Lithium ion battery gradient core shell cathode material and synthetic method thereof
A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve problems such as unstable structures, low material capacity, safety performance concerns, etc., and achieve the goal of improving cycle performance and material capacity Effect
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specific Embodiment approach 1
[0017] Specific implementation mode one: In this embodiment, during the synthesis process, the precursor Ni x co y mn z (OH) 2 It is a nuclear structure with a particle size of 5-10 microns; binary lithium nickel manganese oxide precursor Ni x mn y (OH) 2 For the second layer, the thickness of the layer is 2-5 microns; the precursor of monobasic lithium manganate MnCO 3 It is the outermost layer with a thickness of 2-5 microns, and it can also be the precursor of lithium cobalt oxide Co 3 o 4 or CoCO 3 , the layer thickness is 2-10 microns, the synthesis method is as follows:
[0018] 1. Weigh the nickel source compound, cobalt source compound and manganese source compound respectively according to the molar ratio of 1:1:1, 5:2:3, 6:2:2, 8:1:1 or 4:2:4, And dissolve in deionized water and mix evenly, add precipitant sodium hydroxide or sodium carbonate and a certain amount of complexing agent ammonia water dropwise, control the molar ratio of metal salt to ammonia wat...
specific Embodiment approach 2
[0022] Specific implementation mode 2: In this implementation mode, taking the ternary 5:2:3, the outermost layer is lithium manganate as an example, coprecipitation is used to prepare gradient core-shell positive electrode materials for lithium-ion batteries:
[0023] 1. Weigh nickel sulfate, cobalt sulfate, and manganese sulfate respectively in a molar ratio of 5:2:3, and dissolve them in deionized water and mix them evenly. Add 2mol / L precipitating agent sodium hydroxide and a certain amount of complexing agent ammonia water one by one. Add it dropwise, control the molar ratio of metal salt and ammonia water to 1:0.75, the pH value of the reaction is between 10-11, react at 60°C for 12h, and stir continuously at a speed of 600 rpm to synthesize the precursor of the ternary cathode material (Ni 0.5 co 0.2 mn 0.3 )(OH) 2 .
[0024] In this embodiment, the ternary precursor can be commercially purchased and ready-made.
[0025] 2. Use the ternary precursor synthesized in ...
specific Embodiment approach 3
[0033] Specific embodiment three: the difference between this embodiment and specific embodiment two is that LiNi 0.5 co 0.2 mn 0.3 o 2 As the core material, then coated with spinel LiMn 2 o 4 , and finally coated with spinel LiNi 0.5 mn 1.5 o 4 .
[0034] Mn dissolves in the electrolyte, and trivalent Mn can induce the Jahn-Teller effect, and the outermost layer of lithium nickel manganese oxide can effectively prevent this effect.
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