Li Guangming, Li Yifan, Zhang Yi, Lei Shuguo, Hou Jiwei, Lu Huiling, Fang Baizeng
CNG Wind Energy Co., Ltd., Beijing 100160, China.
School of Physical and Mathematical Science, Nanjing Tech University, Nanjing 211816, China.
Molecules. 2024 Jun 6;29(11):2704. doi: 10.3390/molecules29112704.
Sodium-ion batteries (SIBs) have received considerable attention in recent years. Anode material is one of the key factors that determine SIBs' electrochemical performance. Current commercial hard carbon anode shows poor rate performance, which greatly limits applications of SIBs. In this study, a novel vanadium-based material, SrVO, was proposed as an anode for SIBs, and its Na storage properties were studied for the first time. To enhance the electrical conductivity of SrVO material, a microflower structure was designed and reduced graphene oxide (rGO) was introduced as a host to support SrVO microflowers. The microflower structure effectively reduced electron diffusion distance, thus enhancing the electrical conductivity of the SrVO material. The rGO showed excellent flexibility and electrical conductivity, which effectively improved the cycling life and rate performance of the SrVO composite material. As a result, the SrVO@rGO composite showed excellent electrochemical performance (a stable capacity of 273.4 mAh g after 200 cycles at 0.2 A g and a high capacity of 120.4 mAh g at 10.0 A g), indicating that SrVO@rGO composite can be an ideal anode material for SIBs.
近年来，钠离子电池（SIBs）受到了广泛关注。负极材料是决定钠离子电池电化学性能的关键因素之一。目前商业化的硬碳负极倍率性能较差，这极大地限制了钠离子电池的应用。在本研究中，一种新型钒基材料SrVO被提出作为钠离子电池的负极，并首次对其储钠性能进行了研究。为提高SrVO材料的电导率，设计了一种微花结构，并引入还原氧化石墨烯（rGO）作为载体来支撑SrVO微花。微花结构有效地缩短了电子扩散距离，从而提高了SrVO材料的电导率。rGO表现出优异的柔韧性和导电性，有效改善了SrVO复合材料的循环寿命和倍率性能。结果表明，SrVO@rGO复合材料表现出优异的电化学性能（在0.2 A g下循环200次后容量稳定在273.4 mAh g，在10.0 A g下具有120.4 mAh g的高容量），表明SrVO@rGO复合材料可以成为钠离子电池理想的负极材料。
