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Novel surface carbon modified layered lithium-rich ternary positive electrode composite material and preparation method thereof

A lithium-rich material and layered technology, which is applied in the field of layered ternary lithium-rich materials, can solve the problems of poor structural stability of composite materials, restrictions on large-scale commercial applications, and poor conductivity of lithium-rich materials. Suppression of the Jahn-Teller effect, small diameter, and high tap density

Active Publication Date: 2019-05-03
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the layered ternary lithium-rich material has the problem of transforming from the layered structure to the spinel structure during the charging and discharging process, which reduces the material capacity and voltage attenuation.
In addition, Mn in lithium-rich materials 3+ There is a Jahn-Teller effect, and the contact of the active material with the electrolyte will cause the dissolution of Mn, and the conductivity of lithium-rich materials is not good
The above problems limit its large-scale commercial application
[0004] Currently for the synthesis of 0.5Li 2 MnO 3 0.5LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 A lot of research has been done on composite materials, including co-precipitation method, solid phase method, sol-gel method, etc., but the structural stability of composite materials prepared by these methods is not good

Method used

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  • Novel surface carbon modified layered lithium-rich ternary positive electrode composite material and preparation method thereof
  • Novel surface carbon modified layered lithium-rich ternary positive electrode composite material and preparation method thereof
  • Novel surface carbon modified layered lithium-rich ternary positive electrode composite material and preparation method thereof

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Effect test

Embodiment 1

[0038] KMnO 4 Mix evenly with glucose according to the substance ratio of 5:1, put it into a high-pressure reactor, stir for 15 minutes, and continue to ultrasonically vibrate for 120 minutes. Put it into a blast for hydrothermal reaction, the reaction time is 5h, and the temperature is 170°C. Pour out the reaction solution, centrifuge, discard the supernatant, wash the remaining solid with ethanol and aqueous solution and centrifuge several times, discard the supernatant, and dry at 40°C to obtain β-MnO 2 , the resulting 0.55g β-MnO 2 As the manganese source, nickel nitrate, cobalt nitrate and lithium carbonate were respectively used as the nickel source, and the ratio of the cobalt source and the lithium source was based on the molar ratio of the contained metal elements, specifically 4:1:1:9.2, and ball milled for 4 hours. The ground powder was calcined in an air atmosphere at a temperature of 800 °C for 8 h to obtain 0.5 Li 2 MnO 3 0.5LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 com...

Embodiment 2

[0041] KMnO 4 Mix evenly with glucose according to the substance ratio of 7:1, put it into a high-pressure reactor, stir for 60 minutes, and continue to ultrasonically shake for 30 minutes. Put it into a blast for hydrothermal reaction, the reaction time is 3 hours, and the temperature is 190°C. Pour out the reaction solution, centrifuge, discard the supernatant, wash the remaining solid with ethanol and aqueous solution and centrifuge several times, discard the supernatant, and dry at 70°C to obtain β-MnO 2 , the resulting 0.6g β-MnO 2 As the manganese source, nickel acetate, cobalt acetate and lithium hydroxide were used as nickel source respectively, and the ratio of cobalt source and lithium source was based on the molar ratio of the contained metal elements, specifically 3.9:1:1:10.4, and ball milled for 6 hours. The ground powder was calcined in an air atmosphere at a temperature of 700 °C for 12 h to obtain 0.5 Li 2 MnO 3 0.5LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 . 0.05g...

Embodiment 3

[0044] KMnO 4 Mix evenly with glucose according to the substance ratio of 7:1, put it into a high-pressure reactor, stir for 50 minutes, and continue to ultrasonically shake for 30 minutes. Put it into a blast for hydrothermal reaction, the reaction time is 3 hours, and the temperature is 200°C. Pour out the reaction solution, centrifuge, discard the supernatant, wash the remaining solid with ethanol and aqueous solution and centrifuge several times, discard the supernatant, and dry at 70°C to obtain β-MnO 2 , the resulting 0.585g β-MnO 2 As the manganese source, nickel sulfate, cobalt sulfate and lithium carbonate were respectively used as nickel source, cobalt source and lithium source, and the ratio was based on the molar ratio of the contained metal elements, specifically 4:1:1:9.8, and ball milled for 5 hours. The ground powder was calcined in an air atmosphere at a temperature of 850 °C for 11 h to obtain 0.5 Li 2 MnO 3 0.5LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 . 0.05g gluc...

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Abstract

The invention discloses a novel surface carbon modified layered lithium-rich ternary positive electrode composite material and a preparation method thereof. The invention uses a template method to prepare the surface carbon modified layered lithium-rich ternary material, and solves the problem of structural stability of the layered lithium-rich ternary material. The synthesized material has a highspecific capacity and good cycle stability as a lithium ion battery positive electrode material.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion batteries, in particular to a layered ternary lithium-rich material with surface carbon coating and modification. Background technique [0002] Lithium-ion battery layered ternary lithium-rich cathode material xLi 2 MnO 3 ·(1-x)LiMO 2 (M=Co, Ti, Ni, etc.) The theoretical capacity can be as high as 300mAh g -1 , the actual achievable specific capacity can also be greater than 200mAh g -1 . Because the layered ternary lithium-rich material has the characteristics of high capacity and long cycle when charging and discharging at high potential, it has a high energy density and can be used as an energy density 300Wh kg -1 The above candidate materials for the positive electrode of lithium-ion batteries, and these materials are based on Mn elements, so they have unique advantages in terms of raw materials, cost, and thermal safety. [0003] However, the layered ternary l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCY02E60/10
Inventor 王连邦苏利伟傅江浩吴昊
Owner ZHEJIANG UNIV OF TECH
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