CAJ | 학술논문

采用高温碳化裂解技术和高能球磨处理制备了改性的高容量Sn-Co/C负极复合材料．采用XRD、SEM、恒电流充放电和交流阻抗等技术对材料进行了表征和电话线性能测试．结果表明，高能球磨处理后，Sn-Co/C出现非晶、纳米晶的混合组织．电极的首次放电和充电容量分别为1098.9和771.3 mAh/g，经100次循环后可逆容量仍保持在425.1 mAh/g．稳定后平均容量衰减率为0.18％．改性的Sn-Co/C具有更高的锂离子扩散系数，提高了合金材料的充放电性能．
채용고온탄화렬해기술화고능구마처리제비료개성적고용량Sn-Co/C부겁복합재료．채용XRD、SEM、항전류충방전화교류조항등기술대재료진행료표정화전화선성능측시．결과표명，고능구마처리후，Sn-Co/C출현비정、납미정적혼합조직．전겁적수차방전화충전용량분별위1098.9화771.3 mAh/g，경100차순배후가역용량잉보지재425.1 mAh/g．은정후평균용량쇠감솔위0.18％．개성적Sn-Co/C구유경고적리리자확산계수，제고료합금재료적충방전성능．
Sn-Co/C composite material was prepared by carbonization reduction process firstly , then the composite was treated by high energy ball milling .The structural , morphological features ,and electrochemical properties of the Sn-Co/C composite were characterized by powder X-ray diffraction,SEM,AC impedance analysis.The experimental results revealed that after ball milling ,the morphological of the Sn-Co/C composite became amorphous .In first cy-cle ,the Sn-Co/C composite electrode showed a large discharge capacity of 1 098.9 mAhg -1 , and a large charge ca-pacity of 771.3 mAhg -1 ,and showed high capacity 425.1 mAhg -1 after 100 cycles.The average rate of capacity fading was 0.18%after being stable .The modified Sn-Co/C showed higher lithium-ion diffusion coefficient ,which will help improve the electrochemical properties of the alloy material .