Differential Impacts of Ceramic Coatings on Separators for Lithium Iron Phosphate Battery Performance

doi:10.3969/j.issn.1008-0198.2026.04.019

Abstract

Abstract: This study systematically compares the effects of aluminum oxide-coated separator and boehmite-coated separator on the performance of 280 A·h prismatic aluminum-shell lithium iron phosphate batteries. The results show that after 423 cycles, the discharge energy retention rate and energy efficiency of the battery are improved by 0.87 percentage points and 0.39 percentage points, respectively compared to the boehmite-coated separator battery. In three types of abuse tests such as namely overcharging, external heating, and needle puncture, the safety valve opening time, voltage drop time, and thermal runaway triggering time of the 9AS battery are delayed by 1.9~131 min, 1.3~1.8 min, and 0.26~2.04 min, respectively compared to the boehmite-coated diaphragm battery, and the thermal runaway triggering temperature was increased by 2~7.7 ℃. These performance advantages are mainly attributed to the superior ion conductivity, higher electrochemical stability, and stronger mechanical and thermal properties of alumina coatings. This study provides critical data support for the selection of separators and performance optimization of lithium iron phosphate batteries, particularly for applications with high safety and long life requirements such as energy storage systems.

Key words: lithium-ion battery, separator, ceramic coating, safety, electrochemical performance

CLC Number:

TM911

LIU Jingju, WANG Jiangfeng, CHEN Kuo, CHEN Luojia, CHEN Baohui. Differential Impacts of Ceramic Coatings on Separators for Lithium Iron Phosphate Battery Performance[J]. Hunan Electric Power, 2026, 46(4): 144-151.

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