전극 건조 온도가 리튬이차전지의 실리콘 전극 특성에 미치는 영향 연구
Study on The Effect of Electrode Drying Temperature on The Silicon Electrode Characteristics of Lithium Secondary Batteries
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초록
상용화된 리튬이차전지의 전극은 습식 공정을 통해 제조되고 있으며, 전극의 건조공정은 전극 생산속도 및 공정비용 측면에서 매우 중요한 요소이다. 본 연구에서는 실리콘 전극의 건조 조건에따른 품질 및 이를 포함하는 전극의 전기화학적 성능을 조사하고자, 고온(180 oC) 및 저온(50 oC) 건조 조건에서 실리콘 음극을 제조하였다. 고온 건조 조건은 전극 슬러리 내 용매를 빠르게 증발시키며 전극 생산속도를 향상시킬 수 있지만, 집전체로부터 전극 복합체의 박리를 유발하였다. 그 결과 실리콘 전극의 접착력을 약화시키고 전극 코팅 품질을 감소시켰으며, 저온 대비고온 건조 조건에서 제조된 실리콘 전극은 두꺼운 복합체 두께를 보였다. 180 oC 전극은 50 oC 전극보다 면저항이 컸으며, 전기전도도는 낮았다. 또한 50 oC 전극은 180 oC 전극 대비 152.5% 우수한 수명 특성을 보였다(300회의 충·방전 이후 180 oC 전극 용량 = 844 mAh g–1, 50 oC 전극 용량 = 1287 mAh g–1). 실리콘 전극에 대한 건조 조건 설정은 손쉽게 실리콘 전극의 품질 및 안정성을 향상시킬 수 있는 새로운 시각을 제공할 수 있다.
Abstract
The electrodes of commercialized lithium secondary batteries are manufactured through a wet coating process, and the drying process (DC) is a very important factor as to electrode production speed and process cost. In this study, silicon anodes were manufactured under high-temperature (180 oC) and low-temperature (50 oC) DC to investigate the quality and the electrochemical performance of Si-electrodes according to DC. High-temperature DC can quickly evaporate the solvent in the Si-electrode slurry, improving the electrode production rate. However, this also causes the electrode composite to peel off from the current collector. As a result, the Si-electrode’s adhesion weakened, and the electrode coating’s quality deteriorated. In addition, the Si-electrode manufactured under high-temperature was found to have a thicker composite material than the Si-electrode manufactured under low-temperature. Si-electrodes manufactured under high-temperature had higher sheet resistance and lower electrical conductivity than those manufactured under low-temperature. Consequently, the Si-electrode manufactured under low-temperature showed 152.5% superior cycle performance compared to the Sielectrode manufactured under high-temperature. (Discharge capacities of Si-electrodes manufactured under high-temperature and low-temperature DC were 844 and 1287 mAh g–1, respectively, after 300 cycles). Establishing the DC of Si-electrodes can easily provide new perspectives to improve the quality and stability of Si-electrodes.
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