Rational design of a synthetic strategy, carburizing approach and pore-forming pattern to unlock the cycle reversibility and rate capability of micro-agglomerated LiMn0.8Fe0.2PO4 cathode materials

2018 ◽  
Vol 6 (22) ◽  
pp. 10395-10403 ◽  
Author(s):  
Yan Wang ◽  
Cheng-Yu Wu ◽  
Hao Yang ◽  
Jenq-Gong Duh
Keyword(s):  
Solid State ◽  
Cathode Materials ◽  
Rational Design ◽  
Rate Capability ◽  
Solid State Method ◽  
Synthetic Strategy ◽  
State Method ◽  
Carbon Network

A uniform 3D interconnected conductive carbon network modified LiMn0.8Fe0.2PO4 micro agglomerate was synthesized via three-step solid-state method combined with three-step carburizing and two-step pore-forming.

Modification on the structural stability of LiNi0.8Co0.1Mn0.1O2 cathode materials via Pr-doping by the solid-state method

Ionics ◽  
2020 ◽  
Vol 26 (11) ◽  
pp. 5417-5426
Author(s):  
Shenghong Chang ◽  
Yunjiao Li ◽  
Junchao Zheng ◽  
Dianwei Zhang ◽  
Jiachao Yang ◽  
...  
Keyword(s):  
Solid State ◽  
Structural Stability ◽  
Cathode Materials ◽  
Solid State Method ◽  
State Method

ChemInform Abstract: High Performance 5 V LiNi0.5Mn1.5O4Spinel Cathode Materials Synthesized by an Improved Solid-State Method.

ChemInform ◽  
2015 ◽  
Vol 46 (52) ◽  
pp. no-no
Author(s):  
Zhi-Gang Gao ◽  
Kai Sun ◽  
Li-Na Cong ◽  
Yu-Hang Zhang ◽  
Qin Zhao ◽  
...  
Keyword(s):  
Solid State ◽  
Cathode Materials ◽  
High Performance ◽  
Solid State Method ◽  
State Method

The Effect of Thermal Treatment Temperature and Duration on Electrochemistry Performance of LiNi1/3Co1/3Mn1/3O2 Cathode Materials for Lithium-ion Batteries

2018 ◽  
Vol 14 (5) ◽  
pp. 440-447 ◽  
Author(s):  
Gang Sun ◽  
Chenxiao Jia ◽  
Shuanlong Di ◽  
Jianning Zhang ◽  
Qinghua Du ◽  
...  
Keyword(s):  
Solid State ◽  
Thermal Treatment ◽  
Electrochemical Performance ◽  
Cathode Material ◽  
Lithium Ion Batteries ◽  
Cathode Materials ◽  
Raw Materials ◽  
Lithium Ion ◽  
Solid State Method ◽  
State Method

Background: LiNi1/3Mn1/3Co1/3O2 derived from the solid-state method suffers from the problem of significant irreversible charge-discharge behavior. To improve the electrochemical performance of LiNi1/3Mn1/3Co1/3O2, there are several important factors, such as starting raw materials, precursor, preparation method and conditions. In this work, the layered LiNi1/3Mn1/3 Co1/3O2 material was prepared by solid-state reaction. By varying the temperature and duration of synthesis thermal treatment, the greater crystallinity and well-ordered layered LiNi1/3Mn1/3Co1/3O2 cathode material has been successfully synthesized. The structural properties, morphology and electrochemical properties of LiNi1/3Mn1/3Co1/3O2 powders have been investigated in detail. Methods: LiNi1/3Co1/3Mn1/3O2 cathode material was synthesized via a high-temperature solid-state method. Stoichiometric amounts of Ni(CH3COO)2•4H2O, Co(CH3COO)2•4H2O, Mn(CH3COO)2• 4H2O, and Li2CO3 as raw materials were homogenized mixed in a ball mill for 8 h at 240 rpm. By varying the temperature and duration of synthesis thermal treatment, LiNi1/3Co1/3Mn1/3O2 cathode materials with different electrochemistry performance were achieved. (a) The effect of the temperature of synthesis thermal treatment on electrochemistry performance of LiNi1/3Co1/3Mn1/3O2 was explored by calcining the above mixed powder at 800°C, 850°C, 900°C, 950°C, and 1000°C for 12 h in air at a rate of 5°C min-1. Then the target product was prepared at last. The obtained compound was named as N-800, N-850, N-900, N-950 and N-1000, respectively. (b) In order to explore the effect of the duration of synthesis thermal treatment on electrochemistry performance of LiNi1/3 Co1/3Mn1/3O2 cathode material, the above mixed raw materials were calcined at 900°C for 4 h, 8 h, 12 h, 16 h and 20 h in air at a rate of 5°C min-1. The obtained compound was named as N-4, N-8, N- 12, N-16 and N-20, respectively. The N-900 and N-12 are the same sample. Results: The cathode material sintered at 900°C for 12 h revealed the best electrochemical performance, with high-capacity and recyclability compared with other materials. Its initial discharge capacity attains 182.4 mAh g-1 at 0.2 C in the voltage range of 2.5-4.6 V, which can be attributed to its greater crystallinity and well-ordered layered structure. Compared with other studies on lithium-ion batteries given in literature, this work provides a sample, optimal and mild synthetic conditions to synthesize the cathode materials with great electrochemistry performance. Conclusion: A greater crystallinity and well-ordered layered LiNi1/3Mn1/3Co1/3O2 powders had been successfully synthesized by mixing raw materials under various temperatures and duration of synthesis thermal treatment. The XRD results indicated the I(003)/I(104) values of N-900 (N-12) is 1.591 larger than 1.2, which illustrates no undesirable cation mixing to be occurred. In this work, from the results of electrochemical property experiments, it can be indicated that the optimal synthesized conditions are 900°C for 12 h. When the calcination temperature is too low and the calcined time is too short, the material is poorly crystalline and has a poor layer structure. When the calcination temperature is too high and the calcined time is too long, lithium salt is evaporated completely during the calcination process resulting in a poor electrochemistry performance.

Fabrication and Characterisation of La0.6Sr0.4Co0.2Fe0.8O3-δ-SDC Composite Cathode

2011 ◽  
Vol 471-472 ◽  
pp. 268-273 ◽  
Author(s):  
Hamimah Abd Rahman ◽  
Andanastuti Muchtar ◽  
Norhamidi Muhamad ◽  
Huda Abdullah
Keyword(s):  
Crystal Structure ◽  
Fuel Cells ◽  
Solid State ◽  
Cathode Materials ◽  
Composite Cathode ◽  
Doped Ceria ◽  
Composite Powders ◽  
Solid State Method ◽  
Ceramic Electrolyte ◽  
State Method

Composite cathode is a promising material to be used as electrodes in fuel cells. The fabricated composite cathode materials in this study are comprised of a mixture of submicron La0.6Sr0.4Co0.2Fe0.8O3- (LSCF6428) powders with two types of nanoscale ionically conducting ceramic electrolyte materials, samarium-doped ceria (SDC) and SDC-carbonate (SDCc). 30 – 50 wt% of electrolyte materials are added to the LSCF6428 cathode via the solid state method. The composite powders were ball-milled in ethanol and calcined at the temperature range of 800°C to 900°C for 2 hours in air. The composite cathode powders are characterised in terms of morphology and crystal structure. It is found that after calcining, the LSCF and the electrolyte materials retained their original structures as there was no chemical reaction between the two components. In addition, the LSCF-SDC composite cathode powders were found to exhibit a narrower distribution in size compared to the LSCF-SDC carbonate powders.

Morphological evolution of spinel disordered LiNi0.5Mn1.5O4 cathode materials for lithium-ion batteries by modified solid-state method

Ionics ◽  
2018 ◽  
Vol 25 (5) ◽  
pp. 1999-2006 ◽  
Author(s):  
Shiyou Li ◽  
Jing Xie ◽  
Dongni Zhao ◽  
Shan Geng ◽  
Hongliang Li ◽  
...  
Keyword(s):  
Solid State ◽  
Lithium Ion Batteries ◽  
Cathode Materials ◽  
Morphological Evolution ◽  
Lithium Ion ◽  
Solid State Method ◽  
State Method

Effects of Na and V Co-Doping on Electrochemical Performance of LiFePO4/C

2013 ◽  
Vol 724-725 ◽  
pp. 1067-1070
Author(s):  
Ning Yu Gu ◽  
Yang Li ◽  
Chao Li
Keyword(s):  
Solid State ◽  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Cathode Materials ◽  
Lithium Ion ◽  
Electrochemical Performances ◽  
Solid State Method ◽  
Co Doping ◽  
State Method ◽  
Co Doped

To enhance the electrochemical performance of LiFePO4/C, Na and V have been co-doped in cathode material of the lithium ion batteries. A series of Na and V doped samples Li0.97Na0.03Fe(1-x)VxPO4/C (x=0, 0.01, 0.03, 0.05) cathode materials are synthesized by solid state method. Results show that the Li0.97Na0.03Fe0.97V0.03PO4/C exhibited the best electrochemical performances.

scholarly journals Improved electrochemical performance of LiFe0.4Mn0.6PO4/C with Cr3+ doping

RSC Advances ◽  
2017 ◽  
Vol 7 (50) ◽  
pp. 31558-31566 ◽  
Author(s):  
Peng Xiao ◽  
Yuanyuan Cai ◽  
Xueping Chen ◽  
Zhaomin Sheng ◽  
Chengkang Chang
Keyword(s):  
Solid State ◽  
Electrochemical Performance ◽  
Cathode Materials ◽  
Solid State Method ◽  
State Method ◽  
Cr Doping

LiFe0.4Mn0.6−xCrxPO4/C (x ≤ 0.01) cathode materials with different Cr-doping were synthesized by a nano-milling assisted solid-state method.

High performance 5 V LiNi0.5Mn1.5O4 spinel cathode materials synthesized by an improved solid-state method

2016 ◽  
Vol 654 ◽  
pp. 257-263 ◽  
Author(s):  
Zhi-Gang Gao ◽  
Kai Sun ◽  
Li-Na Cong ◽  
Yu-Hang Zhang ◽  
Qin zhao ◽  
...  
Keyword(s):  
Solid State ◽  
Cathode Materials ◽  
High Performance ◽  
Solid State Method ◽  
State Method ◽  
Spinel Cathode
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