Several carbon-coated Ga2O3 anodes: efficient coating of reduced graphene oxide enhanced the electrochemical performance of lithium ion batteries,Dalton Transactions

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Several carbon-coated Ga2O3 anodes: efficient coating of reduced graphene oxide enhanced the electrochemical performance of lithium ion batteries
Dalton Transactions ( IF 3.5 ) Pub Date : 2021-1-30 , DOI: 10.1039/d0dt04009f
Ke Wang _{1,

2,

3,

4} , Wenkai Ye _{1,

2,

3,

4} , Weihao Yin _{1,

2,

3,

4} , Wenwen Chai _{1,

2,

3,

4} , Yichuan Rui _{1,

2,

3,

4} , Bohejin Tang _{1,

2,

3,

4}

Affiliation

Gallium oxide as a novel electrode material has attracted attention because of its high stability and conductivity. In addition, Ga₂O₃ will be converted to Ga during the charge and discharge process, and the self-healing behavior of Ga can improve the cycling stability. In this paper, we synthesized Ga₂O₃ nanoparticles with a size of about 4 nm via a facile sol–gel method. Meanwhile, we employed three types of carbon materials (reduced graphene oxide, mesoporous carbon nanofiber arrays, and carbon nanotubes) to avoid the aggregation of Ga₂O₃ nanoparticles and improve the conductivity of Ga₂O₃ during the discharge/charge process as well. Among the three samples, the deactivating defective sites and special carbon matrix of reduced graphene oxide can provide more attachment points for Ga ions, so the Ga₂O₃ nanoparticles can be more closely and uniformly distributed on rGO. Benefitting from the perfect combination of reduced graphene oxide sheets and Ga₂O₃ nanoparticles, a stable capacity of the Ga₂O₃/rGO electrode can be maintained at 411 mA h g⁻¹ at a current density of 1000 mA g⁻¹ after 600 cycles. We believe that this work provides a novel and efficient way to improve the electrochemical stability of Li-ion batteries.

中文翻译：

几个碳包覆的Ga2O3阳极：高效还原氧化石墨烯的包覆增强了锂离子电池的电化学性能

氧化镓作为新型电极材料因其高稳定性和导电性而备受关注。另外，在充放电过程中，Ga ₂ O ₃将转化为Ga，并且Ga的自愈行为可以提高循环稳定性。在本文中，我们通过简便的溶胶-凝胶法合成了尺寸约为4 nm的Ga ₂ O ₃纳米颗粒。同时，我们采用了三种类型的碳材料（氧化石墨烯，中孔碳纳米纤维阵列和碳纳米管）来避免Ga ₂ O ₃纳米粒子的聚集并提高Ga ₂ O ₃的电导率。在放电/充电过程中也是如此。在这三个样品中，还原性氧化石墨烯的失活缺陷位点和特殊碳基质可以为Ga离子提供更多的附着点，因此Ga ₂ O ₃纳米颗粒可以更紧密和均匀地分布在rGO上。从还原氧化石墨烯片的完美结合和Ga受益₂ ö _3个纳米颗粒，稳定的容量中的Ga ₂ ö ₃ / RGO电极可以维持在411毫安汞柱^-1处的千毫安g的电流密度^-1 600后周期。我们相信这项工作提供了一种新颖有效的方法来改善锂离子电池的电化学稳定性。

更新日期：2021-02-25

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