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首页> 外文期刊>RSC Advances >Fabrication of graphene-encapsulated Na3V2(PO4)3 as high-performance cathode materials for sodium-ion batteries
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Fabrication of graphene-encapsulated Na3V2(PO4)3 as high-performance cathode materials for sodium-ion batteries

机译：将石墨烯 - 包封的Na3v2（PO4）3的制备为钠离子电池的高性能阴极材料

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Na _(3) V _(2) (PO _(4) ) _(3) (NVP) has been in the spotlight as a potential candidate of next generation batteries to overcome the limitation of lithium resources on Earth. Here a thin-layer graphene-encapsulated NVP composite (NVP/G) was synthesized by self-assembly of surface modified NVP and graphene oxide and then followed by reduction to compensate for the intrinsic low electronic conductivity of NVP and strengthen its structure stability. The as-synthesized hybrid composite as a cathode for sodium-ion batteries (SIBs) exhibits excellent high specific capacity and superior rate performance with discharge capacities of 115.2 mA h g ~(?1) at 0.2 C and 70.1 mA h g ~(?1) at 30 C, It also shows an excellent cycling stability with about 86.0% capacity retention at 5 C after 300 cycles. Ex situ X-ray absorption spectroscopy (XAS) characterization confirmes the local geometrical environment around vanadium is highly conserved during the sodiation/desodiation process, associated with an electrochemically active V ~(3+) /V ~(4+) redox couple. Hence the as-prepared hybrid composite can be considered as a promising cathode material for high-rate SIBs, thanks to the effect interface interaction between NVP nanoparticle sand graphene films.
机译：NA _（3）v _（2）（PO _（4））_（3）（NVP）已成为下一代电池的潜在候选者，以克服地球上锂资源的限制。这里通过表面改性的NVP和氧化石墨烯和氧化物的自组装合成薄层石墨烯 - 包封的NVP复合材料（NVP / g），然后减少以补偿NVP的内在低电子导电性并加强其结构稳定性。作为钠离子电池（SIBS）的阴极的AS合成的混合复合材料具有优异的高比容量和优异的速率性能，放电容量为115.2 mA Hg〜（α1），0.2 c和70.1 ma hg〜（α1）在30℃下，它还显示出优异的循环稳定性，在300次循环后5℃下的容量保持约为86.0％。 EX原位X射线吸收光谱（XAS）表征证实钒周围的局部几何环境在加密/退出过程中高度保守，与电化学活性V〜（3+）/ V〜（4+）氧化还原耦合相关。因此，由于NVP纳米粒子砂石墨烯薄膜之间的效果界面相互作用，可以将AS制备的混合复合材料视为高速SIBs的有希望的阴极材料。

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