A kind of preparation method of sodium ferric pyrophosphate and its application in sodium ion battery
A technology of sodium iron pyrophosphate and phosphoric acid, which is applied in the direction of phosphate, phosphorus oxyacid, battery electrodes, etc. It can solve the problems of high rate performance, cycle life, poor conductivity, poor repeatability, difficulty in large-scale production, and complicated preparation process, etc. problems, to achieve the effect of uniform morphology, excellent cycle stability, and high surface activity
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Embodiment 1
[0038] 1) This example is designed to generate 0.03mol of the target product sodium iron pyrophosphate, add 0.03mol of ferrous oxide to 6.92g phosphoric acid (mass concentration is 85%), stir at 200℃ for 3 days, the white powder obtained is acetone After washing three times and filtering and drying, FeH is obtained 2 P 2 O 7 ,From Figure 4 It can be seen that the product obtained is pure phase FeH 2 P 2 O 7 .
[0039] 2) Combine 0.0315mol sodium oxalate with the FeH obtained in the above steps 2 P 2 O 7 Through high-energy ball milling, the precursor of sodium iron pyrophosphate is obtained;
[0040] 3) The precursor is placed in a hydrogen-argon mixed gas atmosphere, heated at 5°C / min to 580°C, sintered for 9 hours, and naturally cooled to room temperature to obtain sodium iron pyrophosphate material.
[0041] The composite cathode material of the sodium ion battery prepared in this embodiment and the sodium sheet are assembled to form a button battery. The material characterizatio...
Embodiment 2
[0047] This embodiment includes the following steps:
[0048] (1) This example is designed to generate 0.03mol of the target product sodium iron pyrophosphate, add 0.03mol of ferrous oxide to 6.92g phosphoric acid (85% by mass), and stir at 220°C for 3 days to obtain a white powder Washed with acetone for three times and filtered and dried to obtain FeH 2 P 2 O 7 ;
[0049] 2) Combine 0.0315mol sodium oxalate with the FeH obtained in the above steps 2 P 2 O 7 Through high-energy ball milling, the precursor of sodium iron pyrophosphate is obtained;
[0050] 3) The precursor is placed in a hydrogen-argon mixed gas atmosphere, heated at 5°C / min to 580°C, sintered for 9 hours, and naturally cooled to room temperature to obtain sodium iron pyrophosphate material.
[0051] The battery assembly and test methods of the material obtained in this example are the same as in Example 1, and the average particle size of the cathode material sodium iron pyrophosphate is 0.4 μm. The discharge capaci...
Embodiment 3
[0053] This embodiment includes the following steps:
[0054] 1) This example is designed to generate 0.03mol of the target product sodium ferric pyrophosphate, add 0.03mol of ferrous oxide to 6.92g of phosphoric acid (85% by mass), and stir at 200°C for 5 days. The white powder obtained is After washing three times with acetone, filter and dry to obtain FeH 2 P 2 O 7 ;
[0055] 2) Combine 0.0315mol sodium oxalate with the FeH obtained in the above steps 2 P 2 O 7 Through high-energy ball milling, the precursor of sodium iron pyrophosphate is obtained;
[0056] 3) The precursor is placed in a hydrogen-argon mixed gas atmosphere, heated at 5°C / min to 580°C, sintered for 9 hours, and naturally cooled to room temperature to obtain sodium iron pyrophosphate material.
[0057] The battery assembly and test methods of the material obtained in this example are the same as those in Example 1. The anode material sodium iron pyrophosphate has an average particle size of 0.5 μm, and the discharg...
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