Currently the use of LiCoO{sub}2 is generally common as the cathode material of a lithium ion battery. Although LiNiO{sub}2 is recently gathering attention because of a higher capacity and a lower productive cost, its practical use is delaying due to the doubt on its safety. Recently we built and tested a lithium ion polymer battery using LiNi{sub}0.8Co{sub}0.15Al{sub}0.05O{sub}2 as the positive active material to qualify its safety and character. The performance of the battery was the same as that with LiCoO{sub}2 except for the capacity. In our safety test, neither venting nor fire was observed.
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