Lithium secondary battery and positive electrode for the battery

摘要

The lithium secondary battery positive electrode provided by the present invention has a positive electrode collector and a positive active material layer formed on the collector. The positive active material layer is composed of a matrix phase containing at least one particulate positive active material and at least one binder, and an aggregate phase dispersed in the matrix phase, constituted by aggregation of at least one particulate positive active material and containing substantially no binder.

主权项

1. A positive electrode for a lithium secondary battery, comprising a positive electrode collector and a positive active material layer formed on this collector, wherein the positive active material layer is composed of:
a matrix phase comprising positive active material fine particles having an average particle diameter of 1 μm or less and at least one binder; and a plurality of aggregates being distinct from the matrix phase, and each of the plurality of aggregates being composed of positive active material particles having an average particle diameter of 5 μm to 50 μm and containing substantially no binder, wherein the plurality of aggregates are present in a state of being dispersed independently from one another in the positive active material layer, and wherein each of the plurality of aggregates is enveloped by the matrix phase.