Department of Engineering Science, University of Oxford , Oxford OX1 3PJ, U.K.
Department of Materials Science and Engineering, Seoul National University of Science and Technology , Seoul 139-743, Republic of Korea.
ACS Appl Mater Interfaces. 2016 Jul 13;8(27):17651-8. doi: 10.1021/acsami.6b03866. Epub 2016 Jun 28.
The ability to rationally design and manipulate the interfacial structure in lithium ion batteries (LIBs) is of utmost technological importance for achieving desired performance requirements as it provides synergistic effects to the electrochemical properties and cycling stability of electrode materials. However, despite considerable efforts and progress made in recent years through the interface engineering based on active electrode materials, relatively little attention has been devoted to address the physical aspects of the interface and interfacial layer between the anode materials layer and the current collector. Here, we propose and successfully grow unique graphene directly on a Cu current collector as an ideal interfacial layer using the modified chemical vapor deposition (CVD). The anode with an engineered graphene interlayer exhibits remarkably improved electrochemical performances, such as large reversible specific capacity (921.4 mAh g(-1) at current density of 200 mA g(-1)), excellent Coulombic efficiency (close to approximately 96%), and superior cycling capacity retention and rate properties compared to the bare Cu. These excellent electrochemical features are discussed in terms of multiple beneficial effects of graphene on interfacial stability and adhesion between the anode and the collector, oxidation or corrosion resistance of the graphene grown Cu current collector, and electrical contact conductance during the charge/discharge process.
理性设计和调控锂离子电池（LIBs）界面结构对于实现所需的性能要求至关重要，因为它可以协同影响电极材料的电化学性能和循环稳定性。然而，尽管近年来通过基于活性电极材料的界面工程取得了相当大的进展，但相对较少关注解决阳极材料层与集流器之间界面和界面层的物理方面。在这里，我们提出并成功地使用改良的化学气相沉积（CVD）在 Cu 集流器上直接生长独特的石墨烯作为理想的界面层。具有工程化石墨烯中间层的阳极表现出显著改善的电化学性能，例如大的可逆比容量（在 200mA/g 的电流密度下为 921.4mAh/g）、优异的库仑效率（接近约 96%）以及优于裸 Cu 的循环容量保持率和倍率性能。这些优异的电化学特性是从多个方面讨论的，包括石墨烯对界面稳定性和阳极与集流器之间的附着力、石墨烯生长的 Cu 集流器的抗氧化或耐腐蚀性能以及充放电过程中的电接触电导的有益影响。
