Influence of Li diffusion distance on the negative electrode properties of Si thin flakes for Li secondary batteries

Saito, Morihiro; Yamada, Tomoyuki; Yodoya, Chihiro; Kamei, Akika; Hirota, Masato; Takenaka, Tohru; Tasaka, Akimasa; Inaba, Masaaki

doi:10.1016/j.ssi.2011.12.016

Cited by 36 publications

(27 citation statements)

References 25 publications

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“…We designed an amorphous Si nano-flake powder (Si Leaf Power, Si-LP μ , Oike & Co., Ltd., Japan), of which the lateral dimension and thickness were 3-5 µm and 100 nm, respectively, and demonstrated superior cycle performance of the Si-LP anodes. [6][7][8] On the other hand, elemental sulfur is a promising cathode material with a high capacity, and hence the combination of Si and S, i.e., silicon-sulfur battery, is one of the promising battery system with a very high energy density in the future. However, the sulfur cathodes have a serious problem.…”

Section: Introductionmentioning

confidence: 99%

Cycle Performances of Si-flake-powder Anodes in Lithium Salt-tetraglyme Complex Electrolytes

et al. 2015

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Charge and discharge properties of amorphous Si nano-flake powder (Si Leaf Powder ® , Si-LP) in lithium bis(trifluoromethanesulfonyl)amide-tetraglyme complex electrolyte, [Li(G4)][TFSA], were investigated for use as an anode in silicon-sulfur battery. Though a high reversible capacity (2,300-2,700 mAh g, the overpotential gradually increased upon cycling. The increase in overpotential was reduced by dilution with 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether. The addition of fluoroethylene carbonate (FEC) further reduced the overpotential and improved cycleability. Electrochemical impedance spectroscopy analysis revealed that the observed improvements in charge and discharge characteristics are due to the formation of solid electrolyte interface layer with a high ionic-conductivity in the presence of FEC.

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Section: Introductionmentioning

confidence: 99%

Cycle Performances of Si-flake-powder Anodes in Lithium Salt-tetraglyme Complex Electrolytes

et al. 2015

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“…2,500 mAh g ¹1 with superior capacity retention without using matrix materials such as SiO 2 and carbon. 25 In addition to the poor capacity retention, Si anodes have several serious problems such as large irreversible capacity, ceaseless electrolyte decomposition, swelling of the electrode, etc. for use in high-energy density LIBs in the next generation.…”

Section: ¹3mentioning

confidence: 99%

“…Furthermore, the high specific surface area of these materials causes a large irreversible capacity and poor safety. We designed Si nano-flakes to overcome these problems and developed Si LeafPowder μ (Si-LP) in collaboration with OIKE & Co., Ltd. [21][22][23][24][25] The Si-LP is prepared with an electron-beam evaporation method, 26 and has an amorphous structure. It has a nano-flake structure, in which the thickness is typically 100 nm and the particle size in the lateral dimensions is in the range of 3-5 µm as shown in Fig.…”

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confidence: 99%

Silicon Nano-flake Powder as an Anode for The Next Generation Lithium-ion Batteries: Current Status and Challenges

et al. 2017

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Silicon is electrochemically alloyed and de-alloyed with Li at potentials close to Li + /Li and is widely recognized as the most promising candidate for the anode of LIBs with a high energy density (250-300 Wh kg −1 ) in the next generation. The most serious issue of Si anode is poor capacity retention owing to large volume changes during charging and discharging. We developed Si LeafPowder ® with a nano-flake structure to overcome the poor capacity retention. However Si anodes still have some problems such as large irreversible capacity, ceaseless electrolyte decomposition, swelling of the electrode, etc. for use in high-energy density LIBs in the next generation. In this article, these problems and the challenges to mitigate them are overviewed based on our resent data obtained by Si nano-flakes (Si LeafPowder ® ).

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“…24,26 Recently, amorphous Si nanoflake powder (Si LeafPowder μ , denoted as Si-LP) with thickness of 50-200 nm has been developed. 27,28 The short Li diffusion length facilitates uniform distribution of Li on thin Si-LP during alloying and de-alloying. This facilitates relaxation of the stress of volume change of Si, thus reducing of mechanical degradation of Si-LP and rendering good charge-discharge cycle stability to the cell.…”

Section: Introductionmentioning

confidence: 99%

Si/Li<sub>2</sub>S Battery with Solvate Ionic Liquid Electrolyte

Kamei

Haruta

et al. 2016

Electrochemistry

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A lithium-sulfur cell was developed, consisting of a Si nanoflake negative electrode, a Li 2 S/graphene positive electrode, and a non-flammable solvate ionic liquid electrolyte. This cell configuration allows us to avoid the use of Li metal electrode and the concomitant dendritic deposition of Li metal at the negative electrode during charging, thereby rendering the cell operation highly safe and stable. The solvate ionic liquid electrolyte solution was composed of tetraglyme, lithium bis(trifluoromethanesulfonyl)amide, and a hydrofluoroether. The solubility of lithium polysulfide (reaction intermediate of the positive electrode) is very low, resulting in high Coulombic efficiency of discharge/charge and long cycle life of the Si/Li 2 S cell.

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Influence of Li diffusion distance on the negative electrode properties of Si thin flakes for Li secondary batteries

Cited by 36 publications

References 25 publications

Cycle Performances of Si-flake-powder Anodes in Lithium Salt-tetraglyme Complex Electrolytes

Cycle Performances of Si-flake-powder Anodes in Lithium Salt-tetraglyme Complex Electrolytes

Silicon Nano-flake Powder as an Anode for The Next Generation Lithium-ion Batteries: Current Status and Challenges

Si/Li<sub>2</sub>S Battery with Solvate Ionic Liquid Electrolyte

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