Ternary anode material precursors, synthesis method thereof and lithium ion battery

A technology of positive electrode materials and ternary materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low power performance of ternary positive electrode materials, achieve the effects of increasing migration speed, reducing migration impedance, and reducing S content

Active Publication Date: 2017-05-31
SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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  • Abstract
  • Description
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Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the main purpose of the present invention is to provide a ternary cathode material precursor

Method used

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  • Ternary anode material precursors, synthesis method thereof and lithium ion battery
  • Ternary anode material precursors, synthesis method thereof and lithium ion battery

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preparation example Construction

[0032] refer to figure 2 , an embodiment of the present invention also provides a ternary cathode material precursor Ni x co y mn 1-x-y-z Me z (OH) 2The synthesis method, wherein, 0.33x co y mn 1-x-y-z Me z (OH) 2 The morphology of the crystal is flake-like stacked spherical particles, the precursor crystal grows into flakes along the 001 crystal plane, and the intensity ratio of X-ray diffraction peak 101 to 001 is >0.3, including:

[0033] Step S1 reaction solution preparation: add soluble manganese salt, nickel salt, cobalt salt, magnesium salt, zirconium salt or titanium salt to deionized water to prepare a mixed salt solution according to the stoichiometric ratio of the target precursor, and mark it as M1 solution after filtration; Add NaOH and deionized water to make a solution, and mark it as M2 solution after filtration; dilute ammonia water to make a solution, and mark it as M3 solution after filtration;

[0034] Step S2 Preparation of seed crystals in react...

Embodiment 1

[0053] refer to figure 1 , the ternary precursor Ni provided in this example 0.33 co 0.33 mn 0.33 Me 0.01 (OH) 2 The shape of the crystal is flake-like stacked spherical particles, the precursor crystal grows into flakes along the 001 crystal plane, and the intensity ratio of X-ray diffraction peak 101 to 001 is 0.33, where Me is Ca 2+ , Mg 2+ with Zr 4+ mixed dopant.

[0054] refer to figure 2 , the synthesis of the above-mentioned precursor is as follows:

[0055] Using battery grade manganese sulfate, nickel sulfate, cobalt sulfate, magnesium sulfate, calcium chloride, zirconium sulfate as raw materials, according to the target precursor Ni 0.33 co 0.33 mn 0.33 Me 0.01 (OH) 2 Prepare a mixed salt solution of 110g / L, and mark it as M1 solution after filtration, where Me is Ca 2+ , Mg 2+ with Zr 4+ Mixed dopant, Ca 2+ The content is 112ppm, Mg 2+ The content is 106ppm, (Ca 2+ +Mg 2+ ) and Zr 4+ The molar ratio of is 1.385. Add battery-grade flake NaOH a...

Embodiment 2

[0060] The ternary cathode material precursor Ni provided in this embodiment 0.45 co 0.22 mn 0.316 Me 0.014 (OH) 2The shape of the crystal is flake-like stacked spherical particles, the precursor crystal grows into flakes along the 001 crystal plane, and the intensity ratio of X-ray diffraction peak 101 to 001 is 0.37, where Me is Ca 2+ , Mg 2+ with Zr 4+ mixed dopant.

[0061] refer to figure 2 , the synthesis of the above-mentioned precursor is as follows:

[0062] Using battery grade manganese sulfate, nickel sulfate, cobalt sulfate, magnesium sulfate, calcium chloride, zirconium sulfate as raw materials, according to the target precursor Ni 0.45 co 0.22 mn 0.316 Me 0.014 (OH) 2 Prepare a 90g / L mixed salt solution, and mark it as M1 solution after filtration, where Me is Ca 2+ , Mg 2+ with Zr 4+ Mixed dopant, Ca 2+ The content is 208ppm, Mg 2+ The content is 212ppm, (Ca 2+ +Mg 2+ ) and Zr 4+ The molar ratio is 0.998. Add battery-grade flake NaOH and de...

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Abstract

The invention discloses a ternary anode material precursor, a synthesis method thereof and a lithium ion battery. The precursor has the formula of NixCoyMn1-x-y-zMez (OH) <2>, wherein X is greater than 0.33 and less than 0.51, Y is greater than 0.3 and less than 0.33, Z is greater than 0 and less than 0.02, and Me is a mixture of divalent metal and tetravalent metal. In the scheme, the ternary anode material has a ball-shaped morphology of flaky stacks. The crystal preferentialy grows along the 001 crystal plane, exposes the crystal surface which easily makes the lithium ion diffuse, and accelerates the rate of lithium ion detachment. The specific ball-shaped morphology of flaky stacks is capable of increasing the contact surface of the anode with the electrolyte, so that the power performance of the material is excellent. Furthermore, the specific ball-shaped morphology of flaky stacks ensures that the S-content of the ternary anode material precursor is obviously lower than that of ordinary process. The crystallinity of the material is improved and the stability of the material is further enhanced.

Description

technical field [0001] The invention relates to the field of lithium-ion battery cathode materials, in particular to a ternary cathode material precursor, a synthesis method and a lithium-ion battery. Background technique [0002] With the development of new energy technology, lithium-ion batteries have gradually penetrated into various fields of life and played an increasingly important role in daily life. The application trend of lithium-ion in the field of power vehicles is even higher. The Ministry of Science and Technology issued the "National Key R&D Program New Energy Vehicle Key Special Implementation Plan", which clearly requires that the energy density of car power batteries should reach 200Wh / kg. Nickel-cobalt-manganese ternary cathode materials have attracted special attention because of their high energy density. In order to meet the application of ternary cathode materials in electric cars, higher requirements are put forward for the power characteristics and s...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M10/0525C01G53/04
CPCC01G53/04C01P2004/03C01P2004/32H01M4/505H01M4/525H01M10/0525H01M2004/021Y02E60/10
Inventor 吴振豪张耀
Owner SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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