| Hybrid Point-to-Line Conductive Network of Carbon Nanotubes and Denka Black for High-Rate Lithium-Ion Battery Cathodes |
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Jekyeong Yu1, Yujeong Yun1, Sunkyung You1, Su-Won Yang2, Jong-Ho Song2, Jinjoo Park1, Seongki Ahn3, Jeha Kim1, Hong-Il Kim1 |
1Department of Energy Convergence Engineering, Cheongju University, 111 Taejeong-ro, Maengdong-myeon, Eumseong-gun, Chungcheongbuk-do, 27739, Republic of Korea
2Songjeong Co., Ltd., 493 Seobu-ro, Gangnae-myeon, Cheongju-si, Chungcheongbuk-do, 28177, Republic of Korea
3Department of Chemical Engineering, Research Center of Chemical Technology, Hankyong National University, 27, Jungangro, Anseong-si, Gyeonggi-do, 17738, Republic of Korea |
Correspondence:
Seongki Ahn,
Email: skahn@hknu.ac.kr
Jeha Kim,
Email: jeha@cju.ac.kr
Hong-Il Kim,
Email: hikim007@cju.ac.kr
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Received: 25 November 2025 • Accepted: 1 January 2026 |
| Abstract |
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In this study, a composite dispersion of conductive additives, comprising carbon nanotubes (CNT) and Denka Black (DB), was prepared via a high-pressure homogenization(HPH) process. This approach was designed to overcome the limitations of carbon black-based conductive networks in lithium-ion battery cathodes. Raman mapping confirmed the uniform dispersion of the CNT+DB mixture, while scanning electron microscopy revealed that the composite additive formed a more continuous point-to-line conductive network compared to individual CNT or DB electrodes. Electrical conductivity measurements and electrochemical impedance spectroscopy revealed higher electronic conductivity and lower charge-transfer resistance of the CNT+DB than the individual additives. During cyclic voltammetry, the CNT+DB electrode exhibited the highest peak current among the samples, suggesting more active redox behavior. Electrochemical performance tests demonstrated that the CNT+DB electrode retained 55.7% of its initial capacity at 5C and maintained 71.9% of its capacity during long-term cycling at 2C, exhibiting enhanced high-rate stability. These findings indicate that the three-dimensional conductive network created by combining CNT and DB effectively enhances electron pathways and stabilizes ion transport within the electrode. |
| Keywords:
Carbon Nanotubes, Denka Black, Conductive Network, High-pressure homogenization |
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