Lithium ionic cell composite positive pole material coated by orthosilicate and its preparation method
A composite positive electrode material and lithium-ion battery technology, which is applied in the direction of electrode manufacturing, battery electrodes, chemical instruments and methods, etc., can solve the problems of poor electrochemical performance of positive electrode materials, and improve the anti-overcharge performance and thermal stability. Ease of large-scale production and convenient operation
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Embodiment 1
[0027] 1.1791g (4.8mmol) of Mn(CH 3 COO) 2 Dissolve in a mixed solution of 10mL deionized water and 10mL ethanol, reflux and stir at 80°C for 1 hour, add 1.0289g (4.8mmol) of tetraethyl orthosilicate dropwise to the above mixed solution, stir for 12 hours, and 30g cathode material LiCoO 2 Add it, and then mechanically stir for 180 minutes to form a suspension, dry the suspension at 120°C for 12 hours, and then bake the sample at 700°C for 5 hours to obtain MnSiO 4 Coated LiCoO 2 . The coated product was tested by XRD, and the characterization results were as follows: figure 1 As shown, the product is α-NaFeO with a single crystal phase 2 type layered structure. The obtained electrode material was mixed with acetylene black conductive agent and PVDF binder in a mass ratio of 90:5:5, coated on the aluminum foil of the current collector, dried at 80°C, and then used a punching machine to make an electrode sheet with a diameter of 1 cm. The metal lithium sheet is the negati...
Embodiment 2
[0029] 0.9696g (2.4mmol) of Fe(NO 3 ) 3 and 0.2448g (2.4mmol) of CH 3 COOLi was dissolved in a mixed solution of 5mL deionized water and 10mL ethanol. After reflux stirring at 80°C for 0.5 hours, 0.5000g of tetraethyl orthosilicate was added dropwise to the above mixed solution. After stirring for 20 hours, 35g of positive electrode material LiCoO 2 Add it into it, form a suspension after mechanical stirring for 120 minutes, dry the suspension at 150°C for 15 hours, and then bake the sample at 650°C for 8 hours to obtain LiFeSiO 4 Coated LiCoO 2 Material. The XRD test of the coating material shows that the product is σ-NaFeO with a single crystal phase 2 type layered structure, electrochemical tests and thermal analysis results show that LiFeSiO 4 Coated LiCoO 2 The material has good anti-overcharge performance and thermal stability.
Embodiment 3
[0031] 1.3522g (8.0mmol) of MnSO 4 ·H 2 O was dissolved in a mixed solution of 15mL deionized water and 10mL ethanol, and after reflux and stirring at 90°C for 2 hours, 1.6666g (8.0mmol) ethyl tetrasilicate was added dropwise to the above mixed solution, and after stirring for 8 hours, the 30g cathode material LiCoO 2 Add it into it, form a suspension after mechanical stirring for 120 minutes, dry the suspension at 100°C for 10 hours, and then bake the sample at 700°C for 8 hours to obtain MnSiO 4 Coated LiCoO 2 . The XRD test of the coated product shows that the product is σ-NaFeO with a single crystal phase 2 type layered structure, electrochemical tests and thermal analysis results show that MnSiO 4 Coated LiCoO 2 It has good anti-overcharge performance and thermal stability.
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