Stable lithium anode enabled by biphasic hybrid SEI layer toward high-performance lithium metal batteries

In Situ Artificial Hybrid SEI Layer Enabled High‐Performance Prelithiated SiOx Anode for Lithium‐Ion Batteries

“…According to EDS line scanning profiles, the thickness of the interface layer is estimated to be ≈80 nm (Figure 2f). From the high-resolution TEM (HRTEM) image, it can be clearly seen the grain with lattice fringes of 0.33 and 0.20 nm, respectively, corresponding to the (200) plane of Li 3 Sb and LiF, [23] which are confirmed by selected area electron diffraction (SAED) patterns (Figure 2g).…”

“…Compared with inhomogeneous surface of Li 3 Sb/LiF-SiO x -1 and porous surface with overgrown spherical particles of Li 3 Sb/LiF-SiO x -5, a relative dense surface with aggregated quasi-spherical cluster can be observed on Li 3 Sb/LiF-SiO x -2, indicating the sufficient mechanical strength to tolerate the volume change (Figure 2b,c; Figure S7, Supporting Information). [18,23] Energy dispersive spectroscopy (EDS) mapping of artificial layer exhibits the uniform distribution of Sb and F elements, which is expected to facilitate even Li + transport through the SEI (Figure S8, Supporting Information). The cross-section SEM images of Li 3 Sb/LiF-SiO x -2 are shown in Figure S9a (Supporting Information).…”

Eutectic Solution Enables Powerful Click Reaction for In‐Situ Construction of Advanced Gel Electrolytes

“…Instead, stronger signals of C-F bonds (F 1s and C 1s), Li 2 CO 3 (C 1s and O 1s) and LiF (F 1s, 684.8 eV) in the DES-related system, which belong to the decomposition of lithium salt, were clearly observed. [41][42][43][44][45] These results indicate the uncoordinated lithium salt in pure DES can be further bound by the polymer network in the GPE system, thus decreasing the side reactions between the electrolyte and the electrode. The B 1s spectrum shown in Figure S8, Supporting Information also confirms a less decomposition of LiDFOB in the PS 1 GPE 80 -assembled lithium surface.…”

A review – exploring the performance degradation mechanisms of LiCoO2 cathodes at high voltage conditions and some optimizing strategies

“…It was believed that the SEI film on the negative electrode surface is produced by the reduction of the electrolyte and the decomposition of the electrolyte salt during the charging and discharging process. [43][44][45] However, the formation mechanism of the SEI film on the surface of the positive electrode material will be different from that of the negative electrode, and the structure and composition will also have significant differences. Besides, the thickness of the SEI film on the surface of the positive electrode material will be thinner than that of the negative electrode material, which also means that the detection of SEI on the cathode is more difficult.…”