Improved Electrochemical Capacity of Precursor-Derived Si(B)CN-Carbon Nanotube Composite as Li-Ion Battery Anode
Improved Electrochemical Capacity of Precursor-Derived Si(B)CN-Carbon Nanotube Composite as Li-Ion Battery Anode
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DOI：
10.1021/am3015795
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发表时间：
2012-10-01
影响因子：
9.5
通讯作者：
Singh, G.
中科院分区：
文献类型：
--
作者：
Bhandavat, R.;Singh, G.
研究了前驱体碳氮化硅(Si(B)CN)陶瓷和包覆Si(B)CN的多壁碳纳米管(CNT)复合材料作为锂离子电池负极的电化学行为。30次循环后，Si(B)CN的可逆容量达到138 mA h/g，是相同条件下制备的SiCN的4倍(相当于25 mA h/g)，而Si(B)CN-CNT复合材料在30次循环后的可逆容量进一步提高，达到412 mA h/g。Si(B)CN性能的提高归功于硼的存在，硼的存在改变了SiCN的纳米域结构，从而提高了化学稳定性和电子导电性。循环后的显微镜和化学分析表明，阳极形成了稳定的钝化层，从而导致了稳定的循环。
We study the electrochemical behavior of precursor-derived siliconboron carbonitride (Si(B)CN) ceramic and Si(B)CN coated-multiwalled carbon nanotube (CNT) composite as a lithium-ion battery anode. Reversible capacity of Si(B)CN was observed to be 138 mA h/g after 30 cycles, which is four times that of SiCN (similar to 25 mA h/g) processed under similar conditions, while the Si(B)CN-CNT composite showed further enhancement demonstrating 412 mA h/g after 30 cycles. Improved performance of Si(B)CN is attributed to the presence of boron that is known to modify SiCN's nanodomain structure resulting in improved chemical stability and electronic conductivity. Post-cycling microscopy and chemical analysis of the anode revealed formation of a stable passivating layer, which resulted in stable cycling.