Matsushita Establishes Mass-Production System for Safer Lithium-ion Batteries
Dec 18, 2006
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Matsushita Electric Industrial Co., Ltd., best known for its Panasonic brand, announced that one of its subsidiaries, Matsushita Battery Industrial Co., Ltd. (MBI), has established a mass-production system for a lithium-ion battery that incorporates the technology to ensure safety. The company began shipping the industry's first 2.9 Ah high capacity batteries in April this year and is now ready to mass-produce the products.

As equipment including notebook PCs, mobile phones and digital still cameras become more powerful, sophisticated and feature-laden, they require more robust and safer batteries. Increasing energy-density, however, raises the risk of overheating and igniting due to short-circuiting.

MBI has succeeded in improving the safety by forming a heat resistance layer (HRL) consisting of an insulating metal oxide on the surface of the electrodes. Lithium-ion batteries contain a thin polyolefin separator to insulate the cathode from the anode. When a separator is pierced by an electrically conductive material such as a metal particle, a short-circuit develops, causing the battery to overheat and, in the worst case, catch fire. The HRL used in the Panasonic battery, however, has better insulating and heat-resistant characteristics than polyolefin. Even if a short-circuit occurs, it will cease without causing the battery to overheat.

The HRL technology has enabled MBI to increase energy density and mass-produce safer lithium-ion batteries.

MBI has taken measures to prevent lithium-ion batteries from contaminating with electrically conductive materials by eliminating foreign substances from battery materials and creating a clean environment in the battery factory. Considering contamination with such substances, the company has adopted stronger separators and thermally stable materials. Demand for more safety and capacity, however, called for the development of a new technology. The HRL is a product of MBI's research and development of battery technology and its focus on safety as a first priority.

MBI plans to continue developing lithium-ion batteries with even higher levels of capacity and safety to make contributions to the progress towards the "ubiquitous networking society."


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