐Dispersed Ultrathin MoS2 Nanosheets inside Hollow Carbon Skeleton: Toward Fast Potassium Storage by Constructing Spacious “Houses” for K Ions

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Controlled Design of Well‐Dispersed Ultrathin MoS₂ Nanosheets inside Hollow Carbon Skeleton: Toward Fast Potassium Storage by Constructing Spacious “Houses” for K Ions