Positive electrode additive and preparation method thereof, positive electrode and preparation method thereof, and lithium ion battery
A technology of additive and positive electrode, applied in the field of positive electrode additive and its preparation, can solve the problems of burning, increasing safety hazards, unstable interface between positive electrode material and organic electrolyte, etc.
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[0051] Such as figure 1 Shown, the preparation method of positive electrode of one embodiment, comprises the following steps:
[0052] Step S110: mixing the positive electrode material, the positive electrode additive, the binder, the conductor and N-methylpyrrolidone to obtain the positive electrode slurry.
[0053] In one of the embodiments, step S110 includes: under the condition of continuous stirring, mixing the binder with N-methylpyrrolidone, and then sequentially adding the conductor, the positive electrode additive and the positive electrode material to obtain the positive electrode slurry, so that the positive electrode The slurry is mixed more evenly.
[0054] It should be noted that step S110 is not limited to the above steps, for example, in another embodiment, the positive electrode material, positive electrode additive, binder, conductor and N-methylpyrrolidone can also be directly stirred and mixed.
[0055] Wherein, the positive electrode material can be a c...
Embodiment 1～10
[0073] The preparation process of the positive electrode additive of embodiment 1~10 is as follows:
[0074] In terms of mass percentage, each raw material was weighed according to Table 1; the binder and the organic solvent were mechanically stirred and mixed for 1 hour to obtain a premixed solution, and then carbon-coated lithium manganese iron phosphate, inorganic materials and conductive agents were added to the The premixed solution was mechanically stirred for 0.5 hours, and then sanded in a sand mill for 2 hours, so that lithium manganese iron phosphate, inorganic materials and conductive agents were dispersed in the premixed solution to obtain a positive electrode additive. Wherein, the mass percentage of carbon in the carbon-coated lithium manganese iron phosphate used in Examples 1-10 is shown in Table 2.
[0075] Table 1
[0076]
[0077]
[0078] Wherein, "--" in Table 1 means that there is no such substance or the content of the substance is 0; Titanium ox...
Embodiment 11
[0082] The preparation process of the positive electrode of this embodiment is roughly the same as that of Example 7, the difference is that the preparation of the positive electrode additive in step (1) of this embodiment is different, and there is no inorganic material, binder and Conductive agent, preparation process is as follows:
[0083] In terms of mass percentage, each raw material was weighed according to Table 1; the organic solvent and the carbon-coated lithium manganese iron phosphate were mechanically stirred for 0.5 hours, and then sanded in a sand mill for 2 hours to obtain the positive electrode additive. Wherein, the mass percentage of carbon in the carbon-coated lithium manganese iron phosphate used in this example is the same as that in Example 7.
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