期刊
ADVANCED MATERIALS
卷 34, 期 32, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202202688
关键词
fast-charging batteries; graphite; lithium cobalt oxide full cell; intermetallic Cu; Sn-6; (5) networks; lithium-ion batteries; solid-state Li transport
类别
资金
- National Natural Science Foundation of China [U1932213, 51732011, 51571184, 21501165, 21875236, 21573211, 21905264]
- National Basic Research Program of China [2021YFA0715700]
- Anhui Provincial Natural Science Foundation [2008085QB51]
- Hefei National Synchrotron Radiation Laboratory [KY2060000111]
- National Postdoctoral Program for Innovative Talents [BX20180283]
- China Postdoctoral Science Foundation [2019M652206, 2019M663086]
By constructing a LixCu6Sn5 intermetallic network, the speed of lithium-ion transport in liquid electrolytes has been improved, leading to the design of fast-charging lithium-ion batteries.
Superior fast charging is a desirable capability of lithium-ion batteries, which can make electric vehicles a strong competition to traditional fuel vehicles. However, the slow transport of solvated lithium ions in liquid electrolytes is a limiting factor. Here, a LixCu6Sn5 intermetallic network is reported to address this issue. Based on electrochemical analysis and X-ray photoelectron spectroscopy mapping, it is demonstrated that the reported intermetallic network can form a high-speed solid-state lithium transport matrix throughout the electrode, which largely reduces the lithium-ion-concentration polarization effect in the graphite anode. Employing this design, superior fast-charging graphite/lithium cobalt oxide full cells are fabricated and tested under strict electrode conditions. At the charging rate of 6 C, the fabricated full cells show a capacity of 145 mAh g(-1) with an extraordinary capacity retention of 96.6%. In addition, the full cell also exhibits good electrochemical stability at a high charging rate of 2 C over 100 cycles (96.0% of capacity retention) in comparison to traditional graphite-anode-based cells (86.1% of capacity retention). This work presents a new strategy for fast-charging lithium-ion batteries on the basis of high-speed solid-state lithium transport in intermetallic alloy hosts.
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