Anode materials based on lithium titanate (LTO)/graphene composites are considered as ideal candidates for high-rate lithium-ion batteries (LIBs). Considering the blocking effects of graphene nanosheets in electrodes during ion-transfer processes, construction of LTO/graphene composite structures with enhanced electrical and ionic conductivity via facile and scalable techniques is still challenging for high-rate LIB. In this work, structures of anode materials based on LTO nanoplates embedded with graphene quantum dots (GQDs) are demonstrated for high-rate LIB. The hybrids can be facilely prepared via in situ introduction of GQDs during the process LTO preparation, which enables a uniform dispersion of GQDs within LTO. This method is convenient, rapid, and can be easily scaled-up. The introduction of 0.05 wt.% GQDs can greatly enhance the electrochemical performance of the electrodes. The electrodes with 0.05 wt.% GQDs deliver a specific discharge capacity of 185, 181 and 179 mAh g⁻¹ at 5, 10, and 20 C, respectively. The performance enhancement is suggested to be due to the synergistic interactions between LTO and GQDs. The strategy as well as as-designed structures of LTO/GQDs show potentials for application as high-rate anode materials in LIBs application.

基于钛酸锂（LTO）/石墨烯复合材料的负极材料被认为是高倍率锂离子电池（LIB）的理想候选材料。考虑到石墨烯纳米片在离子转移过程中在电极中的阻挡效应，通过简便和可扩展的技术构建具有增强的电导率和离子电导率的 LTO/石墨烯复合结构对于高速率 LIB 仍然具有挑战性。在这项工作中，基于嵌入石墨烯量子点（GQD）的 LTO 纳米板的阳极材料结构被证明用于高速率 LIB。杂交体可以通过原位轻松制备在 LTO 制备过程中引入 GQD，从而使 GQD 在 LTO 中均匀分散。这种方法方便、快速，并且可以很容易地扩大规模。0.05 wt.% GQDs 的引入可以大大提高电极的电化学性能。具有 0.05 wt.% GQD 的电极在 5、10 和 20 C 下分别提供 185、181 和 179 mAh g ^-1的比放电容量。性能增强被认为是由于 LTO 和 GQD 之间的协同相互作用。LTO/GQDs 的策略和设计结构显示出在 LIBs 应用中作为高倍率负极材料的潜力。