Raising Lithium Storage Performances of NaTi2(PO4)3 by Nitrogen and Sulfur Dual-Doped Carbon Layer
Raising Lithium Storage Performances of NaTi2(PO4)3 by Nitrogen and Sulfur Dual-Doped Carbon Layer
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DOI：
10.1149/1945-7111/ab6c5c
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发表时间：
2020-01-31
影响因子：
3.9
通讯作者：
Wang, Ling
中科院分区：
文献类型：
--
作者：
Jiang, Zhen;Li, Yuehua;Wang, Ling
NaTi 2（PO 4）（3）作为负极材料，由于其开放的骨架结构和良好的稳定性，在水溶液锂离子电池中具有很好的应用前景。本文采用溶胶-凝胶法制备了N/S双掺杂碳包覆NaTi 2（PO 4）（3）纳米颗粒（NTP@CNS）作为水溶液锂离子电池负极材料。NTP@CNS因其独特的碳层掺杂氮和硫而表现出优异的电化学性能。其在0.5、7.0和15 C下的放电容量分别为119.4、101.5和84.5 mAh g（-1），与原始样品相比分别增加了10、30.5和51.2 mAh g（-1）。此外，NTP@CNS在6 ℃下1000次循环后表现出83.4%的容量保持率。NTP@CNS的优异性能是由于N/S双掺杂提高了样品的电子电导率，同时也在电极表面形成了大量的缺陷。这可以加速Li离子嵌入/脱嵌和电子转移。N/S双掺杂碳包覆NaTi_2（PO_4）（3）为改善阳极的电化学性能提供了一种有效和有希望的策略。(C)2020年电化学学会（“ECS”）。由IOP Publishing Limited代表ECS出版。
NaTi2(PO4)(3) as anode exhibits promising prospects in aqueous lithium ion battery due to the open frame and good stability. In this paper, N/S dual-doped carbon encapsulated NaTi2(PO4)(3) nanoparticle (NTP@CNS) as anode for aqueous lithium ion battery has been successfully fabricated through sol-gel method followed by calcination treatment. Benefiting from the unique carbon layer doped nitrogen and sulfur, NTP@CNS shows excellent electrochemical property. It delivers discharge capacity of 119.4, 101.5, and 84.5 mAh g(-1) at 0.5, 7.0, and 15 C, separately, increasing by 10, 30.5, and 51.2 mAh g(-1) compared to original sample. Moreover, NTP@CNS demonstrates capacity retention of 83.4% after 1000 cycles at 6 C. The excellent property of NTP@CNS is because N/S dual-doping raises electronic conductivity of the sample, and also forms a lot of defects on the electrode surface. This can accelerate Li ion intercalation/deintercalation and electron transfer. N/S dual-doped carbon encapsulation for NaTi2(PO4)(3) offers an efficacious and hopeful strategy to ameliorate electrochemical performance of anode. (C) 2020 The Electrochemical Society ("ECS"). Published on behalf of ECS by IOP Publishing Limited.