Graphene-Like-Graphite as Fast-Chargeable and High-Capacity Anode Materials for Lithium Ion Batteries

Cheng, Qian; Okamoto, Yasuharu; Tamura, Noriyuki; Tsuji, Masayoshi; Maruyama, Shunya; Matsuo, Yoshiaki

doi:10.1038/s41598-017-14504-8

Cited by 137 publications

(104 citation statements)

References 57 publications

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“…In this figure The above results are very important in considering the origin of the unexpectedly low coulombic efficiency of GLG samples of around 50-56% independent of the oxygen content in them. Considering that the thickness of SEI layers formed on A-GLG800 was not so large based on the XPS measurement, 5 the gradual increase in the interlayer spacing of GLG samples observed here is one of the main reasons for their low coulombic efficiency. The surface of GLG samples would not be fully covered with SEI during the increase in the interlayer spacing, resulting in the continuous decomposition of solvent molecules.…”

Section: Resultsmentioning

confidence: 70%

“…On the other hand, in the case of Li 16 C 136 O 8 with a higher loading of lithium ions, the interlayer spacing further increased to 0.363 nm and some of the oxygen atoms slightly moved toward the interlayer space as was observed for GLG with higher lithium content observed in our previous study. 5 This result also indicates that it is reasonable to think that high stage compounds were formed at the beginning of the electrochemical lithium storage in GLG. Figure 4 shows the X-ray diffraction patterns of A-GLG800 charged to various cell voltages, including those shown in Fig.…”

Section: Resultsmentioning

confidence: 76%

“…However, the stage transformation phenomenon as shown above was not observed for these samples. This indicates that the present A-GLG800 with three-dimensional stacking regularity of carbon layers 5 possesses graphite like nature though it contains a considerable amount of oxygen and the interlayer spacing of it is slightly larger than that of graphite. Figure 6A shows the variation of open circuit voltage of A-GLG800 electrode during the intermittent charging as a function of time.…”

Section: Resultsmentioning

confidence: 78%

“…4I and 4K). 5 At 0.8 V, the diffraction peak due to pristine GLG almost disappeared and that due to lithium intercalated A-GLG800 slightly shifted to a lower angle of 2θ = 25.5…”

Section: Resultsmentioning

confidence: 97%

“…We have reported that lithium ions are intercalated into it at a higher cell voltage of 0.48 V and the interlayer spacing reached a very large value of 0.48 nm at 0 V. We have also found that all of the lithium species stored in fully charged GLG are in the ionic state, based on the 7 Li NMR measurement. 5 However, the intercalation behavior of lithium ions into GLG especially at the early stages of it has not yet been studied, which would be strongly related to the formation of SEI. Moreover, the mechanism of lithium storage in graphene-based carbons is not well understood because of their poor structural regularity, except for the results reported by Wang et al 11 They have indicated that lithium ions are intercalated between carbon layers, based on the TEM observation of lithium introduced nitrogen doped graphene operated in an all-solid-state cell.…”

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confidence: 99%

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Electrochemical Intercalation Behaviors of Lithium Ions into Graphene-Like Graphite

Matsuo

Sasaki

Maruyama

et al. 2018

J. Electrochem. Soc.

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Electrochemical intercalation behaviors of lithium ions into graphene-like graphite (GLG) were investigated at high cell voltages. The interlayer spacing of GLG started to increase at much higher cell voltages than that needed for graphite. It stepwisely increased at a decrease in the cell voltages, indicating the staging phenomenon. The thermodynamic considerations suggested that the strong interaction between oxygen atoms introduced in GLG and lithium ions is responsible for the formation of intercalation compounds of desolvated lithium ions. The interlayer distance of GLG was more important than the content of oxygen in it for the decreased separation energy of carbon layers and, accordingly, for the onset voltage of the intercalation of lithium ions into it. The intercalation of desolvated lithium ions into GLG was achieved even in an electrolyte solution containing dimethoxyethane in which solvents are co-intercalated into graphite. Graphite has been widely used as an anode for lithium ion batteries for portable devices such as laptop computers, cell phones, etc. However, its limited theoretical capacity of 372 mAh/g and relatively poor rate performance are not suitable for use in electric vehicles, etc. In this context, graphene-based carbon materials showing high capacity and rate performance have been introduced and widely studied. [1][2][3][4] However, because of the intrinsically high surface area of graphenebased carbons, they suffer from low columbic efficiency. We have recently introduced graphene-like graphite (GLG) as a superior anode material for lithium ion batteries, showing a high capacity of 608 mAh/g with a cut off voltage of 2 V, high rate performance (the ratio of the capacity at 6 C and 0.1 C rates of 79%), and good cycling properties.5 This material is prepared from the thermal reduction of graphite oxide at 800• C, carefully avoiding the exfoliation of the carbon layers. The regularity of the stacking of carbon layers of GLG is also quite high and the surface area is low. Moreover, the morphology and interlayer spacing of it are similar to those of graphite, though it contains considerable amounts of oxygen and pores with the size of 1-5 nm within carbon layers mainly in the state of C-O-C. The lithium storage capacity of GLG is strongly related to the oxygen content and the large expansion of interlayer spacing during the intercalation of lithium ions was ascribed to the high capacity, reaching 673 mAh/g of discharge capacity. 6,7 The coulombic efficiency of GLG was higher than those reported for graphene-based carbons, however, was still not enough high (50-56% with a cutoff voltage of 2 V). In the case of a graphite anode operated in an ethylene carbonate based electrolyte solution, solvated lithium ions are first intercalated into it and then the solvent molecules are reduced to form a lithium ion conducting passivation layer so called solid electrolyte interphase (SEI) at higher potential regions of around 0.8 V vs Li/Li + . This SEI layer effectively prevents the further decomposi...

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Section: Resultsmentioning

confidence: 70%

Section: Resultsmentioning

confidence: 76%

Section: Resultsmentioning

confidence: 78%

“…4I and 4K). 5 At 0.8 V, the diffraction peak due to pristine GLG almost disappeared and that due to lithium intercalated A-GLG800 slightly shifted to a lower angle of 2θ = 25.5…”

Section: Resultsmentioning

confidence: 97%

mentioning

confidence: 99%

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Electrochemical Intercalation Behaviors of Lithium Ions into Graphene-Like Graphite

Matsuo

Sasaki

Maruyama

et al. 2018

J. Electrochem. Soc.

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The Role of Graphene and Other 2D Materials in Solar Photovoltaics

et al. 2018

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2D materials have attracted considerable attention due to their exciting optical and electronic properties, and demonstrate immense potential for next-generation solar cells and other optoelectronic devices. With the scaling trends in photovoltaics moving toward thinner active materials, the atomically thin bodies and high flexibility of 2D materials make them the obvious choice for integration with future-generation photovoltaic technology. Not only can graphene, with its high transparency and conductivity, be used as the electrodes in solar cells, but also its ambipolar electrical transport enables it to serve as both the anode and the cathode. 2D materials beyond graphene, such as transition-metal dichalcogenides, are direct-bandgap semiconductors at the monolayer level, and they can be used as the active layer in ultrathin flexible solar cells. However, since no 2D material has been featured in the roadmap of standard photovoltaic technologies, a proper synergy is still lacking between the recently growing 2D community and the conventional solar community. A comprehensive review on the current state-of-the-art of 2D-materials-based solar photovoltaics is presented here so that the recent advances of 2D materials for solar cells can be employed for formulating the future roadmap of various photovoltaic technologies.

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MXene‐Based Composites: Synthesis and Applications in Rechargeable Batteries and Supercapacitors

Yang

Bao

Jaumaux

et al. 2019

Adv Materials Inter

257

142

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The family of 2D transition metal carbides, nitrides, and carbonitrides (collectively called MXenes) is rapidly studied since the initial synthesis of Ti3C2Tx (MXene). The surface of MXenes etched by hydrofluoric acid has hydrophilic groups (F, OH, and O), which leads the surface to be negatively charged. Consequently, the negatively charged surface can facilitate the compounding of MXenes with other positively charged materials and prevent MXenes from aggregating with some negatively charged substances, thus promoting the formation of a stable dispersion. The MXene‐based composites have better electrochemical performance than both precursors due to synergistic effects. This review elaborates and discusses the development of MXene‐based composites. It is aimed to summarize the various methods of fabricating MXene‐based composites. The applications of MXene‐based composites in batteries and supercapacitors are presented along with analysis of their excellent electrochemical performances. Finally, the authors propose the approach for further enhancing the electrochemical performances of MXene‐based composite electrode materials.

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Graphene-Like-Graphite as Fast-Chargeable and High-Capacity Anode Materials for Lithium Ion Batteries

Cited by 137 publications

References 57 publications

Electrochemical Intercalation Behaviors of Lithium Ions into Graphene-Like Graphite

Electrochemical Intercalation Behaviors of Lithium Ions into Graphene-Like Graphite

The Role of Graphene and Other 2D Materials in Solar Photovoltaics

MXene‐Based Composites: Synthesis and Applications in Rechargeable Batteries and Supercapacitors

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