已入深夜,您辛苦了!由于当前在线用户较少,发布求助请尽量完整的填写文献信息,科研通机器人24小时在线,伴您度过漫漫科研夜!祝你早点完成任务,早点休息,好梦!

Influence of Synthesis, Dopants and Cycling Conditions on the Cycling Stability of Lithium Nickel Manganese Oxyfluoride Spinels

阳极 材料科学 电解质 锂(药物) 阴极 电压 容量损失 比能量 掺杂剂 过渡金属 离子 自行车 电池(电) 化学工程 电极 电气工程 光电子学 冶金 兴奋剂 化学 功率(物理) 热力学 工程类 物理 历史 医学 有机化学 生物化学 考古 催化作用 物理化学 内分泌学
作者
Andres Höweling,Holger Geßwein,Joachim R. Binder
出处
期刊:Meeting abstracts 卷期号:MA2016-03 (2): 494-494
标识
DOI:10.1149/ma2016-03/2/494
摘要

Higher capacities and energies are needed in order to achieve widespread acceptance of Li-ion batteries as power sources in electric vehicles. In principle, Li-ion batteries offer two possibilities to achieve higher specific energies. Since the batteries’ energy is determined by the operational voltage and the active materials capacity, one could improve either the capacity of the active materials or the operating voltage of the cell. Both approaches are pursued by many research groups. Higher capacities can for example be achieved with Li-rich layered oxides, where the use of more than 1 Li in the active material can considerably improve the capacity. The operational voltage is mainly determined by the potential of the cathode material vs. Li-metal. Therefore high voltage cathode materials (e.g. LiM x Mn 2-x O 4 , with M = e.g. Ni, Co) are used. However both approaches suffer from different limitations and problems. The need for balancing and the commonly relatively low mean voltages of ca. 3.5 V vs. Li + /Li 0 reduce the gain in specific energy for materials with high capacities. On the other hand, the use of high voltage materials leads to unwanted site reactions and severe capacity fade when applied with a graphitic Anode. This is because the cells are operated above the stability window (ca. 1.0 – 4.3 V vs. Li + /Li 0 in the presence of transition metal ions like Ni 4+ and Mn 4+ ) of current organic electrolytes. Furthermore the theoretical capacity of 147 mAh g -1 for the LiNi 0.5 Mn 1.5 O 4 high voltage spinel is relatively low. The shortcomings of the high voltage spinel can be overcome, when metallic lithium is used as the anode material. Not only the cycling stability is significantly improved but also the use of metallic lithium leads to the ability of cycling of 2 Li eq. per cycle, since the spinel lattice is able to host 2 Li eq. This is leading to a theoretical capacity of 294 mAh g -1 and therefore a theoretical specific energy of ~1030 Wh kg -1 can be reached when the cell is cycled between 2.0 and 5.0 V vs. Li + /Li 0 . Unfortunately, the cycling of 2 Li eq. is leading to a severe capacity fade due to a phase transition from cubic to tetragonal in the low voltage region associated with material degradation. In this work doping with transition metal ions is used to improve capacity retention when cycling between 2.0 and 5.0 V vs Li + /Li 0 . Initial capacities and stabilities are directly dependent on synthesis conditions and doping elements. The goal is to achieve a high stability of the material at a low tradeoff of capacity. Therefore different combinations of doping elements are used and tested at different cycling conditions. In addition to the transition metal ions, fluorine doping is also used to increase cycling stability. The influence of different synthesis, doping and cycling conditions on cycling stability and capacity retention are discussed.

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
大幅提高文件上传限制,最高150M (2024-4-1)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
Singularity应助LuoYR@SZU采纳,获得10
刚刚
畅快访蕊发布了新的文献求助10
刚刚
努力学习的阿文完成签到,获得积分10
2秒前
ku完成签到,获得积分10
3秒前
wjq2430发布了新的文献求助10
4秒前
4秒前
llnysl完成签到 ,获得积分10
4秒前
科目三应助wangyue采纳,获得10
8秒前
11秒前
11秒前
13秒前
14秒前
15秒前
16秒前
善良起眸完成签到 ,获得积分10
18秒前
烟雨江南完成签到,获得积分10
18秒前
李小伟发布了新的文献求助10
18秒前
小丸子完成签到,获得积分10
19秒前
子车芷烟完成签到,获得积分10
20秒前
23秒前
23秒前
大个应助迅速的访天采纳,获得30
24秒前
芝士蛋糕完成签到 ,获得积分10
25秒前
和谐板栗发布了新的文献求助30
26秒前
figshare完成签到,获得积分10
26秒前
Odingers发布了新的文献求助10
27秒前
30秒前
苏打水完成签到,获得积分10
32秒前
ShowMaker应助哈哈采纳,获得10
33秒前
华仔应助liweiDr采纳,获得10
36秒前
小詹完成签到,获得积分10
40秒前
零蝉完成签到 ,获得积分10
41秒前
华仔应助如意的擎宇采纳,获得10
41秒前
AixLeft完成签到,获得积分10
46秒前
科目三应助Steve采纳,获得10
48秒前
48秒前
liweiDr发布了新的文献求助10
52秒前
高贵书南完成签到,获得积分10
53秒前
53秒前
54秒前
高分求助中
Kinetics of the Esterification Between 2-[(4-hydroxybutoxy)carbonyl] Benzoic Acid with 1,4-Butanediol: Tetrabutyl Orthotitanate as Catalyst 1000
The Young builders of New china : the visit of the delegation of the WFDY to the Chinese People's Republic 1000
Rechtsphilosophie 1000
Handbook of Qualitative Cross-Cultural Research Methods 600
Chen Hansheng: China’s Last Romantic Revolutionary 500
Mantiden: Faszinierende Lauerjäger Faszinierende Lauerjäger 500
PraxisRatgeber: Mantiden: Faszinierende Lauerjäger 500
热门求助领域 (近24小时)
化学 医学 生物 材料科学 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 基因 遗传学 催化作用 物理化学 免疫学 量子力学 细胞生物学
热门帖子
关注 科研通微信公众号,转发送积分 3139305
求助须知:如何正确求助?哪些是违规求助? 2790227
关于积分的说明 7794427
捐赠科研通 2446625
什么是DOI,文献DOI怎么找? 1301309
科研通“疑难数据库(出版商)”最低求助积分说明 626124
版权声明 601109