Optimizations of Graphitic Carbon/Silicon Hybrids for Scalable Preparation with High-Performance Lithium-Ion Storage
Optimizations of Graphitic Carbon/Silicon Hybrids for Scalable Preparation with High-Performance Lithium-Ion Storage
复制标题
石墨碳/硅杂化物的优化，用于高性能锂离子存储的可扩展制备
DOI：
10.1021/acssuschemeng.2c00316
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发表时间：
2022-04
影响因子：
8.4
通讯作者：
Honglai Liu
中科院分区：
文献类型：
--
作者：
Xinrui Li;Haiping Su;Cheng Ma;Keming Hou;Jian Wang;Hongzhen Lin;Yazhuo Shang;Honglai Liu
由于Si的高理论容量和碳材料的高导电性，Si/石墨碳复合材料显示出良好的应用前景。但由于其合成复杂、成本高、产量低、利用率低、体积变化大等问题，一直阻碍着其实际应用。本文采用低温催化石墨化的方法，优化了不同石墨化度和形貌的石墨炭的制备工艺，并进行了规模化制备。结果表明，随着石墨化度和电导率的增加，初始库仑效率（ICE）沿着提高。更少的晶格缺陷的存在也减少了在第一放电过程中SEI的形成，导致高利用率。因此，如此制成的电极的初始容量为2189 mA h g-1，200次循环后容量为1081 mA h g-1。此外，由于采用化学气相沉积法在电极表面包覆碳层，使得电极的可逆容量达到996 mA h g-1，500次循环后的容量保持率为70.9%，显示出很大的发展潜力.
The Si/graphitic carbon composites display the promising future due to the high theoretical capacity of Si and the ultrahigh conductivity of carbonaceous materials. However, their practical applications have always been hindered by the complex synthesis, high cost, low production, and low utilization with large volumetric changes. Herein, different kinds of graphitic carbons (GCs) with different graphitization degrees and morphologies are optimized in a catalytic graphitization route at low temperature for large-scale preparation. Mixed with the silicon nanoparticles as anode materials, it is found that the initial Coulombic efficiency (ICE) is significantly enhanced along with the increasing degree of graphitization and electronic conductivity. The presence of fewer lattice defects also reduces the formation of SEI in the first discharge process, resulting in high utilization. As a consequence, the so-fabricated electrode exhibits an initial capacity of 2189 mA h g–1and a capacity of 1081 mA h g–1after 200 cycles. Moreover, with the help of the negligible weight of the covered carbon layer by chemical vapor deposition approach on the hybrid electrode, the optimized electrode delivers a reversible capacity of 996 mA h g–1with improved capacity retention of 70.9% after 500 cycles, showing the great potential in the future.
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影响因子：
17.1
作者：
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通讯作者：
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影响因子：
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