Well-dispersed LiMnPO4 plates with thickness of about 100nm were synthesized by a facile hydrothermal method at 200°C for 10h. The crystalline structure, morphology and microstructure were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM). The LiMnPO4 electrode exhibits high discharge capacity, good rate capability and high cycling stability. At a 0.05C rate, the plates delivered a discharge capacity of 139.2mAhg−1 at 25°C and 158.7mAhg−1 at 50°C. At elevated temperature (50°C), the plates showed an enhanced rate capability, achieving a discharge capacity of 147.6, 141.4, 133.6, 121.4, and 110.7mAhg−1 at 0.1, 0.2, 0.5, 1, and 2C, respectively. Moreover, the plates had good cycling stability, retaining 92% of the initial capacity at 25°C and 91% at 50°C over 50 cycles at 0.1C. The excellent electrochemical performance of this material is attributed to its high specific surface area, large percentage of exposed (010) facets as well as small thickness along the [010] direction.