Understanding the critical chemistry to inhibit lithium consumption in lean lithium metal composite anodes

被引:16
作者
Kautz, David J. [1 ]
Tao, Lei [2 ]
Mu, Linqin [1 ]
Nordlund, Dennis [3 ]
Feng, Xu [1 ]
Zheng, Zhifeng [2 ,4 ]
Lin, Feng [1 ]
机构
[1] Virginia Tech, Dept Chem, Blacksburg, VA 24061 USA
[2] Southwest Forestry Univ, Coll Mat Sci & Engn, Natl Joint Engn Res Ctr Highly Efficient Utilizat, Kunming 650224, Yunnan, Peoples R China
[3] SLAC Natl Accelerator Lab, Stanford Synchrotron Radiat Lightsource, Menlo Pk, CA 94025 USA
[4] Xiamen Univ, Coll Energy, Fujian Engn & Res Ctr Clean & High Valued Technol, Xiamen 361102, Peoples R China
基金
美国国家科学基金会; 中国国家自然科学基金;
关键词
SOLID-ELECTROLYTE INTERPHASE; LI-ION BATTERIES; HIGH-ENERGY; FLUOROETHYLENE CARBONATE; RECHARGEABLE BATTERIES; VINYLENE CARBONATE; STATE BATTERIES; CAPACITY; CATHODES; GROWTH;
D O I
10.1039/c8ta01715h
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Lithium metal has been deemed by many as the Holy Grail of anode materials due to its high theoretical capacity (approximate to 3860 mA h g(-1)), redox potential of -3.040 V vs. SHE, and light weight. The goal of this work is to investigate the relationship between a lean lithium metal anode and its consumption as a function of host materials, electrochemical protocol and electrolyte composition. With the use of carbon nanofibers, lithium metal has been electrodeposited onto the host matrix and used in a battery with a LiNi0.6Mn0.2Co0.2O2 cathode. The mass-loading of lithium can be easily controlled and utilized to investigate the practicality of an anode limited battery (i.e., limited lithium with an effective thickness <15 m) in a high surface area matrix. We quantify the consumption rate of active lithium using different electrolyte additives and current rates in full cells and observe that the lithium consumption behavior in an anode-limited cell is different from that in an anode-excess cell. Our results highlight the necessity of applying truly lithium-limited cells when evaluating the electrochemical properties of lithium anodes and electrolyte additives. By extending this method to a standard graphite host, full cells can retain 75% of their initial capacities after 1000 cycles. The present study demonstrates the importance of graphitic carbon in increasing the lifespan of limited lithium (<15 m) for practical lithium metal batteries.
引用
收藏
页码:16003 / 16011
页数:9
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