Secondary battery and anode active substance

Abstract

The invention provides an active material of the anode of a secondary battery, which has good capacity in both low load and high load; the active material of the anode is composed of multiple particles of a metal oxide which forms the body of the active material, a first conductive agent which covers the surfaces of all the particles of the metal oxide, and a second conductive agent which is between the particles of the metal oxide and the specific surface area thereof is less than the first conductive agent.

Description

technical field [0001] The invention relates to a secondary battery and its positive electrode active material. Background technique [0002] Conventionally, various metal oxides have been used as the positive electrode active material of the secondary battery, but in most cases, because the electronic conductivity of the metal oxide itself is low, carbon powder is added to the metal oxide. constituted conductive agent. By adding a conductive agent, electron conductivity is imparted between each metal oxide to promote reduction reaction. [0003] Here, as one of factors affecting battery performance, the mixed state of the metal oxide and the conductive agent becomes a problem. That is, how the metal oxide powder and the carbon material fine powder are brought into contact uniformly at high frequency. If these contact strengths are lowered, a portion where electrons cannot be sufficiently transferred to the positive electrode active material occurs, and as a result, an ac...

AI Technical Summary

Problems solved by technology

However, since there is an interface between the particles of each metal oxide powder, it becomes a resistance under high load, which lowers the utilization efficiency and lowers the capacity.

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