杨建芬 is listed as an inventor on the patent 'Preparation Method For Sodium-Based Modified Phenolic Resin Hard Carbon Negative Electrode' (WO2025200151), which details a novel approach for producing sodium-based hard carbon anodes using modified phenolic resin. This technology is designed to improve electrochemical performance and cost-effectiveness for sodium-ion batteries, a field of growing interest for energy storage applications in China and globally. As direct public professional information is sparse, Yang Jianfen can be characterized as a scientific researcher or engineer working in battery or materials science, with contributions in innovative carbon electrode preparation—likely affiliated with Chinese research institutes or enterprises active in sodium-ion battery technology.