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Understanding the interlayer rearrangement toward enhanced lithium storage for LiBC anodes.

Qianwen Yang1, Langlang Chen1, Zhiyu Liu1

  • 1State Key Laboratory on Marine Resource Utilization in South China Sea, Hainan Provincial Key Laboratory of Research on Utilization of Si-Zr-Ti Resources, School of Materials Science and Engineering, Hainan University, Haikou 570228, China. yqwei@hainanu.edu.cn.

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Introducing lithium (Li) insufficiency into lithium borate compounds (LiBC) significantly enhances electrochemical capacity. This structural evolution, driven by Li deficiency, improves Li+ extraction, boosting battery performance.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Chemistry

Background:

  • Lithium borate compounds (LiBC) are explored for energy storage applications.
  • Optimizing lithium-ion extraction is crucial for enhancing battery capacity.
  • Structural modifications can influence the electrochemical properties of LiBC.

Purpose of the Study:

  • To investigate the effect of lithium (Li) insufficiency on the structure and electrochemical performance of LiBC.
  • To understand the mechanism of structural evolution and its impact on Li+ extraction.
  • To explore new strategies for activating Li+ extraction in lithium compounds.

Main Methods:

  • Synthesis of modified LiBC (m-LiBC) under conditions of Li insufficiency.
  • Structural characterization of original (o-LiBC) and m-LiBC using techniques like X-ray diffraction (XRD).
  • Electrochemical testing to measure the capacity of o-LiBC and m-LiBC.

Main Results:

  • m-LiBC demonstrates a significantly higher capacity (220 mA h g-1) compared to o-LiBC (50 mA h g-1).
  • Li insufficiency induces structural evolution in LiBC, altering interlayer stacking from 'ABABAB' (o-LiBC) to 'ABAABA' (m-LiBC).
  • The observed capacity enhancement is attributed to this Li-deficiency-triggered interlayer rearrangement.

Conclusions:

  • Controlled Li insufficiency is an effective strategy to enhance the electrochemical capacity of LiBC.
  • Interlayer rearrangement plays a key role in facilitating Li+ extraction in LiBC.
  • This work provides insights into activating Li+ extraction in other lithium-containing materials.