Direct Growth of MoO2/Reduced Graphene Oxide Hollow Sphere Composites as Advanced Anode Materials for Potassium‐Ion Batteries,ChemSusChem

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Direct Growth of MoO2/Reduced Graphene Oxide Hollow Sphere Composites as Advanced Anode Materials for Potassium‐Ion Batteries
ChemSusChem ( IF 7.5 ) Pub Date : 2019-01-29 , DOI: 10.1002/cssc.201802494
Cailing Liu _{1,

2} , Shaohua Luo _{2,

3,

4} , Hongbo Huang _{1,

2} , Yuchun Zhai ₃ , Zhaowen Wang ₁

Affiliation

Hollow MoO₂/reduced graphene oxide (MoO₂/rGO) sub‐microsphere composites have been fabricated through a simple hydrothermal approach followed by a heat treatment process. When employed as an anode material for potassium‐ion batteries, the as‐synthesized MoO₂/rGO composite can deliver an initial charge specific capacity of 367.2 mAh g⁻¹ at 50 mA g⁻¹, and its reversible capacity is 218.9 mAh g⁻¹ after 200 cycles. Even when cycled at 500 mA g⁻¹, a high charge specific capacity of 104.2 mAh g⁻¹ is achieved after 500 cycles. The excellent cycling capability and rate performance may be ascribed to the synergistic effects of the reduced graphene oxide and the hollow MoO₂ spheres, which can increase the electrical conductivity of the composite, as well as resisting the strain arising from the repeated discharge–charge processes. These results indicate that the MoO₂/rGO hollow sphere composites are promising negative electrode materials for potassium‐ion batteries.

中文翻译：

MoO2 /还原氧化石墨烯空心球复合材料的直接生长作为钾离子电池的高级阳极材料

中空的MoO ₂ /氧化石墨烯（MoO ₂ / rGO）亚微球复合材料是通过简单的水热方法和热处理工艺制成的。当作为负极材料用于钾离子电池，所合成的MoO ₂ / RGO复合材料可提供的367.2毫安g的初始充电比容量^-1在50mA克^-1，其可逆容量是218.9毫安克^- 200个循环后为¹。即使以500 mA g ^-1循环，其高充电比容量仍为104.2 mAh g ^-1在500个循环后达到。优异的循环能力和倍率性能可能归因于还原的氧化石墨烯和空心MoO ₂球的协同作用，这可以增加复合材料的电导率，并抵抗重复的放电-充电过程产生的应变。这些结果表明，MoO ₂ / rGO中空球复合材料是有前途的钾离子电池负极材料。

更新日期：2019-01-29

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