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Updated: Oct 9, 2025
11:25
In Situ Neutron Powder Diffraction Using Custom-made Lithium-ion Batteries
Published on: November 10, 2014
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Dynamic spatial progression of isolated lithium during battery operations.
Fang Liu1, Rong Xu1, Yecun Wu2
1Department of Materials Science and Engineering, Stanford University, Stanford, CA, USA.
Nature
|December 23, 2021
Summary
Isolated lithium (i-Li) in batteries is not dead but moves dynamically, impacting battery performance. This study reveals i-Li
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Next-generation energy storage demands high-performance lithium batteries.
- Current lithium anodes suffer from capacity decay and short cycle life due to solid electrolyte interface and isolated lithium (i-Li) formation.
- Isolated lithium is typically considered electrochemically inactive, contributing to capacity loss.
Purpose of the Study:
- To challenge the presumption that isolated lithium (i-Li) is electrochemically inactive.
- To investigate the dynamic behavior and electrochemical responsiveness of i-Li in lithium batteries.
- To explore methods for recovering i-Li and improving battery performance.
Main Methods:
- Utilized simulations to analyze the behavior of i-Li under electric fields.
- Investigated i-Li dynamics, including deposition and dissolution at its ends.
- Conducted experiments in Cu-Li cells and LiNi0.5Mn0.3Co0.2O2 (NMC)-Li full cells.
Main Results:
- Demonstrated that i-Li is highly responsive to battery operations through dynamic polarization.
- Observed simultaneous Li deposition and dissolution on i-Li ends, causing spatial progression.
- Simulation results indicated that i-Li progression rate depends on its length, orientation, and current density.
- Achieved >100% Coulombic efficiency in Cu-Li cells by recovering i-Li.
- Extended the cycle life of NMC-Li full cells.
Conclusions:
- Isolated lithium (i-Li) is electrochemically active and dynamically moves within lithium batteries.
- Understanding and controlling i-Li behavior is crucial for enhancing battery performance and longevity.
- The recovery of i-Li offers a promising strategy for improving Coulombic efficiency and cycle life in lithium batteries.
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