Abstract:This work introduces a new mechanically triggered thermal runaway mitigation mechanism. The homogenizer of electrode failure (HEF), multiwall carbon nanotube (MWCNT), was added into LiNi 0.5 Mn 0.3 Co 0.2 O 2 (NMC532) battery electrodes. We have studied the effect of the HEF additive on the internal electrical resistance and the mechanical impact resistance of the electrodes. The additional MWCNTs reduced the internal electrical resistance of electrodes before mechanical abuse. Upon mechanical abuse, they coul… Show more
“…The XRD pattern of NMO/CNT exhibits two broadened peaks at ca. 26° and 44° in NMO/CNT composite, which are associated with the graphitic planes (004) and (102) of the CNT, respectively [30, 31], suggesting that the NMO/CNT composite is successfully prepared.Fig. 2
a XRD patterns of NMO/CNT and NMO.…”
The aqueous sodium-ion battery (ASIB) is one of the promising new energy storage systems owing to the abundant resources of sodium as well as efficiency and safety of electrolyte. Herein, we report an ASIB system with Na4Mn9O18/carbon nanotube (NMO/CNT) as cathode, metal Zn as anode and a novel Na+/Zn2+ mixed ion as electrolyte. The NMO/CNT with microspherical structure is prepared by a simple spray-drying method. The prepared battery delivers a high reversible specific capacity and stable cyclability. Furthermore, the battery displays a stable reversible discharge capacity of 53.2 mAh g−1 even at a high current rate of 4 C after 150 cycles. Our results confirm that the NMO/CNT composite is a promising electrode cathode material for ASIBs.
“…The XRD pattern of NMO/CNT exhibits two broadened peaks at ca. 26° and 44° in NMO/CNT composite, which are associated with the graphitic planes (004) and (102) of the CNT, respectively [30, 31], suggesting that the NMO/CNT composite is successfully prepared.Fig. 2
a XRD patterns of NMO/CNT and NMO.…”
The aqueous sodium-ion battery (ASIB) is one of the promising new energy storage systems owing to the abundant resources of sodium as well as efficiency and safety of electrolyte. Herein, we report an ASIB system with Na4Mn9O18/carbon nanotube (NMO/CNT) as cathode, metal Zn as anode and a novel Na+/Zn2+ mixed ion as electrolyte. The NMO/CNT with microspherical structure is prepared by a simple spray-drying method. The prepared battery delivers a high reversible specific capacity and stable cyclability. Furthermore, the battery displays a stable reversible discharge capacity of 53.2 mAh g−1 even at a high current rate of 4 C after 150 cycles. Our results confirm that the NMO/CNT composite is a promising electrode cathode material for ASIBs.
“…A PTC material is designed such that phase transition takes place as the temperature reaches 125–150 °C at the local shorting site, which allows a significant volume expansion to cut off the ion/electron transportation; thus, heat generation is reduced. A somewhat similar method is to add damage homogenization (DH) additives in electrodes . When the electrode is damaged, the DH additives promote widespread cracking and debonding, which separates the internal short site from the surrounding AMs.…”
“…For Lithium Nickel Manganese Cobalt Oxide (NMC) AMs, the onset temperature of thermal runaway is around 170 °C . Other TRM methods include shut‐down separators, damage homogenizers, thermal‐runaway retardants, and deformed current collector…”
Thermally sensitive binder (TSB) is developed as an internal safety mechanism of lithium-ion battery (LIB). The TSB is a polymer blend of poly(vinylidene fluoride) (PVDF) and poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP). Compared with regular PVDF binder, the softening and swelling of TSB are more pronounced when temperature is above 110 8C. With the TSB, the cycling performance of LIB cell is not affected; upon nail penetration, the heat generation rate is significantly reduced. The crystallinity of TSB is an important factor. This technology may lead to the development of thermal-runaway-mitigating LIB cells. V C 2017Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45737.
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