Graphene oxide assisted template-free synthesis of nanoscale splode-like NiCo2O4 hollow microsphere with superior lithium storage properties
Graphene oxide assisted template-free synthesis of nanoscale splode-like NiCo2O4 hollow microsphere with superior lithium storage properties
复制标题
氧化石墨烯辅助无模板合成具有优异储锂性能的纳米级爆炸状NiCo2O4空心微球
DOI：
10.1016/j.jcis.2017.09.114
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发表时间：
2017
影响因子：
9.9
通讯作者：
Zhong-Jie Jiang
中科院分区：
文献类型：
--
作者：
Haibo Rong;Zhongqing Jiang;Xiaoning Tian;Yanmin Qin;Si Cheng;Fu Wang;Zhong-Jie Jiang
开发了一种简便的无模板奥斯特瓦尔德熟化方法，用于制备还原氧化石墨烯负载的片状 NiCo2O4 空心微球（SNHM/rGO）。研究发现反应混合物中使用的氧化石墨烯在 SNHM/rGO 的形成中发挥着至关重要的作用。它促进适合奥斯特瓦尔德熟化的NiCo-甘油微球的形成，形成还原氧化石墨烯负载的空心NiCo-甘油微球，这对于随后的煅烧形成SNHM/rGO非常重要。所获得的SNHM/rGO作为锂离子电池负极具有广阔的前景，在100mAg−1的电流密度下可提供1048.1mAhg−1的稳定可逆容量。 SNHM/rGO 的性能远高于之前报道的大多数 NiCo2O4 基材料，强烈表明 SNHM/rGO 可用作实际应用的阳极。 LiCoO2//SNHM−rGO 全电池的更高性能很好地支持了这一点。优异的电化学性能可归因于SNHM/rGO的特殊结构，该结构由片状中空NiCo2O4微球和集成的还原氧化石墨烯组成。
A facile template-free Ostwald ripening method is developed for the preparation of the reduced graphene oxide supported splode-like NiCo2O4hollow microsphere (SNHM/rGO). The graphene oxide used in the reaction mixture is found to play a crucial role in the formation of the SNHM/rGO. It promotes the formation of the NiCo-glycerol microspheres suitable for the Ostwald ripening to form the reduced graphene oxide supported hollow NiCo-glycerol microspheres, which is important for the subsequent calcination to form the SNHM/rGO. The obtained SNHM/rGO shows a great promise as the anode for lithium-ion batteries and can deliver a stable reversible capacity of 1048.1 mA h g−1at the current density of 100 mA g−1. The performance of the SNHM/rGO is much higher than that of most NiCo2O4-based materials reported previously, strongly suggesting that the SNHM/rGO could be used as the anode for practical applications. This is well supported by the higher performance of the LiCoO2//SNHM−rGO full cell. The excellent electrochemical performance can be attributed to the specific structure of the SNHM/rGO, which comprises the splode-like hollow NiCo2O4microspheres with the reduced graphene oxide integrated.