Journal
ACS APPLIED ENERGY MATERIALS
Volume 1, Issue 11, Pages 6352-6360Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.8b01304
Keywords
hierarchical Li4Ti5O12 nanosheets; single CNT coated; EELS; ultrastable; anode material; lithium ionic battery
Funding
- Ministry of Science and Technology of China [2018YFA0209102]
- National Natural Science Foundation of China [11727807, 51725101, 51672050, 61790581]
- Science and Technology Commission of Shanghai Municipality [16DZ2260600]
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Hierarchical ultrathin lithium titanate (LTO) nanosheets were in situ synthesized inside the carbon nanotubes via a precursor morphology -controlled conversion strategy, which achieves good rate capacity and cycling stability, since it possesses more lithium-insertion channels and good electronic conductivity simultaneously. The as prepared CNT@LTO materials exhibit a high specific capacity of 172.5 mA h g(-1) at 10 C and long cycling stability with only 0.014% capacity loss per cycle. Ex situ electron energy loss spectroscopy (EELS) analysis of CNT@LTO materials at three different stages verifies that during the charge-discharge process only a fraction of the Ti4+ species are reduced to Ti3+ and the specific electrode reaction of spinel LTO occurs from spinel phase to rock-salt phase. Compared with pure LTO, CNT@LTO exhibits a more stable cycle performance and better electronic conductivity, which demonstrate that the CNTs not only provide good conductivity but also maintain structural stability.
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