A nanocomposite polyoxomolybdate (PMo₁₂)–polypyrrole (PPy)/reduced graphene oxide (RGO) is fabricated by using a simple one-pot hydrothermal method as an electrode material for lithium-ion batteries. This facile strategy skillfully ensures that individual polyoxometalate (POM) molecules are uniformly immobilized on the RGO surfaces because of the wrapping of polypyrrole (PPy), which avoids the desorption and dissolution of POMs during cycling. The unique architecture endows the PMo₁₂–PPy/RGO with the lithium storage behavior of a hybrid battery–supercapacitor electrode: the nanocomposite with a lithium storage capacity delivers up to 1000 mAh g^–1 at 100 mA g^–1 after 50 cycles. Moreover, it still demonstrates an outstanding rate capability and a long cycle life (372.4 mAh g^–1 at 2 A g^–1 after 400 cycles). The reversible capacity of this nanocomposite has surpassed most pristine POMs and POMs-based electrode materials reported to date.

中文翻译：

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聚氧钼酸-聚吡咯/还原氧化石墨烯纳米复合材料作为高容量锂存储电极

通过使用简单的一锅水热法作为锂离子电池的电极材料，制备了纳米复合材料的聚钼钼酸盐（PMo ₁₂）-聚吡咯（PPy）/氧化石墨烯（RGO）。这种简便的策略巧妙地确保了由于聚吡咯（PPy）的包裹而使各个多金属氧酸盐（POM）分子均匀地固定在RGO表面上，避免了POM在循环过程中的解吸和溶解。独特的架构赋予了PMO ₁₂ -PPy / RGO与混合动力电池超级电容器电极的锂存储行为：用锂存储容量的纳米复合提供高达1000毫安克^-1在100mA克^-150个周期后。此外，它仍然显示出出色的速率能力和较长的循环寿命（400次循环后，在2 A g ^–1下为372.4 mAh g ^–1）。这种纳米复合材料的可逆容量已经超过了迄今为止报道的大多数原始POM和基于POM的电极材料。