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.

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。为了改善硅基负极材料的体积膨胀问题，使用镁热还原技术制备了gC ₃ N ₄ / Si纳米复合材料。众所周知，gC ₃ N ₄ / Si纳米复合材料不仅可以提高电子传输能力，而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因硅的体积膨胀而引起的应力和应变。当gC ₃ N ₄评估/ Si电极，gC ₃ N ₄ / Si纳米复合材料在0.1 A / g时的初始放电容量高达1033.3 mAh / g，并且在400次循环后其可逆容量保持在548 mAh / g。同时，在2.0 A / g时具有218 mAh / g的相对较高的可逆比容量，从而实现了提高的倍率性能。优异的锂存储性能得益于独特的gC ₃ N ₄ / Si纳米结构，与纯硅相比，该纳米结构可提高导电性，减少体积膨胀并加速锂离子的传输。