NCM ternary cathode material with recombinant La2nNi0.5Li0.5O4 and doped La<3+> on surface layer

A cathode material and surface layer technology, which is applied in the field of NCM ternary cathode materials, can solve the problems affecting the electrochemical cycle stability and safety performance of NCM ternary cathode materials, and the deterioration of electrode structure, so as to promote interlayer transport and inhibit increase. Effect

Active Publication Date: 2019-05-10
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Li + / Ni 2+ The phase change problem caused by mixing generally starts on the surface of NCM ternary cathode material particles, and then gradually diffuses to the interior of the particles (Seung-Taek Myung, Filippo Maglia, Kang-Joon Park, Chong Seung Yoon, Peter Lamp, Sung-Jin Kim, and Yang-KookSun, ACS Energy Lett.2017, 2, 196-223), causing the electrode structure to decay, affecting the electrochemical cycle stability and safety performance of NCM ternary cathode materials (Arumugam Manthiram, James C.Knight, Seung-Taek Myung, Seung-Min Oh, and Yang-Kook Su, Adv. Energy Mater. 2016, 6, 1501010)

Method used

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  • NCM ternary cathode material with recombinant La2nNi0.5Li0.5O4 and doped La&lt;3+&gt; on surface layer
  • NCM ternary cathode material with recombinant La2nNi0.5Li0.5O4 and doped La&lt;3+&gt; on surface layer
  • NCM ternary cathode material with recombinant La2nNi0.5Li0.5O4 and doped La&lt;3+&gt; on surface layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] The LiNi synthesized in Comparative Example 1 0.869 co 0.921 mn 0.389 o 2 and La(NO 3 ) 3 ·6H 2 O crystal by LiNi 0.869 co 0.921 mn 0.389 o 2 : Mix La with a mass ratio of 0.99:0.01, sonicate in absolute ethanol for 1 h, then grind evenly in a mortar with absolute ethanol as a solvent, and finally calcinate at a high temperature of 500 ° C for 5 h to obtain a surface-recombined La 2 Ni 0.5 Li 0.5 o 4 and surface doped La 3+ The NCM ternary cathode material is denoted as La-500-10.

[0061] The XRD result of described material is as figure 2 As shown, it can be seen that the main peak of La-500-10 is also consistent with the position of the LiNiO2 peak, but there are several miscellaneous peaks between 20°-35°, and the miscellaneous peaks are consistent with PDF#53-1671, corresponding to La 4 NiLiO 8 , and the corresponding space group is I4 / mmm. Through XRD analysis, it is proved that there is a self-assembled cladding layer La on the surface layer. 2...

Embodiment 2

[0074] The LiNi synthesized in Comparative Example 1 0.869 co 0.921 mn 0.389 o 2 and La(NO 3 ) 3 ·6H 2 O crystal by LiNi 0.869 co 0.921 mn 0.389 o 2 : Mix La with a mass ratio of 0.99:0.01, sonicate in absolute ethanol for 1 h, then grind evenly in a mortar with absolute ethanol as a solvent, and then calcinate at a high temperature of 600 ° C for 5 h, a surface recombined La 2 Ni 0.5 Li 0.5 o 4 and surface doped La 3+ NCM ternary cathode material, denoted as La-600-10.

[0075] The 0.2C charge and discharge test results of the materials described in Comparative Example 1 and this example in the voltage range of 2.75 to 4.3V are as follows: Figure 6 As shown, it can be seen from the figure that the La-600-10 described in this example has a discharge capacity of 210.9mAh / g in the first week, a coulombic efficiency of 85.8% in the first week, and a discharge specific capacity of 200.7mAh / g after 50 cycles. 50 th The capacity retention rate was 95.2%. While the ...

Embodiment 3

[0077] The LiNi synthesized in Comparative Example 1 0.869 co 0.921 mn 0.389 o 2 and La(NO 3 ) 3 ·6H 2 O crystal by LiNi 0.869 co 0.921 mn 0.389 o 2 : Mix La with a mass ratio of 0.99:0.01, sonicate in absolute ethanol for 1 h, then grind evenly in a mortar with absolute ethanol as a solvent, and then calcinate at a high temperature of 750 ° C for 5 h to obtain a surface-recombined La 2 Ni 0.5 Li 0.5 o 4 and surface doped La 3+ NCM ternary cathode material, denoted as La-750-10.

[0078] The 0.2C charge and discharge test results of the materials described in Comparative Example 1 and this example in the voltage range of 2.75 to 4.3V are as follows: Figure 7 As shown, it can be seen from the figure that the La-750-10 described in this example has a discharge capacity of 205.8mAh / g in the first week, a coulombic efficiency of 86.2% in the first week, and a discharge specific capacity of 199.2mAh / g after 50 cycles. 50 th The capacity retention rate was 96.8%. W...

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Abstract

The invention relates to an NCM ternary cathode material with recombinant La2nNi0.5Li0.5O4 and doped La<3+> on a surface layer, and belongs to the field of chemical energy storage batteries. The material is prepared by the steps of mixing an NCM ternary cathode material with La(NO3)3.6H2O to obtain a mixture, wherein the mixture is subjected to ultrasonic treatment in absolute ethanol for 1-2 hours, then uniformly grinding by using the absolute ethanol as a solvent, and calcining obtained powder to obtain the material, wherein the mass fraction of an element La in the mixture is 1-2.5%, the calcining temperature is 500-750 DEG C, and the calcining time is 4-6 hours. According to the material, the cycling performance and the rate performance of the NCM ternary cathode material are enhanced,the heat stability and the capacity retention rate of the NCM ternary cathode material are improved, and the structural stability of the NCM ternary cathode material in electrochemical cycling is remarkably improved.

Description

technical field [0001] The invention relates to a surface recombined La 2 Ni 0.5 Li 0.5 o 4 and surface doped La 3+ The NCM ternary cathode material belongs to the field of chemical energy storage batteries. Background technique [0002] At present, fossil energy sources such as coal, oil and natural gas are increasingly depleted. In addition, the problem of environmental pollution has gradually become the focus of attention of all countries. The development of pure electric vehicles and gasoline-gas hybrid vehicles has attracted more and more attention. This requires the rapid development of lithium secondary batteries to meet people's urgent needs for practical applications of new energy batteries. In the family of lithium secondary batteries, lithium cobalt oxide, lithium iron phosphate and ternary materials play an important role in the market in turn. Lithium cobalt oxide is mostly used in small portable electronic devices, while lithium iron phosphate is gradual...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCY02E60/10
Inventor 苏岳锋李晴陈来卢赟包丽颖吴锋
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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