阳极
电化学
非阻塞I/O
阴极
材料科学
电池(电)
锂(药物)
锂离子电池
离子
磷酸钒锂电池
无机化学
化学工程
化学
电极
物理化学
催化作用
内分泌学
工程类
功率(物理)
有机化学
物理
医学
量子力学
生物化学
作者
Shuangying Wei,Daniele Di Lecce,Rosaria Brescia,Giammarino Pugliese,Paul R. Shearing,Jusef Hassoun
标识
DOI:10.1016/j.jallcom.2020.155365
摘要
Abstract A NiO@C composite anode is prepared through an alternative synthesis route involving precipitation of a carbon precursor on NiO nanopowder, annealing under argon to form a Ni core, and oxidation at moderate temperature to get metal oxide particles whilst retaining carbon and metallic Ni in traces. The electrode reversibly reacts in lithium cells by the typical conversion process occurring in a wide potential range with the main electrochemical activity at 1.3 V vs. Li+/Li during discharge and at 2.2 V vs. Li+/Li during charge. The NiO@C material exhibits highly improved behavior in a lithium half-cell compared to bare NiO due to faster electrode kinetics and superior stability over electrochemical displacement, leading to a reversible capacity approaching 800 mAh g−1, much enhanced cycle life and promising rate capability. The applicability of the NiO@C anode is further investigated in a lithium-ion NiO@C/LiNi⅓Co⅓Mn⅓O2 cell, which operates at about 2.5 V delivering about 160 mAh g−1 with respect to the cathode mass. The cell exhibits stable response upon 80 cycles at a C/2 rate with coulombic efficiency ranging from 97% to 99%.
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