Carbon material for lithium ion secondary batteries
A secondary battery and lithium ion technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of irreversible capacity increase, etc., and achieve the effects of excellent high-temperature storage characteristics, less gas generation, and high capacity
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Embodiment 1
[0183] With the spherical natural graphite that measures in the above-mentioned measuring method, surface functional group amount O / C value is 2.90% in the mixed acid solution of concentrated hydrochloric acid (33wt%) and concentrated nitric acid (40wt%) (concentrated hydrochloric acid: concentrated nitric acid (weight ratio) =1:1) at 80°C for 4 hours, washed with pure water until the pH became 4 or more, and filtered. Furthermore, the sample obtained here was stirred in concentrated sulfuric acid (93 wt%) at 80° C. for 4 hours, washed with pure water until the pH became 4 or higher, and then kept at 300° C. for 6 hours to obtain a sample. Measure particle size d50, tap density, BET specific surface area (SA), Raman R value, surface functional group amount O / C value, surface functional group amount S 165 / C value, Cl / C value of surface functional groups, 3R / 2H, fluidity index a, expansion of laminated battery during 24-hour high-temperature endurance test at 85°C (referred to ...
Embodiment 2
[0185] The spherical natural graphite measured in the above-mentioned measuring method, the surface functional group amount O / C value is 3.04% in the mixed acid solution of concentrated hydrochloric acid and concentrated nitric acid (concentrated hydrochloric acid: concentrated nitric acid (weight ratio)=1: 1) at 80 The mixture was stirred for 8 hours at °C, washed with pure water until the pH became 4 or more, and filtered. Furthermore, the sample obtained here was stirred in concentrated sulfuric acid at 80° C. for 4 hours, washed with pure water until the pH became 4 or higher, and then kept at 300° C. for 6 hours to obtain a sample. The same measurement as in Example 1 was performed on this. The results are shown in Table 1.
Embodiment 3
[0187] The spherical natural graphite measured in the above-mentioned measuring method, the surface functional group amount O / C value is 3.66% in the mixed acid solution (concentrated hydrochloric acid: concentrated nitric acid (weight ratio)=1: 1) of concentrated hydrochloric acid and concentrated nitric acid at 80 °C for 2 hours, washed with pure water until the pH became 4 or more, and filtered. Furthermore, the sample obtained here was stirred in concentrated sulfuric acid at 80° C. for 2 hours, washed with pure water until the pH became 4 or higher, and then kept at 300° C. for 6 hours to obtain a sample. The same measurement as in Example 1 was performed on this. The results are shown in Table 1.
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