Contradictive-objective-solution (C-OS) matrix research for technology gap analysis of electrolytic copper foil

As the electric vehicle (EV) and energy storage system (ESS) markets expand, electrolytic copper foil has become a key anode current collector influencing battery energy density and safety. However, its development is constrained by complex trade-offs among multiple performance criteria. Conventional patent analysis, such as the OS matrix, often fails to differentiate viable innovation opportunities from technically infeasible gaps. To address this limitation, this study proposes a Contradiction-based Objective-Solution (C-OS) matrix by integrating the Theory of Inventive Problem Solving (TRIZ) into patent landscape analysis. While the conventional OS matrix identified the "Hydroxyl-Thermal Stability" region as a primary white space, the C-OS matrix, incorporating weighted technical contradictions, revealed it as a false white space with prohibitive trade-offs. Instead, the C-OS framework identified the sulfonic acid-based group as a viable white space with high potential for simultaneous improvements in thermal stability and durability. These results show that sulfonic acid groups may effectively reduce pinhole defects and suppress thermal deformation. This study provides a strategic framework for R&D portfolio management, enabling the identification of high-probability innovation pathways and more efficient resource allocation through sustainable technological competitiveness in the next-generation materials development.