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Method for preparing proportion-adjustable nickel-rich positive electrode material of lithium ion battery

A technology for lithium ion batteries and cathode materials, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of incomplete co-precipitation, poor electrolyte matching and compatibility, and high surface pH, and achieves simple process, electric The effect of excellent chemical properties and high tap density

Inactive Publication Date: 2018-06-22
HARBIN INST OF TECH AT WEIHAI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main method of existing doping technology to synthesize ternary materials is the co-precipitation method. The traditional co-precipitation precursor preparation method is to react the three metal ions of nickel, cobalt and manganese in the same reactor at the same time to directly form the ternary precursor co-precipitation Granular (Ni,Co,Mn)(OH) 2 or (Ni,Co,Mn)CO 3 , this method has problems such as low crystallinity and incomplete co-precipitation
In particular, the synthetic nickel-rich material is easy to absorb water, has a high surface pH, and has poor compatibility and compatibility with the electrolyte.

Method used

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  • Method for preparing proportion-adjustable nickel-rich positive electrode material of lithium ion battery
  • Method for preparing proportion-adjustable nickel-rich positive electrode material of lithium ion battery
  • Method for preparing proportion-adjustable nickel-rich positive electrode material of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] What this example prepares is nickel-rich cathode material 0.3LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 0.7 LiNiO 2 0.025Al 2 o 3 .

[0026] In this example x=0.3, y=0.7, z=0.025, x:y=3:7.

[0027] Prepare 2mol / L NiSO according to stoichiometric ratio 1:1:1 4 ·6H 2 O. CoSO 4 ·7H 2 O and MnSO 4 ·H 2 O metal salt solution A600mL, prepare 2mol / L NiSO 4 ·6H 2O solution B1400mL, prepare 4mol / L NaOH and 1.6mol / L ammonia water mixed solution C2200mL; put 200mL deionized water in the reaction kettle, heat the water bath to the water temperature of 55°C, keep stirring, the stirring speed is 800rpm, and nitrogen gas For protection, first add the above-mentioned C solution to the kettle dropwise to pH=11.60, then drop the above-mentioned two solutions of A and C into the reaction kettle at the same time, the feed rate of the A solution is 0.9mL / min, adjust the feed rate of the C solution so that The pH in the kettle was maintained at 11.60±0.02 (monitored with a pH meter); after 1...

Embodiment 2

[0031] What this example prepares is nickel-rich cathode material 0.4LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 0.6LiNiO 2 0.03Al 2 o 3 .

[0032] In this example x=0.4, y=0.6, z=0.03, x:y=2:3.

[0033] Prepare 2mol / L NiSO according to stoichiometric ratio 1:1:1 4 ·6H 2 O. CoSO 4 ·7H 2 O and MnSO 4 ·H 2 O metal salt solution A800mL, prepare 2mol / L NiSO 4 ·6H 2 O solution B1200mL, prepare 4mol / L NaOH and 0.6mol / L ammonia water mixed solution C2200mL; put 300mL deionized water in the reaction kettle, heat the water bath to the water temperature of 50°C, keep stirring, the stirring speed is 700rpm, and nitrogen gas For protection, first add the above-mentioned C solution to the kettle dropwise to pH=11.40, then drop the above-mentioned two solutions of A and C into the reaction kettle at the same time, the feed rate of the A solution is 1.2mL / min, adjust the feed rate of the C solution so that The pH in the kettle was kept at 11.40±0.05 (monitored with a pH meter); after 0.5h, sol...

Embodiment 3

[0035] What this example prepares is nickel-rich cathode material 0.25LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 0.75LiNiO 2 .

[0036] In this example x=0.25, y=0.75, z=0, x:y=1:3.

[0037] Prepare 2mol / L NiSO according to stoichiometric ratio 1:1:1 4 ·6H 2 O. CoSO 4 ·7H 2 O and MnSO 4 ·H 2 O metal salt solution A800mL, prepare 2mol / L NiSO 4 ·6H 2 O solution B2400mL, prepare 4mol / L NaOH and 0.6mol / L ammonia water mixed solution C3500mL; put 250mL deionized water in the reaction kettle, heat the water bath to the water temperature of 55 ° C, keep stirring, stirring speed 500rpm, nitrogen gas For protection, first add the above-mentioned C solution to the kettle dropwise to pH=11.80, then drop the above-mentioned two solutions of A and C into the reaction kettle at the same time, the feed rate of the A solution is 1.0mL / min, adjust the feed rate of the C solution so that The pH in the kettle was kept at 11.80±0.03 (monitored with a pH meter); after 2 hours, the A solution was stop...

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Abstract

The invention belongs to the technical field of lithium ion battery material preparation, and particularly relates to a method for preparing a proportion-adjustable nickel-rich positive electrode material of a lithium ion battery. According to the scheme of the invention, a chemical formula of the positive electrode material is xLiNi1 / 3Co1 / 3Mn1 / 3O2.yLiNiO2.zAl2O3, wherein x is greater than or equal to 0.2 and less than or equal to 0.5, y is greater than or equal to 0.5 and less than or equal to 0.8, z is greater than or equal to 0 and less than or equal to 0.1, and the sum of x and y is equalto 1. The preparation steps are as follows: controlling the feed speed ratio according to the value of x:y, implementing multi-layered stacking on LiNi1 / 3Co1 / 3Mn1 / 3O2 and LiNiO2 by alternate precipitation, synthesizing a nickel-rich positive electrode material precursor with multiple composite structures, and then performing mixed calcination with an aluminum salt gel to achieve that the outer layer is coated with Al2O3, and finally adopting an ozone-oxygen mixed atmosphere calcination mode to further shorten the calcination time of the material and improve the calcination efficiency. The nickel-rich positive electrode material prepared by the method has high tap density and excellent electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of preparation of lithium-ion battery materials, and in particular relates to a preparation method of a nickel-rich cathode material for a lithium-ion battery with an adjustable ratio. Background technique [0002] With the improvement of social modernization, the number of cars in the world is increasing, burning a large amount of fossil raw materials such as petroleum, resulting in serious environmental pollution problems, and the development of electric vehicles has become a common goal of the world. Lithium-ion batteries have broad application prospects in the field of electric vehicles due to their high voltage, high specific capacity, high specific energy, no pollution, long cycle life, small self-discharge and good safety performance. [0003] The performance of lithium-ion batteries is closely related to the performance of positive and negative electrode materials. At present, negative electrode mate...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/505H01M4/525H01M4/62H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 朱永明高鹏王桢黄德勇
Owner HARBIN INST OF TECH AT WEIHAI
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