Challenges and approaches for high-voltage spinel lithium-ion batteries

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Lithium-ion (Li-ion) batteries are crucial for electric vehicles (EVs) due to their high energy density.
• Next-generation cathode materials are sought to enhance EV driving range and reduce costs.
• LiNi(0.5)Mn(1.5)O(4) (LNMO) high-voltage spinel is a promising cathode material with high operating voltage and good rate capability.

Purpose of the Study:

• To review the challenges associated with electrolyte decomposition in high-voltage spinel cathodes for Li-ion batteries.
• To consolidate and present various approaches to mitigate degradative reactions at electrode/electrolyte interfaces.
• To address the critical barrier hindering the commercialization of high-voltage spinel Li-ion batteries.

Main Methods:

• Systematic review of recent research on LNMO cathode materials and their performance in full cells.
• Analysis of electrolyte decomposition mechanisms and electrode/electrolyte interface reactions.
• Consolidation of findings from scattered reports on mitigating these degradation processes.

Main Results:

• Electrolyte decomposition and interface reactions are the primary limitations for the cycle life of LNMO/graphite full cells.
• Significant research efforts have focused on understanding the structure-property relationships in LNMO.
• Various strategies exist to address electrolyte decomposition, though not yet comprehensively reviewed.

Conclusions:

• Overcoming electrolyte decomposition is essential for the commercial viability of high-voltage spinel Li-ion batteries.
• This review provides a consolidated perspective on the challenges and mitigation strategies for LNMO cathodes.
• Further research and systematic approaches are needed to ensure the long-term stability and performance of these advanced batteries.