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Preparation method of nickel cobalt lithium manganate as high voltage lithium battery anode material

A technology of nickel-cobalt lithium manganese oxide and positive electrode materials, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of insufficient capacity and cycle performance of 523-type ternary positive electrode materials, and achieve enhanced surface coating effects and improved Capacity performance and cycle performance, and the effect of increasing the charge and discharge voltage

Inactive Publication Date: 2014-04-09
JIANGSU KING LITHIUM CELL
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AI Technical Summary

Problems solved by technology

The capacity performance and cycle performance of the existing 523-type ternary cathode materials are still insufficient

Method used

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Embodiment Construction

[0014] Embodiments of the inventive method comprise the following steps:

[0015] 1. Add nickel nitrate, cobalt nitrate and manganese nitrate solution into the reaction kettle according to the molar ratio of Ni:Co:Mn=5:2:3, so that the total metal ion concentration of the mixed solution is 2 mol / liter, and adjust with deionized water The volume of the solution is 4 liters;

[0016] 2. While constantly stirring the mixed solution in the reactor, slowly add a mixed solution of sodium hydroxide and ammonia water with a mixed concentration of 3 mol / liter, and gradually generate nickel-cobalt-manganese hydroxide precipitation in the reaction solution, and control the reaction temperature at 45 °C until the pH of the reaction solution reaches 10.8;

[0017] 3. The precipitated nickel-cobalt-manganese hydroxide produced by the reaction is washed with deionized water and press-filtered until the pH of the washing water is less than 8.5, and the washed product is dried at 120°C for 4 ...

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Abstract

The invention relates to a preparation method of nickel cobalt lithium manganate as a high voltage lithium battery anode material. The preparation method comprises the following steps of adding a nickel salt, a cobalt salt and a manganate salt into a reaction kettle, adding a mixed solution of sodium hydroxide or potassium hydroxide and ammonium hydroxide, and reacting to generate nickel cobalt lithium manganate hydroxide precipitate; washing, filter-pressing and drying the precipitate to obtain nickel cobalt manganate hydroxide; carrying out ball milling on the nickel cobalt manganate hydroxide and a lithium salt, and uniformly mixing; sintering a mixed product so as to obtain the nickel cobalt lithium manganate; adding magnesium acetate and zirconium acetate in the deionized water, and preparing a mixed solution; and adding the mixed solution to a water phase system of the nickel cobalt lithium manganate, and drying; and carrying out high-temperature processing on the dried product to obtain a final product. The preparation method provided by the invention has the advantage that the capacity property and the cycling property of the lithium battery anode material can be effectively improved.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a lithium electrode, in particular to a preparation method of nickel-cobalt lithium manganese oxide, a positive electrode material of a high-voltage lithium battery. Background technique [0002] At present, the nickel-cobalt lithium manganese oxide (type 523) products on the market have a compacted density of 3.4-3.6g / cm3, a capacity of 155-160mAh / g at 4.2V, and 0.5C. Improving the energy density of lithium nickel cobalt manganese oxide is mainly considered from two aspects: improving compaction and increasing charge and discharge voltage. The capacity performance and cycle performance of the existing 523-type ternary cathode materials are still insufficient. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a preparation method of nickel-cobalt lithium manganese oxide, a high-voltage lithium battery anode mat...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122H01M4/505H01M4/525H01M4/62Y02E60/10
Inventor 叶城
Owner JIANGSU KING LITHIUM CELL
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