CAJ | 학술논문

以A123系统公司出品的2200 mA?h磷酸铁锂电池为研究对象，以3C电流倍率25℃常温条件下满充满放进行了3500次循环，同时每200个循环测试1C电流倍率条件下的充放电曲线、内阻衰退情况、容量衰退情况、OCV-SOC曲线以及1/20C电流倍率条件下的dQ/dV峰值曲线变化情况。为了验证上述容量衰退机制的分析方法，将3500循环后的A123磷酸铁锂电池在手套箱中拆解并组装成扣式半电池，正极半电池与负极半电池的测试结果以及拆解前后的容量匹配分析验证了上述容量衰退分析方法的正确性和有效性。
이A123계통공사출품적2200 mA?h린산철리전지위연구대상，이3C전류배솔25℃상온조건하만충만방진행료3500차순배，동시매200개순배측시1C전류배솔조건하적충방전곡선、내조쇠퇴정황、용량쇠퇴정황、OCV-SOC곡선이급1/20C전류배솔조건하적dQ/dV봉치곡선변화정황。위료험증상술용량쇠퇴궤제적분석방법，장3500순배후적A123린산철리전지재수투상중탁해병조장성구식반전지，정겁반전지여부겁반전지적측시결과이급탁해전후적용량필배분석험증료상술용량쇠퇴분석방법적정학성화유효성。
Taking the 2200 mA?h lithium iron phosphate (LiFePO4, LFP) battery manufactured by A123 systems Inc. as research object, 3500 cycles of fully charged and discharged test for 2 200 mA?h LFP battery is performed under the current rate of 3C at the ambient temperature of 25℃, meanwhile the test is interrupted after every 200 cycles, and at this point the charging and discharging under the current rate of 1C, the fading of resistance and internal resistance of the battery and the open circuit voltage-state of charge (OCV-SOC) curve as well as the peak curve variation of dQ/dV under the current rate of 1/20C are measured. To validate above-mentioned method to analyze the capacity fading mechanism, the A123 2200 mA?h LFP battery underwent full test cycle is disassembled in the glove box and reassembled as the button half-cell, and the test results of the half-cell with positive polarity and that with negative polarity as well as the analysis on the capacity matching before and after the disassembly show that the proposed analysis method for the capacity fading of LFP battery is correct and effective.