Defect-induced plating of lithium metal within porous graphene networks

被引：412

作者：

Mukherjee, Rahul ^{[1
]}

Thomas, Abhay V. ^{[1
]}

Datta, Dibakar ^{[2
]}

Singh, Eklavya ^{[1
]}

Li, Junwen ^{[3
]}

Eksik, Osman ^{[1
]}

Shenoy, Vivek B. ^{[3
]}

Koratkar, Nikhil ^{[1
]}

机构：

[1] Rensselaer Polytech Inst, Troy, NY 12180 USA

[2] Brown Univ, Providence, RI 02912 USA

[3] Univ Penn, Philadelphia, PA 19104 USA

来源：

NATURE COMMUNICATIONS | 2014年 / 5卷

基金：

美国国家科学基金会;

关键词：

CATHODE MATERIALS; LIFEPO4/C COMPOSITE; CAPACITY RETENTION; ION; CARBON; MECHANISMS; ENERGY; LI; ELECTRODES; ADSORPTION;

D O I：

10.1038/ncomms4710

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Lithium metal is known to possess a very high theoretical capacity of 3,842mAhg(-1) in lithium batteries. However, the use of metallic lithium leads to extensive dendritic growth that poses serious safety hazards. Hence, lithium metal has long been replaced by layered lithium metal oxide and phospho-olivine cathodes that offer safer performance over extended cycling, although significantly compromising on the achievable capacities. Here we report the defect-induced plating of metallic lithium within the interior of a porous graphene network. The network acts as a caged entrapment for lithium metal that prevents dendritic growth, facilitating extended cycling of the electrode. The plating of lithium metal within the interior of the porous graphene structure results in very high specific capacities in excess of 850mAhg(-1). Extended testing for over 1,000 charge/discharge cycles indicates excellent reversibility and coulombic efficiencies above 99%.

引用

页数：10

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