Lithium titanate hydrates with superfast and stable cycling in lithium ion batteries

Shitong Wang, Wei Quan, Zhi Zhu, Yong Yang, Qi Liu, Yang Ren, Xiaoyi Zhang, Rui Xu, Ye Hong, Zhongtai Zhang, Khalil Amine, Zilong Tang (), Jun Lu () and Ju Li ()
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Shitong Wang: Tsinghua University
Wei Quan: Tsinghua University
Zhi Zhu: Massachusetts Institute of Technology
Yong Yang: Tsinghua University
Qi Liu: Argonne National Laboratory
Yang Ren: Argonne National Laboratory
Xiaoyi Zhang: Argonne National Laboratory
Rui Xu: Argonne National Laboratory
Ye Hong: Tsinghua University
Zhongtai Zhang: Tsinghua University
Khalil Amine: Argonne National Laboratory
Zilong Tang: Tsinghua University
Jun Lu: Argonne National Laboratory
Ju Li: Massachusetts Institute of Technology

Nature Communications, 2017, vol. 8, issue 1, 1-8

Abstract: Abstract Lithium titanate and titanium dioxide are two best-known high-performance electrodes that can cycle around 10,000 times in aprotic lithium ion electrolytes. Here we show there exists more lithium titanate hydrates with superfast and stable cycling. That is, water promotes structural diversity and nanostructuring of compounds, but does not necessarily degrade electrochemical cycling stability or performance in aprotic electrolytes. As a lithium ion battery anode, our multi-phase lithium titanate hydrates show a specific capacity of about 130 mA h g−1 at ~35 C (fully charged within ~100 s) and sustain more than 10,000 cycles with capacity fade of only 0.001% per cycle. In situ synchrotron diffraction reveals no 2-phase transformations, but a single solid-solution behavior during battery cycling. So instead of just a nanostructured intermediate to be calcined, lithium titanate hydrates can be the desirable final destination.

Date: 2017
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DOI: 10.1038/s41467-017-00574-9

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