RESUMO
Silicon (Si) has garnered significant interest as a potential anode material for next-generation lithium-ion batteries due to its high theoretical capacity. However, Si anodes suffer from substantial volume expansion during the charge and discharge processes, which severely undermines their cycling stability. To address this issue, developing novel binders has become an effective strategy to suppress the volume expansion of Si anodes. In this study, a multifunctional polymer binder (DCCS) was designed by the cross-linking of dialdehyde cellulose nanocrystal (DACNC) and carboxymethyl chitosan (CMCS), which forms a 3D network structure via Schiff-base bonds. The DCCS binder with abundant chemical and hydroxyl bonds shows strong adhesion between Si nanoparticles and current collectors, thus enhancing the mechanical properties of the electrode. Furthermore, the DACNC also served as the protecting buffer layer to release the inner stress and stabilize the solid electrolyte interface (SEI). At 4 A g-1, the resulting Si@25%DCCS electrode demonstrated a capacity of 1637 mAh g-1 after 500 cycles, with an average capacity fading rate of 0.07% per cycle. Therefore, this multifunctional binder is considered a promising binder for high-performance Si anodes.
RESUMO
Based on the PI3K/Akt signaling pathway, this study aimed to observe the proliferation and apoptosis of ovarian cancer SKOV3 cells at different concentrations of icaritin, in order to explore the possible molecular mechanisms. The research object was ovarian cancer SKOV3 cells. The cells were divided into the control group and icaritin groups(5, 10, 20 µmol·L~(-1)), and administrated with drugs for 48 hours. The cell counting kit-8(CCK-8)assay was used to detect the inhibitory effect of icaritin on the proliferation of ovarian cancer SKOV3 cells. The proliferation ability of the SKOV3 cells was detected by EdU assay. Hoechst 33342 fluorescence staining was used to observe the apoptotic morphology of SKOV3 cells in each group. The distribution of cell cycle and the apoptosis rate of each group were detected by flow cytometry. Quantitative Real-time PCR was used to detect mRNA expressions of PTEN, PI3K, Akt in each group of cells. Protein expressions of PTEN, PI3K, Akt and p-Akt were measured by Western blot. The results showed that the cell inhibition rates of icaritin groups were significantly increased compared with the control group(P<0.05). The rates of EdU-positive cells of icaritin groups were significantly decreased(P<0.05). SKOV3 cells in icaritin groups showed morphological changes of apoptosis. Apoptosis rates of icaritin groups were significantly increased(P<0.05). The proportions of cells in G_0/G_1 phase of icaritin groups were decreased(P<0.05), while the proportions of S phase cells were increased(P<0.05). The gene and protein expressions of PTEN in icaritin groups were elevated(P<0.05). The gene expressions of PI3K and Akt in icaritin groups were down-regulated(P<0.05). The protein expression of PI3K and p-Akt in icaritin groups were reduced(P<0.05). These results indicated that icarin may inhibit the proliferation of ovarian cancer SKOV3 cells in vitro, induce cell apoptosis and affect the cycle distribution of cells by inhibiting the PI3K/Akt signaling pathway.