材料科学
化学工程
电化学
碳纳米管
复合数
聚合
电解质
阳极
电导率
水溶液
纳米技术
电极
聚合物
复合材料
有机化学
化学
物理化学
工程类
作者
Zhen Jiang,Yuehua Li,Chao Han,Xianwen Wu,Zhangxing He,Jing Zhu,Wei Meng,Lei Dai
标识
DOI:10.1016/j.ceramint.2019.10.164
摘要
NaTi2(PO4)3 (NTP) anode with NASICON structure presents broad prospects for aqueous lithium ion battery. Nevertheless, its intrinsic poor conductivity and structure stability in aqueous solution restrict performance of materials. Herein, we used dopamine hydrochloride to fabricate N-doped carbon encapsulated NaTi2(PO4)3 nanosphere via in situ dopamine polymerization under different solution environments. Composites show obvious improvement on electrochemical performance compared with NTP. Additionally, utilization of Tris-buffer solution endows N-doped carbon encapsulated NaTi2(PO4)3 nanosphere with superior performance to those of composites acquired in other solution environments. Among all samples obtained in Tris-buffer, N-doped carbon encapsulated NaTi2(PO4)3 nanosphere with proper carbon layer shows superb electrochemical performance with discharge capacities of 127.5, 113.8, and 90.9 mA h g−1 at 0.2, 3.0, and 15C, respectively. Superb property may be due to the unique nanosphere structure. Nanospheres with better dispersion can shorten migration path of Li ions. Encapsulation of N-doped carbon layer improves stability in aqueous electrolyte and ameliorates electronic conductivity of materials. N doping enhances hydrophilicity and electronic conductivity, and also forms lots of defects on carbon layer, which contributes to Li ion intercalation/deintercalation. This work reveals that the combination of nanosphere and N-doped carbon layer offers a promising method to raise electrochemical performances of NaTi2(PO4)3.
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