Guangzhou Key Laboratory for Surface Chemistry of Energy Materials, New Energy Research Institute, College of Environment and Energy, South China University of Technology, Guangzhou 510006, Guangdong, China.
School of Materials and Chemical Engineering, Ningbo University of Technology, Ningbo 315211, Zhejiang, China.
J Colloid Interface Sci. 2018 Feb 1;511:119-127. doi: 10.1016/j.jcis.2017.09.114. Epub 2017 Sep 30.
A facile template-free Ostwald ripening method is developed for the preparation of the reduced graphene oxide supported splode-like NiCoO hollow 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 at the current density of 100 mA g. The performance of the SNHM/rGO is much higher than that of most NiCoO-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 LiCoO//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 NiCoO microspheres with the reduced graphene oxide integrated.
一种简便的无模板奥斯特瓦尔德熟化方法被开发用于制备还原氧化石墨烯负载爆炸状 NiCoO 空心微球（SNHM/rGO）。发现在反应混合物中使用的氧化石墨烯在 SNHM/rGO 的形成中起着关键作用。它促进了适合奥斯特瓦尔德熟化的 NiCo-甘油微球的形成，从而形成了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 作为锂离子电池的阳极具有很大的应用前景，在 100 mA g 的电流密度下可以稳定地可逆地提供 1048.1 mA h g 的容量。SNHM/rGO 的性能明显高于以前报道的大多数 NiCoO 基材料，这强烈表明 SNHM/rGO 可用于实际应用。LiCoO//SNHM-rGO 全电池的更高性能很好地证明了这一点。优异的电化学性能可归因于 SNHM/rGO 的特殊结构，它包含还原氧化石墨烯集成的爆炸状空心 NiCoO 微球。
