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Positive active material and preparation method thereof

A positive electrode active material and a technology of positive electrode materials, applied in the field of positive electrode active materials and their preparation, can solve the problems of poor cycle performance and low initial discharge efficiency, and achieve improved cycle performance, simple and easy preparation method, and improved charge and discharge efficiency Effect

Active Publication Date: 2011-11-09
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is: in the prior art, the element doping of the ternary material causes the disadvantages of low initial discharge efficiency and poor cycle performance; thereby providing a positive electrode with high initial charge and discharge efficiency and good cycle performance active material

Method used

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  • Positive active material and preparation method thereof
  • Positive active material and preparation method thereof
  • Positive active material and preparation method thereof

Examples

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preparation example Construction

[0024] A method for preparing the above-mentioned cathode material, comprising the steps of:

[0025] (1) Carry out step S: Add solution A and solution C to the bottom liquid to precipitate, and wait for the nickel ion in the bottom liquid to be lower than 2000ppm; then add solution B and solution C to the bottom liquid to precipitate, and wait for the bottom liquid to Nickel ions below 2000ppm;

[0026] Repeat step S, and the number of repetitions is not less than 5 times; during the precipitation process, control the pH of the bottom solution to 10.5-12.0;

[0027] Solution A is a solution containing nickel ions, cobalt ions, and manganese ions, and solution B is a solution of nickel ions, cobalt ions, and doping ions; the concentration ratio of nickel ions and cobalt ions in the solution A and solution B is the same;

[0028] Solution C is an alkali solution, and the bottom liquid is a complexing agent solution;

[0029] (2) After the precipitation is completed, age to ob...

Embodiment 1

[0059] Embodiment 1 Best Embodiment

[0060] Solution A: Dissolve nickel sulfate, cobalt sulfate and manganese sulfate in water to make a solution, in which Ni 2+ 、Co 2+ , Mn 2+ The concentration is 2 / 3mol / L

[0061] Solution B: Dissolve nickel sulfate, cobalt sulfate and magnesium sulfate in water to make a solution, in which Ni 2+ 、Co 2+ , Mg 2+ The concentration is 2 / 15mol / L

[0062] Solution C: 5.6mol / L NaOH, 4.8mol / L NH 3 ·H 2 Mixed solution of O

[0063] Bottom solution: 2.0mol / L NH 3 ·H 2 o

[0064] Pour 20L of the bottom liquid into a 100L reactor, and pass nitrogen gas to exhaust the reactor and the oxygen in the bottom liquid. And continue feeding nitrogen to ensure the inert atmosphere in the reactor.

[0065] Add 2.8L of solution A and solution C to the reaction kettle in parallel, and detect Ni in the bottom solution 2+ , until less than 2000ppm. Then 1.1L of solution B and solution C were added to the reaction kettle in parallel, and the Ni in the ...

Embodiment 2

[0071] The difference from Example 1 is that solution B is made by dissolving nickel sulfate, cobalt sulfate and aluminum manganate in water, wherein Ni 2+ 、Co 2+ 、Al 3+ The concentration is 2 / 15mol / L.

[0072] Other parts are with embodiment 1.

[0073] The obtained positive electrode material is denoted as S2.

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Abstract

The invention belongs to the technical field of lithium ion batteries and in particular discloses a positive active material and a preparation method thereof. The positive active material comprises ternary composite oxides, the general formula of the ternary composite oxides is LiaNibCocMndMeO2, wherein M is a doped chemical element, a is more than or equal to 0.97 and less than or equal to1.06, b+c+d+e=1 and e / d is more than or equal to 0.05 and less than or equal to 0.15. The preparation method for the positive active material comprises the following steps: carrying out step S: adding a solution A and a solution C to a base solution for depositing in parallel, and adding a solution B and the solution C to the base solution for depositing in parallel; repeating the step S, then carrying out aging and finally sintering with a lithium source to obtain the positive active material. The element-doped ternary material provided by the invention is improved greatly in the first charge-discharge efficiency and the cycle performance. The preparation method of the positive active material is simple and practicable and is applied to mass production.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a positive electrode active material and a preparation method thereof. Background technique [0002] Lithium-ion batteries are more and more widely used in portable electronic products such as mobile phones and digital cameras due to their advantages of high energy and no pollution. They are also used as backup energy for large-scale equipment such as automobiles and space stations. , the requirements for its various performances are also constantly increasing. [0003] The widely used cathode active material is generally LiCoO 2 and other Co-based active materials. But Co is toxic and expensive; LiCoO 2 When Li ions are extracted, the structure is Li 1-x CoO 2 , when x>0.5, its structure will undergo irreversible changes, and the cycle performance will decrease significantly. At the same time the existing LiCoO 2 The actual use specific capaci...

Claims

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Application Information

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IPC IPC(8): H01M4/131H01M4/1391H01M4/505H01M4/525
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 王磊游军飞
Owner BYD CO LTD
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