Solid-State Lithium Ion Battery Has High Thermal Durability

First Posted: Dec 15, 2015 04:00 PM EST

Scientists have developed a new simple technology that can reduce the internal resistance of the all-solid-state lithium ion battery (Li-ion battery) through the use of a complex hydride as a solid electrolyte, according to a study done at Tohoku University.

The charge-discharge performance of the Li-ion battery can be improved significantly by reducing the internal resistance, which enables the battery to function successfully at high temperatures as 150 degrees Celsius and a discharge capacity of 90 percent of theoretical value.

The researchers' new development could enable thermally durable Li-ion batteries to have a wide range of applications in large-scale industrial machines with motors and medical machines that require heating for autoclave sterilization. The new technology does not rely on a cooling system, which is a common feature in traditional Li-ion batteries, according to the researchers.

The researchers' technology paves the way for new developments of compact battery systems and it can reduce the cost and production. The high energy density Li-ion battery has been used as a power source for portable devices, such as smartphones and tablets and with electric vehicles.

The conventional Li-ion battery has organic electrolyte solution in which lithium ion conducts between the two electrode layers during the charge and discharge process. The conventional Li-ion battery has poor thermal durability and its upper operating temperature is limited to about 60 degrees Celsius. Therefore, it is difficult to use this battery in a high temperature environment without a cooling system.

The researchers' new technique offers a solid electrolyte with no volatility, which is ideal for a Li-ion battery to function in a high temperature environment. However, lithium ion conductivity of solid electrolyte is lower than the organic electrolyte solution. Thus, the internal resistance of a solid-state Li-ion battery would need to be reduced for its commercialization.

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