Panasonic Corporation has developed an 18650-type high-capacity 3.1 Ah lithium-ion battery and began mass production of the battery this December. The new 3.1 Ah cell has a nickel cathode and an energy density of 675 Wh/L.
The company successfully achieved safety and higher capacity by using its Heat Resistance Layer (HRL) technology that forms an insulating metal oxide layer between the positive and negative electrodes. The layer prevents the battery from overheating even if a short circuit occurs.
Capitalizing on this technology, Panasonic commercialized a high-capacity 2.9 Ah lithium-ion battery with a nickel positive electrode (energy density: 620 Wh/L) in 2006. (Earlier post.)
Based on the cell construction with the nickel positive electrode and the HRL, the company added improvements to the battery and succeeded in developing the 3.1 Ah lithium-ion battery, currently the industry’s highest capacity in the 18650-type.
The new battery provides long-lasting power to laptops. This high energy density battery can also contribute to downsizing and weight reduction of portable devices. With adoption of the nickel positive electrode, the new rechargeable battery excels in durability in actual use and charge retention—the battery can be stored for a long period of time because of low self-discharge.
Panasonic will continue to refine its battery technology to deliver lithium-ion batteries combining safety with high capacity and use this technology to develop commercially viable green energy storage systems.
(new high-capacity model)
|Capacity||2.9 Ah||3.1 Ah|
|Volumetric energy density||620 Wh/L||675 Wh/L|
|Mass||approx. 44 g||approx. 44.5 g|
|Voltage||3.6 V||3.6 V|
|Charging voltage||4.2 V||4.2 V|
|Capacity||10.4 Wh||11.2 Wh|