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Release date: Nov. 11, 2020

Chip-Sized Solid-State Battery Opens Door to New IoT Era

The development of solid-state batteries—an alternative to conventional lithium-ion batteries—is currently underway all around the world. These next-generation batteries feature superior safety, high reliability and longer lifespan by using stable, nonflammable and solid electrolyte material instead of liquid, which eliminates the risk of leakage and fire. TDK succeeded in commercializing the world’s first all-ceramic, solid-state SMD*1 battery, CeraCharge®—an emerging choice for implementation in a wide variety of IoT devices.(Photo courtesy of CookPerfect)

The Next-Generation Solution to Limitations of Conventional Lithium-Ion Batteries

It is no exaggeration to say that as we enter the IoT era—where almost everything is connected to the Internet—high battery performance is essential, in addition to compactness and improved communication capabilities, for various smart devices to become even more prevalent. Lithium-ion batteries, which have high energy density, are commonly used today in various electronic devices such as laptops, smartphones and wireless earbuds, and are increasingly utilized in drones, electric bikes and EVs (electric vehicles). However, because lithium-ion batteries made with flammable, organic-solvent electrolytes carry the risk of leakage and fire, there has been an increasing demand from IoT device makers for the development of safer and more reliable solid-state batteries containing stable electrolyte material. The battery market is expected to grow further, as large-capacity batteries like those in EVs are also expected to be replaced by solid-state batteries in the future.

Global Market Size and Forecast of Small All-Solid-State Lithium-Ion, Thin Type Batteries

Global Market Size and Forecast of Small All-Solid-State Lithium-Ion, Thin Type Batteries

Source: Created based on Global Next-Generation Batteries Market: Key Research Findings 2019 by Yano Research Institute Ltd.,

The market for solid-state batteries is projected to grow exponentially over the next 10 years.

Conventional Lithium-Ion Batteries vs. Solid-State Lithium-Ion Batteries

Conventional Lithium-Ion Batteries vs. Solid-State Lithium-Ion Batteries
Solid-state batteries deliver a high level of safety and longer life by utilizing solid electrolyte materials instead of liquid electrolytes like those found in conventional lithium-ion batteries.

Features of CeraCharge, the Solid-State SMD Battery Pioneered by TDK

Cross Section of CeraCharge® Solid-State Battery (Schematic Diagram)

Cross Section of CeraCharge™ Solid-State Battery (Schematic Diagram)
CeraCharge was created by utilizing TDK’s advanced multilayer ceramic technologies.

Adoption in Cooking Thermometers

CeraCharge—the safe, chip-sized solid-state battery, is working its way into a wide range of IoT products. One such application is a cooking thermometer product launched in December 2020. This new product—a 15cm metal thermometer probe from CookPerfect, a Danish company that manufactures a line of cooking thermometers—is equipped with five temperature sensors, a BLE (Bluetooth Low Energy)*2 communication module, and TDK’s CeraCharge. The internal temperature of meat being cooked inside an oven can be monitored in real time from a smartphone by simply inserting this probe. This breakthrough product enables one to cook meats like Christmas roasts at perfect temperatures.

Martin Kloster, Co-Founder and Managing Director of CookPerfect, says: “When we began designing CookPerfect in 2016, battery technology was simply not available that would allow measuring at 5 points, run complex algorithms, and could be built into the unit. But with CeraCharge, we could create the first ‘true wireless’ thermometer.” Kloster says reliability and safety are very important, as these thermometers are inserted directly into food and used in high-heat ovens and grills. “There must never be any chemical leakage. We also needed a high operating temperature range that could withstand usage inside ovens. The fact that CeraCharge has no risk of leakage due to its solid form, is small enough to be installed into a 3.7mm-diameter unit, and can withstand up to 85˚C—were major deciding factors in choosing it for our product.”

CookPerfect’s Wireless Meat Thermometer

CookPerfect’s Wireless Meat Thermometer
Contained within a 15cm metal probe are five temperature sensors, a communication module, and the solid-state CeraCharge battery, enabling real-time temperature monitoring of meat as it cooks. (Photo provided by CookPerfect)

The advent of a full-scale IoT society is on the horizon as devices with various sensors—like this cooking thermometer which combines temperature sensors with communication capabilities—continue to proliferate. Along with the growing need for batteries in various sizes and specifications, CeraCharge is currently being considered for integration into a wide variety of devices, including real-time clocks (RTC)*3 for smart meters, wearables, and smart sensors.

TDK, the first in the world to commercialize solid-state batteries, continues to work on expanding its lineup of products with increased miniaturization and capacities to cover a wider range of applications. CeraCharge will continue to support the rapidly expanding IoT market.

CeraCharge® Solid-State Battery

CeraCharge™ Solid-State Battery
There is a growing need for compact, safe and reliable power supplies in industrial and consumer IoT devices—including everything from simple gadgets to devices with complex specifications. To meet these demands, TDK developed the world’s first rechargeable solid-state SMD battery, CeraCharge. For more information, please visit our Product Center page.


  1. Surface Mount Device (SMD): An electronic component that is mounted on a printed circuit board using solder. This method uses less space than mounting components with leads on a printed circuit board that has holes, enabling the miniaturization of devices.
  2. BLE (Bluetooth Low Energy): A part of the Bluetooth standard, the short-range wireless communication technology. Because of its low power consumption and low cost, it is garnering attention a communication technology for use in IoT devices.
  3. Real Time Clock (RTC): A circuit embedded in a computer or device that continuously measures the passage of time even if the system power is turned off.


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