Major breakthrough in next-generation solid-state lithium battery research

　　Current mainstream lithium batteries use liquid electrolytes, which pose safety risks such as fires, and the energy that can be stored in a specific volume is limited. However, the next generation of solid-state lithium batteries that can solve these problems still has many unsolved problems. Replacing the organic liquid electrolyte in traditional lithium-ion batteries with solid electrolytes can greatly alleviate safety issues and is expected to break through the "glass ceiling" of energy density. However, mainstream electrode materials are also solid substances. Since the contact between two solid substances is almost impossible to be as full as solid-liquid contact, it is difficult for batteries using solid electrolytes to achieve good electrode-electrolyte contact, and the overall performance of the battery is also not good. Satisfactory.

　　Ma Cheng's team and their collaborators conducted atomic-level observations of the impurity phase in a solid-state electrolyte with a classic perovskite structure. Although the structures of the impurities and the solid-state electrolyte were very different, the researchers observed that their atoms interacted with each other at the interface. Extensional formal arrangement. After a series of detailed structural and chemical analyses, the researchers found that this impurity phase has the same structure as the high-capacity lithium-rich layered electrode.

　　Using the observation results, the researchers crystallized amorphous powder with the same composition as the perovskite solid electrolyte on the surface of the lithium-rich layered particles, and successfully achieved sufficient and tight contact between the two solid-state materials in the new composite electrode. touch. The electrode-electrolyte contact problem is solved, and the rate performance of this solid-solid composite electrode is comparable to that of the solid-liquid composite electrode. More importantly, the researchers also found that this epitaxial solid-solid contact can tolerate large lattice mismatches, so their proposed strategy can be applied to a variety of perovskite solid-state electrolytes and layered electrodes.

　　Major breakthrough in next-generation 18650 lithium ion battery research

　　Current mainstream lithium batteries use liquid electrolytes, which pose safety risks such as fires, and the energy that can be stored in a specific volume is limited. However, the next generation of solid-state lithium batteries that can solve these problems still has many unsolved problems. Replacing the organic liquid electrolyte in traditional lithium-ion batteries with solid electrolytes can greatly alleviate safety issues and is expected to break through the "glass ceiling" of energy density. However, mainstream electrode materials are also solid substances. Since the contact between two solid substances is almost impossible to be as full as solid-liquid contact, it is difficult for batteries using solid electrolytes to achieve good electrode-electrolyte contact, and the overall performance of the battery is also not good. Satisfactory.

　　Ma Cheng's team and their collaborators conducted atomic-level observations of the impurity phase in a solid-state electrolyte with a classic perovskite structure. Although the structures of the impurities and the solid-state electrolyte were very different, the researchers observed that their atoms interacted with each other at the interface. Extensional formal arrangement. After a series of detailed structural and chemical analyses, the researchers found that this impurity phase has the same structure as the high-capacity lithium-rich layered electrode.

　　Using the observation results, the researchers crystallized amorphous powder with the same composition as the perovskite solid electrolyte on the surface of the lithium-rich layered particles, and successfully achieved sufficient and tight contact between the two solid-state materials in the new composite electrode. touch. The electrode-electrolyte contact problem is solved, and the rate performance of this solid-solid composite electrode is comparable to that of the solid-liquid composite electrode. More importantly, the researchers also found that this epitaxial solid-solid contact can tolerate large lattice mismatches, so their proposed strategy can be applied to a variety of perovskite solid-state electrolytes and layered electrodes.

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