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Title: Elucidating the Limit of Li Insertion into the Spinel Li4Ti5O12

Journal Article · · ACS Materials Letters
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  1. Univ. of California, San Diego, CA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Univ. of California, Irvine, CA (United States)
  5. Brookhaven National Lab. (BNL), Upton, NY (United States)
+ Show Author Affiliations

© 2019 American Chemical Society. In this work, we show that the well-known lithium-ion anode material, Li4Ti5O12, exhibits exceptionally high initial capacity of 310 mAh g-1 when it is discharged to 0.01 V. It maintains a reversible capacity of 230 mAh g-1, far exceeding the "theoretical" capacity of 175 mAh g-1 when this anode is lithiated to the composition Li7Ti5O12. Neutron diffraction analyses identify that additional Li reversibly enters into the Li7Ti5O12 to form Li8Ti5O12. density functional theory (DFT) calculations reveal the average potentials of the Li4Ti5O12 to Li7Ti5O12 step and the Li7Ti5O12 to Li8Ti5O12 step are 1.57 and 0.19 V, respectively, which are in excellent agreement with experimental results. Transmission electron microscopy (TEM) studies confirm that the irreversible capacity of Li4Ti5O12 during its first cycle originates from the formation of a solid electrolyte interface (SEI) layer. This work clarifies the fundamental lithiation mechanism of the Li4Ti5O12, when lithiated to 0.01 V vs Li.

Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
AC05-00OR22725; SC0012704
OSTI ID:
1529890
Alternate ID(s):
OSTI ID: 1606681; OSTI ID: 1630612
Report Number(s):
BNL-211805-2019-JAAM
Journal Information:
ACS Materials Letters, Vol. 1, Issue 1; ISSN 2639-4979
Publisher:
ACS PublicationsCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (2)

Solvent-controlled solid-electrolyte interphase layer composition of a high performance Li 4 Ti 5 O 12 anode for Na-ion battery applications journal January 2019
A novel all-fiber-based LiFePO 4 /Li 4 Ti 5 O 12 battery with self-standing nanofiber membrane electrodes journal January 2019

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