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A lithium-rich ternary positive electrode material and its green preparation method

A cathode material, lithium-rich technology, applied in the direction of electrical components, battery electrodes, structural parts, etc., can solve the problems of uneven particle size distribution of cathode materials, harm to human health, poor cycle performance, etc. Wastewater discharge, good effect of crystallinity

Active Publication Date: 2022-04-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the sol-gel method has the above-mentioned advantages, the volatilization of ammonia water in the preparation process causes environmental pollution and seriously endangers human health, and the preparation process needs to control pH, which makes the operation complicated, and the particle size distribution of the prepared positive electrode material is uneven. Average, there is a problem of poor cycle performance

Method used

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  • A lithium-rich ternary positive electrode material and its green preparation method
  • A lithium-rich ternary positive electrode material and its green preparation method
  • A lithium-rich ternary positive electrode material and its green preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Preparation of 0.1mol0.5Li 2 MnO 3 0.5LiNi 0.3 mn 0.4 co 0.3 o 2 .

[0034] (1) 0.7g poloxamer and 13.849g ammonium bicarbonate were dissolved in 100mL water to prepare solution A;

[0035] (2) 7.343g of lithium hydroxide (5%) was dissolved in 40mL of water to prepare solution B;

[0036] (3) 13.864g of manganese acetate, 2.989g of nickel acetate, and 3.004g of cobalt acetate were mixed and dissolved in 55mL of water to obtain solution C;

[0037] (4) Add solution B dropwise to solution A at a rate of 1-2 drops / s to form a mixed solution, then add solution C to the mixed solution dropwise at a rate of 1-2 drops / s, add solution A , solution B and solution C total volume of 5% ethanol, stirred for 2 hours to form a stable and uniform mixed solution D;

[0038](5) Transfer the mixed solution D to a stainless steel reaction kettle with a polytetrafluoroethylene liner, raise it from room temperature to 120°C for 8 hours, and cool it naturally to room temperature to o...

Embodiment 2

[0043] Preparation of 0.1mol 0.5Li 2 MnO 3 0.5LiNi 0.325 mn 0.35 co 0.325 o 2 .

[0044] (1) 0.7g poloxamer and 13.849g ammonium bicarbonate were dissolved in 100mL water to prepare solution A;

[0045] (2) 7.343g of lithium hydroxide (5%) was dissolved in 40mL of water to prepare solution B;

[0046] (3) 13.369g of manganese acetate, 3.238g of nickel acetate, and 3.254g of cobalt acetate were mixed and dissolved in 55mL of water to obtain solution C;

[0047] (4) Add solution B dropwise to solution A at a rate of 1-2 drops / s to form a mixed solution, then add solution C to the mixed solution dropwise at a rate of 1-2 drops / s, add solution A 1. Ethylene glycol with a total volume of 5% of solution B and solution C, stirred for 2 hours to form a stable and uniform mixed solution D;

[0048] (5) Transfer the mixed solution D to a stainless steel reaction kettle with a polytetrafluoroethylene liner, raise it from room temperature to 120°C for 8 hours, and cool it naturall...

Embodiment 3

[0053] Preparation of 0.1mol 0.5Li 2 MnO 3 0.5LiN 1 / 3 mn 1 / 3 co 1 / 3 o 2 .

[0054] In addition to using cetyltrimethylammonium bromide of equal mass to replace poloxamer, 48.537g of citric acid instead of 13.849g of ammonium bicarbonate, the amount of manganese acetate used was changed from 13.369g to 16.504g, nickel acetate The amount of cobalt acetate is changed into 2.241g by 4.151g, and the amount of cobalt acetate is changed into 4.172g by 3.254g, and other composition uses and preparation method are identical with example 2 completely.

[0055] The main electrochemical properties of the materials are listed in Table 1.

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Abstract

The invention discloses a lithium-rich ternary positive electrode material and a green preparation method thereof. The method is as follows: adding the prepared nickel cobalt manganate solution and lithium salt solution into the solution in which the surfactant and the precipitant are dissolved, fully stirring the obtained mixed solution for solvothermal reaction, and then using spray drying The precursor powder is prepared, and then calcined to obtain the lithium-rich ternary cathode material xLi 2 MnO 3 · (1‑x)LiMO 2 . The precursor particles obtained by the method are fine, the lithium-rich ternary positive electrode material has uniform particle size distribution, controllable morphology, good crystallinity, and no large amount of waste water is discharged during the preparation process, and the adopted raw materials make no harmful during the calcination process. Gas emission, environmental protection, simple preparation process and easy industrialization; the use of new surfactants effectively makes the slurry evenly dispersed, and a stable mixed phase appears at the edges of the obtained positive electrode material particles, reducing side reactions between the positive electrode material and the electrolyte, The obtained cathode material has important advantages such as high discharge specific capacity and good cycle stability.

Description

technical field [0001] The invention belongs to the field of new energy materials, and in particular relates to a lithium-rich ternary positive electrode material for high-performance lithium-ion batteries and a preparation method for green production thereof. Background technique [0002] With the rapid development of electric vehicles, smart grids and large-scale energy storage, the existing battery system is becoming more and more difficult to meet the needs of people's life and production, and lithium-rich ternary cathode materials (xLi 2 MnO 3 ·(1-x)LiMO 2 , M=Ni, Co, Mn, etc.) is considered to be the most promising cathode material system for high-capacity lithium-ion secondary batteries due to its high specific capacity, high operating voltage, and environmental friendliness. one. At present, the main preparation methods of lithium-rich materials are: high-temperature solid-phase method, sol-gel method, co-precipitation method, solvothermal method, etc., but these ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/10
Inventor 廖世军鲁志远赵莹
Owner SOUTH CHINA UNIV OF TECH
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