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首页> 外文期刊>Journal of power sources >Stepwise co-precipitation to synthesize LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2 one-dimensional hierarchical structure for lithium ion batteries
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Stepwise co-precipitation to synthesize LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2 one-dimensional hierarchical structure for lithium ion batteries

机译：逐步共沉淀合成锂离子电池LiNi_（1/3）Co_（1/3）Mn_（1/3）O_2一维分层结构

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摘要

LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2 one-dimensional (1D) hierarchical microrods assembled with nanoparticles have been successfully prepared through post-heat treatment of MC_2O_4·xH_2O (M = Ni, Co, Mn) microrod precursor which was obtained via stepwise co-precipitation. The CoC_2O_4·2H_2O microrod crystallites formed in the first step can effectively template the subsequent formation of manganese, cobalt and nickel oxalates on the initial CoC_2O_4·2H_2O microrods during the second step co-precipitation, without assistance of any surfactants. The LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2 1D hierarchical microrods with pores and voids as cathode material for lithium ion batteries exhibit superior initial coulombic efficiency, reversible capacity, rate capability and cycling stability to the LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2 microsized particles. They deliver high specific discharge capacities of 163.3 and 104.9 mAh g~(-1) at rates of 0.1 and 20 C, respectively. At 0.5 C, they achieve a discharge capacity of 152.2 mAh g~(-1) with a capacity retention of 89.5% after 160 cycles. The excellent electrochemical performance can be attributed to the novel hierarchical microrod structure with much porous and void space, which shortens the diffusion path of electron and lithium ion, and benefits for their transfer. In addition, this unique structure provides not only appropriate contact area between electrode and electrolyte, but also good accommodation for the strain relaxation during charge and discharge.
机译：通过对MC_2O_4·xH_2O（M = Ni，Co，通过逐步共沉淀获得的Mn）微棒前体。第一步中形成的CoC_2O_4·2H_2O微棒微晶可在第二步共沉淀过程中有效模板化随后在初始CoC_2O_4·2H_2O微棒上形成锰，钴和草酸镍，而无需使用任何表面活性剂。具有孔隙和空隙的LiNi_（1/3）Co_（1/3）Mn_（1/3）O_2一维分层微棒作为锂离子电池的正极材料，与锂离子电池相比，具有优异的初始库仑效率，可逆容量，倍率能力和循环稳定性。 LiNi_（1/3）Co_（1/3）Mn_（1/3）O_2微尺寸颗粒。它们以0.1和20 C的速率分别提供163.3和104.9 mAh g〜（-1）的高比放电容量。在0.5 C下，经过160个循环后，它们的放电容量为152.2 mAh g〜（-1），容量保持率为89.5％。优异的电化学性能可归因于新颖的分层微棒结构，该结构具有大量的孔隙和空隙空间，缩短了电子和锂离子的扩散路径，并有利于其转移。另外，这种独特的结构不仅在电极和电解质之间提供了适当的接触面积，而且还为充电和放电过程中的应变松弛提供了良好的适应性。

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  • 来源
    《Journal of power sources》 |2014年第25期|144-151|共8页
  • 作者

    Zeheng Yang; Jianbo Lu; Doucheng Bian; Weixin Zhang; Xiaoning Yang; Jianfeng Xia; Gongde Chen; Heyun Gu; Guo Ma;

  • 作者单位

    School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, Anhui 230009, PR China, Anhui Key Laboratory of Controllable Chemical Reaction & Material Chemical Engineering, Hefei, Anhui 230009, PR China;

    School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, Anhui 230009, PR China, Anhui Key Laboratory of Controllable Chemical Reaction & Material Chemical Engineering, Hefei, Anhui 230009, PR China;

    School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, Anhui 230009, PR China, Anhui Key Laboratory of Controllable Chemical Reaction & Material Chemical Engineering, Hefei, Anhui 230009, PR China;

    School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, Anhui 230009, PR China, Anhui Key Laboratory of Controllable Chemical Reaction & Material Chemical Engineering, Hefei, Anhui 230009, PR China;

    School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, Anhui 230009, PR China, Anhui Key Laboratory of Controllable Chemical Reaction & Material Chemical Engineering, Hefei, Anhui 230009, PR China;

    School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, Anhui 230009, PR China, Anhui Key Laboratory of Controllable Chemical Reaction & Material Chemical Engineering, Hefei, Anhui 230009, PR China;

    School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, Anhui 230009, PR China, Anhui Key Laboratory of Controllable Chemical Reaction & Material Chemical Engineering, Hefei, Anhui 230009, PR China;

    School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, Anhui 230009, PR China, Anhui Key Laboratory of Controllable Chemical Reaction & Material Chemical Engineering, Hefei, Anhui 230009, PR China;

    School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, Anhui 230009, PR China, Anhui Key Laboratory of Controllable Chemical Reaction & Material Chemical Engineering, Hefei, Anhui 230009, PR China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Layered cathode material; Stepwise co-precipitation; One-dimensional hierarchical structure; Lithium ion battery;

    机译：层状阴极材料;逐步共沉淀;一维层次结构;锂离子电池;

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