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High-capacity anode derived from graphene oxide with lithium-active functional groups
International Journal of Energy Research ( IF 4.3 ) Pub Date : 2021-09-06 , DOI: 10.1002/er.7238 Hae Ri Lee 1 , Yun‐Sik Kim 1 , Youn‐Ki Lee 2, 3 , Sungho Lee 2, 4 , Han‐Ik Joh 1
International Journal of Energy Research ( IF 4.3 ) Pub Date : 2021-09-06 , DOI: 10.1002/er.7238 Hae Ri Lee 1 , Yun‐Sik Kim 1 , Youn‐Ki Lee 2, 3 , Sungho Lee 2, 4 , Han‐Ik Joh 1
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Applications utilizing Li-ion batteries (LIBs) have recently been broadened from portable electronic devices to electric vehicles. Graphite has been applied as an anode material for commercialized LIBs; however, there is a growing demand for application-oriented LIBs with higher energy and power densities, and faster charging, compared with its limited electrochemical properties. Heteroatom-doped graphene has been considered as a potential alternative to graphite, although its synthesis is complex and costly. In this study, we introduced a facile strategy to realize advanced anode materials through fine control of the sheet size and oxygen-containing functional groups on the surface of graphene oxide (GO) as a raw material for heteroatom-doped graphene. The sheet size of GO is inversely proportional to the amount of oxidizing agent, which affects the formation of various types of oxygen-containing functional groups at the edges of GO. Mild annealing of GO selectively removes the functional groups with weak binding strength, leading to the formation of GO maximized with carbonyl groups, which can interact with Li ions quickly and reversibly. The GO with the average sheet size of 500 nm developed in this study exhibits capacities of up to 779 and 220 mAh g−1 at 0.1 and 2 A g−1, respectively. Therefore, decreasing the sheet size of GO with mild-temperature annealing increases the number of carbonyl groups formed on the additional exposed edge of the sheets, resulting in facile Li-ion interaction and a higher capacity as an anode material.
中文翻译：
由具有锂活性官能团的氧化石墨烯衍生的高容量负极
使用锂离子电池 (LIB) 的应用最近已从便携式电子设备扩展到电动汽车。石墨已被用作商业化锂离子电池的负极材料；然而，与其有限的电化学性能相比，对具有更高能量和功率密度以及更快充电的面向应用的LIB的需求不断增长。杂原子掺杂的石墨烯被认为是石墨的潜在替代品，尽管其合成复杂且成本高。在这项研究中，我们介绍了一种简便的策略，通过精细控制作为杂原子掺杂石墨烯原料的氧化石墨烯（GO）表面的片层尺寸和含氧官能团来实现先进的负极材料。GO的片材尺寸与氧化剂的量成反比，这会影响 GO 边缘各种类型的含氧官能团的形成。GO的温和退火选择性地去除了结合强度较弱的官能团，导致GO的形成与羰基最大化，可以与锂离子快速且可逆地相互作用。本研究开发的平均片材尺寸为 500 nm 的 GO 的容量高达 779 和 220 mAh g-1分别在 0.1 和 2 A g -1。因此，通过温和的温度退火减小 GO 的片材尺寸会增加在片材额外暴露边缘上形成的羰基的数量，从而导致容易的锂离子相互作用和更高的负极材料容量。
更新日期：2021-09-06
中文翻译：
由具有锂活性官能团的氧化石墨烯衍生的高容量负极
使用锂离子电池 (LIB) 的应用最近已从便携式电子设备扩展到电动汽车。石墨已被用作商业化锂离子电池的负极材料；然而，与其有限的电化学性能相比，对具有更高能量和功率密度以及更快充电的面向应用的LIB的需求不断增长。杂原子掺杂的石墨烯被认为是石墨的潜在替代品，尽管其合成复杂且成本高。在这项研究中，我们介绍了一种简便的策略，通过精细控制作为杂原子掺杂石墨烯原料的氧化石墨烯（GO）表面的片层尺寸和含氧官能团来实现先进的负极材料。GO的片材尺寸与氧化剂的量成反比，这会影响 GO 边缘各种类型的含氧官能团的形成。GO的温和退火选择性地去除了结合强度较弱的官能团，导致GO的形成与羰基最大化，可以与锂离子快速且可逆地相互作用。本研究开发的平均片材尺寸为 500 nm 的 GO 的容量高达 779 和 220 mAh g-1分别在 0.1 和 2 A g -1。因此，通过温和的温度退火减小 GO 的片材尺寸会增加在片材额外暴露边缘上形成的羰基的数量，从而导致容易的锂离子相互作用和更高的负极材料容量。
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