NASICON sodium titanium phosphate coated sodium ferric phosphate positive electrode material and preparation method thereof
A technology for coating sodium iron phosphate and cathode materials with sodium titanium phosphate, which is applied in battery electrodes, structural parts, electrical components, etc., to reduce side reactions, enhance rate performance, and improve batch stability.
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[0029] The invention provides a preparation method of NASICON sodium titanium phosphate coated sodium iron phosphate positive electrode material, comprising the following steps:
[0030] 1) mixing phosphorus source, titanium source, sodium source and dispersant solution and grinding to obtain sodium titanium phosphate precursor slurry;
[0031] 2) after the sodium ferric phosphate and the dispersant solution are mixed, the sodium ferric phosphate slurry is obtained;
[0032] 3) After mixing the sodium iron phosphate slurry and the sodium titanium phosphate precursor slurry, shear dispersion, spray drying, and roasting are performed in sequence to obtain the NASICON sodium titanium phosphate-coated sodium iron phosphate positive electrode material.
[0033] In the present invention, the phosphorus source comprises one or more of phosphoric acid, ammonium monohydrogen phosphate, ammonium dihydrogen phosphate, sodium dihydrogen phosphate and disodium hydrogen phosphate, preferabl...
Embodiment 1
[0056] The preparation method of NASICON sodium titanate phosphate-coated sodium iron phosphate cathode material comprises the following steps:
[0057] 1) 6.0g of CMC powder was dissolved in 520g of ultrapure water, sheared and dispersed for 5 minutes to make it completely dispersed, then 172.5g of ammonium dihydrogen phosphate, 79.9g of anatase titanium dioxide and 26.5g of sodium carbonate were added in sequence, and the shearing and dispersion continued. For 5 min, the mixed slurry was then transferred to a sand mill containing zirconia balls with a diameter of 0.1 mm, and ground at a linear speed of 20 m / s for 6 h to obtain a sodium titanium phosphate precursor slurry with a particle size of 230 nm;
[0058] 2) 300.0g of sodium iron phosphate cathode material with an iron-to-phosphorus ratio of 0.955:1 was dispersed in a CMC solution containing 450.0g of 2%, sheared and dispersed for 5 minutes and then added 35.6g of sodium titanium phosphate precursor slurry, first disper...
Embodiment 2
[0062] The preparation method of NASICON sodium titanate phosphate-coated sodium iron phosphate cathode material comprises the following steps:
[0063] 1) Dissolve 6.0g of CMC powder in 520g of ultrapure water, shear and disperse for 5 minutes to make it completely dispersed, then add 97.9g of ammonium dihydrogen phosphate, 79.9g of brookite-type titanium dioxide and 67.2g of sodium bicarbonate in sequence, and continue to shear Cut and disperse for 5 minutes, then transfer all the mixed slurry to a sand mill containing 0.15mm zirconia balls, and grind at a linear speed of 16m / s for 7h to obtain a sodium titanium phosphate precursor slurry with a particle size of 230nm;
[0064] 2) 300.0g of sodium iron phosphate cathode material with an iron-to-phosphorus ratio of 0.955:1 was dispersed in a CMC solution containing 450.0g of 2%, sheared and dispersed for 5 minutes, and then added 59.2g of sodium titanium phosphate precursor slurry, first dispersed at 10Hz low speed 5min, and ...
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Abstract
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