Together with ring-opening metathesis polymerization, a controlled protocol of a progressive addition of the ultrafast-initiating and more reactive third-generation Grubbs catalyst yields a dendronized polymer (denpol) containing multi-anthraquinone-terminated dendrons (AQ-ter-denpol) (M-n=14.0kDa) with a unimodal molar mass distribution (polydispersity index=1.20), fully characterized by (1)Hnuclear magnetic resonance spectroscopy. AQ-ter-denpol is investigated as an organic cathode material for rechargeable Li-ion batteries, with a view to its unique morphology. Our methodologies establish an opportunity for developing a new generation of organic electrodes based on denpols.