Lithium difluorophosphate as an additive to improve the low temperature performance of LiNi0.5Co0.2Mn0.3O2/graphite cells

Use of Ce to Reinforce the Interface of Ni‐Rich LiNi0.8Co0.1Mn0.1O2 Cathode Materials for Lithium‐Ion Batteries under High Operating Voltage

“…In addition, the potential dif- is significantly reduced comparedw ith NCM and post-Ce-400, implyingt hat the electrochemical reversibility of Ni-rich materials can be effectively improved after Ce modificationu nder applicable temperature. [54] The embedded graph at the upper right of Figure 8f magnifiest he detail information of the first high-frequency semicircle. [53] Figure 8f shows the resultso fe lectrochemical impedance spectroscopy (EIS) measurements tested after initial charging to 4.5 V. In the equivalent circuit shown in Figure 8f, R s is ascribed to the bulk cell resistance (electrolyte and separator, etc.…”

“…[51] Hence, we can draw the conclusion that the reinforced interface, which results from Ce modification, of Ni-rich cathode materials contributest ot he decreased loss of the H3 phase, thus realizing enhanced cycling stability. [54] The low-fre-quencys traight line represents the Warburg resistance. [52] Sample post-Ce-600 possessest he best repeatability of CV curves after 1cycle and 50 cycles,i ndicating this sample has the lowestp olarization and the most stable layered structure among all samples.…”

“…), R f is ascribed to the resistance of the solid electrolyte interface (SEI) and determinedb yt he diameter of the first semicircle located in the high-frequency region, and R ct is ascribed to the charge-transfer resistancea nd represented by the diameter of the second middle-frequency semicircle. [54] The low-fre-quencys traight line represents the Warburg resistance. [54] The embedded graph at the upper right of Figure 8f magnifiest he detail information of the first high-frequency semicircle.…”

“…[54] The low-fre-quencys traight line represents the Warburg resistance. [54] The embedded graph at the upper right of Figure 8f magnifiest he detail information of the first high-frequency semicircle. The detailedi mpedancep arameters were calculated based on the results of EIS measurements and are shown in Ta ble 2.…”

Low Temperature Characteristics of Hydrogen Storage Alloy LaMm-Ni4.1Al0.3Mn0.4Co0.45 for Ni-MH Batteries

“…For many years, standard lithium-ion batteries have been able to retain only up to ca. 20% of their capacity at −30 • C, but recent optimization of the electrolyte composition enabled the enhancement of the low temperature performance of Li-ion batteries, which can retain up to 60% capacity at −30 • C, albeit with relatively low absolute capacities [13][14][15].…”