1. School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China 2. Marine Equipment and Technology Institute, Jiangsu University of Science and Technology, Zhenjiang 212003, China 3. Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province, Yancheng Institute of Technology, Yancheng 224051, China 4. School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang 212013, China
硅基材料作为锂离子电池的负极材料，具有较高的理论容量，但在充放电过程中其体积变化很大。为了缓解硅基负极材料的体积膨胀问题，通过镁热还原技术制备了g-C3N4/Si纳米复合材料。众所周知，g-C3N4/Si纳米复合材料不仅可以提高电子传输能力，且可以改善材料的物理性能，以适应锂在锂化和脱锂过程中体积膨胀引起的应力和应变。在评估g-C3N4/Si复合电极时，g-C3N4/Si纳米复合材料的初始放电容量在0.1 A g-1时高达1033.3 mAh g-1，并且在400次循环后其可逆容量保持在548 mAh g-1。同时，在2.0 A g-1时具有218 mAh g-1的可逆比容量，展现出较高倍率性能。优异的储锂性能得益于独特的g-C3N4/Si纳米结构，与纯硅相比，它可以提高导电性，减少体积膨胀并加速锂离子的传输。
Abstract：
As the anode material of lithium-ion battery, silicon-based materials have a high theoretical capacity, but their volume changes greatly in the charging and discharging process. To ameliorate the volume expansion issue of silicon-based anode materials, g-C3N4/Si nanocomposites are prepared by using the magnesium thermal reduction technique. It is well known that g-C3N4/Si nanocomposites can not only improve the electronic transmission ability, but also ameliorate the physical properties of the material for adapting the stress and strain caused by the volume expansion of silicon in the lithiation and delithiation process. When g-C3N4/Si electrode is evaluated, the initial discharge capacity of g-C3N4/Si nanocomposites is as high as 1033.3 mAh/g at 0.1 A/g, and its reversible capacity is maintained at 548 mAh/g after 400 cycles. Meanwhile, the improved rate capability is achieved with a relatively high reversible specific capacity of 218 mAh/g at 2.0 A/g. The superior lithium storage performances benefit from the unique g-C3N4/Si nanostructure, which improves electroconductivity, reduces volume expansion, and accelerates lithium-ion transmission compared to pure silicon.
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