纳米LiMnPO4的制备与电化学性能表征

doi:10.3866/PKU.WHXB201401074

Abstract

Abstract:

Nano-LiMnPO₄ samples were synthesized via a two-step heating polyol method. The role of the first thermal plateau temperature T₁ (T₁=100, 110, 120, 130, 140, 150 ℃) on the physical and electrochemical properties of the samples was investigated. Their structures and morphologies were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and N₂ sorption measurements. All samples at different plateau temperatures exhibited a sheet structure. At T₁=100-120 ℃, samples contained some impurities, and their specific surface areas were <15 m²·g^-1. Pure nano-LiMnPO₄ was obtained at T₁=130 ℃, and exhibited the largest specific surface area (46.3 m²·g^-1). The specific surface areas of samples remained at 35-37 m²·g^-1 with further increase in T₁. The electrochemical performance of the nano-LiMnPO₄ samples followed the same trend as their specific surface areas. Nano-LiMnPO₄ at T₁=130 ℃ exhibited the best electrochemical performance, with a discharge capacity of 129 mAh·g^-1 at 0.1C rate and 81 mAh·g^-1 at 5C rate. This indicated that the specific surface area is one of the key factors in determining the electrochemical performance of LiMnPO₄.

Key words: Lithium-ion battery, Cathode material, Nano-LiMnPO₄, Specific surface area, Polyol method

MSC2000:

O646

YANG Wen-Chao, BI Yu-Jing, YANG Bang-Cheng, WANG De-Yu, SHI Si-Qi. Preparation and Electrochemical Characterization of Nano-LiMnPO₄[J].Acta Phys. -Chim. Sin., 2014, 30(3): 460-466.

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Preparation and Electrochemical Characterization of Nano-LiMnPO₄

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Preparation and Electrochemical Characterization of Nano-LiMnPO₄