Synthesis and Electrochemical Reaction of a Pitch Carbon-Coated Zinc Vanadium Oxide Anode with Excellent Electrochemical Performance for Rechargeable Lithium Batteries,ACS Sustainable Chemistry & Engineering

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Synthesis and Electrochemical Reaction of a Pitch Carbon-Coated Zinc Vanadium Oxide Anode with Excellent Electrochemical Performance for Rechargeable Lithium Batteries
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-01-23 , DOI: 10.1021/acssuschemeng.9b06229
Jae Hyeon Jo ₁ , Ji Ung Choi ₁ , Hee Jae Kim ₁ , Hitoshi Yashiro ₂ , Seung-Taek Myung ₁

Affiliation

We report on the synthesis and electrochemical reactions of a carbon-coated Zn₃V₂O₈ (C-ZVO) anode prepared using a one-step coating process. The anode delivers a high charge capacity of 757 mA h g^–1 at 0.1 A g^–1 with excellent long-term life of 96%, delivering a capacity of approximately 735 mA h g^–1 after the 100th cycle. Even at 6.4 A g^–1, the C-ZVO delivers a high charge capacity of 447 mA h g^–1. This extremely improved electrochemical performance is attributed to the high electronic conductivity resulting from the carbon coating, which enables facile electron transfer and simultaneous conversion above 0.8 V: Zn₃V₂O₈ + 7Li⁺ + 7e^– ↔ 3Zn + LiV₂O₅ + 3Li₂O ↔ 3Zn + 2Li⁺ + 2e^– ↔ Li₂Zn₃ on discharge. Furthermore, we apply the C-ZVO material to a full-cell, adopting a Li[Ni_0.6Co_0.2Mn_0.2]O₂ cathode. The full-cell exhibits excellent capacity retention of approximately 80% for 300 cycles and is active even at a rate of 10 C, delivering 70 mA h (g-Li[Ni_0.6Co_0.2Mn_0.2]O₂)⁻¹. A combination of in situ X-ray diffraction, time-of-flight secondary-ion mass spectrometry, and ex situ X-ray absorption spectroscopy analyses verify the excellent lithium storage mechanism of coated Zn₃V₂O₈ on discharge/charge. Our findings provide insight for the development of efficient anodes for lithium-ion batteries.

中文翻译：

沥青可充电锂电池电化学性能优异的碳包覆锌钒氧化物阳极的合成及电化学反应

我们报告了使用一步涂覆工艺制备的碳包覆的Zn ₃ V ₂ O ₈（C-ZVO）阳极的合成和电化学反应。阳极在0.1 A g ^–1时可提供757 mA hg ^–1的高充电容量，具有96％的出色长期寿命，在第100个循环后可提供约735 mA hg ^–1的容量。即使在6.4 A g ^–1时，C-ZVO仍可提供447 mA hg ^–1的高充电容量。电化学性能的极大改善归因于碳涂层带来的高电子电导率，这使得在0.8 V：Zn ₃以上时可以轻松进行电子转移和同时转化V ₂ O ₈ + 7Li ⁺ + 7e ^– 3Zn + LiV ₂ O ₅ + 3Li ₂ O + 3Zn + 2Li ⁺ + 2e ^– Li ₂ Zn ₃在放电时。此外，我们将C-ZVO材料应用于全电池，采用Li [Ni _0.6 Co _0.2 Mn _0.2 ] O ₂阴极。全电池在300个循环中表现出出色的容量保持率，约为80％，即使在10 C的速率下仍具有活性，可提供70 mA h（g-Li [Ni _0.6 Co _0.2 Mn _0.2 ] O ₂）^-1。原位X射线衍射，飞行时间二次离子质谱和非原位X射线吸收光谱分析相结合，证明了涂覆的Zn ₃ V ₂ O ₈在放电/充电过程中具有出色的锂存储机制。我们的发现为开发用于锂离子电池的高效阳极提供了见识。

更新日期：2020-01-23

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