Nested V2O3-cladding lithium vanadium phosphate lithium ion anode material
A technology for coating lithium vanadium phosphate and positive electrode materials, which is applied in the direction of positive electrode, battery electrode, active material electrode, etc., can solve the problems of high sintering temperature and complicated coating process, achieve uniform coating, improve cycle performance, temperature low effect
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[0031] Example 1
[0032] This embodiment includes the following steps:
[0033] (1) Weigh 12.87g (0.11mol) of ammonium metavanadate, 15.59g of lithium dihydrogen phosphate (0.15mol, serving as both phosphorus source and lithium source), and 14.50g (0.12mol) of oxalic acid dihydrate, mix and add 0.37 L deionized water, the concentration of vanadium ions in the solution is 0.3mol / L; at an ultrasonic frequency of 30kHz, a stirring speed of 250r / min, stirring for 1h to obtain a mixed solution;
[0034] (2) Spray drying the mixed solution obtained in step (1), the spray drying air inlet temperature is 230°C, the spray drying peristaltic pump speed is 1000rpm / min, and the spray drying fan speed is 100HZ to obtain solid powder;
[0035] (3) The solid powder obtained in step (2) is roasted at 450°C for 5 hours under the protection of high-purity argon, and then cooled to room temperature with the furnace to obtain a nested V 2 O 3 Coated Li 3 V 2 (PO 4 ) 3 Lithium-ion cathode material. Wher...
Example Embodiment
[0041] Example 2
[0042] This embodiment includes the following steps:
[0043] (1) Weigh 6.43g (0.055mol) of ammonium metavanadate, 4.55g (0.0275mol) of vanadium pentoxide, 3.59g (0.15mol) of lithium hydroxide, 17.25g (0.15mol) of ammonium dihydrogen phosphate, 1.38 formic acid g (0.03mol), 10.08g (0.08mol) of oxalic acid dihydrate; mix it into 0.525L of deionized water; at an ultrasonic frequency of 20kHz, a stirring speed of 100r / min, stirring for 1.5h to obtain a mixed solution;
[0044] (2) Spray drying the mixed solution obtained in step (1), the spray drying air inlet temperature is 200°C, the spray drying peristaltic pump speed is 500rpm / min, and the spray drying fan speed is 40HZ to obtain solid powder;
[0045] (3) The solid powder obtained in step (2) is roasted at 500°C for 6 hours under the protection of high-purity hydrogen / argon mixed gas (hydrogen volume concentration is 5%), and then cooled to room temperature with the furnace to obtain a nested V 2 O 3 Coated Li 3 V...
Example Embodiment
[0048] Example 3
[0049] This embodiment includes the following steps:
[0050] (1) Weigh 10.91g (0.06mol) of vanadium pentoxide, 5.54g (0.075mol) of lithium carbonate, 17.25g (0.15mol) of ammonium dihydrogen phosphate, 18.99g (0.15mol) of oxalic acid dihydrate, and add them together. 0.3L deionized water; at an ultrasonic frequency of 40kHz and a stirring speed of 400r / min, the reaction is stirred for 2h to obtain a mixed solution;
[0051] (2) Spray drying the solution obtained in step (1), the spray drying air inlet temperature is 260°C, the spray drying peristaltic pump speed is 1800rpm / min, and the spray drying fan speed is 150HZ to obtain solid powder;
[0052] (3) The solid powder obtained in step (2) is roasted at 500°C for 6 hours under the protection of high-purity argon, and then cooled to room temperature in the furnace to obtain a nested V 2 O 3 Coated Li 3 V 2 (PO 4 ) 3 Lithium-ion cathode material. Where V 2 O 3 Relative Li 3 V 2 (PO 4 ) 3 The mass ratio is 7.35%.
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