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High-capacity cathode material for lithium ion batteries and preparation method thereof

A technology for lithium-ion batteries and cathode materials, which is applied in battery electrodes, batteries, secondary batteries, etc., can solve problems such as poor chemical cycle performance, poor safety performance, and poor thermal stability, and improve the structure and preparation difficulties. Manufacturing Low cost and improved thermal stability

Inactive Publication Date: 2016-02-17
SICHUAN FUHUA NEW ENERGY HIGH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of high-capacity lithium-ion battery positive electrode material and preparation method thereof, aim at solving existing lithium-ion battery lithium nickelate (LiNiO 2 ) Poor electrochemical cycle performance, poor thermal stability, and poor safety performance of positive electrode materials

Method used

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  • High-capacity cathode material for lithium ion batteries and preparation method thereof
  • High-capacity cathode material for lithium ion batteries and preparation method thereof
  • High-capacity cathode material for lithium ion batteries and preparation method thereof

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preparation example Construction

[0041] Such as figure 1 As shown, the preparation method of the lithium ion battery positive electrode material of the embodiment of the present invention comprises the following steps:

[0042] S101: NiSO 4 ·6H 2 O,CoSO 4 ·7H 2 O and Al(NO 3 ) 3 9H 2 O is dissolved in an appropriate amount of deionized water to obtain a molar ratio of Ni 2+ :Co 2+ :Al 3+ =(1-x-y-m):x:y=(1-m):0:0 1.5mol / L nickel-rich solution A (0.1≤m≤0.4);

[0043] S102: NiSO 4 ·6H 2 O,CoSO 4 ·7H 2 O and Al(NO 3 ) 3 9H 2 O is Ni in molar ratio 2+ :Co 2+ :Al 3+ =m:x:y=(20m):3:1 is dissolved in an appropriate amount of deionized water to obtain an equal volume of nickel-poor solution B (0.1≤m≤0.4);

[0044] S103: Add solution A to solution B at a speed (V) of 10mL / min-10L / min, stir vigorously to make it evenly mixed;

[0045] S104: At the same time, put the mixed solution under N 2 Under protection, add it into the reaction tank (container C) at twice the speed of solution A (2V), so that ...

Embodiment 1

[0058] The technical scheme of the present invention is: lithium-ion battery cathode material LiNi 0.8 co 0.15 Al 0.05 o 2 and LiNi 0.75 co 0.2 Al 0.05 o 2 .

[0059] Lithium-ion battery cathode material LiNi 0.8 co 0.15 Al 0.05 o 2 The preparation method is characterized in that, comprises the following steps:

[0060] Step 1. NiSO 4 ·6H 2 O,CoSO 4 ·7H 2 O and Al(NO 3 ) 3 9H 2 O, Ni in molar ratio 2+ :Co 2+ :Al 3+ =(1-x-y-m):x:y=(1-m):0:0 dissolved in an appropriate amount of deionized water to obtain 1.5mol / L solution A; (0.1≤m≤0.4)

[0061] Step 2. NiSO 4 ·6H 2 O,CoSO 4 ·7H 2 O and Al(NO 3 ) 3 9H 2 O, Ni in molar ratio 2+ :Co 2+ :Al 3+ =m:x:y=(20m):3:1=2:3:1 (m=0.1) was dissolved in an appropriate amount of deionized water to prepare solution B with the same volume as solution A;

[0062] Step 3. Add solution A to solution B at a rate of 20mL / min, and stir vigorously to make it evenly mixed;

[0063] Step 4. Add the mixed solution into the r...

Embodiment 2

[0069] Dissolve 0.30 mol of nickel sulfate in 200 mL of deionized water to completely dissolve it to obtain (nickel-rich) solution A; dissolve 0.10 mol of nickel sulfate, 0.075 mol of cobalt sulfate and 0.025 mol of aluminum nitrate in 200 mL of deionized water to prepare a mixed salt ( Nickel-poor) solution B;

[0070] Add solution A to the mixed salt solution B at a speed of 10mL / min, and keep stirring, and at the same time, add the mixed solution of liquid A and liquid B to the stirring reaction tank under nitrogen protection at a speed of 20mL / min (container C ), while co-currently adding 4mol / L sodium hydroxide precipitating agent and 1mol / L ammonia complexing agent, and adjusting the pH value to 11, the reaction temperature is controlled at 50°C, and the stirring speed is 600rpm; Aged at room temperature for 12 hours, then filtered, washed with hot deionized water for several times, and finally dried in a blast drying oven at 105°C for 24 hours. Mix the dried precursor ...

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Abstract

The invention discloses a high-capacity cathode material for lithium ion batteries and a preparation method thereof. The high-capacity cathode material is LiNi1-x-yCoxAlyO2. While Nickel sulfate solution rich in nickel is added into mixed solution of nickel, cobalt and aluminum poor in nickel, the mixed solution is added to a reaction tank; sodium hydroxide and ammonia-water solution are added into the reaction tank, and a coprecipitate Ni1-x-yCoxAly(OH)2+y precursor is prepared; the precursor undergoes ageing, filtration, washing and drying and then is mixed with a lithium source, and the mixed material is formed by compression; the material formed by compression is placed in a tube furnace to be presintered and sintered in oxygen airflow or oxygen-enriched air flow, and a target product is obtained. The prepared high-capacity cathode material for the lithium ion batteries is free of impure phase and high in crystallization quality, the product particle size distribution is uniform, the high-capacity cathode material has very high discharged specific capacity and cycling stability, an operation process is simple, raw material sources are extensive, the manufacturing cost is low, and large-scale industrial production is achieved easily.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a high-capacity lithium-ion battery cathode material and a preparation method thereof. Background technique [0002] With the deteriorating global environment and the depletion of oil and other resources, the research and development of energy conservation and emission reduction and green energy is imminent. Both at home and abroad attach great importance to the development and application of new energy and renewable clean energy. Lithium-ion battery is one of the more promising new green energy sources. Due to the advantages of high energy density, fast charging, small self-discharge, long-term storage, excellent cycle performance, no memory effect, wide operating temperature, and light weight, lithium-ion batteries have been widely used in various portable electronic devices. It is also expected to be used as a power source for electric vehicles and h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/485H01M4/46H01M10/0525
CPCH01M4/463H01M4/485H01M4/525H01M10/0525H01M2220/20Y02E60/10
Inventor 刘兴泉刘一町何振华
Owner SICHUAN FUHUA NEW ENERGY HIGH TECH CO LTD
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