Poor cycling performance is still a big challenge for aqueous lithium ion batteries (ALIBs), in which the instability of anode is considered to be the main obstacle. Herein, single crystalline (NH4)(0.5)V2O5 nanosheets are prepared by a simple hydrothermal method and proposed as a novel and stable anode for ALIBs for the first time. The ALIB consisting of LiMn2O4 cathode and (NH4)(0.5)V2O5 anode exhibits a discharge capacity of 100 mAh g(-1) (based on the mass of anode) at 30 mA g(-1) and a capacity retention of ca. 100% after 200 cycles. At 1500 mA g(-1), the discharge capacity of 61 mAh g(-1) is maintained after 1100 cycles, indicating excellent cycling stability. As verified, the superior cycling performance of ALIB should be mainly attributed to its ultrathin nanosheet morphology and intrinsic structure stability of (NH4)(0.5)V2O5 anode. (C) 2016 The Electrochemical Society. All rights reserved.