Degradation mechanism analysis of all-solid-state lithium polymer secondary batteries by using the impedance measurement

Effect of aluminum fluoride coating on the electrochemical and thermal properties of 0.5Li2MnO3·0.5LiNi0.5Co0.2Mn0.3O2 composite material

“…The Nyquist plots for both electrodes present two semicircles, one in the high-tomedium frequency region and the other in the low frequency region. The first semicircle is attributed the resistance of the surface film and the second one is attributed to the charge-transfer resistance [17]. After the Al-F coating, we found that the charge transfer resistance is notably reduced by the Al-F coating.…”

Influence of AlF3 coating on the electrochemical properties of LiFePO4/graphite Li-ion batteries

“…trolyte (R b ). The incline line in the low frequency is associated with the Li-ion diffusion in the LiFePO 4 particles and represents the Warburg impedance (W) [42][43][44]. A simple equivalent circuit model (Fig.…”

“…As a result, the interfacial impedance between the graphite anode and the electrolyte due to the formation of the interfacial film on the graphite anode will be greatly reduced. LiF, probably produced by the reaction of cathode with trace HF and exists in the surface film on the cathode particle [45], is highly resistive to Li + ion transport [42]. AlF 3 coating on the cathode particle will effectively suppress the formation of LiF because AlF 3 is very resistant to HF solution [42].…”

“…LiF, probably produced by the reaction of cathode with trace HF and exists in the surface film on the cathode particle [45], is highly resistive to Li + ion transport [42]. AlF 3 coating on the cathode particle will effectively suppress the formation of LiF because AlF 3 is very resistant to HF solution [42]. Thus the suppression of the formation of LiF can directly inhibit the increase of cathode/electrolyte interfacial impedance.…”

Study of Degradation Processes of Carbon Negative Electrodes for All-solid Lithium Polymer Batteries

“…In order to minimize the safety concerns of the LIBs, all-solid lithium polymer batteries have been widely studied for a long time. [1][2][3][4][5] Originally lithium metal was expected to be the negative electrodes for all-solid lithium polymer batteries. However, it has been reported that the all-solid lithium polymer batteries using lithium negative electrode still have safety problems due to the dendritic growth of the lithium negative electrode during the charge process.…”