In-situ growth of LiMnPO4 on porous LiAlO2 nanoplates substrates from AAO synthesized by hydrothermal reaction with improved electrochemical performance

•An in-situ growth hydrothermal method to synthesize LiAlO2-LiMnPO4/C composite is present.•Anodic aluminum oxide (AAO) is used as substrates to synthesis α-LiAlO2 phase.•Minor LiAlO2 coexisted play an important role in improving the lithium diffusion ability and rate-capability.•The one with 6wt.% content LiAlO2-LiMnPO4/C exhibits a high specific discharge capacity of 142.8 mAh/g at 0.05C.