Manipulation of adipic acid application on the electrochemical properties of LiFePO4 at high rate performance

High performance nanocrystalline LiFePO4 was successfully synthesized utilizing a solid-state method with adipic acid as the carbon source. Different molar ratios of adipic acid to total metal ions were analyzed, which included the mol ratios 0, 0.05, 0.1, and 0.2. Among the different concentrations tests, 0.1 mol adipic acid-treated LiFePO4 exhibited superior performance in terms of capacity profile and a stable discharge behavior of ∼150 mAh/g at room temperature. The thickness of the carbon coating layer was confirmed at approximately 5 nm by transmission electron microscopy. Rate capability studies were also performed from 1.0 to 37 C for 0.1 mol adipic acid-treated LiFePO4. These studies clearly showed excellent capacity retention over 73 mAh/g at 37 C rate.

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