Abstract: A non-aqueous electrolyte secondary battery comprises rechargeable positive and negative electrodes and a non-aqueous electrolyte. The positive electrode comprises at least one selected from LiCo0.sub.2, LiMn.sub.2 0.sub.4 and LiNi0.sub.2 and the negative electrode consists most of alkai metals such as lithium, etc. The non-aqueous electrolyte contains lithium salts and has concentration ranging from 0.002 to 1.0 mol/liter of at least one acid anhydride selected from acetic anhydride, benzoic anhydride, succinic anhydride, phtalic anhydride and maleic anhydride.

Abstract: This invention relates to a negative electrode for non-aqueous electrolyte secondary batteries that uses organic electrolyte made form an organic solvent solution of Li salt.More specifically speaking, a highly reliable non-aqueous electrolyte secondary battery is realized by employing a negative electrode of high capacity and excellent cycle characteristics, wherein an active material holder composed of powdered metal, carbon, sulfide, oxide, etc. absorbs Li by charge and desorbes it by discharge or wherein a suitable polymer is used as a binder of the mixture comprising said active material holder and a conductive material. This invention greatly improves capacity and charge and discharge cycle life of not only a coin type cell but also a cylindrical cell, in which a thin and long strip type electrode plate is used and cycle characteristics are more critical.

Abstract: A nonaqueous electrolyte secondary battery is disclosed which has a positive and negative electrode and electrolyte, the positive and negative electrode being reversible for charging and discharging, the electrolyte being a nonaqueous one containing alkaline metal ions, and the negative electrode being made of BC.sub.3 or C.sub.5 N, so that the battery is of high energy density and is highly reliable with reasonable voltage.

Abstract: A spark plug for an automotive internal combustion engine providing improved ignition even when carbon is deposited on the insulator of the plug. A rich fuel-air ratio causes carbon to be deposited on spark plug insulators, thereby decreasing its effective insulation. By limiting the geometrical dimension of the plug's center electrode the problem of carbon build-up is overcome. The sizes of these elements have certain allowable ranges that enhance the igniting effect of the plug.

Abstract: A spark plug for an automotive internal combustion engine providing improved ignition even when carbon is deposited on the insulator of the plug. A rich fuel-air ratio causes carbon to be deposited on spark plug insulators, thereby decreasing its effective insulation. By limiting the geometrical dimension of the plug's center electrode, ground electrode, and insulator the problem of carbon build-up is overcome. The sizes of these elements have certain allowable ranges that enhance the igniting effect of the plug.

Abstract: A spark plug for use in internal combustion engines having a pair of electrodes between which electric spark discharge is effected. The spark plug has a spark discharge portion bonded by, for example, resistance welding to at least one of the electrodes and made of a base metal containing at least 90 wt % of chromium (Cr). A stress-relieving portion having a thermal expansion coefficient intermediate in value between those of the electrode and the spark discharge portion may be formed between the electrode and the spark discharge portion.

Abstract: A spark plug for an automotive internal combustion engine providing improved ignition even when carbon is deposited on the insulator of the plug. A rich fuel-air ratio causes carbon to be deposited on spark plug insulators, thereby decreasing its effective insulation. By limiting the geometrical dimension of the plug's center electrode, ground electrode, and insulator the problem of carbon build-up is overcome. The sizes of these elements have certain allowable ranges that enhance the igniting effect of the plug.