Ultrathin 3 V Spinel Clothed Layered Lithium‐Rich Oxides as Heterostructured Cathode for High‐Energy and High‐Power Li‐ion Batteries†,Chinese Journal of Chemistry

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Ultrathin 3 V Spinel Clothed Layered Lithium‐Rich Oxides as Heterostructured Cathode for High‐Energy and High‐Power Li‐ion Batteries†
Chinese Journal of Chemistry ( IF 5.5 ) Pub Date : 2020-08-26 , DOI: 10.1002/cjoc.202000371
Liqin Dai _{1,

2} , Ning Li _{1,

3} , Lai Chen _{1,

3} , Yuefeng Su _{1,

3} , Cheng‐Meng Chen ₂ , Fangyuan Su ₂ , Liying Bao ₁ , Shi Chen ₁ , Feng Wu _{1,

3}

Affiliation

In an attempt to overcome the drawbacks of high‐capacity layered lithium‐rich cathodes xLi₂MnO₃·(1–x) LiMO₂ (0 < x < 1, M = Mn, Ni, and Co), the spinel clothed layered heterostructured materials, x’Li₄Mn₅O₁₂·(1–x’) Li[Li_0.2Mn_0.55Ni_0.15Co_0.1]O₂ (x’ = 0.01, 0.03, 0.05) have been proposed and synthesized as high‐performance cathode materials for high‐energy and high‐power Li‐ion batteries. Based on the characterizations of X‐ray diffraction (XRD), transmission electron microscopy (TEM), Raman scattering spectroscopy, it is indicated that ultrathin 3 V spinel Li₄Mn₅O₁₂ has been successfully clothed on the layered lithium‐rich cathode. Electrochemical tests demonstrate the sample 0.01Li₄Mn₅O₁₂·0.99 Li[Li_0.2Mn_0.55Ni_0.15Co_0.1]O₂ with an ultrathin clothing layer of spinel phase, exhibits the highest reversible capacity of 289.4 mAh g^–1 and maintains 259.8 mAh g^–1 after 80 cycles at 0.1 C rate. Meanwhile, it delivers outstanding rate discharge capacities of 229.4 mAh g^–1 at 1 C, 216.8 mAh g^–1 at 2 C and 184.4 mAh g^–1 at 5 C as well as alleviated voltage fade. It is believed the ultrathin clothing spinel layer plays a vital role in the modification of the materials kinetics, and structural and electrochemical stability of the heterostructured cathode.

中文翻译：

超薄3 V尖晶石穿层状富锂锂氧化物作为用于高能和大功率锂离子电池的异质结构阴极†

为了克服高容量分层富锂阴极x Li ₂ MnO ₃ ·（1- x）LiMO ₂（0 < x <1，M = Mn，Ni和Co）的缺点，对尖晶石进行了分层异质材料，X '栗₄的Mn ₅ ø ₁₂ ·（1- X '）的Li [李_0.2锰_0.55镍_0.15钴_0.1 ] O ₂（X（= 0.01，0.03，0.05）已被提出并合成为用于高能量和高功率锂离子电池的高性能阴极材料。基于X射线衍射（XRD），透射电子显微镜（TEM）和拉曼散射光谱的表征，表明超薄3 V尖晶石Li ₄ Mn ₅ O ₁₂已经成功地涂覆在层状富锂阴极上。电化学测试表明样品0.01Li ₄ Mn ₅ O ₁₂ ·0.99 Li [Li _0.2 Mn _0.55 Ni _0.15 Co _0.1 ] O ₂具有尖晶石相的超薄衣物层，在0.1 C速率下经过80次循环后，可逆容量最高，为289.4 mAh g ^–1，并保持259.8 mAh g ^–1。同时，它具有出色的倍率放电容量，在1 C时为229.4 mAh g ^–1，在2 C时为216.8 mAh g ^–1，在5 C时为184.4 mAh g ^–1，并减轻了电压衰减。据信，超薄服装尖晶石层在改变材料动力学，异质结构阴极的结构和电化学稳定性方面起着至关重要的作用。

更新日期：2020-08-26

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