新型复合共沉淀法制备高能量/高功率型锂离子二次电池用5 V正极材料LiNi0.5Mn1.5O4及其电化学性能

引用本文: 朱智, 其鲁, 李卫, 廖细英. 新型复合共沉淀法制备高能量/高功率型锂离子二次电池用5 V正极材料LiNi_0.5Mn_1.5O₄及其电化学性能[J]. 物理化学学报, 2014, 30(4): 669-676. doi: 10.3866/PKU.WHXB201402102 shu

Citation: ZHU Zhi, QI Lu, LI Wei, LIAO Xi-Ying. Preparation and Electrochemical Performance of 5 V LiNi_0.5Mn_1.5O₄ Cathode Material by the Composite Co-Precipitation Method for High Energy/High Power Lithium Ion Secondary Batteries[J]. Acta Physico-Chimica Sinica, 2014, 30(4): 669-676. doi: 10.3866/PKU.WHXB201402102 shu

新型复合共沉淀法制备高能量/高功率型锂离子二次电池用5 V正极材料LiNi_0.5Mn_1.5O₄及其电化学性能

朱智 ^1, ,
其鲁 ^1, ,
李卫 ^2,3, ,
廖细英 ^3,

摘要:

在传统固相法的基础上开发了新型复合共沉淀法制备LiNi_0.5Mn_1.5O₄材料. 新型复合共沉淀法采用（NH₄）₂CO₃和（NH₄）₂C₂O₄共同作为沉淀剂，通过控制共沉淀反应条件，得到了具有均匀球形形貌的沉淀物颗粒. 再通过与饱和氢氧化锂溶液的水热反应及高温反应，最终制备出具有球形次级形貌和纯相尖晶石结构的LiNi_0.5Mn_1.5O₄材料. 电化学测试表明，制备的LiNi_0.5Mn_1.5O₄具有优异的电化学性能，其初始容量达到了141.4mAh·g^-1. 在0.3C、1C和3C倍率下经过200 次循环后的容量分别为136.0 mAh·g^-1 （96.3%）、128.6 mAh·g^-1（94.4%）和113.9 mAh·g^-1 （91.1%）. 通过高温反应及特殊的冷却处理，LiNi_0.5Mn_1.5O₄在4.0 V低压区平台的容量损失得到了有效抑制. 更重要的是，通过控制合成过程中的关键步骤，可实现半定量化控制材料结构中的原子有序排布程度，进而得到具有高能量密度和高功率密度的两种LiNi_0.5Mn_1.5O₄材料，其能量密度和功率密度分别达到了648.6 mWh·g^-1和7000 mW·g^-1以上.

关键词:

English

Preparation and Electrochemical Performance of 5 V LiNi_0.5Mn_1.5O₄ Cathode Material by the Composite Co-Precipitation Method for High Energy/High Power Lithium Ion Secondary Batteries

ZHU Zhi ^1, ,
QI Lu ^1, ,
LI Wei ^2,3, ,
LIAO Xi-Ying ^3,

1.
1 College of Chemistry and Molecular Engineering, Peking University, Beijing 100190, P. R. China;
2 School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083;
3 SYN Chemicals & Technology (Beijing) Co. Ltd., Beijing 100094, P. R. China
Received Date: 19 November 2013
Available Online: 31 March 2014

Abstract:

This research developed a novel composite co-precipitation method to prepare high performance LiNi_0.5Mn_1.5O₄ based on a traditional solid-state method. Ammonium oxalate/ammonium carbonate was used as a composite precipitator to deposit Ni/Mn ions. Combined with a facile hydrothermal treatment, stoichiometric LiNi_0.5Mn_1.5O₄ was obtained with a pure spinel structure and spherical hierarchical morphology. Electrochemical measurements indicate that the as-prepared LiNi_0.5Mn_1.5O₄ delivers a high capacity of 141.4 mAh·g^-1 and after 200 cycles under 0.3C, 1C, and 3C, the materials retained their capacities up to 96.3%, 94.4%, and 91.1%, respectively. Additionally, the capacity upon exposure to a low voltage of 4.0 V was efficiently eliminated by heat treatment and by a particular cooling process. Furthermore, the LiNi_0.5Mn_1.5O₄ materials with high energy and high power performances of 648.6 mWh·g^-1 and 7000mW·g^-1 were obtained because of different cation ordering.

Key words:

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沈阳化工大学材料科学与工程学院沈阳 110142

新型复合共沉淀法制备高能量/高功率型锂离子二次电池用5 V正极材料LiNi_0.5Mn_1.5O₄及其电化学性能

English

Preparation and Electrochemical Performance of 5 V LiNi_0.5Mn_1.5O₄ Cathode Material by the Composite Co-Precipitation Method for High Energy/High Power Lithium Ion Secondary Batteries

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