2019 Fiscal Year Annual Research Report
Design of electrode-electrolyte interface based on hybrid materials for all-solid-state lithium batteries using oxide solid electrolytes
| Project/Area Number |
17K17559
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| Research Institution | Hokkaido University |
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Principal Investigator |
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| Project Period (FY) |
2017-04-01 – 2020-03-31
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| Keywords | Hybrid Material / garnet solid electrolyte / interfacial resistance |
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| Outline of Annual Research Achievements |
1.New hybrid organic-inorganic solid electrolyte membranes based on polyethylene oxide chains and lithium salts were prepared. The variation of the precursor and the control of the poly-condensation reactions improve the cross-linking structure and further, the ionic conductivity. Hybrid membranes using 3-glycidoxypropyl-trimethoxysilane (GPTMS), trimethylolpropane triglycidyl ether (TPTE) and methyltriethoxysilane (MTES) doped with lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) achieve 1.6 x 10-5 S/cm with a transference number of 0.44.
2.All-solid-state batteries based on garnet-type solid electrolyte (LLZ) and hybrid material as interfacial material were prepared. Active materials such as TiS2, LiFePO4, and LiCoO2 with different voltage windows were evaluated.
3.Different methods for the preparation and deposition of the electrode composite (slurries) containing active materials and hybrid material on the surface of the solid electrolyte were studied. The effect of the particle size of the active material and the content of the hybrid material were evaluated to optimize the battery properties. The preparation of electrode composite by the Doctor-blade method on aluminum foil reduces the side reactions with the solid electrolyte. All-solid-state battery (LiCoO2/LLZ/Li) using hybrid material at the electrode positive interface reach 120 mAh g-1 at room temperature.
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