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Preparing method for precursor of lithium ionic cell positive material

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as uneven distribution of elements, poor electrochemical performance of positive electrode materials, and poor cycle performance of positive electrode materials

Inactive Publication Date: 2008-10-15
JINCHUAN GROUP LIMITED
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Problems solved by technology

The precursor synthesized by carbonate precipitation has poor electrochemical activity, and the electrochemical performance of the positive electrode material prepared by this precursor is poor; the precursor synthesized by sodium hydroxide precipitation under air atmosphere has α-Ni(OH) 2 and β-Ni(OH) 2 Two crystal structures, which lead to uneven distribution of elements, and the positive electrode materials prepared with this precursor have poor cycle performance

Method used

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preparation example Construction

[0020] A method for preparing a precursor of a positive electrode material for a lithium ion battery, suitable for preparing the following composite hydroxide of a positive electrode material precursor for a lithium ion battery: a single, binary or multi-element compound Ni x co y mn z m 1-x-y-z o 2 (OH) 2 (wherein 0≤x, y<1, 0<z≤1 and 0<x+y+z≤1, M is one of Ca, Mg, Ti, Cr, Fe, Cu, Zn, Al), the The method comprises the following steps;

[0021] (1) The soluble metal salt is made into a solution according to the stoichiometric ratio, and the total concentration of metal ions in the salt solution is 0.1 to 3 mol / L, and then a predetermined amount of sodium hydroxide is made into a solution with a concentration of 0.1 to 5 mol / L; A predetermined amount of deionized water is added into the reaction kettle, and then a metal salt solution and a sodium hydroxide solution are added into the reaction kettle, and an inert gas is introduced at the same time.

[0022] (2) Control the...

Embodiment 1

[0025] According to the stoichiometric ratio of nickel, cobalt and manganese in the ratio of 8:1:1, the metal salt is made into a solution with a total metal ion concentration of 1mol / L, and sodium hydroxide is made into a solution with a concentration of 3mol / L. 4L of deionized water. Add 2L of metal salt solution and sodium hydroxide solution into the 30L reaction kettle at the same time, while passing argon, keep the temperature at 55±1°C, control the pH value at 10.8±0.05, and stay for 24h to synthesize the required lithium-ion battery positive electrode Material precursor composite hydroxide Ni 0.8 co 0.1 mn 0.1 (OH) 2 .

[0026] Figure 1 is the synthesized Ni 0.8 co 0.1 mn 0.1 (OH) 2 The X-ray Diffraction Spectrum. Figure 2 is the precursor Ni 0.8 co 0.1 mn 0.1 (OH) 2 Photo of the scanning environment.

[0027] It can be seen from the X-ray diffraction pattern that the precursor Ni 0.8 co 0.1 mn 0.1 (OH) 2 The crystal form is complete, with β-Ni(OH) 2 ty...

Embodiment 2

[0029] According to the stoichiometric ratio of nickel, cobalt and manganese in the ratio of 1:1:1, the metal salt is made into a solution with a total metal ion concentration of 2mol / L, and sodium hydroxide is made into a solution with a concentration of 2mol / L. 5L of deionized water. Add 2L of metal salt solution and sodium hydroxide solution into a 30L reaction kettle at the same time, and at the same time pass argon, keep the temperature at 65±1°C, and control the pH value at 10.4±0.05, and stay for 40h to synthesize the required lithium-ion battery positive electrode Material precursor composite hydroxide Ni 1 / 3 co 1 / 3 mn 1 / 3 (OH) 2 .

[0030] Figure 3 is the synthesized Ni 1 / 3 co 1 / 3 mn 1 / 3 (OH) 2 The X-ray Diffraction Spectrum. Figure 4 is the precursor Ni 1 / 3 co 1 / 3 mn 1 / 3 (OH) 2 Photo of the scanning environment.

[0031] It can be seen from the X-ray diffraction pattern that the precursor Ni 1 / 3 co 1 / 3 mn 1 / 3 (OH) 2 The crystal form is complete, wit...

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Abstract

A method for preparing the precursor of the anode material for a lithium battery is characterized in that the preparation process comprises the steps of preparing a metal salt solution with the total metal ion concentration of 0.1 to 3mol / L according to the stoichiometric proportion of corresponding metal salts and the prepared precursor composite hydroxid; adding a sodium hydroxide solution with the concentration of 0.1 to 5mol / L to the metal salt solution; and reacting under the condition of inert gases to obtain the precursor composite hydroxid. The protection by the inert gases effectively prevents the oxidation of Mn and the generation of Alpha type hydrous hydroxide, so as to prepare the pure phase composite hydroxid precursor with the Beta-Ni(OH)2 type structure. The precursor has evenly distributed elements, good electrochemical activity and is favorable for preparing high-performance anode materials.

Description

technical field [0001] A preparation method of a lithium-ion battery cathode material precursor, relating to a lithium-ion battery cathode material LiNi x co y mn z m 1-x-y-z o 2 method of preparation. Background technique [0002] Since the 1980s, energy and the environment have become two bottlenecks in the development of human society. The rapid growth of my country's economy and the sustainable development of society also urgently require the development of new energy and energy materials. Lithium-ion batteries have the advantages of large specific energy, high single operating voltage, wide operating temperature range, long cycle life, small self-discharge, and low environmental pollution. They are widely used in portable appliances, electric vehicles, hybrid electric vehicles, uninterruptible power supplies, large Communication power and other aspects have broad application prospects. [0003] Commercial lithium-ion battery cathode materials are mainly layered L...

Claims

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Application Information

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IPC IPC(8): C01G53/04C01G51/04C01G45/02H01M4/48H01M4/505
CPCY02E60/10
Inventor 李永军武浚刘会基江名喜彭小琦朱用袁超群王凤贺建军侯世霞
Owner JINCHUAN GROUP LIMITED
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