Pre-heat treatment of carbonate precursor firstly in nitrogen and then oxygen atmospheres: A new procedure to improve tap density of high-performance cathode material Li1.167(Ni0.139Co0.139Mn0.556)O2 for lithium ion batteries
Pre-heat treatment of carbonate precursor firstly in nitrogen and then oxygen atmospheres: A new procedure to improve tap density of high-performance cathode material Li1.167(Ni0.139Co0.139Mn0.556)O2 for lithium ion batteries
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先氮气后氧气气氛预热碳酸盐前驱体：提高锂离子电池高性能正极材料Li1.167(Ni0.139Co0.139Mn0.556)O2振实密度的新工艺
DOI：
10.1016/j.jpowsour.2015.05.036
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发表时间：
2015-10
影响因子：
9.2
通讯作者：
Lianqi Zhang
中科院分区：
文献类型：
--
作者：
Xiaoqing Wang;Dawei Song;Jian Guo;Lianqi Zhang
为了提高富锂层状材料的振实密度，采用先N2后O2的（Ni 1/6Co 1/6 Mn 4/6）CO 3前驱体预热处理工艺，将CO2的释放和O2的吸收过程分开，从而降低材料的孔隙率，提高材料的振实密度。与仅在O2中进行一步预热处理相比，两步预热处理导致所得金属氧化物的形态、振实密度、颗粒分布以及结构存在差异。采用两步法制备的致密金属氧化物的振实密度得到了显著提高。因此，与一步法（LM-O）相比，两步法（LM-N）制备的Li1.167（Ni0.139Co0.139Mn0.556）O2具有致密的颗粒、更高的振实密度、更小的BET比表面积和更多的Ni 3+存在，但两种方法制备的样品具有相似的层状结构。然而，循环伏安和充放电测试的结果表明LM-N的电化学性能较差，LM-N的放电容量为76.7 mAh g− 1，与LM-O的267.9 mAh g − 1形成鲜明对比。这可能与LM-N的致密形貌、晶格缺陷以及较大的Rct有关。
In order to increase the tap density of Li-rich layered materials, a new pre-heat treatment procedure of (Ni1/6Co1/6Mn4/6)CO3precursors firstly using N2and then O2is adopted to separate processes of CO2emission and O2absorption, which presumably can reduce porosity of materials and then result in an improved tap density. In contrast to one-step pre-heat treatment procedure only in O2, two-steps procedure causes differences in morphology, tap density, particle distribution as well as structure for resultant metal oxides. A remarkably improved tap density of metal oxide with dense particles is observed with two-steps procedure. Consequently, Li1.167(Ni0.139Co0.139Mn0.556)O2obtained through two-steps procedure (LM-N) presents dense particle, much improved tap density, small BET specific surface area and additional existence of Ni3+in comparison with that obtained through one-step procedure (LM-O), although both samples exhibit similar well-defined layered structure. However, the results of cyclic voltammograms and charge–discharge test demonstrate the inferior electrochemical performances of LM-N with a discharge capacity of 76.7 mAh g−1for LM-N, which is in stark contrast with 267.9 mAh g−1of LM-O. This is possibly associated with the dense morphology, lattice defect as well as large Rctfor LM-N.
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影响因子：
6.6
作者：
Y. Chen;Guofeng Xu;Jianling Li;Yakun Zhang;Zhong-Cai Chen;F. Kang
通讯作者：
Y. Chen;Guofeng Xu;Jianling Li;Yakun Zhang;Zhong-Cai Chen;F. Kang
影响因子：
9.2
作者：
S. Shi;J. Tu;Yu Tang;Yi Zhang;X. Wang;C. Gu
通讯作者：
S. Shi;J. Tu;Yu Tang;Yi Zhang;X. Wang;C. Gu
影响因子：
5.4
作者：
G. Kim;Seung-Beob Yi;Y. Park;Ho Gi Kim
通讯作者：
G. Kim;Seung-Beob Yi;Y. Park;Ho Gi Kim
影响因子：
6.6
作者：
Xixi Shi;Chiwei Wang;Yantao Zhang;Qian Liu;Hong Li;Dawei Song;Lianqi Zhang
通讯作者：
Xixi Shi;Chiwei Wang;Yantao Zhang;Qian Liu;Hong Li;Dawei Song;Lianqi Zhang
影响因子：
5.4
作者：
Johnson, CS;Kim, JS;Thackeray, MM
通讯作者：
Thackeray, MM