Murata Manufacturing Co Ltd developed a solid-electrolyte lithium-ion (Li-ion) rechargeable battery (all-solid battery) that can be surface-mounted on a substrate for IoT (Internet of Things) devices and wearable devices including earphone-type devices.
Murata made this announcement June 26, 2019. The company has already started to ship samples, planning to start volume production at a rate of 100,000 units per month at its Yasu Office within fiscal 2020.
The battery measures 5 (L) x 10 (W) x 2-6mm (H). Its current capacity is 2-25mAh at a temperature of 25°C. Its rated voltage is 3.8V. Using an oxide-based electrolyte material, it can be surface-mounted by reflow soldering.
Energy density expected to be equivalent to that of Existing Li-ion Batteries
Murata did not disclose the energy density of the all-solid battery this time. However, judging from the size and capacity, it is estimated to be about 150Wh/L.
It is lower than the energy density of existing liquid-electrolyte Li-ion batteries (higher than 200Wh/L). But the maximum energy density of surface-mounted all-solid batteries for which Murata's rivals have already started to ship samples is about 26Wh/L, and the energy density of the new battery is much higher than that.
Moreover, Murata expects that the new technology will realize an energy density of 140-700Wh/L, which is close to the maximum energy density of liquid-electrolyte Li-ion batteries.