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Method for improving performance of electrode material LNMO

An electrode material, high-temperature sintering technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of high current performance and unsatisfactory cycle performance of LNMO materials, and achieve high current performance, electrical conductivity, and cycle performance. Effect

Active Publication Date: 2014-08-20
山东鲁顺宏泰新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Liu et al [J.Power Sources,2012,217,400–406.] and Liu et al [J.Electrochem.Soc.,2010,157,A1269–A1273.] to a certain extent by doping chromium ions in the LNMO lattice The high-current performance and cycle performance have been improved, but overall, the high-current performance and cycle performance of LNMO materials are still not ideal

Method used

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  • Method for improving performance of electrode material LNMO
  • Method for improving performance of electrode material LNMO
  • Method for improving performance of electrode material LNMO

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] This example describes a LiNi 0.45 Cr 0.1 mn 1.45 o 4 As the base electrode material, with LiBO 2 ,H 3 BO 3 and NH 4 h 2 PO 4 The reaction yielded LBPO-coated Cr-LNMO. Specific steps are as follows:

[0018] will LiBO 2 ,H 3 BO 3 and NH 4 h 2 PO 4 Mix according to the molar ratio of Li:B:P=0.1:0.967:1 to obtain the mixture, according to the above mixture and LiNi 0.45 Cr 0.1 mn 1.45 o 4 The mass ratio of the two is 1%, and the two are further mixed evenly, and then sintered in the air at 350 ° C for 7 hours to obtain LBPO-coated Cr-LNMO. It looks like figure 1 shown.

[0019] The XRD contrast of this product with pure LNMO electrode material and Cr-LNMO base electrode material (base electrode material of this embodiment) is as attached figure 2 shown. It can be seen from the figure that the Cr-LNMO material coated with LBPO and the Cr-LNMO material not coated with LBPO have the same XRD, which is different from the XRD of pure LNMO, indicating th...

Embodiment 2

[0025] This example describes a LiNi 0.5 mn 1.5 o 4 As a matrix, react with lithium carbonate, lithium hydroxide, lithium borate, and ammonium dihydrogen phosphate to obtain LBPO-coated LNMO. Specific steps are as follows:

[0026] Lithium carbonate and lithium hydroxide are mixed evenly according to the mass ratio of 1:1, and then mixed evenly with lithium borate and ammonium dihydrogen phosphate according to the molar ratio of Li:B:P=0.1:0.967:1, according to the mass ratio of 0.5%. with LiNi 0.5 mn 1.5 o 4 Further mix evenly, and sinter in air at 800°C for 8 hours to obtain LBPO-coated LNMO.

[0027]The LBPO-coated LNMO obtained above was mixed uniformly with acetylene black and PVDF at a mass ratio of 8:1:1, and coated on an aluminum foil as a positive electrode, and a metal lithium sheet was used as a negative electrode, and a 1M lithium hexafluorophosphate solution (solvent: : Ethylene carbonate, dimethyl carbonate, and ethyl methyl carbonate are mixed according t...

Embodiment 3

[0029] This example describes a Cr-LiNi 0.45 Cr 0.1 mn 1.45 o 4 As a substrate, react with lithium oxide, metaboric acid, and phosphoric acid to obtain LBPO-coated Cr-LNMO. Specific steps are as follows:

[0030] Mix lithium oxide, metaboric acid, and phosphoric acid according to the molar ratio of Li:B:P=0.1:0.967:1 and stir evenly. After the reaction is completed, add sucrose and continue to stir and heat to 150°C. Finally, a brown-black powder is formed. Combined with Cr-LiNi 0.45 Cr 0.1 mn 1.45 o 4 According to 2% mass ratio and further mixed evenly, sintered in the air at 800°C for 8 hours to obtain LBPO-coated Cr-LNMO.

[0031] The LBPO-coated Cr-LNMO obtained above was uniformly mixed with acetylene black and PVDF in a mass ratio of 8:1:1, and coated on an aluminum foil as a positive electrode, with a lithium metal sheet as a negative electrode, and with 1M lithium hexafluorophosphate solution (solvent It is: ethylene carbonate, dimethyl carbonate, and ethyl met...

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Abstract

The invention belongs to the field of an electrode material for a chemical power supply, and particularly relates to a method for improving the performance of a high-voltage electrode material LiNi0.5Mn1.5O4. The method comprises the steps: uniformly mixing a lithium compound, a boron compound and a phosphorus compound to obtain a mixture, uniformly mixing the mixture with LiNi0.5Mn1.5O4 electrode material or chromium-doped LiNi0.5Mn1.5O4 electrode material, sintering the mixture at a high temperature to obtain a LiNi0.5Mn1.5O4 electrode material with surface being coated with Li0.1B0.967PO4. The surface of LNMO is coated with a layer of LBPO, so that not only can the large-current performance be improved, but also the cycling performance can be improved.

Description

technical field [0001] The invention belongs to the field of electrode materials used in chemical power sources, and in particular relates to a high-voltage electrode material LiNi 0.5 mn 1.5 o 4 performance method. Background technique [0002] LiNi 0.5 mn 1.5 o 4 (LNMO) is an electrode material with high potential, and its working voltage is as high as 4.7V (vs. Li). Therefore, using this material as an electrode can output a higher voltage, which means it has a higher energy density. For a long time, this material has poor high-current charge-discharge performance and cycle performance, which limits its application in small electronic products, energy storage, transportation and other fields. One reason for the poor performance of this material is that its operating potential is so high that it is easily attacked by electrolyte molecules, causing the electrolyte to decompose and dissolve itself. For this reason, Liu et al. [Chem.Mater.,2009,21,1695–1707.] and Myung...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122H01M4/364H01M4/505H01M4/525H01M4/5825H01M10/0525Y02E60/10
Inventor 张汉平杨涛吴欣周贻森杨超
Owner 山东鲁顺宏泰新能源科技有限公司
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