Journal
JOURNAL OF ENERGY STORAGE
Volume 67, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.est.2023.107582
Keywords
Silicon; carbon anode; Vertical graphene sheets; Porous structure; lithium-ion batteries
Categories
Ask authors/readers for more resources
Si/C anode with homogeneously deposited Si-C nanolayers on graphite armored with N-doped porous flexible vertical graphene sheets (VGSs) exhibits improved cycling stability and fast-charging capability. Si-C nanolayers contain sub-nanometer Si particles in 3D carbon skeleton, effectively alleviating volume change of Si and accelerating electron and Li-ion transport. N-doped VGSs provide rational space for Si volume change, buffer stress, increase electrical contact points, and accelerate Li-ion transport.
Silicon/carbon (Si/C) anodes have been successfully used in commercial lithium-ion batteries because of their high capacity and excellent safety. Nevertheless, their cycling stability and fast-charging capability are still unsatisfactory due to large volume expansion and slow charge transport capability under industrial electrode conditions. Here, we fabricate a Si/C anode via homogeneously depositing amorphous Si-C nanolayers on graphite armored with N-doped porous flexible vertical graphene sheets (VGSs) (named as Si-C/VGSs/graphite). Si-C nanolayers consist of homogeneously dispersed sub-nanometer Si particles in 3D carbon skeleton, which effectively alleviate the volume change of Si, and hugely accelerate electron and Li-ion transport. The N-doped VGSs possess porous structure, good flexibility, numerous exposed edges, and directional ion transport channels, which provide rational space for accommodating volume change of Si, buffer the stress caused by the volume change, increase the electrical contact points between Si-C/VGSs/graphite, and accelerate Li-ion transport, respectively. Consequently, Si-C/VGSs/graphite delivers superior rate capacity and long cycle life under industrial electrode conditions. When matched with the cathode of Li[Ni0.8Co0.1Mn0.1]O2, the full cell demonstrates a predominant fast-charging capability (180.8 Wh kg-1, charging for 8.2 min, 5C) accompanied by long cycle life.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available