A novel carbon modified Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ has been successfully fabricated by using activated carbon (AC) as template and carbon source via sol-gel method. The AC modified Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ (denoted as LLMO@AC) particles with less agglomeration show a nearly spherical structure with a size distribution range of 150~250 nm. As cathode material, such LLMO@AC delivers a significantly enhanced first capacity (245.7 mAh g⁻¹) with a satisfied capacity retention ratio (87.4%) after 100 cycles at 150 mA g⁻¹. Even if the current is increased to 1.5 A g⁻¹, LLMO@AC still owns a high average discharge capacity of 161.1 mAh g⁻¹. Electrochemical impedance spectroscopy results reveal that the LLMO@AC electrode has lower charge transfer resistance and higher lithium-ion diffusion coefficient compared with pristine LLMO and the LLMO synthesized by directly using glucose as carbon sources (LLMO@G). This work provides an effective modification strategy to improve the electrochemical performance of LLMO and promote the industrialization of LLMO.

中文翻译：

---

以活性炭为模板和碳源制备的Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 O 2的电化学性能增强

以活性炭（AC）为模板，通过溶胶-凝胶法制备碳源，成功制备了新型的碳改性Li _1.2 Mn _0.54 Ni _0.13 Co _0.13 O ₂。团聚程度较小的AC改性Li _1.2 Mn _0.54 Ni _0.13 Co _0.13 O ₂（表示为LLMO @ AC）颗粒呈近球形，尺寸分布范围为150〜250 nm。作为正极材料，此类LLMO @ AC在150 mA g ^-1下循环100次后，可显着提高第一容量（245.7 mAh g ^-1），并具有令人满意的容量保持率（87.4％）。。即使电流增加到1.5 A g ^-1，LLMO @ AC仍具有161.1 mAh g ^-1的高平均放电容量。电化学阻抗谱结果表明，与原始LLMO和直接以葡萄糖为碳源（LLMO @ G）合成的LLMO相比，LLMO @ AC电极具有更低的电荷转移电阻和更高的锂离子扩散系数。这项工作为提高LLMO的电化学性能和促进LLMO的产业化提供了有效的修饰策略。