The realization of lithium-ion battery (LIB) anodes with high volumetric energy densities and minimal Li plating at high rates remains a key challenge for emerging technologies, including electric vehicles and grid-level energy storage. Here, we present graphene-functionalized Li₂TiSiO₅ (G-LTSO) as a high volumetric energy and power density anode for LIBs. G-LTSO forms a dense electrode structure with electronically and ionically conductive networks that deliver superior electrochemical performance. Upon lithiation, in situ transmission electron microscopy reveals that graphene functionalization yields minimal structural changes compared with pristine LTSO, resulting in high cycling stability. Furthermore, G-LTSO exhibits not only high charge and discharge capacities but also low overpotentials at high rates with minimal voltage fading due to reduced formation of a solid-electrolyte interphase. The combination of highly compacted electrode morphology, stable high-rate electrochemistry, and low operating potential enables G-LTSO to achieve exceptional volumetric energy and power densities that overcome incumbent challenges for LIBs.

具有高体积能量密度和高速率最小化Li电镀的锂离子电池（LIB）阳极的实现仍然是新兴技术（包括电动汽车和电网级储能）的关键挑战。在这里，我们提出了石墨烯官能化的Li ₂ TiSiO ₅（G-LTSO）作为LIBs的高体积能和功率密度阳极。G-LTSO形成具有电子和离子导电网络的致密电极结构，可提供出色的电化学性能。锂化后，原位透射电子显微镜显示，与原始LTSO相比，石墨烯功能化产生的结构变化最小，从而具有很高的循环稳定性。此外，由于减少了固体电解质中间相的形成，G-LTSO不仅显示出高充电和放电容量，而且还显示出高速率下的低过电势，且电压衰减最小。高度紧凑的电极形态，稳定的高速率电化学和低操作电势的结合使G-LTSO能够获得出色的体积能量和功率密度，从而克服了LIB面临的挑战。