{"title":"超低剂量 Nb2O5 涂层促进了富镍氧化物阴极的电化学动力学和速率能力","authors":"Xiaozheng Zhou, Anqi Chen, Chengwei Lu, Ruojian Ma, Ruyi Fang, Yongping Gan, Guoguang Wang, Jianping Xu, Qinzhong Mao, Xiaoxiao Lu, Xinhui Xia, Yang Xia","doi":"10.1007/s10008-024-06023-0","DOIUrl":null,"url":null,"abstract":"<p>LiNi<sub>0.8</sub>Co<sub>0.1</sub>Mn<sub>0.1</sub>O<sub>2</sub> (NCM811) cathode material is prized in the electric vehicles (EVs) industry for its high capacity and voltage during operation. However, the high residual alkali content and inferior ionic conductivity of Ni‑rich cathode materials are the intractable obstacles to the large-scale commercial application for a long time. Herein, a feasible Nb<sub>2</sub>O<sub>5</sub> coating strategy is proposed to eliminate residual alkali along with constructing high Li<sup>+</sup> conductive coating layer on NCM811 cathode materials surface. Impressively, 0.3% Nb<sub>2</sub>O<sub>5</sub>‑coated NCM811 cathode exhibits superior rate capability (146.4 mA h g<sup>−1</sup>@400 mA g<sup>−1</sup>) and remarkable rate cyclic stability (188.5 mA h g<sup>−1</sup> after 100 cycles with capacity retention of 94.8%). On the one hand, a small quantity of Nb<sub>2</sub>O<sub>5</sub> coating on NCM811 surface can react with surface residual alkali to promote the transformation of low electronic conductivity surface residual alkali into the Li<sup>+</sup> conductor of LiNbO<sub>3</sub> coating layer, enhancing Li<sup>+</sup> de-intercalation kinetics and rate performance. On the other hand, excessive Nb<sub>2</sub>O<sub>5</sub> coating may introduce Nb<sup>5+</sup> into the lattice of NCM811, acting as pivotal components within the Li<sup>+</sup> layer, which effectively suppresses the H2 ↔ H3 phase transition, contributing to long-term cyclic stability. This work paves a new path for the rational design and facile coating of Ni-rich oxide cathode materials with reinforced structure stability and boosted rate capability in high‑energy‑density lithium-ion batteries.</p>","PeriodicalId":665,"journal":{"name":"Journal of Solid State Electrochemistry","volume":"4 1","pages":""},"PeriodicalIF":2.6000,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Ultra‑low‑dose Nb2O5 coating promotes electrochemical kinetics and rate capability of Ni-rich oxide cathode\",\"authors\":\"Xiaozheng Zhou, Anqi Chen, Chengwei Lu, Ruojian Ma, Ruyi Fang, Yongping Gan, Guoguang Wang, Jianping Xu, Qinzhong Mao, Xiaoxiao Lu, Xinhui Xia, Yang Xia\",\"doi\":\"10.1007/s10008-024-06023-0\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>LiNi<sub>0.8</sub>Co<sub>0.1</sub>Mn<sub>0.1</sub>O<sub>2</sub> (NCM811) cathode material is prized in the electric vehicles (EVs) industry for its high capacity and voltage during operation. However, the high residual alkali content and inferior ionic conductivity of Ni‑rich cathode materials are the intractable obstacles to the large-scale commercial application for a long time. Herein, a feasible Nb<sub>2</sub>O<sub>5</sub> coating strategy is proposed to eliminate residual alkali along with constructing high Li<sup>+</sup> conductive coating layer on NCM811 cathode materials surface. Impressively, 0.3% Nb<sub>2</sub>O<sub>5</sub>‑coated NCM811 cathode exhibits superior rate capability (146.4 mA h g<sup>−1</sup>@400 mA g<sup>−1</sup>) and remarkable rate cyclic stability (188.5 mA h g<sup>−1</sup> after 100 cycles with capacity retention of 94.8%). On the one hand, a small quantity of Nb<sub>2</sub>O<sub>5</sub> coating on NCM811 surface can react with surface residual alkali to promote the transformation of low electronic conductivity surface residual alkali into the Li<sup>+</sup> conductor of LiNbO<sub>3</sub> coating layer, enhancing Li<sup>+</sup> de-intercalation kinetics and rate performance. On the other hand, excessive Nb<sub>2</sub>O<sub>5</sub> coating may introduce Nb<sup>5+</sup> into the lattice of NCM811, acting as pivotal components within the Li<sup>+</sup> layer, which effectively suppresses the H2 ↔ H3 phase transition, contributing to long-term cyclic stability. 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引用次数: 0
摘要
LiNi0.8Co0.1Mn0.1O2 (NCM811)阴极材料在电动汽车(EV)行业中因其高容量和高电压而备受青睐。然而,长期以来,富镍阴极材料的高残碱含量和较差的离子导电性是其大规模商业化应用的难以逾越的障碍。本文提出了一种可行的 Nb2O5 涂层策略,以消除残碱,同时在 NCM811 阴极材料表面构建高 Li+ 导电涂层。令人印象深刻的是,0.3% Nb2O5 涂层 NCM811 阴极表现出卓越的速率能力(146.4 mA h g-1@400 mA g-1)和显著的速率循环稳定性(100 个循环后 188.5 mA h g-1,容量保持率 94.8%)。一方面,NCM811 表面的少量 Nb2O5 涂层可与表面残碱发生反应,促进低电子传导性的表面残碱转化为 LiNbO3 涂层的 Li+ 导体,从而提高 Li+ 去闰动力学和速率性能。另一方面,过量的 Nb2O5 涂层可能会在 NCM811 晶格中引入 Nb5+,使其成为 Li+ 层中的关键成分,从而有效抑制 H2 ↔ H3 相变,促进长期循环稳定性。这项工作为合理设计和简便涂覆富镍氧化物正极材料、增强结构稳定性和提高高能量密度锂离子电池的速率能力铺平了新的道路。
Ultra‑low‑dose Nb2O5 coating promotes electrochemical kinetics and rate capability of Ni-rich oxide cathode
LiNi0.8Co0.1Mn0.1O2 (NCM811) cathode material is prized in the electric vehicles (EVs) industry for its high capacity and voltage during operation. However, the high residual alkali content and inferior ionic conductivity of Ni‑rich cathode materials are the intractable obstacles to the large-scale commercial application for a long time. Herein, a feasible Nb2O5 coating strategy is proposed to eliminate residual alkali along with constructing high Li+ conductive coating layer on NCM811 cathode materials surface. Impressively, 0.3% Nb2O5‑coated NCM811 cathode exhibits superior rate capability (146.4 mA h g−1@400 mA g−1) and remarkable rate cyclic stability (188.5 mA h g−1 after 100 cycles with capacity retention of 94.8%). On the one hand, a small quantity of Nb2O5 coating on NCM811 surface can react with surface residual alkali to promote the transformation of low electronic conductivity surface residual alkali into the Li+ conductor of LiNbO3 coating layer, enhancing Li+ de-intercalation kinetics and rate performance. On the other hand, excessive Nb2O5 coating may introduce Nb5+ into the lattice of NCM811, acting as pivotal components within the Li+ layer, which effectively suppresses the H2 ↔ H3 phase transition, contributing to long-term cyclic stability. This work paves a new path for the rational design and facile coating of Ni-rich oxide cathode materials with reinforced structure stability and boosted rate capability in high‑energy‑density lithium-ion batteries.
期刊介绍:
The Journal of Solid State Electrochemistry is devoted to all aspects of solid-state chemistry and solid-state physics in electrochemistry.
The Journal of Solid State Electrochemistry publishes papers on all aspects of electrochemistry of solid compounds, including experimental and theoretical, basic and applied work. It equally publishes papers on the thermodynamics and kinetics of electrochemical reactions if at least one actively participating phase is solid. Also of interest are articles on the transport of ions and electrons in solids whenever these processes are relevant to electrochemical reactions and on the use of solid-state electrochemical reactions in the analysis of solids and their surfaces.
The journal covers solid-state electrochemistry and focusses on the following fields: mechanisms of solid-state electrochemical reactions, semiconductor electrochemistry, electrochemical batteries, accumulators and fuel cells, electrochemical mineral leaching, galvanic metal plating, electrochemical potential memory devices, solid-state electrochemical sensors, ion and electron transport in solid materials and polymers, electrocatalysis, photoelectrochemistry, corrosion of solid materials, solid-state electroanalysis, electrochemical machining of materials, electrochromism and electrochromic devices, new electrochemical solid-state synthesis.
The Journal of Solid State Electrochemistry makes the professional in research and industry aware of this swift progress and its importance for future developments and success in the above-mentioned fields.