NiS Nanorods as Cathode Materials for All‐Solid‐State Lithium Batteries with Excellent Rate Capability and Cycling Stability
NiS Nanorods as Cathode Materials for All‐Solid‐State Lithium Batteries with Excellent Rate Capability and Cycling Stability
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DOI：
10.1002/celc.201500570
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发表时间：
2016-05
期刊：
影响因子：
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通讯作者：
P. Long;Qiang Xu;Gang. Peng;X. Yao;Xiaoxiong Xu
中科院分区：
文献类型：
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作者：
P. Long;Qiang Xu;Gang. Peng;X. Yao;Xiaoxiong Xu
由于固体材料中锂离子迁移动力学低，电极与电解质之间界面相容性差，全固态锂电池的倍率性能和循环稳定性是最大的挑战。本文首次将一维纳米结构的NiS和金属锂应用于Li/70%Li_2S-29%P_2 O_5 - 1%P_2 O_5/Li_（10）GeP_2S_（12）/NiS全固态锂电池中，表现出优异的倍率性能和循环稳定性。采用溶剂热法可控制备了直径为20-50 nm、长度为2-3 μm的NiS纳米棒。电化学性能测试表明，NiS纳米棒电极在100、250和500 mA g−1的电流密度下的可逆放电容量分别高达670、401和299 mAh g − 1。此外，它还表现出优异的循环稳定性，在250和500 mA g−1的电流密度下，100次循环后的可逆放电容量分别高达338和243 mAh g − 1。通过结合循环伏安法和非原位XRD测量，详细揭示了NiS纳米棒在全固态锂电池中的电化学反应机理，显示出与使用液体电解质的传统锂离子电池几乎相同的可逆转化反应。
Rate capability and cycling stability are the great challenges of all-solid-state lithium batteries, owing to the low lithium ion transfer kinetics in solid materials and poor interfacial compatibility between electrodes and electrolytes. In this work, one-dimensional nanostructured NiS and lithium metal are firstly employed in Li/70 % Li2S–29 % P2O5–1 % P2O5/Li10GeP2S12/NiS all-solid-state lithium batteries, exhibiting excellent rate capability and cycling stability. NiS nanorods, with a diameter of 20–50 nm and length of 2–3 μm, are prepared in a controllable manner by using a solvothermal method. Electrochemical performance measurements show that the reversible discharge capacities of NiS nanorod electrodes can be as high as 670, 401, and 299 mAh g−1 at the current densities of 100, 250, and 500 mA g−1, respectively. Also, it displays excellent cycling stability, showing reversible discharge capacities up to 338 and 243 mAh g−1 after 100 cycles at current densities of 250 and 500 mA g−1, respectively. The electrochemical reaction mechanism of the NiS nanorods in all-solid-state lithium batteries is revealed by combining cyclic voltammetry and ex situ XRD measurements in detail, showing a reversible conversion reaction that is almost identical with that in the traditional lithium-ion batteries that utilize liquid electrolytes.