Solidifying electrolyte and separator as well as positive/negative electrode material enables solid-state batteries to have the following features;
- Superior performance at a wide range of temperatures
- Long life
- High capacity, high output
- High safety

Maxell started shipping samples of coin type all-solid-state batteries taking above advantages in September 2019 and is now preparing for production.

Potentials of Maxell's all-solid-state battery

Maxell's all-solid-state battery applies its original sulfide based solid electrolyte and electrode materials. Using these materials has resulted in inhibiting an increase of resistance and improvement of discharged capacity during heavy load, compared to conventional batteries with liquid electrolytes.

Sulfide based solid electrolyteMaxell's all-solid-state battery
Thermal stability Stable at temperature range from 120 deg.C to 200 deg.C Heat resistance Superior performance at wide range of temperatures from -50 deg.C to 125 deg.C
Chemical stability Stable and highly ion-conductive interface layer between positive/negative electrodes and sulfide based solid electrolyte Long life Performance stability for minimum 20 years
Oxidation-reduction stability Highly stable at a range of voltages from 0V to 5V High capacity Stable behavior as high performance material even if it is not stable in liquid electrolyte.
Formability Soft and easy to mold at room temperature High capacity Simple process to manufacture thicker electrodes
Ion conductivity Equivalent to liquid-type electrolyte(no diffusion occurs as opposed to liquid electrolyte) High output Several times higher output than liquid electrolyte due to having no resistance components
Flame resistance Non-hazardous material due to its low flammability(typical equid electrolyte is classified as hazardous material) High safety +5 deg.C or less heat generation after various kinds of safety tests

Lifetime characteristics - high temperature storage test and cycle test

Usable in severe circumstances for a long period of time by success in drastic improvement of storage and lifetime characteristics within a high temperature environment, in comparison to conventional batteries with liquid electrolyte.

Storage test after charged 100% at 60 deg.C
Cycle performance at 100 deg.C

Reliability - Overcharge test

No degradation under over-discharge condition such as 0V. This battery can be stored for long term.(PMIC function can be simplified.)

Storage performance after discharged to 0V


High safety under severe conditions

safety test


Maxell has succeeded in development of all-solid-state battery with heat-resistant temperature of 100 deg.C or higher and performance stability for minimum 20 years.

Nominal Voltage (V) 2.3
Nominal Capacity (mAh) 8.0
Battery life >20 years
DimensionsDiameter (mm) 9.5
Height (mm) 2.65
Charge (CCCV)Max. Voltage (V) 2.6
Standard Current (mA) 4.0
Temperature (deg. C) -20~105℃
Discharge (CC)End Voltage (V) 0.0
Max. Current (mA)*1 30.0
Temperature (deg. C) -50~125 deg. C

*1 maximum current to maintain battery's voltage not less than 1.8V after discharge for 1 sec

Discharge characteristics

discharge characteristics

Q1. What is differentiation point of Maxell's all-solid-state battery?

A1. Maxell's all-solid-state batteries can be differentiated by the fact that they are developed, designed and manufactured using Maxell's unique analog core technologies of "mixing / dispersion" and "precision coating"



Q2. What are the greatest features of Maxell's all-solid-state battery?

A2. The features of Maxell's all-solid-state batteries are that they use argyrodite-type sulfide based solid electrolyte to achieve long life, high heat resistance, high capacity, and high output.



Q3. What kind of technologies are utilized in developing all-solid-state battery?

A3. The Maxell's coin type all-solid-state battery has been realized by combining our proprietary material technologies with process technologies such as mixing, molding, and sealing. The material and process technology have been cultivated mainly by the lithium-ion battery and the micro battery business respectively. In addition, "Monozukuri-ryoku", the manufacturing capabilities cultivated in the manufacture of lithium-based batteries, is also being utilized.



Q4. What are the advantages of Maxell's all-solid-state battery?

A4. The advantage of Maxell's all-solid-state batteries is the use of sulfide based electrolytes. Since the electrolyte does not require the sintering process that is indispensable for oxide based solid electrolytes, the choice of materials is expanded and battery characteristics can be dramatically improved.
The sulfide based solid electrolyte of Mitsui Kinzoku used by Maxell is very soft, so it can be solidified to manufacture electrodes at room temperature. This makes it more advantageous to demonstrate Maxell's analog core technologies such as mixing and dispersion.



Q5. What kind of applications are suitable for Maxell's all-solid-state battery?

A5. It is suitable for use in wearable devices that require high output as well as high safety and reliability for communication. And also it is suitable for IoT, in-vehicle, FA devices etc. that are used in harsh environments and used for long period of time.



Q6. When is the mass production scheduled for?

A6. In 2021.



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