Negative electrode for lithium ion secondary cell, and lithium ion secondary cell
A secondary battery, lithium ion technology, applied in the direction of secondary batteries, battery electrodes, circuits, etc., can solve the problems of deterioration of lithium ion acceptance, reduced charging characteristics of secondary batteries, inability to obtain sufficient battery capacity, etc. Discharge characteristics, prevention of lithium precipitation, and effect of improving acceptability
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Embodiment 1
[0101] One side will be coated with artificial graphite (D 50 : 8μm, BET specific surface area: 2.3m 2 / g) 85.0g, lithium titanate (Li 4 Ti 5 o 12 )10.5g (D 50 : 5 μm), 1.5 g of carbon black (SUPER C65 manufactured by IMERYS Co., Ltd.) as a conductive additive, and 3.0 g of polyvinylidene fluoride (PVdF, manufactured by Kureha Co., Ltd., KF Polymer#9300) as a binder were added appropriately In N-methyl-pyrrolidone, stirring and mixing were performed to prepare a slurry-like dispersion liquid.
[0102] Here, the coated artificial graphite was produced in the following manner.
[0103] Pulverize petroleum coke and D 50 Adjusted to 6 μm, graphitized at 3000° C. to obtain a core material. Powdered isotropic petroleum-based pitch was dry-mixed in an amount of 1 part by mass based on 100 parts by mass of the core material, and heated at 1100° C. for 1 hour in an argon atmosphere to obtain coated artificial graphite.
[0104]A negative electrode for battery evaluation was obt...
Embodiment 2
[0108] Except for changing from coated artificial graphite to uncoated artificial graphite (D 50 : 8μm, BET specific surface area: 6.0m 2 A negative electrode for battery evaluation was obtained in the same manner as in Example 1 except that / g). The coating amount of the obtained electrode was 7 mg / cm 2 , the electrode density is 1.3g / cm 3 .
[0109] Here, the above-mentioned uncoated artificial graphite is obtained by pulverizing petroleum-based coke and 50 Adjusted to 6 μm, obtained by graphitizing at 3000°C.
[0110] D of artificial graphite 50 , BET specific surface area, R value, d 002 , D of lithium titanate 50 , the ratio of lithium titanate to the total mass of artificial graphite and lithium titanate, and the cell voltage are shown in Table 1.
Embodiment 3
[0112] A negative electrode for battery evaluation was obtained in the same manner as in Example 1, except that the carbon black of the conductive additive was changed to vapor-phase carbon fiber VGCF (registered trademark, manufactured by Showa Denko Co., Ltd., average fiber diameter: 150 nm, average fiber length: 6 μm). The coating amount of the obtained electrode was 7 mg / cm 2 , the electrode density is 1.3g / cm 3 .
[0113] D of artificial graphite 50 , BET specific surface area, R value, d 002 , D of lithium titanate 50 , the ratio of lithium titanate to the total mass of artificial graphite and lithium titanate, and the cell voltage are shown in Table 1.
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