Boric acid catalyzed hard carbon micron fiber derived from cotton as a high performance anode for lithium ion batteries
Boric acid catalyzed hard carbon micron fiber derived from cotton as a high performance anode for lithium ion batteries
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硼酸催化的棉花硬碳微米纤维作为锂离子电池的高性能阳极
DOI：
10.1002/ente.201801164
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发表时间：
2019
影响因子：
3.8
通讯作者：
Shaochang Han
中科院分区：
文献类型：
--
作者：
Muchu Tan;Weihua Zhang;Changling Fan;Lingfang Li;Han Chen;Rong Li;Ting Luo;Shaochang Han
研究了硼酸在800 °C下对棉纤维合成硬炭的催化作用。X射线衍射分析表明，d002减小，碳晶体尺寸增大，这只能在更高的温度下实现。硼原子主要结合在颗粒的表层。B：C = 2.5的样品在30、1500 mA g− 1下的比容量分别从381.0和149.7 mAh g−1（B：C = 0）增加到526.8和196.6 mAh g−1。这不仅归因于0.1V附近的平台，这是由石墨层间的插层机制引起的，而且归因于微孔的存储机制。在300 mA g− 1下，第200次循环的容量保持率从88.5%提高到94.1%。从而加快了棉花的炭化过程，证明硼酸的催化作用是可行的。这些改进部分是由于碳层的扩大和规则堆叠，可以容纳更多的锂离子。由于硼原子的缺电子性和快速的转移速度，硼原子可以占据缺陷空位点和有序，形成大的碳层。
The catalysis role of boric acid at 800 °C is investigated in the synthesis of hard carbon from cotton. X‐ray diffraction analysis shows thatd002decreases and the size of the carbon crystal increases, which can only be realized at a higher temperature. Boron atoms are mainly combined on the surface layer of the particle. The specific capacity of the sample with B:C = 2.5 at 30, 1500 mA g−1increases from 381.0 and 149.7 mAh g−1(B:C = 0) to 526.8 and 196.6 mAh g−1, respectively. It is attributed not only to the plateau around 0.1 V, which results from the intercalation mechanism between graphite layers, but also to the storage mechanism of micropores. The capacity retention in the 200th cycle at 300 mA g−1is improved from 88.5% to 94.1%. Therefore, the carbonization process of cotton is accelerated, and the catalysis function of boric acid proves to be workable. These improvements are partially resulting from the enlargement and regular stacking of carbon layers, which can accommodate more lithium ions. As boron atoms can occupy the defect vacancy points and order, large carbon layers are formed because of the electron deficiency property and fast transfer speed of boron atoms.