Lin Xueyu, Dong Chenlong, Zhao Siwei, Peng Baixin, Zhou Ce, Wang Ruiqi, Huang Fuqiang
Beijing National Laboratory for Molecular Sciences and State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, P. R. China.
State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, P. R. China.
Adv Sci (Weinh). 2022 Aug;9(23):e2202026. doi: 10.1002/advs.202202026. Epub 2022 Jun 17.
High-capacity alloying-type anodes suffer poor rate capability due to their great volume expansion, while high-rate intercalation-type anodes are troubled with low theoretical capacity. Herein, a novel mechanism of alloying in the intercalative frameworks is proposed to confer both high-capacity and high-rate performances on anodes. Taking the indium-vanadium oxide (IVO) as a typical system, alloying-typed In is dispersed in the stable intercalative V O to form a solid solution. The alloying-typed In element provides high lithium storage capacity, while the robust, Li-conductive V-O frameworks effectively alleviate the volume expansion and aggregation of In. Benefiting from the above merits, the anode exhibits a high specific capacity of 1364 mA h g at 1 A g and an extraordinary cyclic performance of 814 mA h g at 10 A g after 600 cycles (124.9 mA h g after 10 000 cycles at 50 A g ). The superior electrochemical rate capability of (In,V) O solid solution anode rivals that of the reported alloying anode materials. This strategy can be extended for fabricating other alloying/intercalation hybrid anodes, such as (Sn,V)O and (Sn,Ti)O , which demonstrates the universality of confining alloying motifs in intercalative frameworks for rapid and high-capacity lithium storage.
高容量合金型阳极由于其巨大的体积膨胀而倍率性能较差，而高倍率嵌入型阳极则受限于低理论容量。在此，我们提出一种在嵌入框架中进行合金化的新机制，以使阳极兼具高容量和高倍率性能。以氧化铟钒（IVO）作为典型体系，合金型铟分散在稳定的嵌入型V₂O₅中形成固溶体。合金型铟元素提供高储锂容量，而坚固的锂导电V-O框架有效缓解了铟的体积膨胀和聚集。受益于上述优点，该阳极在1 A g时表现出1364 mA h g的高比容量，在10 A g下循环600次后具有814 mA h g的优异循环性能（在50 A g下循环10000次后为124.9 mA h g）。(In,V)₂O₅固溶体阳极卓越的电化学倍率性能可与已报道的合金阳极材料相媲美。这种策略可扩展用于制备其他合金/嵌入混合阳极，如(Sn,V)O₂和(Sn,Ti)O₂，这证明了在嵌入框架中限制合金化结构单元以实现快速和高容量锂存储的通用性。
