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Metal gradient doped lithium battery positive electrode material

A cathode material, gradient doping technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of loss of high energy density, material capacitance decline, reduced industrial availability, etc., to achieve good electrochemical characteristics and thermal stability. The effect of improving the overall operation efficiency and improving the industrial utilization

Inactive Publication Date: 2016-08-17
JEN CATHOLIC UNIV
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Problems solved by technology

However, it is technically difficult and difficult to control to coat the entire material with a nano-scale protective layer uniformly, thus greatly reducing industrial applicability
[0009] The metal doping method is to uniformly dope non-electrochemically active metals in the positive electrode material structure to improve the stability of the material structure itself, but if it is desired to significantly inhibit the reaction between the material surface and the electrolyte, a high dose of doping is required. modified substances, which will cause a substantial decline in the capacitance of the material, but instead lose the characteristics of the high energy density of the material itself.

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  • Metal gradient doped lithium battery positive electrode material
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  • Metal gradient doped lithium battery positive electrode material

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Embodiment 1

[0042] The test result of embodiment 1 and comparative example 1 is described as follows, test result is as follows Figure 2 to Figure 6 shown.

[0043] Regarding the analysis of physical characteristics, the positive electrode material of the embodiment Al(GD)-LNCO was quantitatively analyzed for the whole, surface and section by using inductively coupled plasma atomic emission spectrometry (ICP / OES) and energy dispersive spectrometer (EDS). The molar ratio of the aluminum element doped into the lithium nickel cobalt oxide as a whole was determined by ICP / OES to be 2.55%. figure 2 (a) is the surface morphology of Al(GD)-LNCO cathode material, and figure 2 (b) is the aluminum element distribution map on the surface of the Al(GD)-LNCO cathode material, showing that there is indeed a high dose of aluminum element on the surface of the Al(GD)-LNCO cathode material. also, figure 2 (c) is the cross-sectional shape of the Al(GD)-LNCO cathode material, which can show that ther...

Embodiment 2

[0055] The test result of embodiment 2 and comparative example 2 is described as follows, test result is as follows Figure 7 to Figure 11 shown.

[0056] Regarding the analysis of physical characteristics, the positive electrode material of the embodiment Mg(GD)-LNCMO was quantitatively analyzed on the whole, surface and section by using inductively coupled plasma atomic emission spectrometry (ICP / OES) and energy dispersive spectrometer (EDS). The molar ratio of magnesium doped into the lithium nickel cobalt manganese oxide as a whole was determined by ICP / OES to be 1.7%. Figure 7 (a) is the surface morphology of Mg(GD)-LNCMO cathode material, while Figure 7 (b) is the magnesium element distribution map on the surface of the Mg(GD)-LNCMO cathode material, showing that there is indeed a high dose of magnesium on the surface of the Mg(GD)-LNCMO cathode material. also, Figure 7 (c) is the cross-sectional shape of the Mg(GD)-LNCMO cathode material, which shows that there is...

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Abstract

A metal gradient doped lithium battery positive electrode material containing a hexagonal crystal positive electrode material body and modified metal. An active unit of the positive electrode material powder body is composed of oxides of single metal of nickel and cobalt, or two metals of nickel and cobalt, nickel and manganese, and cobalt and manganese, or three metals of nickel, cobalt and manganese; and the modified metal is an active metal element different from nickel, cobalt or manganese, in particular, the modified metal is concentrated on the surface of the positive electrode material powder and shows continuous decline towards the core, thereby forming a continuous concentration gradient doping distribution; and the powder material has no interface or stratification. Since the modified metal has higher concentration on the surface of the positive electrode material powder, the reactivity of surface of positive electrode material to the electrolyte can be reduced, thereby enhancing stability and security of the lithium battery, lowing the dose, and increasing energy density and service life.

Description

technical field [0001] The invention relates to a metal gradient doped lithium battery positive electrode material, especially magnesium (Mg), calcium (Ca), strontium (Sr), boron (B), aluminum (Al), gallium (Ga), indium One of (In), titanium (Ti), silicon (Si) and tin (Sn) is doped in the hexagonal cathode material structure in a continuous concentration gradient distribution to improve the material capacity, service life and safety. , thereby improving the high energy of the positive electrode material. Background technique [0002] In recent years, with the increasingly severe global warming phenomenon and the energy crisis caused by the gradual reduction of oil, human beings urgently need to develop electric vehicles that are more energy-saving, carbon-reducing, and environmentally friendly. The research and development of lithium batteries with high safety and high energy density for use in electric vehicles has become the most important link in the field of environment...

Claims

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Application Information

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IPC IPC(8): H01M4/131
CPCY02E60/10
Inventor 刘茂煌任健汶黄信达林琮闵
Owner JEN CATHOLIC UNIV
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