Positive Electrode Aggregate Layer to Limit Cathode Cracking

The patent applies beforehand cushioning by incorporating a particulate aggregate composed of inorganic particles, conductive agent, and binder into the positive electrode mixture layer before battery assembly. This aggregate acts as a buffer that anticipates and absorbs the volume expansion and contraction of the positive electrode active material during charge-and-discharge cycles, preventing particle cracking and improving cycle characteristics while maintaining binding force.

The patent applies composite materials by creating a particulate aggregate that combines inorganic particles (such as aluminum oxide, silicon oxide, or titanium oxide), conductive agent (such as acetylene black or graphite), and binder (such as polyvinylidene fluoride or carboxymethyl cellulose). This composite structure provides mechanical support, electrical conductivity, and binding functionality simultaneously, allowing the positive electrode to maintain structural integrity during charge-and-discharge cycles while retaining battery capacity.