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Updated: Apr 15, 2026

Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature

Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature

Published on: December 20, 2016

Optimizing Depth-of-Discharge in Li-Rich Halide All-Solid-State Batteries for Enhanced Capacity and Cycling

Yunan Zhou^1,2,3, Naibo Zhao², Xin Chen¹

¹College of Materials Science and Engineering, Qingdao University, Qingdao 266071, China.

Materials (Basel, Switzerland)

|April 14, 2026

Summary

Optimizing discharge cut-off voltage in halide solid electrolyte batteries with Li-rich cathodes improves cycling stability. This depth-of-discharge regulation enhances capacity retention for durable, high-performance all-solid-state lithium batteries.

Keywords:

Li-rich layered oxides all-solid-state batteries depth-of-discharge halide solid electrolyte interfacial stability structural degradation voltage decay

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Last Updated: Apr 15, 2026

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Published on: March 7, 2022

Area of Science:

Materials Science
Electrochemistry
Energy Storage

Background:

Halide solid electrolytes (HSEs) offer advantages over sulfides for all-solid-state lithium batteries (ASSLBs).
Li-rich layered oxides (LLOs) provide high capacity but face challenges with cycling stability in HSE-ASSLBs.
A trade-off exists between high capacity and stability in current HSE-ASSLB designs.

Purpose of the Study:

To investigate the impact of depth-of-discharge (DOD) on the performance of LLO-based HSE-ASSLBs.
To identify an optimal discharge cut-off voltage for enhanced cycling stability and capacity utilization.
To resolve the fundamental trade-off between capacity and stability in these battery systems.

Main Methods:

Controlled adjustment of discharge cut-off voltage to regulate DOD.
Analysis of dQ/dV profiles to understand electrochemical behavior.
Post-cycling analysis of electrode materials to examine degradation mechanisms.
Fabrication and testing of HSE-ASSLBs using specific LLO cathode and HSE electrolyte compositions.

Main Results:

Excessive DOD (lower cut-off voltages) leads to structural degradation and interfacial reactions.
Insufficient DOD (higher cut-off voltage) limits full utilization of low-voltage redox couples.
An optimized cut-off voltage of 2.6 V activates a stable 2.85 V redox reaction, balancing capacity and stability.
The optimized ASSLB demonstrated an initial capacity of 281.6 mAh g^-1 and improved retention from 71.8% to 86.1% over 300 cycles.

Conclusions:

Depth-of-discharge regulation via cut-off voltage is a viable strategy for improving HSE-ASSLB performance.
Optimized DOD effectively mitigates degradation and enhances the utilization of LLO cathode materials.
This electrochemical protocol enables durable, high-capacity output in LLO-based ASSLBs.