Solid-state battery – a hybrid of battery and capacitor

November 22, 2017 // By Christoph Hammerschmidt
With CeraCharge, TDK has developed the world's first solid-state battery in SMD technology. In contrast to most common battery technologies, CeraCharge works without any liquid electrolytes.

Similar to ceramic capacitors, the CeraCharge is based on multilayer technology and combines a high energy density in the smallest possible space with process reliability in the manufacture of multilayer components. The use of a ceramic solid as electrolyte also excludes the risk of fire, explosion or leakage of electrolyte fluid.

To increase capacity and voltage, individual CeraCharge chips can be connected in series and in parallel, which opens up a very wide range of possible applications.


Sectional view through the CeraCharge. Instead of a liquid
electrolyte, a ceramic solid state electrolyte is used.

With this new technology, the manufacturer is primarily addressing IoT applications that are tailored to the low power requirements of new ultra-low power semiconductors and sensors and that operate independently of external power supplies for years using energy harvesting technologies. These include real-time clocks, Bluetooth beacons, wearables and energy harvesting. The requirements for electrical storage media are: small size, rechargeability, intrinsic safety, easy assembly, low costs and long service life. With current technologies, these requirements cannot be met at the same time. For many applications, the TDK CeraCharge now offers a way out of this dilemma.

In the compact size EIA 1812, the battery, which can be rechargeable several dozen to 1000 times, offers a capacity of 100 µAh at a nominal voltage of 1.4 V depending on the requirements. In the short term, currents in the range of a few mA can also be drawn.

More information: https://en.tdk.eu/tdk-en


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