Amorphous LiCoO 2 Li 2 SO 4 active materials: Potential positive electrodes for bulk-type all-oxide solid-state lithium batteries with high energy density

Nagao, Kenji; Hayashi, Akitoshi; Deguchi, Minako; Tsukasaki, Hirofumi; Mori, Shigeo; Tatsumisago, Masahiro

doi:10.1016/j.jpowsour.2017.02.038

Cited by 27 publications

(26 citation statements)

References 30 publications

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“…We have therefore specifically examined the preparation of the amorphous oxide electrode particles suitable for bulk-type all-solid-state batteries. Recently, we have developed the amorphous LiCoO2-Li2SO4 positive electrode active material particles and fabricated bulk-type all-solid-state batteries using these particles [17]. The amorphous Li1.2Co0.8S0.2O2.4 (80LiCoO2•20Li2SO4 (mol%)) showed relatively high mixed conductivity and good formability.…”

Section: Introductionmentioning

confidence: 99%

Amorphous LiCoO2-based Positive Electrode Active Materials with Good Formability for All-Solid-State Rechargeable Batteries

et al. 2018

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Amorphous LiCoO2-based positive electrode materials are synthesized by a mechanical milling technique. As a lithium oxy-acid, Li2SO4, Li3PO4, Li3BO3, Li2CO3, and LiNO3 are selected and milled with LiCoO2. XRD patterns indicate that reaction between LiCoO2 and these lithium oxy-acids proceeds. Amorphization mainly occurs, and several broad peaks attributable to cubic LiCoO2 are observed in all the samples. These amorphous active materials show mixed conductivities of electron and lithium ion. All-solid-state cells using the prepared amorphous active materials and the Li2.9B0.9S0.1O3.1 glass-ceramic electrolyte are fabricated and their charge-discharge properties are examined. The cells with only the 80LiCoO2·20Li2SO4 (mol%) and the 80LiCoO2·20Li3PO4 active materials function as secondary batteries. This is because higher lithium ionic conductivities are obtained in the 80LiCoO2·20Li2SO4 and 80LiCoO2·20Li3PO4 active materials than in the others. The largest capacity is obtained in the cell with the 80LiCoO2·20Li2SO4 active material because of its good formability and high lithium ionic conductivity. In addition, the cell with the 80LiCoO2·20Li2SO4 positive electrode active material shows the better cycle and rate performance than that with the crystalline LiCoO2. It is noted that the amorphization with lithium oxy-acids is a promising technique for achieving a novel active material with better electrochemical performance.

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Section: Introductionmentioning

confidence: 99%

Amorphous LiCoO2-based Positive Electrode Active Materials with Good Formability for All-Solid-State Rechargeable Batteries

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“…Numerous examples of sputtering thin interlayers onto the SE and Li metal, respectively, have been reported. [18][19][20][21] Li-ion conductors such as LiPON, 18 metals like indium 22 or gold 21 as well as metalloids such as silicon 19 have been proven to effectively prevent decomposition reactions between SEs and metallic Li. However, most sputtering techniques are expensive and thus less attractive for largescale applications.…”

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confidence: 99%

Editors' Choice—Understanding Chemical Stability Issues between Different Solid Electrolytes in All-Solid-State Batteries

Riphaus

Stiaszny

Beyer

et al. 2019

J. Electrochem. Soc.

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Sulfide-based solid electrolytes (SE) are quite attractive for application in all-solid-state batteries (ASSB) due to their high ionic conductivities and low grain boundary resistance. However, limited chemical and electrochemical stability demands for protection on both cathode and anode side. One promising concept to prevent unwanted reactions and simultaneously improve interfacial contacting at the anode side consists in applying a thin polymer film as interlayer between Li metal and the SE. In the present study, we investigated the combination of polyethylene oxide (PEO) based polymer films with the sulfide-based SE Li 10 SnP 2 S 12 (LSPS). We analyzed their compatibility using both electrochemical and chemical techniques. A steady increase in the cell resistance during calendar aging indicated decomposition reactions at the interfaces. By means of X-ray photoelectron spectroscopy and further analytical methods, the formation of polysulfides, P-[S] n-P like bridged PS 4 3− units and sulfite, SO 3 2− , was demonstrated. We critically discuss potential reasons and propose a plausible mechanism for the degradation of LSPS with PEO. The main objective of this paper is to highlight the importance of understanding interfaces in ASSBs not only from an electrochemical perspective, but also from a chemical point of view.

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“…It is likely that the degradation during cycling is caused by structural changes due to oxygen elimination or the formation of a resistive interfacial layer between the electrode and electrolyte. 5 A detailed reaction mechanism has not yet been elucidated, and further structural analysis is necessary to understand the redox mechanism. …”

Section: Resultsmentioning

confidence: 99%

Preparation of an Amorphous 80LiCoO2·20Li2SO4 Thin Film Electrode by Pulsed Laser Deposition

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Amorphous LiCoO 2 Li 2 SO 4 active materials: Potential positive electrodes for bulk-type all-oxide solid-state lithium batteries with high energy density

Cited by 27 publications

References 30 publications

Amorphous LiCoO2-based Positive Electrode Active Materials with Good Formability for All-Solid-State Rechargeable Batteries

Amorphous LiCoO2-based Positive Electrode Active Materials with Good Formability for All-Solid-State Rechargeable Batteries

Editors' Choice—Understanding Chemical Stability Issues between Different Solid Electrolytes in All-Solid-State Batteries

Preparation of an Amorphous 80LiCoO<sub>2</sub>·20Li<sub>2</sub>SO<sub>4</sub> Thin Film Electrode by Pulsed Laser Deposition

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