Sandwich-like Mn3O4/carbon nanofragment composites with a higher capacity than commercial graphite and hierarchical voltage plateaus for lithium ion batteries. (10th August 2017)

• Record Type: Journal Article
• Authors: Zhuang, Yuchan; Ma, Zhen; Deng, Yaoming; Song, Xiaona; Zuo, Xiaoxi; Xiao, Xin; Nan, Junmin
• Is Part Of: Electrochimica acta. Volume 245(2017)
• Page Start: 448
• Page End: 455
• Publication Date: 2017-08-10
• Subjects: lithium-ion batteries -- transition metal oxide -- higher capacity -- Mn3O4; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2017.05.171
• Languages: English
• ISSNs: 0013-4686

Abstract

Graphical abstract: Abstract: As lithium-ion batteries (LIBs) find application in new fields, the specific capacity of single LIBs must be enhanced, and the backward-cell problem in battery modules must be solved. Here, Mn3 O4 and carbon nanofragment (Mn3 O4 /CNF) composites are synthesized and shown to have higher capacities than commercial graphite (theoretical capacity of approximately 372 mAh·g −1 ) and hierarchical voltage plateaus. Nanosized Mn3 O4 particles are introduced into the CNFs to simultaneously increase the specific capacity and prevent the corresponding LIB modules from over-discharging. The Mn 2+ -modified CNFs are spray-dried and calcined to form Mn3 O4 /CNF composites with 1.62%, 3.21%, and 6.74% Mn, which exhibit enhanced reversible specific capacities of 486.1, 609.3, and 539.0 mAh·g −1, respectively, at 0.1C after 100 cycles. Furthermore, the additional voltage plateau at 1.2 V due to Mn3 O4 can help prevent the corresponding LIB modules from over-discharging and metallic lithium deposition on the anode.