Department of Energy Science, Sungkyunkwan University (SKKU) , Suwon, Gyunggido 16419, Republic of Korea.
Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS) , Suwon, Gyunggido 16419, Republic of Korea.
ACS Appl Mater Interfaces. 2017 Jun 7;9(22):18720-18729. doi: 10.1021/acsami.7b02654. Epub 2017 May 25.
The encapsulation of Ni-rich cathode materials (LiNiCoMnO) for lithium ion batteries in reduced graphene oxide (rGO) sheets is introduced to improve electrochemical performances. Using (3-aminopropyl)triethoxysilane, the active materials are completely wrapped with several rGO layers of ∼2 nm thickness. By virtue of the great electrical conductivity of graphene, the rGO-coated cathode materials exhibit much enhanced electrochemical performances of cycling property and rate capability. In addition, it is shown that the structural degradation of the active materials, which is from the rhombohedral layered structure (R3̅m) to the spinel (Fd3̅m) or rock-salt phase (Fm3̅m), is significantly reduced as well as delayed due to the protection of the active materials in the rGO layers from direct contact with electrolytes and the consequent suppression of side reactions.
将富镍正极材料（LiNiCoMnO）封装在还原氧化石墨烯（rGO）片内，以改善锂离子电池的电化学性能。使用（3-氨丙基）三乙氧基硅烷，活性材料完全被几层厚度约为 2nm 的 rGO 包裹。由于石墨烯的高导电性，rGO 包覆的正极材料表现出增强的电化学循环性能和倍率性能。此外，研究表明，活性材料的结构退化，从菱方层状结构（R3̅m）到尖晶石（Fd3̅m）或岩盐相（Fm3̅m），由于活性材料在 rGO 层内受到保护，与电解质直接接触，并抑制副反应，从而显著减缓。
