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Nickel-cobalt-manganese precursor, preparation method of nickel-cobalt-manganese ternary material and lithium ion battery

A ternary material, nickel-cobalt-manganese technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of difficult to achieve industrialized production, high cost, complicated processes, etc., and achieve easy large-scale industrialization, cycle stability and Improved structural stability and simple and feasible solutions

Active Publication Date: 2019-04-12
SUNWODA ELECTRONICS
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  • Application Information

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Problems solved by technology

However, the existing preparation methods of transition metal ion gradient type high-nickel ternary cathode materials containing internal voids are too complicated and costly, making it difficult to realize industrial production

Method used

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  • Nickel-cobalt-manganese precursor, preparation method of nickel-cobalt-manganese ternary material and lithium ion battery
  • Nickel-cobalt-manganese precursor, preparation method of nickel-cobalt-manganese ternary material and lithium ion battery
  • Nickel-cobalt-manganese precursor, preparation method of nickel-cobalt-manganese ternary material and lithium ion battery

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preparation example Construction

[0028] refer to figure 1 , an embodiment of the present invention proposes a method for preparing a nickel-cobalt-manganese precursor, including:

[0029] S1: Under an inert gas atmosphere, make solution A of nickel salt, cobalt salt, manganese salt and deionized water, and control the total molar concentration of nickel, cobalt and manganese in solution A to the first specified concentration;

[0030] In this embodiment, the reaction was performed under an inert gas range to exclude oxygen in the reaction system and prevent transition metal ions from being oxidized. The first specified concentration includes: the total molar concentration of the three elements of nickel, cobalt and manganese in solution A includes 0.5-5 mol / L. Wherein the nickel salt is one of nickel sulfate, nickel nitrate, nickel chloride or nickel acetate, the cobalt salt is one of cobalt sulfate, cobalt nitrate, cobalt chloride or cobalt acetate, and the manganese salt is manganese sulfate, manganese nit...

Embodiment 1

[0046] 1. Preparation of nickel-cobalt-manganese precursor (NCM811 hydroxide precursor) material containing polystyrene particles (PSB): under nitrogen protection, nickel sulfate, cobalt sulfate, and manganese sulfate were mixed in a molar ratio of 8:1:1 Be made into the mixed solution of 2.5molL-1, then add the polystyrene particle (PSB) that the diameter of 1% is about 400nm in mass ratio, then add the hexadecyltrimethylammonium bromide that accounts for total mass fraction 1% as Dispersant, fully stirred and mixed evenly to obtain solution A; sodium hydroxide was formulated into 4molL-1 alkali solution as a precipitant, and 1mol / L ammonia water was used as a complexing agent, and these three solutions were added dropwise to In a continuously stirred reactor, the pH value of the reaction (pH=9.5) and the temperature of the reaction (40°C) are strictly controlled. The reaction time is 8 hours, and the aging time after the reaction is 12 hours. Washing and drying at a constant...

Embodiment 2

[0049] 1. Preparation of PSB-containing nickel-cobalt-manganese precursor (NCM622 hydroxide precursor) material: under the protection of nitrogen, nickel nitrate, cobalt nitrate, and manganese nitrate were prepared in a molar ratio of 6:2:2 to 0.5molL-1 Mix the solution, then add polystyrene particles (PSB) with a diameter of about 50nm with a mass ratio of 0.1%, and then add 0.01% of the total mass fraction of hexadecyltrimethylammonium bromide as a dispersant, fully stir and mix evenly , to obtain solution A; the 0.5molL-1 alkali solution prepared by sodium hydroxide is used as a precipitating agent, and 0.1mol / L ammonia water is used as a complexing agent, and these three solutions are added dropwise to the continuous stirring reaction in parallel. In the kettle, and strictly control the pH value of the reaction (pH=8) and the temperature of the reaction (60°C), the reaction time is 6h, and the aging time after the reaction is 10h, the coprecipitation solution is suction fil...

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Abstract

The invention provides a nickel-cobalt-manganese precursor, a preparation method of a nickel-cobalt-manganese ternary material and a lithium ion battery. Starting from the preparation of the precursorof the high nickel ternary material, the high nickel ternary positive electrode material with internal voids in the secondary particles and gradient layers of transition metal ions in the primary particles is prepared by using organic polymer particles as a pore-forming agent and its carbonized substance in lithium sintering as a reducing agent. A new method is developed to fabricate a porous high nickel ternary positive electrode material with the gradient layers of transition metal ions. The method is simple and feasible and easy to industrialize on a large scale. The gram capacity, cyclicstability and structural stability of the lithium ion battery using the porous high nickel ternary material containing transition metal ion gradient layers as the positive electrode material have beenimproved significantly.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a nickel-cobalt-manganese precursor, a preparation method of a nickel-cobalt-manganese ternary material, and a lithium-ion battery. Background technique [0002] In recent years, with the strong support of national policies, new energy vehicles have developed rapidly, and high-capacity power lithium-ion batteries have gradually become a research hotspot. The high-nickel ternary cathode material has become one of the ideal cathode materials with a discharge specific capacity as high as 200mAh / g. However, due to the high nickel content, the thermal stability, cycle stability and storage performance are poor, which greatly limits its application in power lithium-ion batteries. Commonly used solutions such as bulk doping and surface coating have limited effects on improving the electrochemical performance of high-nickel ternary cathode materials. At the same time, during the ch...

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 张旭辉张耀李鲲
Owner SUNWODA ELECTRONICS
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