High magnifying power lithium-rich manganese-based cathode material with nano/microstructure
A cathode material, lithium-rich manganese-based technology, which is applied in the field of high-rate lithium-rich manganese-based cathode materials and their preparation, can solve the problems of rapid capacity decay, low conductivity of lithium-rich manganese-based cathode materials, and poor high-rate performance. Achieve the effect of reliable performance improvement, obvious performance improvement and simple process
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[0030] Example 1:
[0031] Weigh manganese sulfate, polyvinylpyrrolidone and sodium chlorate in a molar ratio of 1:1.1:3, stir and dissolve them with deionized water until they are clear, and transfer the mixed solution into a high-pressure reactor lined with polytetrafluoroethylene. Put it in an oven at 180℃, control the reaction time to 12h. After the reactor is naturally cooled to room temperature, filter to obtain a black precipitate, wash it repeatedly with deionized water and ethanol to a pH of 7, and place it in an oven at 110℃ to dry for 48h , The obtained black manganese dioxide powder has a radial hollow nanostructure formed by the self-assembly of nanorods, such as figure 1 , 2 Shown
[0032] Weigh out lithium hydroxide, nickel acetate, and manganese dioxide according to the molar ratio Li:Ni:Mn=1.2:0.2:0.6, and mix them evenly in a mixed solution of deionized water and ethanol; heating at a rate of 2℃ / min from room temperature Raise to 500℃, pre-sinter for 5h, then rai...
Example Embodiment
[0034] Example 2:
[0035] Weigh out manganese nitrate, polyvinylpyrrolidone and sodium chlorate in a molar ratio of 1:1:4, stir and dissolve them with deionized water until clear, transfer the mixed solution into a high-pressure reactor lined with polytetrafluoroethylene, and Place in an oven at 200℃, control the reaction time to 10h, wait until the reactor is naturally cooled to room temperature, filter to obtain a black precipitate, wash it repeatedly with deionized water and ethanol to pH 7, and place it in an oven at 110℃ to dry for 48h , The obtained black manganese dioxide powder has a radial hollow nanostructure formed by the self-assembly of nanorods;
[0036] Weigh out lithium acetate, cobalt acetate, and manganese dioxide in a molar ratio of Li:Co:Mn=1.2:0.2:0.6, and mix them evenly in a mixed solution of deionized water and ethanol; increase from room temperature at a heating rate of 2°C / min To 500 ℃, pre-sintering for 5 hours, and then at the same heating rate to 750 ...
Example Embodiment
[0038] Example 3:
[0039] Weigh out manganese oxalate, cetyltrimethylammonium bromide and sodium chlorate in a molar ratio of 1:1:4, stir and dissolve with an appropriate amount of deionized water until it is clear, and transfer the mixed solution into a polytetrafluoroethylene lined In the autoclave, place it in an oven at 200°C, and control the reaction time to 10h. After the reactor is naturally cooled to room temperature, filtered to obtain a black precipitate, which is washed repeatedly with deionized water and ethanol to a pH of 7, and placed in Dry in an oven at 110°C for 48 hours to obtain black manganese dioxide powder with a radial hollow nanostructure formed by self-assembly of nanorods;
[0040] Weigh lithium oxalate, nickel oxalate, and manganese dioxide according to the molar ratio Li: Mn: Ni = 1.13: 0.3: 0.57, and mix them evenly in a mixed solution of deionized water and ethanol; increase from room temperature at a heating rate of 2°C / min To 500 ℃, pre-sintering f...
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