Benzylamine-directed growth of olivine-type LiMPO<sub>4</sub>nanoplates by a supercritical ethanol process for lithium-ion batteries

Truong, Quang Duc; Devaraju, Murukanahally Kempaiah; Honma, Itaru

doi:10.1039/c4ta03566f

Cited by 29 publications

(27 citation statements)

References 45 publications

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“…Particularly in the case of Li‐ion batteries, high rate capability is desired for applications in electric vehicles/hybrid electric vehicles to shorten the annoyingly long charging time and provide high power capability. 2D materials are regarded as a new strategy to improve the rate capability of electrode materials due to their high specific surface areas, which facilitate ultrashort lithium‐ion transport pathways compared to their corresponding bulk materials . So far, much research has been focused on using 2D materials as anode materials in Li‐ion batteries, including graphene, TiS 2 , Co 3 O 4 , SnO 2 , etc., while, for cathode materials, there are only a few reports on 2D LiFePO 4 materials with outstanding high‐rate performance and hybrid battery and supercapacitor behavior .…”

Section: Structure Parameters Of the Nanosheet Cathodesmentioning

confidence: 99%

Few Atomic Layered Lithium Cathode Materials to Achieve Ultrahigh Rate Capability in Lithium‐Ion Batteries

et al. 2017

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there are only a few reports on 2D LiFePO 4 materials with outstanding high-rate performance and hybrid battery and supercapacitor behavior. [9,[13][14][15] This is due to the fact that transition metals in cathode materials would undergo oxidation to higher valence states on the removal of lithium or other cations, [16] leading to large compositional changes and the consequent phase changes. Therefore, cathode materials require high structural stability to provide a high specific capacity at high charge and discharge rates, as well as suitable morphology and particle size. Nowadays, the challenge is to develop a versatile, scalable, highly efficient process to synthesize 2D cathode nanosheets, which could maintain their stable crystal structure and uniform microstructure over the long run.The current state-of-the-art cathode materials for Li-ion batteries mainly have three different type of structures, including layered (LiCoO 2 , LiNi 1/3 Mn 1/3 Co 1/3 O 2 , LiNiCoAlO 2 ), spinel (LiMn 2 O 4 ), and olivine-type (LiFePO 4 ) structures. (Please see Figure S1, Supporting Information.) Moreover, the diffusion direction of lithium in LiCoO 2 is octahedral site-tetrahedral site-octahedral site in layers, while that in LiMn 2 O 4 is tetrahedral siteoctahedral site-tetrahedral site with 3D channels, and the motion of lithium ions in LiFePO 4 occurs along 1D channels via nonlinear trajectory in the olivine crystal structure. [17] These different structures certainly will increase the difficulty of the synthesis of 2D cathode nanosheets. Thus, it is a challenge to adopt a general process to synthesize their 2D nanosheets from the corresponding particles with different crystal structures. In addition, the storage mechanisms of 2D layered lithium transition metal oxides or spinel LiMn 2 O 4 nanosheets still need investigation.Herein, we used an effective, easily scaled-up, and general synthetic process for the preparation of few-layered positive electrode nanosheets, which include layered LiCoO 2 , olivinetype LiFePO 4 , and spinel-type LiMn 2 O 4 . These prepared nanosheets showed highly oriented facets, which will have benefits for the lithium ion de-insertion/insertion during the charging/discharging process, respectively, thereby delivering high-energy densities and excellent rate capabilities. Also, the structural evolution of 2D cathode materials during galvanostatic charge-discharge was captured using time-resolved in situ synchrotron X-ray powder diffraction. The transport channels of 2D cathode materials would be opened up to different The most promising cathode materials, including LiCoO 2 (layered), LiMn 2 O 4 (spinel), and LiFePO 4 (olivine), have been the focus of intense research to develop rechargeable lithium-ion batteries (LIBs) for portable electronic devices. Sluggish lithium diffusion, however, and unsatisfactory long-term cycling performance still limit the development of present LIBs for several applications, such as plug-in/hybrid electric vehicles. Motivated by the success of graphene and novel 2D m...

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Section: Structure Parameters Of the Nanosheet Cathodesmentioning

confidence: 99%

Few Atomic Layered Lithium Cathode Materials to Achieve Ultrahigh Rate Capability in Lithium‐Ion Batteries

et al. 2017

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“…8,9 Inspired by the success of the commercial development of layered LiCoO 2 , researchers have extended their attention to olivine-structured orthophosphates (LiMPO 4 , where M ¼ Fe, Mn, Co, Ni) owing to their safety, abundant availability, practical discharge capacities as high as $170 mA h g À1 and good thermal stability even under vigorous conditions. [13][14][15] Additionally, LiNiPO 4 has the potential in energy storage not only for superior energy output (>10.7 W h) compared to commercial LiCoO 2 ($9.9 W h), but also for a lower cost at the same energy production than state-of-the-art cathodes. [13][14][15] Additionally, LiNiPO 4 has the potential in energy storage not only for superior energy output (>10.7 W h) compared to commercial LiCoO 2 ($9.9 W h), but also for a lower cost at the same energy production than state-of-the-art cathodes.…”

Section: Introductionmentioning

confidence: 99%

Designed synthesis of a unique single-crystal Fe-doped LiNiPO₄ nanomesh as an enhanced cathode for lithium ion batteries

et al. 2015

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In this report, a novel and unique single-crystal hierarchical Fe-doped LiNiPO 4 nanomesh is first devised and fabricated by a new strategy of super-low crystal mismatch between the precursor and the final sample through in situ doping at room temperature. The unique architecture obtained possesses numerous outstanding properties. Its special two-dimensional (2D) morphology can effectively help to shorten pathways for fast lithium ion diffusion and enlarge the exposed surface for more lithium-exchange channels. Furthermore, the hierarchical porous structure can be beneficial to the electrolyte's rapid diffusion and the Li ions' fast exchange as well as buffer the volume expansion. Importantly, Fe doping into LiNiPO 4 can significantly improve the electrical conductivity and the structural stability, so as to enhance Li storage performance. In this work, the systematic electrochemical performance of the LiNiPO 4 -based cathode is thoroughly presented for the first time, which represents a great breakthrough in high-voltage cathodes for LIBs.

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“…Organic solvent alkyl ethers could be used as electrolytes. Yang and co-authors introduced the triuoromethyl group into organic solvent alkyl ethers, and found that a mixture of diethylene glycol diethylether (15) and non-ammable methyl-nonauorobutyl ether (16) could be employed as electrolyte for lithium ion batteries (Scheme 9). 32 Compared with the conventional electrolytes, these electrolytes gave better rate, cycling and low-temperature performances for graphite/ LiFePO 4 cells.…”

Section: Methodsmentioning

confidence: 99%

“…For example, most inorganic compounds with high potential such as olivine-type LiNiPO 4 and LiCoPO 4 can be used as cathode materials. 15,16 Some organic compounds such as anthraquinone can be utilized to construct novel cathode materials. 17,18 Many inorganic compounds with low potential such as graphite and metal oxides are excellent candidates for anode materials.…”

Section: Introductionmentioning

confidence: 99%

Application of functionalized ether in lithium ion batteries

Song

2017

RSC Adv.

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Ethers can be typically categorized as chain ethers, aromatic ethers and crown ethers. Compounds with ether groups play an important role in chemistry, biology and functional materials. Ether acts as an anesthetic in medicine, and crown ethers are used to construct mechanically interlocked molecules.Lithium ion batteries are becoming more and more important in our modern life as our mobile devices such as smart phones and laptop computers need power supplies. In recent years, the ethers have been explored to improve the electrochemical properties of lithium ion batteries. Depending on the function of the ether groups, they are widely used as electrolytes, additives, binders, separators or anodes. In this paper, we review the progress that has been made in the use of functionalized ethers in lithium ion batteries and the synthesis strategies for them, and present the future research direction of functionalized ethers in lithium ion batteries.

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Benzylamine-directed growth of olivine-type LiMPO₄nanoplates by a supercritical ethanol process for lithium-ion batteries

Cited by 29 publications

References 45 publications

Few Atomic Layered Lithium Cathode Materials to Achieve Ultrahigh Rate Capability in Lithium‐Ion Batteries

Few Atomic Layered Lithium Cathode Materials to Achieve Ultrahigh Rate Capability in Lithium‐Ion Batteries

Designed synthesis of a unique single-crystal Fe-doped LiNiPO₄ nanomesh as an enhanced cathode for lithium ion batteries

Application of functionalized ether in lithium ion batteries

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Benzylamine-directed growth of olivine-type LiMPO4nanoplates by a supercritical ethanol process for lithium-ion batteries

Cited by 29 publications

References 45 publications

Few Atomic Layered Lithium Cathode Materials to Achieve Ultrahigh Rate Capability in Lithium‐Ion Batteries

Few Atomic Layered Lithium Cathode Materials to Achieve Ultrahigh Rate Capability in Lithium‐Ion Batteries

Designed synthesis of a unique single-crystal Fe-doped LiNiPO4 nanomesh as an enhanced cathode for lithium ion batteries

Application of functionalized ether in lithium ion batteries

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Product

Resources

About

Benzylamine-directed growth of olivine-type LiMPO₄nanoplates by a supercritical ethanol process for lithium-ion batteries

Designed synthesis of a unique single-crystal Fe-doped LiNiPO₄ nanomesh as an enhanced cathode for lithium ion batteries