Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 44, Pages 49607-49616Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c13859
Keywords
vanadium nitride; high areal capacity; all-conductive electrode; thick electrode; free-standing electrode
Funding
- Academy of Sciences large apparatus United Fund of China [U1832187]
- National Nature Science Foundation of China [22071135, 21471091]
- Natural Science Foundation of Shandong Province [ZR2019MEM030]
- Fundamental Research Funds of Shandong University [2018JC022]
- Taishan Scholar Project of Shandong Province
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Nanostructured anode materials have attracted significant attention for lithium-ion batteries (LIBs) due to their high specific capacity. However, their practical application is hindered by the rather low areal capacity in the ultrathin electrode (similar to 1 mg cm(-2)). Herein, we propose a new strategy of an all-conductive electrode to fabricate a flexible and free-standing vanadium nitride@N-doped carbon/graphene (VN@C/G) thick electrode. Due to the free-standing structure and absence of any nonconductive components in the electrode, the obtained thick electrode displays excellent cycling performances. With the high mass loading of 5 mg cm(-2), VN based electrodes achieve a reversible capacity of 2.6 mAh cm(-2) after 200 cycles. Moreover, the all-conductive electrode allows an ultrahigh areal capacity of 7 mAh cm(-2) with a high mass loading of 18.3 mg cm(-2), which is comparable to state-of-the-art graphite anodes (4 mAh cm(-2)). Theoretical calculations prove the metallic conductivity of VN, which allows fast charge transport in the thick electrode. This strategy of fabricating all-conductive electrodes shows great potentials to achieve high areal capacity in practical lithium-ion batteries.
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