Abstract <p>Thermal Runaway is a major issue of lithium-ion batteries due to the flammable and volatile behavior of binary liquid electrolytes used in this. Various optimization works majorly focused on the electrolyte and separators that are being used to develop thermally stable batteries. However, the thermal stability of advanced electrolytes and separators still requires further validation, as research in this area is in its early stages. In this study, a Ga-doped LLZO solid electrolyte cum separator pallet was fabricated and its thermal stability is compared with existing polypropylene (PP) separator and ceramic separator. This evaluation of thermal stability provides a material-level perspective on how optimized electrolyte and separator integration can mitigate thermal runaway risks in next-generation lithium-ion batteries. In the Thermogravimetric measurements-based comparison it was revealed that even at 1200<InlineEquation ID="IEq1"> <EquationSource Format="TEX">$^{\circ}$</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mrow /> <mo>∘</mo> </mmultiscripts> </math></EquationSource> </InlineEquation>C, the fabricated green solid electrolyte pallet retained ~ 64% of its original mass, whereas the ceramic separator retained only ~ 36%, and the PP separator completely degraded, retaining ~ 0% of its mass at just 450<InlineEquation ID="IEq2"> <EquationSource Format="TEX">$^{\circ}$</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mrow /> <mo>∘</mo> </mmultiscripts> </math></EquationSource> </InlineEquation>C. Furthermore, decomposition temperature analysis showed that the Ga-doped LLZO solid electrolyte decomposed at approximately 600<InlineEquation ID="IEq3"> <EquationSource Format="TEX">$^{\circ}$</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mrow /> <mo>∘</mo> </mmultiscripts> </math></EquationSource> </InlineEquation>C, while the LiPF<InlineEquation ID="IEq4"> <EquationSource Format="TEX">$_{6}$</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mn>6</mn> <mrow /> </mmultiscripts> </math></EquationSource> </InlineEquation> binary liquid electrolyte began decomposing at just 80<InlineEquation ID="IEq5"> <EquationSource Format="TEX">$^{\circ}$</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mrow /> <mo>∘</mo> </mmultiscripts> </math></EquationSource> </InlineEquation>C. Overall, the fabricated solid electrolyte pallet is found to exhibit higher thermal stability compared to the other separators and electrolytes, and it is recommended to be used for the development of a thermally stable next-generation battery.</p> Graphical abstract <p>Alt Text: A comparative illustration demonstrating the thermal stability enhancement of lithium batteries using optimized separators and electrolytes, such as ceramic separators and solid-state electrolytes. </p>

Enhancing battery thermal stability via optimized electrolyte and separator integration

期刊论文
发表日期：

2026年1月5日

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Alok Kumar Chaudhary,
Arjun Deo

摘要

Abstract

Thermal Runaway is a major issue of lithium-ion batteries due to the flammable and volatile behavior of binary liquid electrolytes used in this. Various optimization works majorly focused on the electrolyte and separators that are being used to develop thermally stable batteries. However, the thermal stability of advanced electrolytes and separators still requires further validation, as research in this area is in its early stages. In this study, a Ga-doped LLZO solid electrolyte cum separator pallet was fabricated and its thermal stability is compared with existing polypropylene (PP) separator and ceramic separator. This evaluation of thermal stability provides a material-level perspective on how optimized electrolyte and separator integration can mitigate thermal runaway risks in next-generation lithium-ion batteries. In the Thermogravimetric measurements-based comparison it was revealed that even at 1200 $^{\circ}$ $^{\circ}$ C, the fabricated green solid electrolyte pallet retained ~ 64% of its original mass, whereas the ceramic separator retained only ~ 36%, and the PP separator completely degraded, retaining ~ 0% of its mass at just 450 $^{\circ}$ $^{\circ}$ C. Furthermore, decomposition temperature analysis showed that the Ga-doped LLZO solid electrolyte decomposed at approximately 600 $^{\circ}$ $^{\circ}$ C, while the LiPF $_{6}$ $_{6}$ binary liquid electrolyte began decomposing at just 80 $^{\circ}$ $^{\circ}$ C. Overall, the fabricated solid electrolyte pallet is found to exhibit higher thermal stability compared to the other separators and electrolytes, and it is recommended to be used for the development of a thermally stable next-generation battery.

Graphical abstract

Alt Text: A comparative illustration demonstrating the thermal stability enhancement of lithium batteries using optimized separators and electrolytes, such as ceramic separators and solid-state electrolytes.