本发明涉及一种均匀改性的氧化亚硅负极材料及其制备方法和应用。氧化亚硅负极材料包括：氧化亚硅和碳原子，其中所述碳原子以原子级别均匀分布在氧化亚硅中；碳原子与硅原子结合形成无定型的S i‑C键，X射线衍射能谱(XRD)中无S i C的结晶峰；在所述均匀改性的氧化亚硅负极材料的固体核磁共振NMR检测中，29S i NMR图谱显示，在‑10ppm～‑20ppm之间，存在S i‑C的共振峰；所述氧化亚硅负极材料颗粒的平均粒径D50为1nm‑100μm，比表面积为0.5m2/g‑40m2/g；所述碳原子的质量占氧化亚硅质量的0.1％‑40％。本发明以气态方法使得碳原子以原子级均匀内嵌在氧化亚硅中，材料在脱嵌锂过程中体积膨胀小，对锂离子的传导系数高，提高了材料的循环性能和倍率性能。
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