Aqueous lithium ion batteries (ALIBs) attract wide attentions due to their high safety, low cost and environmental friendliness. The performance of anode material is the limiting step for the wide application of ALIBs. Here, a core-composite-shell structure of Cu_xTi₂(PO₄)₃@Cu/C is rationally designed, synthesized and investigated as a promising anode material for ALIBs. With high electronic and lithium ion conductivity in internal core and external shell simultaneously, the Cu_xTi₂(PO₄)₃@Cu/C anode material shows excellent electrochemical performance. It delivers a specific capacity 135 mA h·g⁻¹ at 10 mA g⁻¹ (the largest value reported), excellent rate behaviors of 95 mA h·g⁻¹ at 2000 mA g⁻¹, as well as long high rate cycling lifetimes (~80% after 900 cycles at 1000 mA g⁻¹). This work not only provides a new anode material for ALIBs, but also proposes a new material structure design strategy and a facile synthesis method for the preparation of other alkali ions battery electrode materials.

锂离子水电池（ALIB）由于其高安全性，低成本和环境友好性而受到广泛关注。阳极材料的性能是ALIB广泛应用的限制步骤。在这里，合理设计，合成和研究了Cu _x Ti ₂（PO ₄）₃ @ Cu / C的核-壳-壳结构，作为有希望的ALIBs阳极材料。Cu _x Ti ₂（PO ₄）₃ @ Cu / C阳极材料同时在内核和外壳中具有很高的电子和锂离子电导率，因此具有出色的电化学性能。在10 mA g时可提供135 mA h·g ^-1的比容量^-1（报告的最大值），在2000 mA g ^-1时具有出色的95 mA h·g ^-1倍率行为，以及长的高倍率循环寿命（在1000 mA g ^-1时900次循环后约80％）。这项工作不仅为ALIBs提供了一种新的负极材料，而且为制备其他碱离子电池电极材料提出了一种新的材料结构设计策略和一种简便的合成方法。