SOLID SOLUTION OF TRANSITION METAL OXIDE CONTAINING LITHIUM AND NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY USING THE SOLID SOLUTION OF TRANSITION METAL OXIDE CONTAINING LITHIUM IN POSITIVE ELECTRODE

摘要

The present invention relates to a non-aqueous electrolyte secondary battery using a solid solution lithium-containing transition metal oxide and a solid solution lithium-containing transition metal oxide as a positive electrode. There is a problem that a high initial discharge capacity and a high capacity retention rate can not be realized in the nonaqueous electrolyte secondary battery using the solid solution lithium transition metal oxide of the prior art. The present invention relates to a solid-state lithium-containing transition metal oxide represented by a specific composition formula, which has a layered structure portion and a portion which changes into a spinel structure by charging or charging / discharging in a predetermined potential range (a layered structure of Li ₂ MnO ₃ And the spinel structure change ratio k is in the range of 0.25? K 1.0 when the ratio of the spinel structure change to the spinel structure LiMn ₂ O ₄ is 1, Thereby realizing a high initial discharge capacity and a high capacity retention rate.