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Improvement of electrochemical performance of the Li 9 V 3 (P 2 O 7 ) 3 (PO 4 ) 2 cathode material by aliovalent Mo 4+ doping
Journal of Solid State Electrochemistry ( IF 2.6 ) Pub Date : 2020-11-20 , DOI: 10.1007/s10008-020-04873-y
He Duan , Zhen Wang , Bin He , Jun Zhang , Heng Yao , Yanming Zhao , Qinghua Fan , Quan Kuang , Youzhong Dong

Attributed to the realization of the multielectron transfers, with a stable 3D framework, Li9V3 (P2O7)3(PO4)2 is considered an excellent cathode material, which can reversibly extract/insert nearly 5 mol Li. However, the poor intrinsic electronic conductivity and the low lithium diffusion coefficient limited its practical electrochemical ability. Considering the poor intrinsic electronic conductivity of the pristine Li9V3(P2O7)3(PO4)2 compound, the introduction of one extra electron by replacing V3+ with aliovalent Mo4+ ions increases the concentration of the electronic charge carriers from Li9V3(P2O7)3(PO4)2 and thus improves the electronic conductivity. At the same time, the larger ionic radius of Mo4+ leads to the increasement of the cell volume of the Li9V3(P2O7)3(PO4)2 sample and thus facilitates Li+ transport into the structure. As a result, the electrochemical performances of the Li9V3(P2O7)3(PO4)2 were improved obviously by a small amount of Mo. Especially for the Li9V3-xMox(P2O7)3(PO4)2 (x = 0.02) sample, the electrode present the highest specific capacity herein and an excellent rate performance which is a promising cathode for lithium ion battery application.



中文翻译:

铝价Mo 4+掺杂改善Li 9 V 3(P 2 O 7)3(PO 4)2正极材料的电化学性能

Li 9 V 3(P 2 O 73(PO 42具有稳定的3D框架,归因于多电子转移的实现,被认为是一种极好的阴极材料,可以可逆地提取/插入近5 mol Li。然而,不良的固有电子电导率和低的锂扩散系数限制了其实际的电化学能力。考虑到原始的Li 9 V 3(P 2 O 73(PO 42的固有电子导电性差化合物中,通过用铝价Mo 4+离子取代V 3+引入一个额外的电子,增加了Li 9 V 3(P 2 O 73(PO 42中电子载流子的浓度,从而提高了电导率。同时,较大的Mo 4+离子半径导致Li 9 V 3(P 2 O 73(PO 42样品的电池体积增加,从而有利于Li +运输到结构中。结果,少量的Mo明显改善了Li 9 V 3(P 2 O 73(PO 42的电化学性能。特别是对于Li 9 V 3-x Mo x(P 2 O 73(PO 42(x = 0.02)样品,该电极在此处具有最高的比容量和出色的倍率性能,是锂离子电池应用中有希望的阴极。

更新日期:2020-11-21
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