Cathode material, electrochemical device and electronic device using same
A positive electrode material and atomic cluster technology, which is applied in the field of electrochemical devices and electronic devices, can solve problems such as lithium-ion batteries are prone to produce by-products, affect the cycle performance of lithium-ion batteries, and adversely affect the performance of lithium-ion batteries.
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[0055] In some embodiments, the preparation method of the positive electrode material further includes:
[0056] (4) The positive electrode material obtained in step (3) is crushed, passed through a 500-mesh screen, and vacuum-packed.
[0057] In some embodiments, in step (2), the stirring rate is 35r / min to 60r / min.
[0058] In some embodiments, in step (3), the heating rate of the sintering is about 10° C. / min, the sintering temperature is 1000° C. to 1150° C., and the sintering atmosphere is an oxygen atmosphere.
[0059] In some embodiments, the precursor is Co 3 o 4 , the lithium salt is Li 2 CO 3 .
[0060] When using Co 3 o 4 as a precursor and using Li 2 CO 3 When used as a lithium salt, the positive electrode material can also be prepared by the following method:
[0061] (a) will Co 3 o 4 and Li 2 CO 3 Mixing so that the molar ratio of Li atoms to Co atoms is 1.05 to 1.06;
[0062] (b) adding oxides of M1 element and M2 element to the mixture of step (...
Embodiment 19
[0115] Electrolyte solution used in Example 19: 4 wt% of fluoroethylene carbonate (FEC) and 4 wt% of adiponitrile were added to the base electrolyte and mixed uniformly to obtain an electrolyte.
Embodiment 20
[0116] Electrolyte used in Example 20: Add 4wt% fluoroethylene carbonate (FEC) and 3wt% adiponitrile and 0.6wt% 1,3,6-hexanetricarbonitrile to the basic electrolyte and mix well get the electrolyte.
[0117] 4. Preparation of isolation membrane
[0118] A PE porous polymer film is used as a separator.
[0119] 5. Preparation of Li-ion battery
[0120] The positive electrode, the separator and the negative electrode are stacked in order, wound, placed in the outer package, injected with electrolyte, and packaged. Lithium-ion batteries are obtained through processes such as formation, degassing, and trimming.
[0121] 2. Test method
[0122] 1. Test method for cycle performance of lithium-ion batteries
[0123] (1) Test method under 4.55V voltage:
[0124] At room temperature (25°C), charge the lithium-ion battery with a constant current of 0.7C rate to a cut-off voltage of 4.55V, and then charge it at a constant voltage of 4.55V until the current is lower than 0.05C, so t...
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