By Dongfang Yang
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Extra info for Alkali-ion Batteries
This alternately hinders the diffusion of the mediator to the electrode  and contributes to the poor electrochemical performance of the cathode. 5772/62319 Figure 1. Spinel structure showing the MnO6 octahedra and Li 8a tetrahedral positions of LiMn2O4 (a)  with its corre‐ sponding transmission electron microscopy (TEM; b) and SCEM (c) graphs. LiMn2O4 with its poor stability and high rate performance cannot satisfy high-power applica‐ tions. The reason for this may due to HF generated during cycling when using LiPF6-based electrolyte, which is responsible for the dissolution of manganese.
3. Results and discussion The micrographs of pure and modified LiMn2O4 samples are shown in Figure 2. The pure LiMn2O4 (a) appear to have primary particles around 50 nm and have the expected spinel shape. The secondary particles of LiMn2O4 are about 100 nm, which are glomeration congre‐ gated tightly by primary particles, indicating that the crystals of the spinel LiMn2O4 grow well and have interparticle boundaries. 98O4 (b) shows two types of particles with different particle sizes. The larger particles are that of the pristine sample, exemplified by an octahedral shape.
The structure of Li-S batteries Figure 3. The schematic and assembling of CR2025 type button cell. A Li-S cell is an electrochemical storage device through which electrical energy can be stored in sulfur electrodes. As shown in Figure 2, a conventional Li-S cell is composed of sulfur composite as the cathode, lithium metal as the anode, and separated an organic lithium solution as the electrolyte . 5772/62439 electrochemical reaction, then the cathode contains elemental sulfur, conductive carbon, and polymer binder.
Alkali-ion Batteries by Dongfang Yang