Industrial Technology Research Institute

Cheng-Hung Cheng

Jin-Ming Chen

Weir-Mirn Hurng

Yi-Hua Liu

Chia-Yu Yang

Tung-Han Kao

Sheng-Hua Shih

Ching-Yih Yao

The present disclosure provides a method for charging a battery. The method receives a plurality of battery parameters during the period of the battery charging, and the plurality of battery parameters are turned into fuzzification and corresponded to fuzzy rules to map out a fuzzy output. Then the fuzzy output is turned into defuzzification to obtain the value of the charging current. Therefore, the present disclosure can change the charging current adaptively to enhance the charging effect.

Battery charging method to obtain a charging current using fuzzification and defuzzification

An organic electrolyte for use in a lithium secondary battery comprising a lithium salt dissolved in an organic solvent mixture is disclosed. The lithium salt can be LiClO.sub.4, LiPF.sub.6, LiBF.sub.4, LiCF.sub.3 SO.sub.3, LiAsF.sub.6, or other lithium salt, and the organic solvent mixture contains a carbonate and an acetate. The carbonate is ethylene carbonate, and the acetate can be either methyl acetate or ethyl acetate. The carbonate and the acetate are provided in a ratio of carbonate/acetate ranging from 80/20 to 20/80, or preferably from 40/60 to 60/40, and said lithium salt has a concentration of between 0.6 and 1.5M, or preferably at about 1M. The electrolyte exhibits excellent stability in a lithium secondary battery having a cathode which contains either LiCoO.sub.2 or LiMn.sub.2 O.sub.4, and can withstand charge/discharge voltages of at least as high as 5 V (vs. Li/Li.sup.+), with excellent service life.

Stable high-voltage electrolyte for lithium secondary battery

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Chutung, Taiwan

Cheng-Hung Cheng