Journal of the Korean Electrochemical Society (전기화학회지)

The Korean Electrochemical Society (한국전기화학회)
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Study on The Effect of Electrode Drying Temperature on The Silicon Electrode Characteristics of Lithium Secondary Batteries

전극 건조 온도가 리튬이차전지의 실리콘 전극 특성에 미치는 영향 연구

  • Dong-Wan Ham (Hanbat National University) ;
  • Myeong-Hui Jeong (Hanbat National University) ;
  • Jeong-Tae Kim (Hanbat National University) ;
  • Beom-Hui Lee (Hanbat National University) ;
  • Hyeon-Mo Moon (Hanbat National University) ;
  • Sun-Yul Ryou (Hanbat National University)
  • 함동완 (한밭대학교 화학생명공학과) ;
  • 정명희 (한밭대학교 화학생명공학과) ;
  • 김정태 (한밭대학교 화학생명공학과) ;
  • 이범희 (한밭대학교 화학생명공학과) ;
  • 문현모 (한밭대학교 화학생명공학과) ;
  • 유선율 (한밭대학교 화학생명공학과)
  • Received : 2024.04.26
  • Accepted : 2024.07.22
  • Published : 2024.08.31
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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 ℃) and low-temperature (50 ℃) 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 Si-electrode 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.

상용화된 리튬이차전지의 전극은 습식 공정을 통해 제조되고 있으며, 전극의 건조공정은 전극 생산속도 및 공정비용 측면에서 매우 중요한 요소이다. 본 연구에서는 실리콘 전극의 건조 조건에 따른 품질 및 이를 포함하는 전극의 전기화학적 성능을 조사하고자, 고온(180 ℃) 및 저온(50 ℃) 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 대비 고온 건조 조건에서 제조된 실리콘 전극은 두꺼운 복합체 두께를 보였다. 180 ℃ 전극은 50 ℃ 전극보다 면저항이 컸으며, 전기전도도는 낮았다. 또한 50 ℃ 전극은 180 ℃ 전극 대비 152.5% 우수한 수명 특성을 보였다(300회의 충·방전 이후 180 ℃ 전극 용량 = 844 mAh g-1, 50 ℃ 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.

Keywords

Acknowledgement

This research was supported by the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (NRF-2021R1I1A3059728). This work was also supported by the Technology Innovation Program (no. 20015759) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea), the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (no. 2018R1A6A1A03026005).

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