We　report　a　potassium　doped　NaV6O15　anode　with　enhanced　electrochemical　performance,　used　for　aqueous　rechargeable　lithium　ion　battery.　Different　Na1-xKxV6O15　(x　=　0,　0.1,　0.2,　0.3)　compounds　are　prepared　and　characterized　using　X-ray　diffraction　patterns　ensuring　potassium　doping.　The　electrochemical　performances　of　the　various　potassium　doped　anodes　NaV6O15,　Na0.9K0.1V6O15,　Na0.8K0.2V6O15,　and　Na0.7K0.3V6O15　are　evaluated　by　cyclic　voltammetry　and　galvanostactic　charge/discharge　methods.　The　results　suggest　that　potassium-doping　has　a　positive　effect　on　the　electrochemical　performance　of　aqueous　rechargeable　lithium　ion　batteries.　The　anode　Na0.8K0.2V6O15　is　found　to　be　optimized　potassium　doped　anode　materials　for　aqueous　rechargeable　lithium　ion　battery.　The　Na0.8K0.2V6O15　anode　displays　enhanced　cycling　and　rate　performances,　an　initial　specific　capacity　of　218　mAhg(-1),　and　133　mAhg(-1)　is　delivered　after　50　cycles　(61%　capacity　retention)　at　the　current　density　of　100　mAg(-1).　The　potassium　doping　has　induced　enhanced　interlayer　spacing　in　the　layered　structure　of　NaV6O15　due　to　potassium　ions　having　larger　ionic　radii　than　sodium.　This　enhanced　interlayer　spacing　provides　wider　channels　for　lithium-ion　intercalation/extraction,　which　in　turn　increases　the　lithium-ion　diffusion　coefficient.　The　lithium-ion　diffusion　coefficients　for　NKVO-2　at　0.09,　-0.26,　and　-0.68　V　vs　saturated　calomel　electrode　(SCE)　were　calculated　as　1.53　X　10(-11),　1.29　X　10(-11),　and　8.90　X　10(-12)　cm(2)s(-1),　respectively.