Water Splitting: Tuning Unique Peapod‐Like Co(SxSe1–x)2 Nanoparticles for Efficient Overall Water Splitting (Adv. Funct. Mater. 24/2017)

Fang, Ling; Li, Wenxiang; Guan, Yongxin; Feng, Yangyang; Zhang, Huijuan; Wang, Shilong; Wang, Yu

doi:10.1002/adfm.201770147

Cited by 115 publications

(144 citation statements)

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“…[129][130][131] For these, Sun et al proposed a core-shell (CS) structured cathode materials with Ni-rich core and Mn-rich shells to simultaneously ensure the structural and thermal stability. [132] Apparently, the core-shell structured cathodes achieved the superior thermal stability.…”

Section: Concentration Gradientmentioning

confidence: 99%

Prospect and Reality of Ni‐Rich Cathode for Commercialization

Kim

Lee

Cha

et al. 2017

Advanced Energy Materials

665

582

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practical candidate for the wide application of the LIBs with respect to the reversible capacity, rate capability, and capital cost. [4][5][6][7] In terms of nickel contents, the nickel-rich cathodes with nickel content above 80% have advantages in gravimetric capacity, allowing high gravimetric energy density, compared with the nickel content less than 80%. Currently, the nickel-rich cathodes with the amount of nickel less than 60% are fully commercialized. However, the nickel-rich cathodes with nickel content of ≥80% still have many difficulties in the commercialization with respect to powder properties and electrode fabrication process.The unstable powder properties originate from residual lithium compounds such as LiOH and Li 2 CO 3 that formed by the spontaneous reduction of sensitive trivalent nickel ions during the synthesis process and storage in air. [8][9][10][11] The Li 2 CO 3 significantly promotes the gas evolution and increase the moisture of the cathode powder, which strongly related to the safety issue. [12][13][14] Furthermore, the LiOH on the cathode increases the powder pH value, causing the gelation of the slurry during the electrode fabrication process. The nickel-rich cathode with nickel content of ≤60% have acceptable amount of residual lithium compounds for the practical use. By contrast, the cathode with amount of nickel of ≥80% should be treated by additional process to reduce the residual lithium compounds ( Table 1). Furthermore, other powder properties, such as powder pH and moisture, should be carefully controlled when nickel contents were exceeded of ≥80%. Thus, for the practical application of these cathode materials, most battery companies have adapted the washing process, in which the cathode power was stirred in purified water for 20-40 min. [15,16] The washing process could greatly reduce the residual lithium compounds and powder pH value. [15] However, the washing process not only increases process time and capital cost but also make the nickel-rich cathode more chemically sensitive than nonwashed cathodes. [16] More seriously, the water washing deteriorates the thermal stability of the nickel-rich cathodes, indicating that the washing process should be substituted by other methods for the battery safety.Another important factor for the commercialization of the nickel-rich cathodes is the electrode density directly related to the energy density. In general, the nickel-rich cathodesThe layered nickel-rich cathode materials are considered as promising cathode materials for lithium-ion batteries (LIBs) due to their high reversible capacity and low cost. However, several significant challenges, such as the unstable powder properties and limited electrode density, hindered the practical application of the nickel-rich cathode materials with the nickel content over 80%. Herein, important stability issues and in-depth understanding of the nickel-rich cathode materials on the basis of the industrial electrode fabrication condition for the commercialization of the nickel-rich cathode m...

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Section: Concentration Gradientmentioning

confidence: 99%

Prospect and Reality of Ni‐Rich Cathode for Commercialization

Kim

Lee

Cha

et al. 2017

Advanced Energy Materials

665

582

View full text Add to dashboard Cite

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“…Coating with uorides inactive to HF provides an available method to protect active materials and decrease the interfacial charge transfer resistance. 120 Wu et al 161 (Fig. 9).…”

Section: Fluoride/phosphate Coatingsmentioning

confidence: 95%

“…Surface coating on active materials or the electrode could achieve this goal to some extent, because the outer layer forms a stable solid-electrolyte interphase that could protect Mn from dissolving into the electrolyte, protect the active materials from contact with HF acid, and improve the rate of lithium ion insertion and de-insertion. Wang et al 120 summarized the application of surface and interface engineering in Li-ion batteries, and analyzed surface modications from active surface and surface functionalization perspectives. Carbon (including organic compounds), lithium-metal-oxygen, metal oxides (Al 2 O 3 , MnO 2 , ZrO 2 , ZnO, TiO 2 , etc.…”

Section: Surface Coatingmentioning

confidence: 99%

Research progress on design strategies, synthesis and performance of LiMn₂O₄-based cathodes

Mao

Guo

2015

RSC Adv.

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Spinel LiMn2O4 (LMO)-based composites, due to their combination of low toxicity, abundant natural resources, and excellent electrochemical performance, are regarded as promising candidate cathode materials for lithium ion batteries. Current energy storage demands are not being met with existing materials, however, because of their defects, such as fast capacity fading, low rate capability, and low specific capacity in practical applications. Manganese dissolution during electrochemical processes bears the major responsibility for capacity loss, apart from the electrolyte factor. Low electrical conductivity, low ionic diffusion efficiency, and large structural variation have adverse effects on the electrochemical performance of materials. With respect to these drawbacks, significant progress has been made recently on optimizing the performance of LMO-based cathode materials. In this work, we review recent progress in 1 structural design, designing composites with graphene/carbon nanotubes, crystalline doping, and coatings for improving the electrochemical performance of these cathode materials. Spinel LiMn 2 O 4 (LMO)-based composites, due to their combination of low toxicity, abundant natural resources, and excellent electrochemical performance, are regarded as promising candidate cathode materials for lithium ion batteries. Current energy storage demands are not being met with existing materials, however, because of their defects, such as fast capacity fading, low rate capability, and low specific capacity in practical applications. Manganese dissolution during electrochemical processes bears the major responsibility for capacity loss, apart from the electrolyte factor. Low electrical conductivity, low ionic diffusion efficiency, and large structural variation have adverse effects on the electrochemical performance of materials. With respect to these drawbacks, significant progress has been made recently on optimizing the performance of LMO-based cathode materials. In this work, we review recent progress in 1 structural design, designing composites with graphene/carbon nanotubes, crystalline doping, and coatings for improving the electrochemical performance of these cathode materials.

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“…z E-mail: h-nara@aoni.waseda.jp; osakatets@waseda.jp polysulfide intermediates (Li 2 S x where x represents a value between 4 and 8), 13 and low sulfur loading in the cathode. 14 Nazar et al proposed the combination of sulfur with an ordered mesoporous carbon material as a host supporting the sulfur, in order to improve the ionic and electronic conductivity of the cathode.…”

mentioning

confidence: 99%

The Potential for the Creation of a High Areal Capacity Lithium-Sulfur Battery Using a Metal Foam Current Collector

Nara

Yokoshima

Mikuriya

et al. 2016

J. Electrochem. Soc.

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A high areal capacity lithium-sulfur battery making use of mass produced aluminum metal foam as a current collector was investigated. A sulfur/Ketjenblack (KB) composite was filled and deposited into the aluminum foam current collector via a predetermined filling procedure, resulting in high sulfur loading. The value for this loading was found to be 17.7 mg sulfur/cm 2 by using carboxymethyl cellulose and styrene butadiene rubber (CMC + SBR) as a binder. An operating single-layer pouch-type cell with an S/KB-CMC+SBR on Al foam cathode was created as a result of this synthesis and found to possess an unprecedentedly high areal capacity of 21.9 mAh/cm 2 . On the basis of the achieved areal capacity, the energy density of a theoretical lithium-sulfur battery was estimated with the assumption of an electrolyte/sulfur ratio of 2.7 μL/mg. This was calculated upon 100% of the pore volume in the S/KB-CMC + SBR on Al foam cathodes and polyolefin separator, along with the inclusion of the weights of the tabs for the current lead and pouch film packaging in the case of a seven-layer pouch-type battery. With this calculation, it was determined that the creation of a lithium-sulfur battery with an energy density of greater than 200 Wh/kg is plausible. Since the commercial launch of the lithium ion battery (LIB) by Sony in 1991, 1 the range of application of this type of battery has been broadened for use in everything from small portable electronic devices to large electric vehicles and stationary batteries capable of storing the power generated by means of solar and wind sources. Such an expansion in the range of applications for LIBs requires them to possess a high energy density, remain safe to use, and to manufactured at a low cost. Considering the requirement for high energy density, there are two general methods by which this can be achieved: increasing the operating voltage or increasing the capacity.Considering the first method, the use of high operating potential cathodes such as spinel (LiNi 0.5 Mn 1.5 O 4 ), 2 olivine-type (LiCoPO 4 3 and LiNiPO 4 4 ), and fluoride phosphate (Li 2 CoPO 4 F) 5 have been investigated. Such cathode materials are promising for use in transportation applications because of both their high operating potential and high volumetric energy density.Considering high capacity cathodes, both sulfur (1675 mAh/g) 6,7 and air cathodes [8][9][10][11] have been investigated. These cathodes possess extremely high capacities with the ability to overcome the shortcoming of their low operating potential, thereby increasing their energy density. Issues arise, however, with the use of the air cathode with a lithium metal anode, which include poor reversibility of the discharged product, the occurrence of a high over-potential during charging and discharging, and the penetration of ambient air into the system resulting in the degradation of lithium metal by moisture.In comparison with the air cathode, the sulfur cathode seems to be a more promising candidate for its use as a high capacity cathode. The su...

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Water Splitting: Tuning Unique Peapod‐Like Co(S_xSe_1–_x)₂ Nanoparticles for Efficient Overall Water Splitting (Adv. Funct. Mater. 24/2017)

Cited by 115 publications

References 0 publications

Prospect and Reality of Ni‐Rich Cathode for Commercialization

Prospect and Reality of Ni‐Rich Cathode for Commercialization

Research progress on design strategies, synthesis and performance of LiMn₂O₄-based cathodes

The Potential for the Creation of a High Areal Capacity Lithium-Sulfur Battery Using a Metal Foam Current Collector

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Water Splitting: Tuning Unique Peapod‐Like Co(SxSe1–x)2 Nanoparticles for Efficient Overall Water Splitting (Adv. Funct. Mater. 24/2017)

Cited by 115 publications

References 0 publications

Prospect and Reality of Ni‐Rich Cathode for Commercialization

Prospect and Reality of Ni‐Rich Cathode for Commercialization

Research progress on design strategies, synthesis and performance of LiMn2O4-based cathodes

The Potential for the Creation of a High Areal Capacity Lithium-Sulfur Battery Using a Metal Foam Current Collector

Contact Info

Product

Resources

About

Water Splitting: Tuning Unique Peapod‐Like Co(S_xSe_1–_x)₂ Nanoparticles for Efficient Overall Water Splitting (Adv. Funct. Mater. 24/2017)

Research progress on design strategies, synthesis and performance of LiMn₂O₄-based cathodes