High-nickel lithium ion positive electrode material and preparation method thereof

A cathode material, high nickel lithium technology, applied in the direction of positive electrode, battery electrode, active material electrode, etc., can solve the problems of deterioration of discharge specific capacity, low first charge and discharge efficiency, and reduction of battery specific capacity.

Inactive Publication Date: 2019-07-19
SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

LiNixCO1-XO2 cathode material has the advantages of lithium cobaltate and lithium nickelate, high discharge specific capacity, good cycle performance, low cost and less environmental pollution, but due to the high nickel material is prone to cation mixing phenomenon, thus There will be defects such as poor thermal stability and low initial charge and discharge efficiency. At present, in order to solve this problem, it is often modified by doping and coating. Although the mixing phenomenon is improved to a certain extent and the stability of the structure is improved, but Since the doping or coating is an inactive substance, the specific capacity of the battery is reduced to a certain extent. In order to solve this problem, PCT pate

Method used

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  • High-nickel lithium ion positive electrode material and preparation method thereof
  • High-nickel lithium ion positive electrode material and preparation method thereof
  • High-nickel lithium ion positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The first step is the preparation of high-nickel cathode material precursor:

[0035] a. Solution preparation: select nickel sulfate, cobalt sulfate, manganese sulfate, and magnesium nitrate, and prepare a 0.5mol / L metal salt solution according to the metal ion ratio of Ni:Co:Mn:Al:Mg=0.6:0.2:0.12:0.04 A1, including core material salt solution (Ni:Co=0.8:0.2) and shell material solution (Ni:Co:Al:Mg=0.4:0.2:0.24:0.08:0.08), and the volume ratio of core material to shell material is 5 : 5; The NaOH solution of 4mol / L is uniformly mixed with the ammoniacal liquor of 25% concentration by volume ratio 9:1, is mixed with mixed alkali solution B;

[0036] b. The preparation of the reaction kettle bottom liquid and the control of the reaction kettle conditions: inject deionized water into the reaction kettle, and adjust the pH value of the bottom liquid to 8 with ammonia water, control the temperature in the reaction kettle to 40°C, and the speed to 300rpm. Nitrogen, and thro...

example 2

[0053] The first step is the preparation of high-nickel cathode material precursor:

[0054] a, solution preparation: select nickel sulfate, cobalt sulfate, manganese sulfate, magnesium oxalate, be Ni:Co:Mn:Mg=0.9:0.05:0.03:0.02 according to metal ion ratio and be prepared into the metal salt solution A1 of 3mol / L, wherein , Prepare 3mol / L high nickel metal core material salt solution Ni:Co=0.95:0.05, 3mol / L first shell material Ni:Co:Mn:Mg=0.8:0.1:0.06:0.04, and second shell material Ni:Co:Mn:Mg=1 / 3: 1 / 3: 1 / 5:2 / 15. Wherein, the solution volume ratio of the core material and the two shell materials is 4 / 5:2 / 15:1 / 15, and the NaOH solution of 8mol / L and the disodium edetate solution of 15% concentration are mixed according to the volume ratio Mix 9:1 evenly to prepare mixed alkali solution B;

[0055] b. Preparation of reaction kettle bottom liquid and control of reaction kettle conditions: Inject deionized water into the reaction kettle, and adjust the pH value of the bottom ...

example 3

[0062] The first step is the preparation of high-nickel cathode material precursor:

[0063] a. Solution preparation: select nickel sulfate, cobalt sulfate, manganese sulfate, and sodium metaaluminate, and prepare 4mol / L metal salt solution A1 according to the metal ion ratio of Ni:Co:Mn:Al=0.855:0.1:0.03:0.02 , wherein the preparation of 4mol / L high nickel metal salt solution (Ni:Co=0.9:0.1) and 4mol / L high manganese metal salt solution (Ni:Co:Mn:Al=1 / 3:1 / 9:1 / 3:2 / 9), in which the volume ratio of high nickel solution and high manganese solution is 9:1, 10mol / L NaOH solution and 10% ammonia solution are uniformly mixed at a volume ratio of 6:4 to prepare a mixed alkali Solution B;

[0064] b. Preparation of reaction kettle bottom liquid and control of reaction kettle conditions: Inject deionized water into the reaction kettle, and adjust the pH value of the bottom liquid to 11 with ammonia water, control the temperature in the reaction kettle to 40°C, and the speed to 800rpm,...

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PUM

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Abstract

The invention discloses a high-nickel lithium ion positive electrode material. The molecular formula is LiNi<x>Co<y>Mn<1-x-y-z>M<z>O2, wherein M is a doping element, the lithium ion positive electrodematerial is spherical secondary particle formed by gathering primary particle, and the structure of the lithium ion positive electrode material is a homogeneous-phase structure, a core-shell structure and a concentration gradient structure. The preparation method of the lithium ion positive electrode material comprises the steps of preparing a high-nickel positive electrode material precursor andpreparing the lithium ion secondary battery positive electrode. The precursor of the high-nickel positive electrode material is synthesized by a co-precipitation method, uniform mixing of elements can be facilitated, reaction can be more sufficient by adding the aging process, and morphology control is facilitated; and with the adoption of multi-element co-doping, the stability of a material crystal structure can be improved, the content of a Mn element is reduced, other doping elements are introduced, the lithium and nickel mixed arrangement degree of the high-nickel positive electrode material can be reduced, the orderliness of a layered material is ensured, the structure of the material is stabilized, the discharging specific capacity is improved, so that the energy density of the battery is improved.

Description

technical field [0001] The invention relates to a lithium-ion battery cathode material, in particular to a high-nickel lithium-ion battery cathode material and a preparation method thereof. Background technique [0002] At present, the power battery is still mainly lithium iron phosphate battery, but its specific energy is limited, and it will be difficult to meet the needs of passenger vehicles in terms of cruising range in the future. Therefore, the pursuit of high specific energy is an important research and development direction of lithium-ion power batteries. Due to the difference in the capacity of the positive and negative electrodes, the positive electrode material is often the bottleneck that affects the energy density of the battery. LiNixCO1-XO2 cathode material has the advantages of lithium cobaltate and lithium nickelate, high discharge specific capacity, good cycle performance, low cost and less environmental pollution, but due to the high nickel material is pr...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 金柳兵安黎张友为孙佩佩孟凡星王烽霖张耀
Owner SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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