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Abstract Manganese vanadate (Mn 2 V 2 O 7) nanosheets on titanium (Ti) foil are synthesized by a cation-exchange method using sodium vanadate nanowires as the precursor. By varying the cation-exchange time in manganese acetate (Mn(CH 3 COO) 2) aqueous solution, the tunable morphologies and chemical components of the samples are tested, compared and presented in detail. The evolution process contains cation-exchange of Mn2+ and Na+, newly generated H+ to dissolve vanadate, and precipitation manganese vanadate nanosheets on the original sodium vanadate nanowire surface. Furthermore, the thermal and crystal properties of the as-prepared nanosheets are evaluated by calcinations at different temperatures. The Mn 2 V 2 O 7 nanosheets obtained at 250 °C, which are used as electrode of lithium-ion battery, have the first discharge capacity of 1048.0 mAh g−1 at 50 mA g−1. After 100 cycles, the residual capacity is more than 800 mAh g−1. Graphical abstract Manganese vanadate nanosheets on titanium foil are successfully assembled using a cation-exchange method for the first time. As an electrode material, it presents good cyclic performance and high charge-discharge capacity. Image 1 Highlights • Manganese vanadate nanosheets are successfully prepared using a cation-exchange method. • Manganese vanadate nanosheets on titanium foil present a high electrochemical performance for lithium ion battery. • The evolution in this work opens a new way to fabricate inorganic vanadates. [ABSTRACT FROM AUTHOR]