Germanium-based ternary oxides have aroused wide attention as an anode for high-performance lithium-ion batteries (LIBs). Nevertheless, they usually suffer a large volume expansion and rapid capacity fading during lithiation/delithiation cycles. To address this issue, herein, Zn₂GeO₄/RGO composites are synthesized with Zn₂GeO₄ hollow rods in-situ grown on reduced graphene oxide (RGO) sheets. The Zn₂GeO₄ hollow rods can be facilely adjusted from nano- to micro-size. The lithium storage performances of the composites strongly depend on the size of Zn₂GeO₄ hollow rods and the content of RGO. The optimized Zn₂GeO₄/RGO composite exhibits a pseudocapacitance-dominated Li⁺ storage performance, with a large reversible capacity of 1005 mAh g⁻¹ after 100 cycles at 0.5 A g⁻¹, an excellent rate capability (515 mAh g⁻¹ at a high rate of 5 A g⁻¹) and a good long cycling stability of 500 cycles with a low capacity loss of 0.05% per cycle at 1 A g⁻¹. The outstanding electrochemical performance can be attributed to the unique composition and microstructure of the material as well as the synergistic effect of the conductive RGO sheets and the hollow Zn₂GeO₄ nanostructure. This work provides a promising anode for high-performance LIBs and a useful inspiration for further improving the Ge-based ternary oxide anodes.

锗基三元氧化物作为高性能锂离子电池（LIB）的阳极已引起广泛关注。然而，它们通常在锂化/脱锂循环中遭受大体积膨胀和快速容量衰减。为了解决这个问题，在本文中，使用Zn ₂ GeO ₄空心棒原位生长在还原的氧化石墨烯（RGO）片上来合成Zn ₂ GeO ₄ / RGO复合材料。可以方便地将Zn ₂ GeO ₄空心棒从纳米尺寸调整为微米尺寸。复合材料的储锂性能在很大程度上取决于Zn ₂ GeO ₄空心棒的尺寸和RGO的含量。优化锌₂的GeO ₄ / RGO复合材料显示出假电容主导栗⁺存储性能，具有1005毫安g的大可逆容量^-1后100次循环以0.5A克^-1，一个优异的倍率性能（515毫安克^-1以高速率为5 A g ^-1）和500个循环的良好长循环稳定性，在1 A g ^-1时每个循环的容量损失低至0.05％。出色的电化学性能可归因于材料的独特组成和微观结构，以及导电RGO板和中空Zn ₂ GeO ₄的协同作用纳米结构。这项工作为高性能LIB提供了有希望的阳极，并为进一步改善Ge基三元氧化物阳极提供了有益的启示。