Solid-state lithium batteries have the advantages of high energy density and safety, but existing solid-state electrolytes (SSES) cannot meet the stringent requirements of battery operation. 
Figure 1Problems faced by solid-state lithium batteries and comparison of different electrolytes.
Xu Jijing, Jilin UniversityA new type of polyoxometalate SSES (Li3PW12O40 and Li3PMO12O40) was synthesized, which had good interfacial compatibility and chemical stability, and overcame the limitations of traditional SSE. The study shows that by optimizing the three-dimensional Li+ migration network of Li3PW12O40, 0High ionic conductivity of 89 ms cm1 and 0Low activation energy of 23 EV. In addition, Li3PW12O40 has a wide electrochemical stability window and can accommodate both lithium anodes and high-voltage cathodes. 
Figure 2Characterization of Li3PW12O40.
Therefore, Li Li3PW12O40 Lini05co0.2mn0.The cut-off voltage of the all-solid-state lithium metal battery prepared by 3O2 is 4At 35 V, it shows up to 100 stable cycles, a face capacity of more than 4 mAh cm2, and has a $568 kg 1 cost competitiveness. In addition, the Li3PMO12O40 homologous to Li3PW12O40 is obtained by isomorphic substitution, which can form a low-resistance interface with Li3PW12O40. The application of Li3PW12O40 and Li3PMO12O40 in lithium-air batteries further proves that a long cycle life (650 cycles) can be obtained. Overall, this strategy provides a simple, low-cost strategy for constructing efficient and scalable solid-state polyoxooxometalate electrolytes. 
Figure 3li/ li3pw12o40/lini0.5co0.2mn0.3O2 battery performance.
polyoxometalate li3pw12o40 and li3pmo12o40 electrolytes for high-energy all-solid-state lithium batteries. angewandte chemie international edition 2023. doi: 10.1002/anie.202317949