In-situ preparation of silk-cocoon derived carbon and LiFePO4 nanocomposite as cathode material for Li-ion battery

Correlation Between Li‐Fe Anti‐Site and Memory Effect of LiFePO4 in Li‐Ion Batteries

“…Their XRD peaks match with standard LiFePO 4 values (PDF#40‐1499) excellently without any impurity, as shown in Figure 1d, indicating that all samples are crystalized sufficiently. The Raman spectra of three samples have two connected peaks at 1342 cm −1 and 1592 cm −1 , as shown in Figure 1e, corresponding to the D and G bands of carbon, respectively [45–46] . The carbon can enhance the electrical conductivity of as‐synthesized samples, which was derived from the carbonization of sucrose.…”

LiMn0.8Fe0.2PO4/C Nanoparticles via Polystyrene Template Carburizing Enhance the Rate Capability and Capacity Reversibility of Cathode Materials

“…After 200 cycles at 1C, the discharge capacity of CP 1 -LMFP/C is 115.8 mAh g –1 , the capacity retention rate is 95.5%, and the capacity of sample CP 0 -LMFP/C is 81.7 mAh g –1 , with a 86.5% capacity retention. The improvement of electrochemical performance of CP 1 -LMFP/C materials may be attributed to the decomposition of polystyrene microspheres during carbonization, resulting in finer particles and more uniform distribution of carbon coatings, which optimizes the lithium-ion diffusion channel. , Strikingly, the capacity of CP 0 -LMFP/C decreased and fluctuated slightly in the following dozens of cycles and finally stabilized at about 83 mAh g –1 , which may be due to the slight dissolution of the electrode material and the inevitable side reactions during the cycle, which is common in many electrode materials. , In the following cycles, the stability of capacity can be attributed to the gradual thinning and stability of SEI, , while the CP 1 -LMFP/C cycle is relatively stable, which may be benefited from the uniform coating of carbon to reduce the occurrence of side reactions. To investigate the impact of a composite organic carbon source on the material’s electrochemical capabilities, tests were conducted on the electrical properties of SP 0 -LMFP/C and SP 1 -LMFP/C samples.…”

“…14,16 Strikingly, the capacity of CP 0 -LMFP/C decreased and fluctuated slightly in the following dozens of cycles and finally stabilized at about 83 mAh g −1 , which may be due to the slight dissolution of the electrode material and the inevitable side reactions during the cycle, which is common in many electrode materials. 43,44 In the following cycles, the stability of capacity can be attributed to the gradual thinning and stability of SEI, 45,46 while the CP 1 -LMFP/C cycle is relatively stable, which may be benefited from the uniform coating of carbon to reduce the occurrence of side reactions. To investigate the impact of a composite organic carbon source on the material's electrochemical capabilities, tests were conducted on the electrical properties of SP 0 -LMFP/C and SP 1 -LMFP/C samples.…”

Site Selection of Niobium-Doped LiMn0.6Fe0.4PO4 and Effect on Electrochemical Properties

“…And we can also see in (b) that there are two peaks at 716.5 eV and 729.7 eV, the two weak peaks are due to the Fe energy level splitting, which leads to part of the orbital filling of the transition metal ions. [30][31][32][33] The XPS spectrum of Nb 3d is shown in Fig. 4c.…”