High Volumetric Energy and Power Density Li2TiSiO5 Battery Anodes via Graphene Functionalization
High Volumetric Energy and Power Density Li2TiSiO5 Battery Anodes via Graphene Functionalization
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DOI：
10.1016/j.matt.2020.07.017
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发表时间：
2020-08
期刊：
影响因子：
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通讯作者：
J. Lim;Sungkyu Kim;Norman S. Luu;J. Downing;M. T. Tan;Kyu‐Young Park;Jacob C. Hechter;V. Dravid-V.-Dr
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文献类型：
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作者：
J. Lim;Sungkyu Kim;Norman S. Luu;J. Downing;M. T. Tan;Kyu‐Young Park;Jacob C. Hechter;V. Dravid-V.-Dr
实现高体积能量密度和高倍率最小镀锂的锂离子电池(Lib)阳极仍然是包括电动汽车和网格级储能在内的新兴技术的关键挑战。在这里，我们提出了石墨烯功能化的Li2TiSiO5(G-LTSO)作为LIBS的高体积能量和功率密度的阳极。G-LTSO形成致密的电极结构，具有电子和离子导电网络，具有优异的电化学性能。锂化后，原位电子显微镜显示，石墨烯官能化与原始的LTSO相比，结构变化最小，因此具有较高的循环稳定性。此外，G-LTSO不仅表现出高的充放电容量，而且由于减少了固体-电解质界面的形成，在高倍率下具有低的过电位，电压衰减最小。高度紧凑的电极形态、稳定的高倍率电化学和低工作电位相结合，使G-LTSO能够获得出色的体积能量和功率密度，从而克服了LIBS面临的挑战。
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 situtransmission 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.