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A kind of preparation method of layered lithium-rich manganese-based cathode material

A lithium-rich manganese-based, cathode material technology, used in battery electrodes, structural parts, electrical components, etc., can solve the problems of poor comprehensive electrochemical performance, unsatisfactory microscopic morphology, and low tap density of materials, and achieve cycle performance. Excellent, high tap density, high specific capacity

Active Publication Date: 2018-11-13
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The chemical composition of the positive electrode material prepared by the sol-gel method is precise and the chemical uniformity is good, but this preparation method is inefficient, and the microscopic morphology (generally random aggregates) of the prepared material is not ideal, and the tap density Low, so the overall electrochemical performance of the material is poor
These inherent defects limit their application in industrial production

Method used

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  • A kind of preparation method of layered lithium-rich manganese-based cathode material
  • A kind of preparation method of layered lithium-rich manganese-based cathode material
  • A kind of preparation method of layered lithium-rich manganese-based cathode material

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Embodiment 1

[0026] (1) According to the nominal chemical formula of layered lithium-rich manganese-based cathode materials 0.5Li 2 MnO 3 0.5LiMn 1 / 3 Ni 1 / 3 co 1 / 3 o 2 , weigh lithium hydroxide (LiOH·H 2 O) 3.3044g, manganese acetate (Mn(CH 3 COO) 2 4H 2 O) 8.1697g, nickel acetate (Ni(CH 3 COO) 2 4H 2 O) 2.0737g, cobalt acetate (Co(CH 3 COO) 2 4H 2 O) 2.0757g, oxalic acid (C 2 h 2 o 4 2H 2(2) 12.3943g, the transition metal ion acetate that weighs is dissolved in deionized water, is mixed with 250mL acetate solution, the oxalic acid that takes is dissolved in deionized water, is mixed with 350mL oxalic acid solution, will weigh Lithium hydroxide was added to the prepared oxalic acid solution, and continued to stir rapidly. After the lithium hydroxide was completely dissolved, the prepared acetate solution was added, and finally a small amount of deionized water was added to adjust the total volume of the reaction system to 645mL. The total concentration of metal ions is ...

Embodiment 2

[0032] (1) According to the nominal chemical formula 0.4Li of layered lithium-rich manganese-based cathode materials 2 MnO 3 0.6LiMn 0.5 Ni 0.5 o 2 , weigh lithium carbonate (Li 2 CO 3 ) 2.7155g, manganese acetate (Mn(CH 3 COO) 2 4H 2 O) 8.5782g, nickel acetate (Ni(CH 3 COO) 2 4H 2 O) 3.7326g, oxalic acid (C 2 h 2 o 4 2H 2 (2) 12.0302g, the transition metal ion acetate that takes by weighing is dissolved in deionized water, is mixed with the acetate solution of 350mL, the oxalic acid that takes by weighing is dissolved in deionized water, is mixed with the oxalic acid solution of 300mL, weighs The lithium carbonate that got was added in the prepared oxalic acid solution, and continued to stir rapidly. After the lithium carbonate was completely dissolved, the prepared acetate solution was added, and finally a small amount of deionized water was added to adjust the total volume of the reaction system to 750mL. The total concentration of metal ions is about 0.165mo...

Embodiment 3

[0038] (1) According to the nominal chemical formula of layered lithium-rich manganese-based cathode materials 0.6Li 2 MnO 3 0.4LiMn 0.3 Ni 0.3 co 0.4 o 2 , weigh lithium acetate (CH 3 COOLi·2H 2 O) 8.5697g, manganese acetate (Mn(CH 3 COO) 2 4H 2 O) 8.8232g, nickel acetate (Ni(CH 3 COO) 2 4H 2 O) 1.4930g, cobalt acetate (Co(CH 3 COO) 2 4H 2 O) 1.9932g, oxalic acid (C 2 h 2 o 4 2H 2 (2) 12.7583g, the transition metal ion acetate that weighs is dissolved in deionized water, is mixed with 250mL acetate solution, the oxalic acid that takes is dissolved in deionized water, is mixed with 300mL oxalic acid solution, will weigh Add lithium acetate to the prepared oxalic acid solution, and continue to stir rapidly. After the lithium acetate is completely dissolved, add the prepared acetate solution, and finally add a small amount of deionized water to adjust the total volume of the reaction system to 600mL. The total concentration is about 0.22mol / L;

[0039] (2) Mo...

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Abstract

The invention discloses a preparation method of a layered lithium-enriched manganese-based positive electrode material, belonging to the technical field of material synthesis. The method mainly comprises the steps of preparing needed transition metal acetate and oxalic acid into a water solution, dissolving a needed lithium source into an oxalic acid solution, adding the tradition metal acetate into the oxalic acid solution containing the lithium source, carrying out constant-temperature water bath, continuously magnetically stirring to obtain paste; drying the paste, calcining and carrying out high-temperature heat treatment to obtain the layered lithium-enriched manganese-based positive electrode material. The layered lithium-enriched manganese-based positive electrode material prepared by the invention has high coulombic efficiency, large specific capacity, good rate performance, excellent cycle performance, meanwhile has simple process, is low in cost, and can be directly used for industrial production.

Description

technical field [0001] The invention belongs to the technical field of material synthesis, and relates to a method for preparing a positive electrode material of a lithium ion battery, in particular to a method for synthesizing a layered lithium-rich manganese-based oxide containing binary or ternary transition metal ions. Background technique [0002] Lithium-ion batteries have become ideal power sources for portable electronic devices due to their high energy density, good safety, long cycle life, and environmental friendliness. With the rapid development of new energy vehicles, lithium-ion batteries as the power source of electric vehicles show attractive application prospects. However, as the power source of electric vehicles, lithium-ion batteries must have higher energy density and power density under the premise of ensuring excellent safety and lower cost. The performance, safety and cost of lithium-ion batteries are mainly determined by the cathode material. From t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/1391H01M10/0525
CPCH01M4/1391H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 方道来王海岸黄朋飞蒋柱徐天然郑翠红
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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