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題名 | 矽材契合度對矽碳負極材料電池特性之影響=Battery Characteristic Effect of Si/Carbon Anode Material on the Coherence of Si |
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作 者 | 陳彥旭; 張家林; 張癸森; 李繼喜; 呂國旭; | 書刊名 | 石油季刊 |
卷期 | 53:1 2017.03[民106.03] |
頁次 | 頁95-100 |
分類號 | 440.34 |
關鍵詞 | 矽碳負極; 協同作用; 體積膨脹; Si/carbon anode material; Synergistic effect; Expansion of volume; |
語文 | 中文(Chinese) |
中文摘要 | 鋰離子電池負極碳系(含石墨系)材料因電容量不足,當正極材料的能量密度提昇40%時,如果搭配300mAh/g 碳系負極使用,全電池能量密度提昇不足10%。以矽為負極材料,因鋰離子高度嵌入/嵌出下,有著材料體積過度膨脹導致結構崩塌及矽材表面與電解液界面膜的形成,造成第一圈庫倫效率過低,無法單獨使用。目前多以搭配碳材形成矽碳負極使用,矽材彌補碳材電容量過低之不足,碳材減緩因鋰離子遷入矽材之體積膨脹,兩者存在特性的協同作用。本研究嘗試將矽材形貌、粒徑大小、添加比例、分散劑與搭配之緩衝碳材所形成之矽碳負極材料,研究矽材與碳材之間的協同作用,並將此作用影響對矽碳負極之電池特性進行有系統性地探討與分析。 |
英文摘要 | As the carbon-based anode with 300mAh/g is collocated with a cathode material which has 40 percent more on energy density, this combination only gives the energy density of a full battery cell less than 10%. This is because carbon-based anode materials including graphite-based ones have an inadequate capacity in lithium-ion batteries. Because of high intercalations/de-intercalations of lithium ion, Si as an anode material reveals excessive expansion of volume and results in structure cracking as well as an interface formation from the reaction of the Si surface with an electrolyte, These unwanted behaviors give rise to a low first-cycle coulombic efficiency. Si cannot be used alone as an anode material. At present, Si is combined with carbon materials to develop an anode material as Si/carbon. Si can compensate for the low capacity of carbon materials, and the carbon material can inhibit the expansion of volume due to intercalations/de-intercalations of lithium ion into Si. Combining these two characteristics results in a synergistic effect which will enhance the anode material performance. In this study, we develop an anode material of Si/carbon from integrating the morphology, particle sizes, and added ratios of Si as well as a dispersing agency into carbon materials as a buffer in order to study a synergistic effect between Si and carbon. Furthermore, the effective influence on the battery characteristics of Si/carbon anode materials will be discussed and analyzed systematically. |
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