Method for evaluating active materials for secondary batteries
A technology of active materials and secondary batteries, applied in battery electrodes, material excitation analysis, circuits, etc., to achieve the effect of performance
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Embodiment 1
[0098] The average particle size (D 50 ) of 16 μm spherical natural graphite and solid binder pitch with a softening point of 250°C were mixed in a weight ratio of 100:10, mechanically mixed in a high-speed stirrer at 2200 rpm for 10 minutes to prepare the mixture, and then passed in an electric furnace in The mixture was heated at 25-1100° C. for 2 hours, and kept at 1100° C. for 1 hour for sintering, thereby forming a shell on the surface of the core to prepare an anode active material in the form of core-shell particles.
[0099] Then, after mixing the prepared anode active material, styrene-butadiene rubber (SBR) and carboxymethyl cellulose (CMC) as a thickener in a mass ratio of 97.8:1.2:1.0, they were dispersed in deionized distilled water to The composition was prepared, coated on the surface of a Cu foil current collector, dried, and rolled to form an anode active material layer with a size of 10 cm × 10 cm × 50 μm to produce an electrode with a density of 1.50 ± 0.05 ...
Embodiment 2
[0108] In addition to the average particle size (D 50 ) of spherical natural graphite of 16 μm and a solid-type binder pitch of 250° C. with a softening point of 250° C. were mixed in a weight ratio of 100:15 to prepare a mixture, and the shell of the active material was evaluated under the same conditions and methods as in Example 1.
Embodiment 3
[0110] The shell of the active material was evaluated under the same conditions and method as in Example 1, except that a liquid binder pitch having a softening point of 250° C. was used instead of a solid type binder pitch having a softening point of 250° C. to prepare a mixture.
[0111] [Table 1]
[0112]
[0113]
[0114] Table 1 and Figure 1-3 As shown, it can be easily confirmed that the size of the shell thickness of each active material increases in the following order: Example 1 (0.67)
[0115] In addition, it can be confirmed that the uniformity (0.24) of the shell thickness of each active material of Example 1 is the same as the uniformity (0.24) of the shell thickness of Example 2, compared with Example 1 and Example 2, Example 3 The uniformity of shell thickness (0.20) is more excellent.
PUM
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