Kyocera Develops World's 1st 'Clay-type' Li-ion Battery

2019/10/04 21:02
Sousuke Kudou, technical writer
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Kyocera Corp announced Oct 2, 2019, that it has developed a clay-type lithium-ion (Li-ion) storage battery using clay-like positive and negative electrodes and will commercialize the "Enerezza" stationary residential storage battery system using the battery.

This will be the first time in the world that a clay-type Li-ion storage battery has been commercialized, according to Kyocera.

Kyocera expects that the Enerezza will be (1) combined with "post-FIT" residential solar power generation (PV) systems, for which the FIT-based purchasing period was ended, for self-consumption and (2) used as a stand-alone power source at the time of disaster.

In or after January 2020, Kyocera will start to sell a limited number of the Enerezza and begin volume production in earnest in or after the fall of 2020. It plans to produce 20,000 units of the battery system per year. There will be no manufacturer's suggested retail price for the product.

The Enerezza stationary residential storage battery system. From left, they are the PV inverter, storage battery unit and remote control. (source: Kyocera)

The thicknesses of the positive and negative electrodes of the clay-type Li-ion storage battery can be 300-400μm, which is three to five times more than the thickness of conventional liquid-type Li-ion storage batteries (50-120μm). So, Kyocera drastically simplified the production process of the new battery.

Also, by employing a structure that combines unit cells sealed with a pouch material in series and parallel to make a module, a long product life and high safety were realized. The production cost of the new battery is about 30% lower than that of conventional Li-ion storage batteries.

The Enerezza will come in three models: "EGS-LM0500" with a rated capacity of 5.0kWh (effective capacity: 4.2kWh), "EGS-LM1000" with a rated capacity of 10.0kWh (effective capacity: 8.5kWh) and "EGS-LM1500" with a rated capacity of 15.0kWh (effective capacity: 12.7kWh).

Kyocera will offer an LTE communication line and communication modem as standard features and provide a service of connecting to a dedicated server and checking the operation state of the battery system (without depending on the internet environment of the user). Also, its software can be remotely updated.

Kyocera employed smooth, seamless curved surfaces for the cases of the system. The storage battery unit, PV inverter and remote control of the system share the same design concept that fits in with living space. For the display of the remote control, the company put emphasis on usability and made it easy to view information including remaining battery level and the amount of electricity generated with a PV system.