| 摘 要： | 1 Results In persuit of better safety controls of lithium batteries,much efforts has been focused on the development of the internal and self-actuating overcharge protection additives.We report a novel electropolymerizable electrolyte additive for overcharge protection of lithium batteries. Electrochemical properties and overcharge behavior of NPM as a new polymerizable electrolyte additive for overcharge protection of lithium ion batteries are studied by cyclic voltammetry,charge-discharge measurements,electrochemical impedance spectroscopy and SEM characterization of the electrode of the overcharged batteries1-2].The results show that NPM can electrochemically polymerize at the overcharge potential of 3.8-4.2 V (vs.Li/Li ) to form a thin layer of polymer film on the surface of the cathode,resulting in an internal short-circuit to prevent from the battery voltage runaway.On the other hand,it is also found that the use of NPM as an overcharge protection electrolyte additive does not significantly influence the normal performances of lithium ion batteries.
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