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Method for preparing lithium ion battery anode material with concentration gradient

A technology for lithium ion batteries and positive electrode materials, which is applied in battery electrodes, circuits, electrical components, etc., to achieve the effects of improved stability, improved electrochemical performance, and high stability

Active Publication Date: 2014-04-30
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, there is no report about using this method to prepare lithium-ion cathode materials with this structure

Method used

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  • Method for preparing lithium ion battery anode material with concentration gradient
  • Method for preparing lithium ion battery anode material with concentration gradient
  • Method for preparing lithium ion battery anode material with concentration gradient

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] a. The precursor of the spherical high-nickel positive electrode material is dispersed into the solution system containing lithium nickel cobalt manganese: the acetate of lithium nickel manganese cobalt is used as the raw material, and the molar ratio of lithium nickel cobalt manganese element is 41.6:5:3:2 (wherein the molar ratio of the nickel element to the three elements of nickel, cobalt and manganese is 0.5), dissolved in deionized water; then the precursor Ni of the spherical high-nickel positive electrode material 0.8 co 0.1 Al 0.1 (OH) 2 (the mol ratio of the nickel-cobalt-manganese element total amount in the spherical high-nickel positive electrode material precursor and the nickel-cobalt-manganese element total amount in the solution is 3) and dispersant (dispersant is polyethylene glycol and alcohol, press positive electrode material quality 30%), and mixed uniformly in the prepared lithium-nickel-cobalt-manganese solution, stirred to form a suspension, a...

Embodiment 2

[0026] a. Disperse the precursor of the spherical high-nickel positive electrode material into a solution system containing lithium, nickel, cobalt, and manganese: the acetate of lithium, nickel, manganese, and cobalt is used as a raw material, and the molar ratio of lithium, nickel, cobalt, and manganese is 15.6:5:3:2 , dissolved in deionized water; and then weighed an appropriate amount of spherical high-nickel cathode material precursor Ni 0.8 co 0.1 mn 0.1 (OH) 2 (the mol ratio of the nickel-cobalt-manganese element total amount in the spherical high-nickel cathode material precursor and the nickel-cobalt-manganese element total amount in the solution is 0.5) and citric acid (by 1% of the positive electrode material quality), and prepare in Mix evenly in lithium-nickel-cobalt-manganese solution, stir to form a suspension, and then spray dry the mixture at 200°C to obtain a precursor with a core-shell structure;

[0027] b. Preparation of a lithium ion positive electrode...

Embodiment 3

[0029] a. Disperse the precursor of the spherical high-nickel positive electrode material into the solution system containing lithium, nickel, cobalt, and manganese: the acetate of lithium, nickel, manganese, and cobalt is used as the raw material, and the molar ratio of lithium, nickel, cobalt, and manganese is 6.24:1:1:1 (wherein the molar ratio of nickel element in the three elements of nickel, cobalt and manganese is 1 / 3), dissolved in deionized water; then take an appropriate amount of spherical high-nickel cathode material precursor Ni 0.8 co0.1 mn 0.1 (OH) 2 (the mol ratio of the nickel-cobalt-manganese element total amount in the spherical high-nickel cathode material precursor and the nickel-cobalt-manganese element total amount in the solution is 1) and polyethylene glycol (by 10% of the positive electrode material quality), and in the preparation Mix evenly in a good lithium-nickel-cobalt-manganese solution, stir to form a suspension, and then spray-dry the mixture...

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Abstract

The invention discloses a method for preparing a lithium ion battery anode material with a concentration gradient. The method comprises the following steps of: diffusing a spherical high-nickel material in a solution containing lithium, nickel, cobalt and manganese by using a proper dispersing agent; then preparing a precursor in a nuclear shell structure by using a spray drying method; and finally, combining a proper roasting system so as to enable a nickel element of a precursor nuclear layer to be diffused to a shell layer to form a concentration gradient layer. The anode material has stable properties, high charge-discharge capacitance, good circulating property, good heat stability, security and high stability, and can be suitable for being used in low-temperature and high-temperature working environments.

Description

technical field [0001] The invention belongs to the field of lithium ion battery materials and preparation methods thereof, and in particular relates to a preparation method of lithium ion battery cathode materials with concentration gradients. Background technique [0002] With the increasingly prominent energy and environmental issues and the rapid development of modern technology, it is urgent to improve battery performance. Lithium-ion batteries have become people's first choice due to their high operating voltage, long cycle life, high energy density, and no environmental pollution. As the positive electrode material, one of the most critical components in lithium-ion batteries, the currently commercialized positive electrode materials mainly include lithium cobalt oxide (LiCoO 2 ), lithium nickelate (LiNiO 2 ), lithium manganate (LiMnO 2 ) and nickel-cobalt-manganese ternary materials (LiNi 1-x-y co x mn y o 2 (0≤x, y≤1, x+y≤1)), spinel lithium manganate (LiMn ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122Y02E60/10
Inventor 王志兴贺振江郭华军李新海胡启阳张云河彭文杰
Owner CENT SOUTH UNIV
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