An Effective Method to Reduce Residual Lithium on LiNi0.8Co0.1Mn0.1O2 Cathode Material Using a Reducing Agent

2021 ◽  
Vol 21 (3) ◽  
pp. 2019-2023
Author(s):  
Ji-Woong Shin ◽  
Seon-Jin Lee ◽  
Sang-Yong Oh ◽  
Yun-Chae Nam ◽  
Jong-Tae Son
Keyword(s):  
Cathode Material ◽  
Cathode Materials ◽  
Coulombic Efficiency ◽  
High Capacity ◽  
Lithium Ion ◽  
Side Reaction ◽  
Reducing Agent ◽  
Cycle Performance ◽  
Temperature Cycle ◽  
Material Surface

Among the various cathode materials used in LIBs (Lithium ion batteries), nickel rich cathode materials have attracted an increasing amount of interest due to their high capacity, relatively low cost, and low toxicity when compared to LiCoO2. However, these materials always contain a large amount of residual lithium compounds such as LiOH and Li2CO3. The presence of lithium residues is undesirable because the oxidation of these compounds results in the formation of Li2O and CO2 gas at higher voltages, which lowers the coulombic efficiency between the charge and discharge capacities during cycling. In this study, using LiNi0.8Co0.1Mn0.1O2 as a starting material, a surface-modified cathode material was obtained by using reducing agent. The reducing agent not only plays the role of reducing the oxide conversion energy but also suppresses the side reaction with the electrolyte due to the surface modification. Residual lithium present on the cathode material surface was reduced from 11,702 ppm to 8,658 ppm, resulting in improved high temperature cycle performance and impedance characteristics.

scholarly journals Ultrahigh Capacity Retention of Li2ZrO3-Coated Ni-rich LNCM811 Cathode Material through Covalent Interfacial Engineering

2021 ◽  
Author(s):  
Zhangxian Chen ◽  
Qiuge Zhang ◽  
Weijian Tang ◽  
Zhaoguo Wu ◽  
Juxuan Ding ◽  
...  
Keyword(s):  
Cathode Material ◽  
Lithium Ion Battery ◽  
Cathode Materials ◽  
High Capacity ◽  
Lithium Ion ◽  
Side Reaction ◽  
Capacity Retention ◽  
Interfacial Engineering ◽  
Electrochemical Capacity ◽  
Electrochemical Cycling

Nickel-rich LiNiCoMnO (LNCM811) is a promising lithium-ion battery cathode material, whereas the surface-sensitive issues (i.e., side reaction and oxygen loss) occurring on LNCM811 particles significantly degrade their electrochemical capacity retentions. A uniform LiZrO coating layer can effectively mitigate the problem by preventing these issues. Instead of the normally used weak hydrogen-bonding interaction, we present a covalent interfacial engineering for the uniform LiZrO coating on LiNiCoMnO materials. Results indicate that the strong covalent interactions between citric acid and NiCoMn(OH) precursor effectively promote the adsorption of ZrO coating species on NiCoMn(OH) precursor, which is eventually converted to uniform LiZrO coating layers of about 7 nm after thermal annealing. The uniform LiZrO coating endows LNCM811 cathode materials with an exceptionally high capacity retention of 98.7% after 300 cycles at 1 C. This work shows the great potential of covalent interfacial engineering for improving the electrochemical cycling capability of Ni-rich lithium-ion battery cathode materials.

Well-Designed Spherical Morphology Li1.2Mn0.54Ni0.13Co0.13O2 as Superior Cathode Materials for Lithium-Ion Batteries

2016 ◽  
Vol 852 ◽  
pp. 853-857
Author(s):  
Shao Meng Ma ◽  
Xian Hua Hou ◽  
Yan Ling Huang ◽  
Xiao Li Zou ◽  
She Jun Hu
Keyword(s):  
Cathode Material ◽  
Cathode Materials ◽  
Performance Test ◽  
Coulombic Efficiency ◽  
Lithium Ion ◽  
Constant Current ◽  
Precipitation Method ◽  
One Pot ◽  
Constant Current Density ◽  
High Discharge Capacity

Li-rich layered cathode materials with an average composition of Li1.2Mn0.54Ni0.13Co0.13O2 have been successfully synthesized via one-pot facile co-precipitation method. The spherical cathode material and the unconsolidated shape one are obtained by optimizing the experimental condition. The results of electrochemical performance test expose that the spherical cathode material exhibits more excellent cycle ability and rate performance than the unconsolidated one. The initial charge-discharge specific capacities of the spherical cathode are approximately 323.4 mAh g-1 and 266.4 mAh g-1, respectively, showing an initial coulombic efficiency of 82.4%. A high discharge capacity of 241.1 mAh g-1 is maintained with the capacity retention of 90.5% after 50 cycles at a constant current density of 50 mA g-1 (1 C=250 mAh g-1).

LiNi0.90Co0.07Mg0.03O2 cathode materials with Mg-concentration gradient for rechargeable lithium-ion batteries

2019 ◽  
Vol 7 (36) ◽  
pp. 20958-20964 ◽  
Author(s):  
Yudong Zhang ◽  
Hang Li ◽  
Junxiang Liu ◽  
Jicheng Zhang ◽  
Fangyi Cheng ◽  
...  
Keyword(s):  
Cathode Material ◽  
Lithium Ion Batteries ◽  
Cathode Materials ◽  
Concentration Gradient ◽  
High Capacity ◽  
Rate Capability ◽  
Lithium Ion ◽  
High Rate ◽  
Gradient Structure ◽  
High Rate Capability

Nickel-rich LiNi0.90Co0.07Mg0.03O2 cathode material with concentration gradient structure exhibits superior high capacity, high-rate capability and cycling stability.

The Effect of Si Doping or/and Ti Coating on the Electrochemical Properties of Ni-Rich NCA (LiNi0.8Co0.15Al0.05O2) Cathode Material for Lithium-Ion Batteries

2020 ◽  
Vol 12 (10) ◽  
pp. 1581-1585
Author(s):  
Tae-Hyun Ha ◽  
Jun-Seok Park ◽  
Gyu-Bong Cho ◽  
Hyo-Jun Ahn ◽  
Ki-Won Kim ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Cathode Material ◽  
Electrochemical Properties ◽  
Lithium Ion Batteries ◽  
Cathode Materials ◽  
High Capacity ◽  
Lithium Ion ◽  
Physical Contact ◽  
Precipitation Method ◽  
Si Doping

LiNixCoyAlzO2 (NCA) is one of the most promising candidates of cathode material for lithium ion batteries because of its high capacity, energy density, and low cost. However, Ni-rich NCA cathode materials suffer from side reaction (formation of lithium carbonate and hydrogen fluoride attack) between electrolyte and surface of electrode and irreversible phase transition leading to capacity fading and thermal instability. These problems could be improved by coating and doping of transition metal elements. Si doping contributes to stabilization of the unstable R-3m structure, and Ti coating is capable of prohibiting the direct physical contact of electrode with electrolyte. In this work, LiNi0.8Co0.15Al0.05O2 (NCA) cathode materials coated or/and doped by Ti and Si elements were fabricated by co-precipitation method using the ball-milling. The crystal structure, morphology and electrochemical properties are investigated using X-ray diffraction (XRD), scanning electron microscopy (FE-SEM), transmission electron microscopy (FE-TEM), and WBCS3000 (WonA tech Co., Ltd.). The EIS and charge/discharge results of Si doped and Ti coated NCA exhibited the lowest resistance value (147.19 Ω) and capacity retentions of 88% after 100 cycles at 0.5 C.

The use of a single-crystal nickel-rich layered NCM cathode for excellent cycle performance of lithium-ion batteries

2021 ◽  
Vol 45 (7) ◽  
pp. 3652-3659
Author(s):  
Qiankun Guo ◽  
Jili Huang ◽  
Zhao Liang ◽  
Hanna Potapenko ◽  
Miaomiao Zhou ◽  
...  
Keyword(s):  
Single Crystal ◽  
Lithium Ion Batteries ◽  
Electric Vehicles ◽  
Cathode Materials ◽  
High Capacity ◽  
Lithium Ion ◽  
Safety Performance ◽  
Cycle Performance ◽  
Layered Oxides ◽  
New Energy

With the continuous development and progress of new energy electric vehicles, high-capacity nickel-rich layered oxides are widely used in lithium-ion battery cathode materials, and their cycle performance and safety performance have also attracted more and more attention.

Enhancing coulombic efficiency and rate capability of high capacity lithium excess layered oxide cathode material by electrocatalysis of nanogold

RSC Advances ◽  
2016 ◽  
Vol 6 (24) ◽  
pp. 20374-20380 ◽  
Author(s):  
Quanxin Ma ◽  
Deying Mu ◽  
Yuanlong Liu ◽  
Shibo Yin ◽  
Changsong Dai
Keyword(s):  
Cathode Material ◽  
Coulombic Efficiency ◽  
High Capacity ◽  
Rate Capability ◽  
Lithium Ion ◽  
Li Ion Batteries ◽  
Treatment Techniques ◽  
Oxide Cathode ◽  
Li Ion ◽  
Co Precipitation

A lithium-rich cathode material Li1.2Mn0.56Ni0.16Co0.08O2 modified with nanogold (Au@LMNCO) for lithium-ion (Li-ion) batteries was prepared using co-precipitation, solid-state reaction and surface treatment techniques.

Preparation of Precursor of Lini0.5mn1.5o4 with High Density

2012 ◽  
Vol 463-464 ◽  
pp. 881-884 ◽  
Author(s):  
Chao Lin Miao ◽  
Lu Shi ◽  
Gai Rong Chen ◽  
Dong Mei Dai
Keyword(s):  
Cathode Material ◽  
Lithium Ion Battery ◽  
Cathode Materials ◽  
Filter Cake ◽  
Lithium Ion ◽  
High Density ◽  
Cycle Performance ◽  
Precipitation Method ◽  
Tap Density ◽  
The Relationship

The precursor of LiNi0.5MnSubscript text1.5O4cathode material with high density was synthesized by two-dryness co-precipitation method. The optimized parameters were found out by studying the relationship between the density of precursor and the concentration of reactants, the manner of adding agglomerating agent, the remaining water in filter cake and the manner of dryness. The highest density (1.74 g/cm3) of precursor can be achieved under optimized condition: NiSO40.375 mol/L, coagulation agent added with little amount but many times, 28% of water in filter cake and two-step dryness, which is much better than that made by other methods. Our experiment provides a significant reference for the synthesis of excellent-performance cathode materials of lithium-ion battery. LiNi0.5MnSubscript text1.5O4has a good cycle performance, a higher discharge capacity and a discharge platform of 4.7v, so it has become a research focus of 5-voltage cathode materials in the field of lithium ion battery recently.[1-4] However, LiNi0.5Mn1.5O4 prepared by common methods usually has a lower tap volume capacity.[5-9] HiroyuKi Ito[6] reported a continuous fabricated high-density cobalt-manganese-doped nickel hydroxide method with which the density of product was between 1.5-1.91g/cm3, however the used ammonia as a complexation agent in the preparation process not only increased the cost of the preparation, but also led to environmental pollution. Research results show that the cathode material synthesized using high-density precursor has a higher tap density, a larger volume capacity and a good electrochemical performance.[10] In this paper, we find out the optimized parameters of preparation of precursor of LiNi0.5MnSubscript text1.5O4by studying the relationship between the density of precursor and concentration of reactants, the manner of adding agglomerating agent, the remaining water in filter cake and the manner of dryness.

scholarly journals Improvement of long-term cycling performance of high-nickel cathode materials by ZnO coating

2021 ◽  
Vol 10 (1) ◽  
pp. 210-220
Author(s):  
Fangfang Wang ◽  
Ruoyu Hong ◽  
Xuesong Lu ◽  
Huiyong Liu ◽  
Yuan Zhu ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Solid Phase ◽  
Low Cost ◽  
Specific Capacity ◽  
High Capacity ◽  
Lithium Ion ◽  
Side Reaction ◽  
Chemical Route ◽  
High Nickel

Abstract The high-nickel cathode material of LiNi0.8Co0.15Al0.05O2 (LNCA) has a prospective application for lithium-ion batteries due to the high capacity and low cost. However, the side reaction between the electrolyte and the electrode seriously affects the cycling stability of lithium-ion batteries. In this work, Ni2+ preoxidation and the optimization of calcination temperature were carried out to reduce the cation mixing of LNCA, and solid-phase Al-doping improved the uniformity of element distribution and the orderliness of the layered structure. In addition, the surface of LNCA was homogeneously modified with ZnO coating by a facile wet-chemical route. Compared to the pristine LNCA, the optimized ZnO-coated LNCA showed excellent electrochemical performance with the first discharge-specific capacity of 187.5 mA h g−1, and the capacity retention of 91.3% at 0.2C after 100 cycles. The experiment demonstrated that the improved electrochemical performance of ZnO-coated LNCA is assigned to the surface coating of ZnO which protects LNCA from being corroded by the electrolyte during cycling.

Sign in / Sign up

Export Citation Format

Share Document