MANUFACTURE OF NONAQUEOUS ELECTROLYTE SECONDARY BATTERY AND NEGATIVE ELECTRODE ACTIVE MATERIAL THEREOF

摘要

PURPOSE:To improve formation efficiency and activator utilization efficiency of negative electrode active material by using composite oxide of lithium and boron shown by a specific composition formula or boron oxide. CONSTITUTION:A counter electrode case 1 serves also as a counter electrode terminal and is made by drawing stainless steel plate nickel-plated on the outer face one side. A counter electrode collector 2 is made of stainless steel net and is spot-welded to the case 1. A counter electrode 3, which is made by punching aluminum plate of a predetermined thickness in a predetermined diameter, is fixed to the collector 2 and lithium foil of a predetermined thickness punched in a predetermined diameter is brought in pressure contact thereon. A working electrode 7 also serves as a working electrode terminal and a working electrode 5 comprises a specific active material. A composite oxide of lithium and boron shown by a composition formula LixByO3 or boron oxide is used as negative electrode active material. When conditions x>=0 and y>0 are applicate, charge and discharge capacity becomes large and polarization becomes small for improving formation efficiency and activator utilization efficiency.