### 三维多孔集流体改善NiO电极的储锂特性

1. 长安大学材料科学与工程学院 西安 710061
• 投稿日期:2019-02-03 发布日期:2019-05-21
• 通讯作者: 樊小勇, 李东林 E-mail:xyfan@chd.edu.cn;dlli@chd.edu.cn
• 基金资助:

项目受国家自然科学基金面上项目（No.21473014）、中国博士后基金面上项目（No.2016M590908）和长安大学卓越青年基金（No.310831153505）资助.

### Three-dimensional Porous Current Collector for Lithium Storage Enhancement of NiO Electrode

Wang Shan, Fan Xiaoyong, Cui Yu, Gou Lei, Wang Xingang, Li Donglin

1. School of Materials Science and Engineering, Chang'an University, Xi'an 710061, China
• Received:2019-02-03 Published:2019-05-21
• Supported by:

Project supported by the National Natural Science Foundation of China (No. 21473014), the China Postdoctoral Science Foundation (No. 2016M590908) and the Special Fund for Basic Scientific Research of Central Colleges, Chang'an University, China (Grant No. 310831153505).

Three-dimensional (3D) porous metals have been applied as current collector to improve the cycle stability and high-rate capacities of lithium-ion battery due to they can accommodate volumetric changes of electrodes during lithium storage, and provide rapid transfer channels for lithium ions. NiO has attracted more and more attention due to its high theoretical specific capacity as anode of lithium-ion battery. However its low electrical conductivity and large volumetric changes during electrochemical cycling result in poor cyclability and low high-rate capacity. Besides, the large first irreversible capacity causing from the low reaction activity between the first lithiation products Ni0 and Li2O, hinders its commercial application. In this work, we produce 3D porous Cu with interconnected pores (ca. 5 μm) by a facile and scalable electroless plating method and investigate its role on electrochemical storage improvement for NiO electrode. NiO@3D porous Cu is produced by electrodepositing Ni(OH)2 film coupled with sequential high temperature with 3D porous Cu as the substrate. The NiO film deposited on the 3D porous Cu has mesoporous structure. This unique architecture can provide rapid transfer channels for lithium-ion battery and free place for accommodating volumetric changes of NiO during electrochemical cycling, meanwhile increases reactive points for Ni0 and Li2O. Thus, this electrode demonstrates excellent high-rate capacity and high first columbic efficiency. The first discharge and charge capacities at 200 mA·g-1 are 1522.3 and 1230.2 mAh·g-1 respectively with high columbic efficiency of 80.8%. The same electrode shows high capacity of 578 mAh·g-1 at high current density of 20 A·g-1, which is 48.8% of that at 0.2 A·g-1. The electrochemical impedance spectra (EIS) demonstrate the NiO@3D porous Cu electrode has smaller charge transfer resistance and large Li-ion diffusion efficiency compared with NiO@Cu foil. The SEM images show that the NiO@3D porous Cu electrode suffered 100 cycles remains well 3D porous structure. A full cell is assembled using NiO@3D porous Cu as negative electrode and LiNi1/3Co1/3Mn1/3O2 as positive electrode. The full cell delivers first charge and discharge capacities of 1514 and 1060 mAh·g-1 respectively at 0.2 A·g-1 (based on NiO) with a coulomb efficiency of 70%, a first discharge capacity of 873 mAh·g-1 at 1.0 A·g-1 with 709 mAh·g-1 remained after 100 cycles (the retention is 81%). This work may offer an effective method for lithium storage enhancement of transition metal oxides.