國立台灣科技大學-專利商品網-專利推廣清單-高容量矽碳電極材料及其合成方法

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技術名稱 Technology

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發明人 Inventor

盧承彥, 趙基揚, 吳乃立, 黃炳照, Arno, Kwade, Tobias, Placke, Martin, Winter, Jannes, Müller,

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所有權人 Asignee

國立臺灣科技大學

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專利國家 Country	申請號 Application No.	專利號 Patent No.	中心案號 Serial No.	年費有效日期
美國	17/554,468	US 12,500,238B2	1090099US0	2029/06/16
中國	202111548135.8	CN 116266624 B	1090099CN0	2026/12/17
中華民國	110147309	I788147	1090099TW0	2026/12/20

點閱數：201

技術摘要：

本研究中，採用交聯磺酸化幾丁聚醣 (X-SCS)來作為鋰離子電池 (LIBs)的矽/碳複合材料電極(Si@G)活性顆粒表面上的保護塗層。此保護塗層兼具熱穩定和化學穩定性，能有效的傳導鋰離子並防止活性顆粒和液態電解液直接接觸。因而，在長時間充放電循環下可以抑制矽顆粒從Si@G表面剝離和不穩定的SEI生成，從而提高循環穩定性。
本發明將用低分子量的PEO進行雙邊官能基化後當作交聯劑，為了提升交聯的磺酸化幾丁聚醣(X-SCS)保護層的可伸縮性與柔軟度來容忍矽更多的體積變異性，從而進一步改善電池循環後的保護層穩定性。XPEO-SCS 3保護層表現出最佳的循環穩定性，在0.5 C 室溫下充放電循環300次後擁有80%容量保持率和在5 C的測試條件下可以達到95%容量保持率的卓越表現。簡而言之，採用具有適當含量的X-SCS塗層可以有效改善電化學性能並抑制Si@G複合電極的體積膨脹以獲得更好的LIB效能。
In this study, we employed crosslinking sulfonated chitosan (denoted as X-SCS) to serve as protective coating on the active materials of silicon/graphite composite (Si@G) anode for lithium ion batteries (LIBs). The protective coating is thermally and chemically stable, and which would allow effective lithium ion transport as well as prevent direct contact between the active particles and the liquid electrolyte. As a consequence, detachment of Si from Si@G and undesirable SEI thickening could be suppressed after long term cycling, leading to improved cycling stability.
For low molecular weight bi-end functionalized PEO with epoxide terminals is served as crosslinking agent, in order to soften the X-SCS coating to accommodate more volume change of Si, thus to further improve the coating integrity after cycling. The resulting XPEO-SCS coating exhibits the best cycling stability with 80% capacity retention after 300 cycles at 0.5 C and superior C-rate performance with 95% capacity retention at 5 C. In brief, employing X-SCS coating with suitable composition could be a feasible approach to effectively improve electrochemical performance and suppress vigorously volume expansion of Si@G composite electrode for better LIBs.

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