Ti2[Formula: see text][Formula: see text] (TNO) is considered as a potential anode material due to its high capacity/power density and reliable safety. However, its poor electronic conductivity restricts its rate performance, which is important for its application in electric vehicles (EVs). In this study, we fabricated a hybrid of Ti2[Formula: see text][Formula: see text]/holey-reduced graphene oxide (TNOx/HRGO) by a two-step method. In the structure of TNOx/HRGO, TNOx microspheres with oxygen vacancies are wrapped by gossamer-like HRGO. The oxygen vacancies of TNOx and the high conductivity of HRGO can effectively enhance the electronic conductivity of the TNOx/HRGO hybrid, and the HRGO holes are beneficial for the transmission of lithium-ion ([Formula: see text]). The synergy effect of above features improves the rate performance of the TNOx/HRGO hybrid. In addition, the existence of HRGO can buffer volume expansion during the insertion processes of [Formula: see text], which can improve cyclic stability of the TNOx/HRGO hybrid. Consequently, the TNOx/HRGO electrode has excellent lithium-ion storage capacity, with high-rate performance (242[Formula: see text]mAh/g at 10∘C, 225[Formula: see text]mAh/g at 20∘C and 173[Formula: see text]mAh/g at 40∘C) and excellent cyclic stability (98.0% capacity retention after 300 cycles at 10∘C). This work reveals that TNOx/HRGO can be a potential anode material for high-rate-performance lithium-ion storage.

中文翻译：

---

孔洞还原氧化石墨烯包裹的多孔 Ti2Nb10O29−x 微球作为高性能锂离子存储的优质负极材料

钛2[公式：见正文][公式：见正文]（TNO）因其高容量/功率密度和可靠的安全性而被认为是一种潜在的负极材料。然而，其较差的电子导电性限制了其倍率性能，这对于其在电动汽车（EV）中的应用非常重要。在这项研究中，我们制造了一种 Ti 的混合物2[分子式：见正文][分子式：见正文]/holey-reduced graphene oxide (TNOX/HRGO) 采用两步法。在 TNO 的结构中X/HRGO，TNOX具有氧空位的微球被游丝状的 HRGO 包裹。TNO的氧空位XHRGO的高电导率可以有效提高TNO的电子电导率X/HRGO杂化，HRGO空穴​​有利于锂离子的传输（[公式：见正文]）。上述特征的协同作用提高了 TNO 的倍率性能X/HRGO 混合动力车。此外，HRGO的存在可以缓冲[公式：见正文]插入过程中的体积膨胀，从而提高TNO的循环稳定性X/HRGO 混合动力车。因此，TNOX/HRGO电极具有优异的锂离子存储能力，具有高倍率性能（242[公式：见正文]mAh/g at 10∘C、225[公式：见正文]mAh/g at 20∘C和173[公式：见正文]mAh/g at 40∘C) 和出色的循环稳定性（10 次循环 300 次后容量保持率为 98.0%∘C）。这项工作表明，TNOX/HRGO可以成为一种潜在的高性能锂离子存储负极材料。