High-Tap-Density Fe-Doped Nickel Hydroxide with Enhanced Lithium Storage Performance
High-Tap-Density Fe-Doped Nickel Hydroxide with Enhanced Lithium Storage Performance
复制标题
DOI：
10.1021/acsomega.9b00579
复制
发表时间：
2019-04
期刊：
影响因子：
4.1
通讯作者：
Yanwei Li;Renshu Huang;Guanlin Pan;Jinhuan Yao;Z. Zou
中科院分区：
文献类型：
--
作者：
Yanwei Li;Renshu Huang;Guanlin Pan;Jinhuan Yao;Z. Zou
氢氧化镍作为锂离子电池负极材料，因其比容量高、成本低、制备简单而备受关注。但其循环稳定性较差，严重影响了其应用。在此，Fe掺杂的氢氧化镍粉末具有高振实密度（2.16克cm-3）合成通过一个简单的化学共沉淀法。与未掺杂的氢氧化镍相比，这种Fe掺杂的氢氧化镍表现出更好的储锂活性，增强的循环稳定性和倍率性能，以及改善的电化学反应动力学。作为LIB的阳极材料，Fe掺杂的氢氧化镍在30次循环后在200 mA g-1下的放电比容量为1080 mA h g-1，几乎是其两倍。（519 mA h g-1）的未掺杂氢氧化镍;在2000 mA g-1的高电流密度下，Fe掺杂的氢氧化镍显示出661 mA h g-1的比容量，显著高于未掺杂的氢氧化镍（182 mA h g-1）。动力学分析表明，Fe掺杂降低了电化学反应电阻，提高了锂离子在氢氧化镍电极中的扩散系数。
Nickel hydroxide has attracted much attention as an anode material for lithium-ion batteries (LIBs) due to its high specific capacity, low cost, and easy preparation. However, the poor cycling stability greatly hampers its application. Herein, Fe-doped nickel hydroxide powders with a high tap density (2.16 g cm–3) are synthesized by a simple chemical co-precipitation method. Compared to undoped nickel hydroxide, this Fe-doped nickel hydroxide exhibits better lithium storage activity, enhanced cycling stability and rate capability, and improved electrochemical reaction kinetics. As an anode material for LIBs, the Fe-doped nickel hydroxide delivers a specific discharge capacity of 1080 mA h g–1 at 200 mA g–1 after 30 cycles, which is almost twice that (519 mA h g–1) of undoped nickel hydroxide; at a high current density of 2000 mA g–1, Fe-doped nickel hydroxide shows a specific capacity of 661 mA h g–1, significantly higher than that (182 mA h g–1) of undoped nickel hydroxide. Kinetic analysis reveals that Fe doping decreases the electrochemical reaction resistance and improves the lithium ion diffusivity in a nickel hydroxide electrode.