Positive electrode of nonaqueous electrolyte battery and nonaqueous electrolyte secondary battery

Abstract

[Problem] To provide a positive electrode of a non-aqueous electrolyte battery which avoids internal short circuit and has a large charge and discharge capacity, and a battery using the positive electrode. [Solution] A positive electrode of a non-aqueous electrolyte battery, comprising: a positive current collector; a coating film of a positive active material formed on the current collector; an uneven region formed along an end of the coating film, wherein The thickness variation of the positive electrode active material; and the protruding insulators erected on the non-uniform region and a part of the surface of the current collector adjacent to the non-uniform region, the protruding insulators erected on the surface of the non-uniform region are independent from each other and in a sufficiently low configuration The density is arranged to allow movement of battery reactant species across the surface of the non-uniform region. The protruding insulators standing on a part of the surface of the current collector are arranged at an arrangement density higher than that of the protruding insulators standing on the surface of the uneven region. There is also provided a non-aqueous electrolyte secondary battery using the above positive electrode.

Description

technical field [0001] The present invention relates to, for example, a positive electrode of a nonaqueous electrolyte battery such as a lithium ion secondary battery, and a nonaqueous electrolyte secondary battery using the positive electrode. Background technique [0002] In a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery, a positive electrode and a negative electrode are laminated with a separator interposed therebetween. Therefore, in order to prevent a short circuit due to contact between positive and negative electrodes at the end of one electrode, an insulating layer is formed at the end of this electrode. However, the insulating layer formed to prevent short circuits reduces the number of material movement paths between positive and negative electrodes during charge and discharge, resulting in a decrease in charge and discharge capacity. [0003] Under such circumstances, some proposals have been made to achieve prevention of shor...

AI Technical Summary

Problems solved by technology

However, the insulating layer formed to prevent short circuits reduces the number of material movement paths between the positive and negative electrodes during charge and discharge, resulting in a decrease in charge and discharge capacity

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