Synthesis of MnO anchored on carbon sheet networks using NaCl as template and its improved lithium-storage properties
- PDF / 2,611,445 Bytes
- 9 Pages / 595.276 x 790.866 pts Page_size
- 64 Downloads / 170 Views
ORIGINAL PAPER
Synthesis of MnO anchored on carbon sheet networks using NaCl as template and its improved lithium-storage properties Tao Bai 1 & Xueyu Dai 1 & Yan Pan 1 & Hui Guo 1 & Zhaohui Tang 1 & Xiangyang Zhou 2 Received: 28 May 2020 / Revised: 26 October 2020 / Accepted: 9 November 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract MnO is considered as an attractive anode material for lithium ion batteries. However, the drastic volume changes during lithiation, and the low intrinsic conductivity will restrict the application of MnO anode. In this work, the MnO@carbon network hybrid is fabricated through template-based synthesis combing with vacuum freeze-drying, followed by a thermal reduction process. The resulting composite (MnO@carbon networks hybrid) is made up of thin carbon sheet networks and MnO particles anchored on carbon networks. The thin carbon sheet networks with high electrical conductivity can efficiently improve the conductivity of the hybrid, shorten the transport path of Li+, and buffer the drastic volume changes of nanosized MnO particles. As a consequence, the MnO@carbon network hybrid shows improved lithium-storages properties, which exhibits a highly reversible capacity of 1027 mA h g-1 at 0.2 A g-1 after 100 cycles and outstanding rate capacity of 321 mA h g-1 at 5 A g-1. Keywords MnO nanoparticles . Carbon sheet networks . Template-based synthesis . Anode . Lithium-ion batteries
Introduction With the development of renewable energy sources and hybrid electric vehicles, lithium-ion batteries (LIBs) are considered as attractive energy storage devices due to high power density, non-memory effect, and long cycle life [1–8]. Up to now, the anode material in commercial LIBs typically is graphite, which cannot satisfy the increasing demands of the electronic equipment because of its low theoretical capacity (372 mA h g-1) [9–11]. It is important to explore anode materials with large capacity, such as transition metal oxide-based, tin-based materials, and silicon-based materials [12–16]. MnO, as a transition metal oxide, is regarded as a promising anode material due to its high theoretical capacity (756 mA h g-1), low cost, and abundant source [17]. However, the drastic volume changes of MnO during charge/discharge process will result in pulverization of MnO particles and subsequent electrical disconnection between active materials and current * Tao Bai [email protected] 1
Changsha Nonferrous Metallurgy Design and Research Institute Company Limited, Changsha 410019, China
2
School of Metallurgy and Environment, Central South University, Changsha 410083, China
collector, which leads to capacity loss. In addition, the low intrinsic conductivity of MnO will lead to inferior rate performance [18, 19]. As a consequence, the application of MnO anode is still restricted by these drawbacks. Recently, there are many works focused on combining nano-sized MnO with carbon to solve these issues. For example, Wang et al. synthesized nano-sized MnO embedded in a porous matrix a
Data Loading...
