Multi-heteroatom doped carbon coated Na3V2(PO4)3 derived from ionic liquids†,Dalton Transactions

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Multi-heteroatom doped carbon coated Na3V2(PO4)3 derived from ionic liquids†
Dalton Transactions ( IF 3.5 ) Pub Date : 2018-02-13 00:00:00 , DOI: 10.1039/c8dt00062j
Lu-Lu Zhang _{1,

2,

3,

4,

5} , Ying-Xian Zhou _{1,

2,

3,

4,

5} , Tao Li _{1,

2,

3,

4,

5} , Di Ma _{1,

2,

3,

4,

5} , Xue-Lin Yang _{1,

2,

3,

4,

5}

Affiliation

Multi-heteroatom (N, S and F) doped carbon coated Na₃V₂(PO₄)₃ (labeled as NVP/C-ILs) derived from an ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([EMIM]TF2N) has been successfully fabricated. The as-prepared Na₃V₂(PO₄)₃ particles are well dispersed and closely coated with a multi-heteroatom (N, S and F) doped carbon layer. As a cathode for sodium-ion batteries, the NVP/C-ILs electrode exhibits high reversible specific capacity (117.5 mA h g⁻¹ at 1C), superior rate performance (93.4 mA h g⁻¹ at 10C) and excellent cycling stability (∼95% capacity retention ratio at 10C over 1000 cycles). The impressive electrochemical performance of NVP/C-ILs can be attributed to effectively conductive networks for electrons and Na⁺ ions induced by a joint effect of N, S and F doping on carbon. The use of multi-heteroatom doped carbon coated Na₃V₂(PO₄)₃ provides a facile and effective strategy for the fabrication of high performance electrode materials with low intrinsic electrical conductivity.

中文翻译：

源自离子液体的多杂原子掺杂碳包覆的Na ₃ V ₂（PO ₄）₃†

多杂原子（N，S和F）掺杂的碳包覆的Na ₃ V ₂（PO ₄）₃（标记为NVP / C-ILs）衍生自离子液体1-乙基-3-甲基咪唑双（三氟甲基磺酰基）酰亚胺（[[已成功制造出EMIM] TF2N）。所制备的Na ₃ V ₂（PO ₄）₃颗粒分散良好，并用多杂原子（N，S和F）掺杂的碳层紧密涂覆。作为钠离子电池的阴极，NVP / C-ILs电极表现出高的可逆比容量（在1C时为117.5 mA hg ^-1），出色的倍率性能（93.4 mA hg ^-1在10°C下保持良好的循环稳定性（在1000个循环中10°C时，容量保持率约为95％）。NVP / C-ILs令人印象深刻的电化学性能可归因于N，S和F掺杂对碳的联合效应所诱导的电子和Na ⁺离子的有效导电网络。多杂原子掺杂的碳包覆的Na ₃ V ₂（PO ₄）_3的使用为制造具有低固有电导率的高性能电极材料提供了一种简便而有效的策略。

更新日期：2018-02-13

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