Effect of Al2O3/P2O5 Molar Ratio on Structure and Properties of Sealing Glass for Power Lithium Batteries

doi:10.15541/jim20250283

Abstract

Abstract: This study presents a new kind of sealing glass based on P₂O₅-Al₂O₃-B₂O₃-R₂O-NaF system, which exhibits a high thermal expansion coefficient (CTE) suitable for sealing power lithium batteries. The effects of Al₂O₃/P₂O₅ molar ratio on the structure, thermal properties, sealing performance and chemical stability of the sealing glass were characterized. The results show that as the Al₂O₃/P₂O₅ molar ratio increases from 0.35 to 0.76, the number of P-O-P bridge oxygen bonds within the glass structure gradually decreases, and the content of [AlO₄] tetrahedra climbs up and then declines, leading to an initial increase in the compactness of the phosphate glass network structure, followed by a decrease. Correspondingly, the CTE of the glass first decreases from 164.5×10^-7 ℃^-1 to 160×10^-7 ℃^-1, and then gradually increases to 175.9×10^-7 ℃^-1, while the sealing temperature initially rises to 588 ℃ and subsequently falls to 549 ℃. The acid resistance of the glass also follows this trend, initially improving and then deteriorating. The phosphate sealing glass prepared in this study display proper balance among high CTE, low sealing temperature and excellent chemical stability, providing theoretical and technical support for the development of a low-temperature sealing process for the electrodes of power lithium batteries.

Key words: power lithium battery, phosphate glass, high thermal expansion coefficient, sealing temperature, acid resistance

CLC Number:

TQ171

WANG Weiwei, CAO Xin, LIU Junfei, YANG Xiaofei, HAN Na, LI Xingcong, SHI Lifen. Effect of Al₂O₃/P₂O₅ Molar Ratio on Structure and Properties of Sealing Glass for Power Lithium Batteries[J]. Journal of Inorganic Materials, DOI: 10.15541/jim20250283.

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Effect of Al₂O₃/P₂O₅ Molar Ratio on Structure and Properties of Sealing Glass for Power Lithium Batteries

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