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Preparation method of concentration gradient distributed lithium, nickel, cobalt, manganese and oxygen ternary lithium battery cathode material

A lithium-nickel-cobalt-manganese-oxygen ternary lithium, concentration gradient technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems affecting the improvement of material cyclability, poor surface lattice stability of materials, and difficulty in battery capacity and cyclability. Taking into account and other issues, to achieve the effect of improving cycle performance and increasing battery capacity

Inactive Publication Date: 2014-04-02
宁夏科捷锂电池股份有限公司
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Problems solved by technology

[0002] Ternary materials have been widely used as positive electrode materials for lithium batteries, but the existing ternary positive electrode materials have the defect that it is difficult to balance battery capacity and cycleability. The grid stability is poor, which affects the improvement of material cycle performance under high voltage

Method used

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Embodiment Construction

[0015] The method of the embodiment of the present invention comprises the following steps:

[0016] 1) Prepare nickel sulfate, cobalt sulfate, and manganese sulfate in molar ratios of 5:2:3, 8:1:1, and 2:2:6 respectively in 2.1mol / L solutions, numbered 1, 2, and 3, and use Ammonia water complexed to pH 6.6, 6.8, 7.0;

[0017] 2) Configure 1.8mol / L NaOH+0.4mol / L NH respectively 3 ·H 2 O, 1.8mol / L NaOH+1.8mol / L NH 3 ·H 2 O, 1.8mol / L NaOH+2.2mol / L NH 3 ·H 2 O three solutions, respectively numbered I, II, III;

[0018] 3) Take m liters of No. 1 solution, slowly add No. 1 solution dropwise until the pH is 11 and continue to stir mechanically. The reaction time is 4 hours. The reaction is carried out in a constant temperature water bath at 50°C, and N is introduced during the process. 2 Protect;

[0019] 4) Add 3mL of No. 2 solution to the solution after the reaction in the previous step, and slowly add No. 2 Uninterrupted protection and mechanical stirring;

[0020] 5) A...

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Abstract

The invention relates to a preparation method of a concentration gradient distributed lithium, nickel, cobalt, manganese and oxygen ternary lithium battery cathode material. The method comprises the following steps: 1) preparing a solution from nickel sulfate, cobaltous sulfate and manganese sulfate according to different mole ratios, and numbering as 1, 2 and 3; 2) preparing three NaOH+NH3.H2O solutions with different ratios respectively, and numbering as I, II, and III respectively; 3) adding the No. I solution dropwise into the No.1 solution to react; 4) adding a No.2 solution, and adding the No.II solution dropwise to react; 5) adding the No.3 solution, and adding the No.III solution dropwise to react; 6) filtering, washing and drying after reacting and aging completely, thereby obtaining a ternary precursor; 7) mixing lithium carbonate and the ternary precursor, adding aluminum oxide powder, and carrying out ball milling; 8) sintering; and 9) crushing, thereby obtaining the concentration gradient distributed lithium, nickel, cobalt, manganese and oxygen ternary lithium battery cathode material. According to the preparation method disclosed by the invention, the material cyclicity can be improved, and meanwhile the battery capacity of the material can be increased.

Description

technical field [0001] The invention relates to the manufacture of positive electrode materials for lithium batteries, in particular to a method for preparing positive electrode materials for lithium-nickel-cobalt-manganese-oxygen ternary lithium batteries with concentration gradient distribution. Background technique [0002] Ternary materials have been widely used as positive electrode materials for lithium batteries, but the existing ternary positive electrode materials have the defect that it is difficult to balance battery capacity and cycleability. The grid stability is poor, which affects the improvement of material cycle performance under high voltage. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method for preparing a positive electrode material of a lithium-nickel-cobalt-manganese-oxygen ternary lithium battery with high battery capacity and good cycle performance. [0004] The preparation method ...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M4/505
CPCY02E60/122H01M4/505H01M4/525Y02E60/10
Inventor 胡永正
Owner 宁夏科捷锂电池股份有限公司
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