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Hitachi Maxell announced on December 10, 2015 that it has developed a new technology that can realize a high current capacity lithium ion secondary battery. According to reports, through the use of newly developed silicon materials in the negative electrode of a battery, the energy density can be approximately twice that of the company's previous products. The company plans to exhibit lithium-ion secondary batteries using the new technology at the "Wearable Expo at the 2nd Wearable Devices" held at Tokyo Ariake International Convention and Exhibition Center on January 13-15, 2016.
Hitachi Maxell named the new technology "ULSiON". The negative electrode active material of the battery is a composite material "SiO-C" coated with a carbon coating on the SiO surface. It is widely believed in the industry that the use of silicon as a fine particle can reduce the expansion and contraction of the negative electrode material to a certain level when using silicon. Hitachi Maxell used new materials, "in a small lithium-ion battery with a width of 13mm or less, it achieved about twice the energy density of previous products."
Hitachi Maxell said, "This is an electrode technology that can be charged in a wide range of high voltage to low voltage," assuming a low voltage of about 2.0V at the end of the battery discharge. In the lithium ion secondary battery using a silicon material as a negative electrode, the discharge curve is very smooth down to a low voltage, a lower discharge end voltage can be set, more capacity can be output, and excellent performance can be exerted. Hitachi Maxell has previously introduced lithium-ion secondary batteries that use silicon materials for negative electrodes and are used in smart phones and other products. The company said that this technology is based on the experience of these smart phone batteries, and further improve the high-capacity technology.
A lithium ion secondary battery using ULSiON technology is conceived as a laminated battery of a small terminal such as a wearable device. Small terminals have limitations in battery size, and it is therefore expected that such terminals have a great demand for high energy density batteries. (Reporter: Pengtian Hongshu)
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