Effect of CO2 on Layered Li1+zNi1-x-yCoxMyO2 (M=Al,Mn) Cathode Materials

Abstract

We investigated the effect of CO 2 on Li 1+z Ni 1-x-y Co x M y O 2 (M = Al, Mn) cathode materials which were synthesized by spray drying method. The change of CO 2 absorptivity associated with composition were closely related the electrochemical performance. CO 2 absorptivity was very high for Li

Electrochemical Degradation Mechanism and Thermal Behaviors of the Stored LiNi0.5Co0.2Mn0.3O2 Cathode Materials

“…The relation between the weight increasing rate of NCM523 and storage time has also been fitted and presented in Figure S1 accompanied with that of NCM622. Obviously, the NCM523 exhibits a great storage tolerance against the extreme environmental condition with fewer weight increase compared with the NCM622, and it is believed that the Ni 3+ in NCM makes the material more vulnerable against the attacking from the moisture and the carbon dioxide in air. − The FT-IR spectra are shown in Figure b. Newly emerging peaks at 1435 and 1496 cm –1 are ascribed to the Li 2 CO 3 , and absorption peak located at 865 cm –1 is derived from the CO 3 group. , In addition, the broad bands from 3200 to 3600 cm –1 are believed to be derived from LiOH after storage .…”

The role of nanoscale-range vanadium treatment in LiNi0.8Co0.15Al0.05O2 cathode materials for Li-ion batteries at elevated temperatures

“…Accordingly, the LiNi 0.8 Co 0.15 Al 0.05 O 2 material shows poor cycle retention, especially at 60 C, and results in violent exothermic reactions with the electrolytes above 200 C. In addition, this material exhibits a higher absorption of CO 2 than LiNi 1/3 Co 1/3 Mn 1/3 O 2 . 10 In order to improve the electrochemical properties and thermal stability of the cathode, surface treatments such as coating and doping have been proposed, [11][12][13][14][15][16][17][18] together with the use of core-shell materials. 19,20 Generally, surface-coating materials such as metal oxides, uorides, and phosphates are used to protect the surface from hydrouoric acid (HF) attack and other side reactions between the cathode materials and the electrolyte.…”

Beneficial Role of Inherently Formed Residual Lithium Compounds on the Surface of Ni-Rich Cathode Materials for All-Solid-State Batteries

“…However, the improved lithiation capacity is lower than the P-NCM because the formation of the Li 2 CO 3 compound generates surface fatigue of the NCM by the deficient Li-layer formation from the chemical reaction of the NCM with CO 2 gas. 47 The ex situ XPS O 1s spectrum was compared to verify the interfacial degradation during the initial charge, which confirms that the formation of sulfates/phosphates was suppressed for air-exposed W-NCM (Figure 3c). Thus, the identical surface passivation effect derived from the Li 2 CO 3 formation on the NCM surface is equivalent.…”

“…The charge–discharge curves of the W-NCM before and after air exposure showed the polarization was suppressed after air exposure, and charge and discharge capacities were recovered as the result (Figure b). However, the improved lithiation capacity is lower than the P-NCM because the formation of the Li 2 CO 3 compound generates surface fatigue of the NCM by the deficient Li-layer formation from the chemical reaction of the NCM with CO 2 gas . The ex situ XPS O 1s spectrum was compared to verify the interfacial degradation during the initial charge, which confirms that the formation of sulfates/phosphates was suppressed for air-exposed W-NCM (Figure c).…”