EU FASTCARD project developed liquefaction & gasification routes to biomass-based fuels; rational nanocatalytic processes
GlobalData: EVs will transform the automotive industry over the next 5 years; potentially 300M EVs by 2040; 15% of registrations by 2030

Japan researchers develop all-solid-state batteries with low resistance at electrode/solid electrolyte interface

A team from Tohoku University and Tokyo Tech have addressed one of the major disadvantages of all-solid-state batteries by developing batteries with a low resistance at their electrode/solid electrolyte interface. The fabricated batteries, reported in the journal ACS Applied Materials & Interfaces, showed excellent electrochemical properties that greatly surpass those of traditional and ubiquitous Li-ion batteries.

The team achieved an extremely low electrolyte/electrode interface resistance of 7.6 Ω cm2 in solid-state Li batteries with Li(Ni0.5Mn1.5)O4. Further, the researchers observed spontaneous migration of Li ions from the solid electrolyte to the positive electrode after the formation of the electrolyte/electrode interface. Finally, they were able to demonstrate stable fast charging and discharging of the solid-state Li batteries at a current density of 14 mA/cm2.


Structure of the thin-film all-solid-state batteries. The batteries were made by stacking various layers via thin-film deposition methods. The LNMO/Li3PO4 interface showed spontaneous migration of Li ions and had an unprecedentedly low resistance.

Solid-state Li batteries (LBs) show great promise as energy-storage devices because of their high energy density and good safety. In particular, solid-state LBs with a 5 V-class positive electrode consisting of Li(Ni0.5Mn1.5)O4 have beeen extensively investigated to further increase their energy density. However, in solid-state Lbs with LNMO, the high interface resistance (charge-transfer resistance, Ri) of ~200-2000Ω cm2 at the LMNO/solid electrolyte interface hinder fast charging and discharging.

The interface resistance of solid-state LNMO LBs is reported to be an order of magnitude higher than that of liquid electrolyte-based batteries using LNMO. Thus, it remains high desirable to lower the interface resistance of solid-state LNMO LBs.


The scientists from Tokyo Tech and Tohoku University, led by Professor Taro Hitosugi, fabricated all-solid-state batteries with extremely low interface resistance using LNMO by stacking various layers via thin-film deposition methods. The team fabricated their batteries under ultrahigh vacuum conditions, ensuring that the electrolyte/electrode interfaces were free of impurities.

After fabrication, the electrochemical properties of these batteries were characterized to shed light on Li-ion distribution around the interface. X-ray diffraction and Raman spectroscopy were used for analyzing the crystal structure of the thin films comprising the batteries.

Spontaneous migration of Li ions was found to occur from the Li3PO4 layer to the LNMO layer, converting half the LNMO to L2NMO at the Li3PO4/LNMO interface. The reverse migration occurs during the initial charging process to regenerate LNMO.

The resistance of this interface, verified using electrochemical impedance spectroscopy, was 7.6 Ωcm2—two orders of magnitude smaller than that of previous LMNO-based all-solid-state batteries and even smaller than that of liquid-electrolyte-based Li-ion batteries using LNMO.


These batteries also displayed fast charging and discharging, managing to charge/discharge half the battery within just one second. Moreover, the cyclability of the battery was also excellent, showing no degradation in performance even after 100 charge/discharge cycles.

The research team hopes that these results will facilitate the development of high-performance all-solid-state batteries, which could revolutionize modern portable electronic devices and electric cars.


  • Hideyuki Kawasoko, Susumu Shiraki, Toru Suzuki, Ryota Shimizu, and Taro Hitosugi (2018) “Extremely Low Resistance of Li3PO4 Electrolyte/Li(Ni0.5Mn1.5)O4 Electrode Interfaces” ACS Applied Materials & Interfaces doi: 10.1021/acsami.8b08506



SS batteries with extremely fast charging/discharging capabilities without major cell degradation are two important characteristics for effective extended range BEVs.

What is the energy density and mass produced price?


"thin-film deposition methods"
Not likely to be low cost manufacturing.

Verify your Comment

Previewing your Comment

This is only a preview. Your comment has not yet been posted.

Your comment could not be posted. Error type:
Your comment has been posted. Post another comment

The letters and numbers you entered did not match the image. Please try again.

As a final step before posting your comment, enter the letters and numbers you see in the image below. This prevents automated programs from posting comments.

Having trouble reading this image? View an alternate.


Post a comment

Your Information

(Name is required. Email address will not be displayed with the comment.)