Coating of disordered carbon active material using water-based binder slurry
A water-based binder and binder technology, applied in the direction of adhesive, binder type, cellulose binder, etc., can solve the problems of easy deterioration, unsuitable for bonding disordered carbon active materials, etc.
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Embodiment 1-B
[0050] 1-B. Example 1-B: Half-Cell Testing of the First Water-Based Binder Slurry
[0051] The coated electrodes from Example 1-A were paired with lithium metal to make half cells, some of which had no J2 flame retardant additive in the electrolyte and others included 6 wt.% J2 flame retardant in the electrolyte additive.
[0052] The half-cells were subjected to three formation cycles in a battery test rig available from Arbin Instruments, College Station, Texas. During each formation cycle, the half-cell was charged to 1.5V at C / 10. During the first formation cycle, the half-cell was discharged to 0.002V at C / 20. During the second and third formation cycles, the half-cell was discharged to 0.002 V at C / 10 and then held at constant voltage until 1 mA. Rest the half-cell for 10 minutes between charging and discharging.
[0053] During the first formation cycle (the results of which are provided in image 3 Middle), the hard carbon electrode achieved a reversible specifi...
Embodiment 2-B
[0067] 2-B. Example 2-B: Half-cell testing of the second water-based binder slurry
[0068] Day 2, 6, and 8 electrodes from Example 2-A were paired with lithium metal to make half cells, some of which had no J2 flame retardant additive in the electrolyte and some of which had 6 wt.% of J2 flame retardant additive was included in the electrolyte.
[0069] During the formation test, half cells were charged to 1.5 V at C / 10 and discharged to 0.002 V at C / 20, then discharged at a constant voltage up to 1 mA for three cycles. The first cycle formation results are provided at Figures 8A-8C , and the third cycle formation results are provided in Figures 9A-9C middle. The formation capacity results between the Day 2, Day 6, and Day 8 samples were very consistent, indicating the stability of the water-based hard carbon binder slurry.
[0070] During the charge rate test, half cells were charged to 1.5V at different rates and discharged to 0.002V at C / 2, and then discharged at a...
Embodiment 2
[0073] 2-C. Example 2-C: Full Cell Testing of Second Water-Based Binder Slurry
[0074] The Day 6 electrodes from Example 2-A were paired with NMC electrodes to make full cells, some of which had no J2 flame retardant additive in the electrolyte, while others included 6 wt.% J2 flame retardant additive in the electrolyte. fuel additives. Hard carbon electrodes have 7.0mg / cm per side 2 The average coating weight, and the NMC electrode has each side 15.1mg / cm 2 The average coating weight of , resulting in an N / P ratio of 1.31 and a full battery capacity of 27.5mAh. At this N / P ratio of 1.31, more negative potentials are available in hard carbon electrodes (anodes) than positive potentials are available in NMC electrodes (cathodes). Therefore, the NMC electrode should run out of capacity before the voltage of the hard carbon electrode drops too low (e.g., below 0 V (vs. Li reference)), which will avoid Li dendrite formation.
[0075] During the formation test, the full cell...
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