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| Preparation of lithium-ion battery anode material from natural graphite spherical tailings via spray granulation |
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Received:January 23, 2026
Revised:February 04, 2026
Accepted:February 09, 2026
Published Online:April 30, 2026
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| DOI：10.3969/j.issn.1005-7854.2026.02.014 |
| KeyWord:lithium-ion batteries;natural graphite;spherical tailings;secondary granulation;anode materials;rate performance |
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1.School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing)
, Beijing 100083, China;2.School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;3.Department of Electrical Engineering, Tsinghua University, Beijing 100084, China |
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| Abstract: |
| Natural graphite spherical tailings (NGST) are the main by-product generated during the spheroidization processing of natural graphite anode materials. Currently, NGST are mostly discarded or utilized in low-value applications, leading to resource waste and environmental pressure. To achieve high-value utilization of NGST, this study used natural graphite spherical tailings with a D50 of 4.37 μm (NGST4) as the raw material. Water-soluble phenolic resin (WSPR) was employed as both the binder and hard carbon precursor, while high-temperature pitch (HTP) served as the soft carbon precursor. Through spray granulation combined with high-temperature carbonization, a secondary particle composite anode material with a hard-soft carbon hybrid coating structure was prepared. When the mass ratio of WSPR to HTP was 2∶8, the resulting material (denoted as H2S8G) exhibited an increased D50 of 17.80 μm. Its tap density rose from 0.20 g·cm?3 (NGST4) to 0.38 g·cm?3, and its specific surface area decreased from 14.58 m2·g?1 to 6.29 m2·g?1. Characterization revealed that a dense amorphous carbon composite coating formed on the graphite surface, which effectively suppressed electrolyte side reactions and facilitated lithium-ion interfacial transport. Electrochemical tests showed that the discharge specific capacity of H2S8G reached 177.17 mAh·g?1 at 6 C, significantly higher than the 27.08 mAh·g?1 of NGST4, demonstrating excellent rate performance. This study provides a feasible technical pathway for the high-performance utilization of NGST. |
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