Surface architecture modification of high capacity Li1.2Ni0.2Mn0.6O2 with synergistic conductive polymers LiPPA and PPy for lithium ion batteries

Surface Architecture Design of LiNi0.8Co0.15Al0.05O2 Cathode with Synergistic Organics Encapsulation to Enhance Electrochemical Stability

“…[55] The peak located at about 3407 cm À 1 is the characteristic peak of OÀ H in LiPAA. [39] Some characteristic peaks of LiPAA and KH550 are present in the FTIR spectrum of NCA@PK3 but not in the FTIR spectrum of NCA. All data demonstrate that the NCA@PK3 material contains the chemical functional groups revealed in Scheme 1.…”

“…Therefore, the outer amorphous coating layer of NCA@PK2 plays an important part in reducing the polarization resistance as the amorphous coating layer can maintain the relatively rapid Li + transfer and provide a protective barrier to alleviate the interfacial side reactions and reduce accumulation of highly inactive species on the surface. [39] The cycling performance at high temperatures and the upper cut-off voltages were also investigated to further evaluate the effects of the multifunctional coating layer on NCA cathodes. Cycling performances at a charge/discharge rate of 1 C and 55°in the voltage range of 2.8-4.3 V, and at 25°C in the voltage range of 2.8-4.5 V for the four different electrodes are shown in Figure 6a and b; corresponding results based on Figure 6 are summarized in Table 2.…”

“…The generated LiPAA possesses strong affinitive functional group of lithium carboxylate (À COOLi) and displays favorable film-forming ability, which is beneficial for the formation of a uniform and stable Li + network with high ionic conductivity on the surface of the bulk materials. [39] LiPAA also ensures excellent integrity and mechanical stability for composite electrodes due to its merits of unique adhesion, cohesion, and wetting properties. [40][41][42] Furthermore, in order to provide unique surface protection against the organic electrolyte and construct robust interface of NCA materials, the organic substance 3-aminopropyltriethoxy silane (KH550) is introduced.…”

Intrinsically conducting polymers and their combinations with redox-active molecules for rechargeable battery electrodes: an update

“…With the best material 84% of the electrode's initial capacity were still present after 100 cycles. A mixed uniform coating layer of PPy and lithium polyacrylate on particles of Li 1.2 Ni 0.2 Mn 0.6 O 2 showing both ionic and electronic conductivity protects the active material against corrosion and other superficial side reactions resulting in 88.5% capacity retention after 100 cycles (Mu et al 2019). A combination of PPy and LiNi 1/3 Co 1/3 Mn 1/3 O 2 (it remains open whether the ICP served as host or as coating material) resulted in overall performance improvement in a lithium-ion battery (Zhu et al 2020).…”

Improved Cycling Performance of P2-Na0.67Ni0.33Mn0.67O2 Based on Sn Substitution Combined with Polypyrrole Coating

“…Considering the strong Sn–O bond energy (Sn–O; Δ H 298 = 548 kJ mol –1 ), Sn substitution might stabilize the lattice oxygen without suppressing the high capacity of Na 0.67 Ni 0.33 Mn 0.67 O 2 . Meanwhile, polypyrrole (PPy) has been widely used as the coating layer of electrode materials to improve their electrochemical performance due to its high conductivity, easy preparation, and good stability. − Herein, we combined a Sn substitution strategy with polypyrrole coating to obtain a Na 0.67 Ni 0.33 Mn 0.63 Sn 0.04 O 2 @PPy composite, which showed excellent cycling stability without sacrificing the high working voltage. We found that Sn substitution did not affect the charge compensation mechanism in the wide voltage region.…”