News Release
August 21, 2024
Nippon Electric Glass Co., Ltd.

Started Shipping Samples of Heat-Resistant All-Solid-State
Sodium-Ion Secondary Batteries
The World’s Widest Operating Temperature Range,
Targeting Space and Semiconductor Applications

Heat-resistant all-solid-state sodium-ion secondary battery

Nippon Electric Glass Co., Ltd. (Headquarters: Otsu, Shiga, Japan; President: Akira Kishimoto;hereinafter referred to as “NEG”) has started sample shipments of heat-resistant all-solid-statesodium-ion secondary batteries (hereinafter referred to as “NIBs”) that are operable over thetemperature range of -40°C to +200°C, the world’s widest operating temperature range ofsecondary batteries.
NEG’s NIBs are attracting attention for their wide operating temperature range and safety features,such as the absence of ignition and gas generation risks, in various fields, including space
applications, semiconductor manufacturing processes, and medical and environmental equipment.
This sample shipment is NEG’s important step to meet these needs swiftly and promote thedevelopment of application areas that conventional secondary batteries have not been able toaccommodate.
Existing secondary batteries face challenges such as electrolyte freezing at low temperatures andthe deterioration of internal materials due to side reactions at high temperatures. Notably, thishigh-temperature issue also occurs in conventional all-solid-state batteries, which do not use liquidelectrolytes. Therefore, even with sulfide-based all-solid-state batteries, which are being widely
studied, it is not easy to expand the upper operating temperature limit.
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In contrast, NEG’s NIBs have the positive electrode, negative electrode, and solid electrolyte thatare all made of crystallized glass, making them highly resistant to freezing at low temperaturesand deterioration at high temperatures. In addition, they do not pose any risk of ignition or gas
generation. Furthermore, to maximize these features, NEG has developed a heat-resistantpackage utilizing glass sealing technology. Glass sealing is one of the most reliable technologies,
with a proven track record in various fields, such as automotive, home appliances, andcommunications. This is the first time the technology has been applied to battery packaging.
NIBs using the heat-resistant package can operate in high-temperature environments up to 200°C
and can be designed to meet the needs of even temperature ranges exceeding 200°C. In addition,a high temperature environment promotes the movement of ions within the battery, enabling ultrafast charging and discharging that is not possible at room temperature. NEG’s NIBs can achieve
high-speed charging and discharging at a 20C rate*1 in a 200°C environment. Moreover, thepackage using glass sealing technology maintains high airtightness even at high temperatures,
preventing moisture from entering the battery and thereby providing excellent charge-discharge
cycle characteristics.
*1 C rate: A unit of measure for the current during charging or discharging. 1C is defined as the current thatfully charges (or discharges) the battery in one hour, and 20C represents a current 20 times that amount(i.e., a current that enables charging or discharging to be completed in three minutes).

NEG is actively pursuing the commercialization of all-solid-state sodium-ion secondary batteries
and aims to expand their application range through this sample shipment.
■ Features of the heat-resistant NIB operable at 200°C
 Package structure:
Glass sealing technology provides high airtightness.

 Results of charge-discharge cycle test at 200°C
It has excellent charge-discharge cycle characteristics even in a high-temperature environmentof 200°C.

200°C
Voltage range: 1.5 to 4.5 V
Charging conditions: 1C-CCCV
Discharging conditions: 1C2

 Results of high-speed charge-discharge test at 200℃
Capable of high-speed charge and discharge at 20Cin a high-temperature environment of 200°C
Discharge rate test

Voltage (V)Voltage (V)Charge rate test

Charge capacity (mAh)

Discharge capacity (mAh)

Charge rate test:

Charge curves obtained from performing 4.5V-CCCV charging at different rates
from a discharged state
Discharge rate test: Discharge curves obtained from performing 1.5V-CC discharging at different
rates from a charged state■ Overview of heat-resistant NIBs
Battery 1(SNB011515T)

Battery 2(SNB015050T)

Length (mm)1660

Width (mm)1550

Thickness (mm)11Weight (g)0.75Nominal voltage (V)

2.9

2.9

Nominal capacity (mAh)0.44Upper voltage limit (V)

4.5

4.5

Temperature range (℃)

0 to +200*2

0 to +200*2

1.5*3

1.5*3

-40 to +200*2-40 to +200*2

Size

Charge (CCCV)

Discharge (CC)Discharge cutoff
voltage (V)Temperature range (℃)*2: Can also operate at temperatures above 200°C. Short-term use at 300°C is possible.
*3: Since the battery uses materials resistant to over-discharge, it does not deteriorate even if it is discharged
to 0 V.

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■ Features of NEG’s NIBs
3 V and long life

NEG’s NIBs operate at a practical voltage level of 3 V.
The long-life batteries have been realized by firmly integrating
the solid electrolyte with the electrodes using NEG’s uniquetechnology.

Operating temperature
range-40℃ to 200℃

NEG’s NIBs enable the operation of industrial equipment andthe transfer of large volumes of data even in harshenvironments such as low temperatures, high temperatures,and vacuum conditions. *The heat-resistant package allows
operation even at high temperatures exceeding 100°C (up to200°C).

No risk of ignition or toxic
gas generation

NEG’s NIBs use solid oxides with excellent safety characteristics.
Since no liquid electrolyte is used, there is no risk of ignition.
Also, there is no risk of toxic gas generation due to the absenceof sulfides, chlorides, and fluorides.

Rare element-free

No rare metals, such as lithium, nickel or cobalt, are used.

High flexibility in battery
designThe design flexibility is high due to the ease of integration, as
well as high adaptability to large-area or high-capacity
applications.

Chargeable with a low
current

Charging at a low speed (low rate) is possible. Maintenancefree power generation and storage systems can be achievedby combining the NIBs with energy harvesting technology(which converts very small amounts of energy into electricityfor use).

High over-discharge
resistance

Since NEG’s NIBs use materials resistant to over-discharge,
they do not deteriorate even if they are discharged to 0 V.

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■ Expected applications of NEG’s NIBs
 Use in harsh conditions, such as space(vacuum × low temperature), marine (highpressure × low temperature), and medical(high temperature) environments

 Energy harvesting systems that use light,heat (temperature differences), andvibration as energy sources Batteries for electronic equipment, mobility
applications, and stationary use that require highlevels of safety and battery design flexibility

 Integration into electronic circuit boards. NEG’sNIBs are not affected by reflow soldering at
300°C, making it possible to maintain stablecharging and discharging characteristics.

Light, heat, vibration, etc.

Power generation devices

Energy storage devices(Nippon Electric Glass NIBs)

 Wireless technology for devices used at
extremely high temperatures over 100°C

 Application to environments/devices where thegeneration of corrosive gases could be a criticalissue* All photos are for illustrative purposes only.

5◼ About Nippon Electric Glass

Nippon Electric Glass Co., Ltd. is a world-class specialty glass manufacturer headquartered in Otsu
City, Shiga Prefecture, Japan. Specialty glass that creates novel functionality is transformed into
products in various forms, such as sheets, tubes, threads, and powders, and is utilized across a wide
range of fields, including semiconductors, displays, automobiles, electronic devices, medical care,and energy. The specialty glass developed based on the technology and track record honed over thecompany’s 70-year history is highly regarded in a broad spectrum of areas, from everyday
applications to cutting-edge industrial uses.
Company name: Nippon Electric Glass Co., Ltd.
Head office: 7-1 Seiran 2-chome, Otsu, Shiga 520-8639, Japan
Representative: Akira Kishimoto, President and Representative Director
Founded: December 1949
URL: https://www.neg.co.jp/en/Contact Form
Link: Inquiry about Company | Nippon Electric Glass Co.,Ltd. (neg.co.jp)

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