Organic　polymers　containing　redox-active　moieties　have　attracted　increasing　attention　as　electrode　materials　for　high-performance　rechargeable　batteries　due　to　their　sustainability,　flexibility,　environmentally　benign,　and　high　stability.　Herein,　viologen　functionalized　fluorene-containing　poly(arylene　ether　ketone)s　(MV-FPAEKs)　were　synthesized　by　polycondensation,　bromination,　and　quaternization　in　sequence.　H-1　NMR　was　used　to　monitor　the　degree　of　functionalization　(DF),　which　increased　with　the　increasing　of　the　molar　ratio　of　the　bromination　agent.　The　MV-FPAEK-96　with　a　DF　of　96%　for　viologen　was　used　as　the　active　material　for　polymer　cathode.　The　theoretical　specific　capacity　was　calculated　to　be　87.6　mAh　g(-1)　based　on　the　dual　electron　transfer　per　viologen　unit.　It　had　been　found　that　the　MV-FPAEK-96　battery　delivered　a　discharge　specific　capacity　of　87.1　mAh　g(-1)　at　a　current　rate　of　0.1　C,　and　maintained　32.1　mAh　g(-1)　after　100　galvanostatic　cycles.　In　contrast,　the　small　molecule　of　dimethyl　viologen　was　highly　soluble　in　the　electrolyte,　and　the　corresponding　capacity　decreased　to　negligible　values　after　only　20　cycles.　Therefore,　the　attachment　of　viologen　to　polymeric　backbones　is　an　effective　strategy　to　increase　the　stability　in　electrolyte　while　maintaining　the　rechargeability,　and　the　MVFPAEK-96　is　a　promising　redox-active　candidate　for　polymer　batteries.