Bulusheva L G, Stolyarova S G, Chuvilin A L, Shubin Yu V, Asanov I P, Sorokin A M, Mel'gunov M S, Zhang Su, Dong Yue, Chen Xiaohong, Song Huaihe, Okotrub A V
Nikolaev Institute of Inorganic Chemistry, Siberian Branch of Russian Academy of Sciences, 3 Acad. Lavrentiev Ave., 630090 Novosibirsk, Russia. Novosibirsk State University, 2 Pirogova Str., 630090 Novosibirsk, Russia.
Nanotechnology. 2018 Apr 3;29(13):134001. doi: 10.1088/1361-6528/aaa99f.
Holes with an average size of 2-5 nm have been created in graphene layers by heating of graphite oxide (GO) in concentrated sulfuric acid followed by annealing in an argon flow. The hot mineral acid acts simultaneously as a defunctionalizing and etching agent, removing a part of oxygen-containing groups and lattice carbon atoms from the layers. Annealing of the holey reduced GO at 800 °C-1000 °C causes a decrease of the content of residual oxygen and the interlayer spacing thus producing thin compact stacks from holey graphene layers. Electrochemical tests of the obtained materials in half-cells showed that the removal of oxygen and creation of basal holes lowers the capacity loss in the first cycle and facilitates intercalation-deintercalation of lithium ions. This was attributed to minimization of electrolyte decomposition reactions, easier desolvation of lithium ions near the hole boundaries and appearance of multiple entrances for the naked ions into graphene stacks.
通过在浓硫酸中加热氧化石墨烯（GO），随后在氩气流中退火，在石墨烯层中形成了平均尺寸为2 - 5纳米的孔洞。热的无机酸同时作为去功能化和蚀刻剂，从层中去除一部分含氧基团和晶格碳原子。在800℃ - 1000℃对多孔还原氧化石墨烯进行退火会导致残余氧含量和层间距降低，从而由多孔石墨烯层产生薄而致密的堆叠结构。在半电池中对所得材料进行的电化学测试表明，氧的去除和基面孔洞的形成降低了第一个循环中的容量损失，并促进了锂离子的嵌入 - 脱嵌。这归因于电解质分解反应的最小化、锂离子在孔洞边界附近更容易去溶剂化以及裸离子进入石墨烯堆叠结构的多个入口的出现。
