Tokin Corporation

Hiroshi Momotani

Etsuo Otsuki

Tsutomu Otsuka

Akio Hasebe

Tamiko Takeuchi

In a method for charging a secondary battery having a positive electrode, a negative electrode, and an electrolyte, a pulsed current is supplied to the secondary battery to make the pulsed current flow between the positive electrode and the negative electrode through the electrolyte to thereby charge the secondary battery. The pulsed current comprises positive pulse current which has a positive pulse amplitude corresponding to a first current density of 1 .mu.A/cm.sup.2 to 100 mA/cm.sup.2 in the positive electrode. However, the pulsed current may include a negative pulse current following after each positive pulse and having a negative amplitude corresponding to a second current density not greater than a quarter of the first current density.

Method and apparatus for charging a secondary battery by supplying

An organic solvent electrolyte is provided for electrolytically forming a plating film on the surface of a R.sub.2 T.sub.14 B intermetallic compound permanent magnet. The organic solvent electrolyte comprises a metallic salt including at least one metalic element with a supporting electrolyte, the balance being an organic solvent for forming a plating film on the surface of a R.sub.2 T.sub.14 B intermetallic compound permanent magnet, wherein R denotes a rare earth element including Y and T denotes a transition metal including R, Fe and B as main components. The supporting electrolyte includes at least one selected from a group consisting of:

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Miyagi, Japan

Hiroshi Momotani