Negative Electrode Sheet With Elastic Additive for Volume Expansion

The patent applies a flexible binder system that can accommodate volume changes of high capacity negative electrode materials during cycling. The binder forms a flexible matrix that allows the electrode structure to expand and contract without breaking physical contact between particles, thus resolving the contradiction between using high capacity materials and controlling volume expansion.

The patent uses composite material structures where high capacity negative electrode materials (silicon or lithium metal) are combined with graphite and other materials having different expansion characteristics. This composite approach allows the high capacity materials to provide increased storage capacity while the composite structure as a whole maintains more stable volume through the complementary properties of different materials.

The patent employs a specially designed binder system that acts as a cushion between active particles during volume changes. This binder maintains flexible physical contact between particles throughout the expansion and contraction cycles, ensuring that electrical connectivity is preserved even when significant volume changes occur during charging and discharging.

The patent creates a dynamic electrode structure where the binder and electrode matrix can adapt their configuration during cycling. The flexible binder allows the electrode to dynamically adjust its structure during expansion and contraction, maintaining particle contact through controlled deformation rather than rigid fixed positions.

The patent uses a protective binder system that cushions the high capacity negative electrode materials against mechanical stress during cycling. This beforehand cushioning prevents particle fragmentation and maintains electrode integrity over many cycles, thus improving cycling performance while retaining the high storage capacity benefits.

The patent employs composite material structures combining high capacity materials with more stable materials like graphite. This composite approach creates a synergistic effect where the stable matrix protects the high capacity materials during cycling, enabling both high storage capacity and sustained cycling performance.

The patent employs a flexible binder matrix that acts as a protective shell around active particles, accommodating volume expansion during charging without compromising the structural integrity. This flexible matrix maintains ductility and fatigue resistance by allowing controlled deformation while preventing crack propagation in the electrode.

The patent uses composite material structures where high capacity materials are embedded in a matrix of materials with good mechanical properties. This composite structure distributes mechanical stress during volume expansion, protecting the brittle high capacity materials while maintaining overall electrode strength and fatigue resistance.