4.6 Article

A novel Li4Ti5O12-based high-performance lithium-ion electrode at elevated temperature

Journal

JOURNAL OF MATERIALS CHEMISTRY A
Volume 3, Issue 9, Pages 4938-4944

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ta05660d

Keywords

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Funding

  1. 973 program [2015CB251401, 2014CB239701]
  2. National Natural Science Foundation of China [51102105, 51304183, 21276257]
  3. Strategic Priority Research Program of the Chinese Academy of Sciences [XDA09010103]
  4. Science Fund for Distinguished Young Scholars of Hubei Province [2013CFA023]
  5. Youth Chenguang Project of Science and Technology of Wuhan City [2014070404010206]
  6. Self-determined Research Funds of CCNU from the Colleges' Basic Research and Operation of MOE [CCNU14A02001]

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Destructive gas generation with associated swelling has been the major challenge for the large-scale application of Li4Ti5O12 (LTO)-based lithium-ion batteries (LIBs), especially when the LIBs work at high temperature. Here we report a new kind of Li4Ti5O12-rutile TiO2 (LTO-RTO) hybrid nanowire array electrode that can be cycled at elevated temperatures. After assembling the optimized LTO-RTO hybrid array as the anode and commercial LiCoO2 (LCO) film as the cathode, the obtained lithium-ion full cell exhibits outstanding performance with an ultralong lifetime at 60 degrees C (similar to 83.6% of its initial capacity can be retained at the end of 500 cycles at similar to 2.5 C). Based on comparative experiments, we proposed a reasonable mechanism and, further, provided a reasonable verdict about the gas generation: the H-2 and CO generation from the LTO electrode are significantly associated with the (111) facet. The presence of more LTO (400) planes than (111) ones in the optimized LTO-RTO electrode is the essential reason for long-term cycling at 60 degrees C without gassing. Our work implies that an ability to tune the crystal facet orientation of electrode nanostructures will be meaningful in the practical design of next-generation high-stability LIBs.

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