Compositions and methods for energy storage devices having improved performance
A technology of energy storage devices and dry adhesives, which can be used in active material electrodes, structural parts, electrochemical generators, etc., and can solve problems such as structural electrode performance limitations
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Embodiment 1
[0107] Example 1: Thick Electrode
[0108] A dry battery anode was fabricated comprising 96 wt% graphite and 4 wt% binder, wherein the binder comprised 2 wt% PTFE, 1 wt% CMC and 1 wt% PVDF, making up the 4 wt% binder in total . A cathode comprising 94 wt% NMC622, 3 wt% conductive additive and 3 wt% polymer binder was also fabricated in a dry process. In addition, wet electrodes were fabricated with the following composition: wet anode comprising 95.7 wt% graphite, 1% conductive additive and 3.3 wt% polymer binder, and wet cathode comprising 91.5 wt% active component and 4.4 wt% conductive additive and 4.1% by weight polymer binder. Other electrode membrane compositions can be envisioned and prepared, and the disclosure herein is not limited to the particular compositions disclosed.
[0109] Four Li-ion batteries were assembled following the scheme in Table 1. The specific capacity of each lithium-ion battery in Table 1 was tested (see Figure 5A ), Coulombic efficiency ...
Embodiment 2
[0118] Embodiment 2: the specific capacity of thick dry electrode
[0119] Table 3 provides electrode specifications for thick NMC622 cathodes and thick graphite anodes. The NMC622 cathode consisted of 94wt% NMC622, 2wt% porous carbon, 1wt% conductive carbon and 3wt% PTFE. The graphite anode consisted of 96 wt% graphite, 1.5 wt% CMC, 0.5 wt% PVDF and 2 wt% PTFE. Figure 12 with 13 Half-cell first-cycle results were recorded for dry NMC622 and graphite electrodes, respectively. Figure 12 The half-cell in is charged at room temperature with a constant current of C / 20 to 4.3 V cutoff, then charged at constant voltage to C / 40 cutoff, and then discharged at room temperature with a constant current of C / 20 to 2.7 V cutoff. Figure 13 The half-cell in is charged at room temperature with a constant current of C / 20 to 5 mV cutoff, then charged at constant voltage to C / 40 cutoff, and discharged at room temperature with a constant current of C / 20 to 2 V cutoff. As recorded in Tabl...
Embodiment 3
[0126] Example 3: Thick electrode charge and discharge performance
[0127] Figure 15A with 15B Discharge rate voltage curves for dry and wet coated electrodes are provided, respectively. The active materials used in both coating techniques are NMC622 for the cathode and graphite for the anode. The wet NMC622 cathode consisted of approximately 92 wt% NMC622, 4 wt% conductive carbon and 4 wt% PVDF. With 41.0mg / cm 2 The loading of the wet NMC622 cathode was obtained to obtain a thick film of 155 μm, a porosity of 36%, and a porosity of 2.66 g / cm 3 electrode film density. The wet graphite anode consisted of approximately 96 wt% graphite, 1 wt% conductive carbon, and 3 wt% CMC / styrene-butadiene binder. With 24.5mg / cm 2 A wet graphite anode was formed with a load of 182 μm thick film, 37.5% porosity and 1.35 g / cm 3 electrode film density.
[0128] The dry NMC622 cathode consisted of approximately 95 wt% NMC622, 2 wt% porous carbon, 1 wt% conductive carbon, and 2 wt% PTF...
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