| Related citation: | Ao Xia,Jue Yi,Wanru Yu,Xin Yang,Chenpeng Zhao.Delamination of Birnessite MnO2 into Nanosheets as Anode Materials for Lithium Ion Batteries[J].Journal of Harbin Institute Of Technology(New Series),2021,28(4):77-83.DOI:10.11916/j.issn.1005-9113.19102. |
|
| Author Name | Affiliation | | Ao Xia | School of Materials Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science & Technology, Xi’an 710021, China | | Jue Yi | School of Materials Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science & Technology, Xi’an 710021, China | | Wanru Yu | School of Materials Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science & Technology, Xi’an 710021, China | | Xin Yang | Shaanxi Rainbow New Material Co., Ltd., Xianyang 712000, Shaanxi, China | | Chenpeng Zhao | School of Materials Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science & Technology, Xi’an 710021, China |
|
| Abstract: |
| The delamination of birnessite MnO2 into nanosheets by freezing and thawing method was reported here. The proton-type birnessite manganese oxide (H-birnessite) was added to tetramethylammonium hydroxide (TMAOH) solution in a polypropylene tube which was then sealed. Fifty cycles consisting of fast freezing (in liquid nitrogen for 30 s) and thawing ( in 70 ℃ water for 30 min) were operated. The as-prepared slurry was characterized by X-ray diffraction (XRD) and transmission electron microscope (TEM). The XRD result showed the layered structural H-birnessite was delaminated. The TEM result revealed the product had a nanosheet-like morphology. Employed as an anode material for lithium-ion batteries, MnO2 nanosheets as-prepared delivered a specific charging capacity of 1040.6 mAh/g after 100 cycles at 100 mA/g. |
| Key words: birnessite MnO2 nanosheets lithium-ion batteries specific capacity liquid nitrogen |
| DOI：10.11916/j.issn.1005-9113.19102 |
| Clc Number:TQ152 |
| Fund: |
|
| Descriptions in Chinese: |
| 水钠锰矿二氧化锰的剥离及所得纳米片的电化学性能 夏傲1，宜珏1，于婉茹1，杨欣2，赵晨鹏1 （1. 陕西科技大学材料科学与工程学院 陕西省无机材料绿色制备与功能化实验室，西安 710021；2. 陕西彩虹新材料有限公司，陕西 咸阳 712000） 摘要：本研究采用循环冷冻-溶融法成功剥离了水钠锰矿型二氧化锰从而获得MnO 2纳米片。将氢型MnO 2加入含有四甲基氢氧化铵水溶液的聚丙烯管中，待聚丙烯管密封后立即移入液氮中冷冻30 s，管中液体冻结后随即将该管移至70 ºC的恒温水浴中，30 min解冻后将聚丙烯管再次移入液氮中进行冷冻，如此反复循环70次。通过X射线衍射(XRD)和透射电子显微镜(TEM)对产物的物相和微观形貌进行了表征。XRD结果表明，氢型MnO 2的层状结构已剥离，TEM结果表明产物形貌呈纳米片状。所制备的MnO 2纳米片在电流密度1000 mA/g 下循环100次后比容量仍高达1040.6 mAh/g。 关键词：水钠锰矿型二氧化锰；纳米片；锂离子电池；比容量；液氮 |
