Negative electrode material for lithium ion battery and its use
A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of increased internal resistance, short charge and discharge cycle life of lithium ion batteries, and inability to obtain capacity, and achieves large discharge capacity. , The effect of large-capacity charge-discharge cycle characteristics
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Embodiment 1
[0174] Crushed petroleum-based coke and heat-treated it in an Acheson electric furnace at 3000°C to obtain a 10% particle size (D10) of 7.8 μm and a BET specific surface area of 1.9 m 2 / g, d002 are 0.3359nm, Lc is 154nm, 50% particle size (D50) is 22.1 μ m, 90% particle size (D90) is 46.1 μ m, and I G / I D Scale-like artificial graphite particles (B1) having a (G value) of 16.7. When the optical structure is observed with a polarizing microscope in a rectangular field of view of 480 μm × 640 μm in the cross-section of the molded body made of B1, the cumulative area from the small structure is measured, and the cumulative area reaches 60% of the total optical structure area. The area of the optical structure (SOP), the result is 13.4μm 2 . In addition, the number of tissues was counted from the one with the smaller aspect ratio, and the aspect ratio (AROP) of the 60th% of the total number of tissues was 2.14.
[0175] Next, as the mass ratio of the sum of non-carbonace...
Embodiment 2
[0178] Except that the amount of the petroleum pitch-derived component was 20% by mass, a composite was produced in the same manner as in Example 1, and the discharge capacity, cycle characteristics, Raman G value, specific surface area, d002, and D50 were evaluated. The results are shown in Tables 1 and 2.
Embodiment 3
[0180] Except that the amount of the above-mentioned petroleum pitch-derived components was 30% by mass, a composite was produced in the same manner as in Example 1, and the discharge capacity, cycle characteristics, Raman G value, specific surface area, d002, and D50 were evaluated. The results are shown in Tables 1 and 2. In addition, the scanning electron micrograph of the obtained complex is shown in figure 1 .
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