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A lithium-rich/3d graphene composite cathode material

A composite cathode material and graphene composite technology, applied in the field of electrochemistry, can solve the problem of low discharge specific capacity performance of the material, and achieve the effects of good cycle stability, good cycle performance, and good repeatability of mass production.

Active Publication Date: 2016-05-18
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, most of the preparation of manganese-based solid solution materials adopts coprecipitation method, and some researchers use sol-gel method, solid-phase method, combustion method and hydrothermal method to prepare manganese-based solid solution materials, but the discharge of the obtained materials Low specific capacity performance

Method used

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  • A lithium-rich/3d graphene composite cathode material
  • A lithium-rich/3d graphene composite cathode material
  • A lithium-rich/3d graphene composite cathode material

Examples

Experimental program
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Embodiment 1

[0036] A lithium-rich / 3D graphene composite positive electrode material, the molecular formula of the composite positive electrode material is Li 1.2 mn 0.54 co 0.13 Ni 0.13 o 2 / 3D graphene; it is obtained by the following steps:

[0037] 1) Prepare a mixed aqueous solution A of manganese acetate, nickel acetate and cobalt acetate according to the molar ratio of Mn, Ni and Co at 0.54:0.13:0.13 (the sum of the molar concentrations of Mn, Ni and Co is 1 mol / L), Prepare a urea aqueous solution B with a concentration of 5 mol / L, then add solutions A and B to a three-necked bottle pre-installed with a uniformly dispersed graphene oxide aqueous solution at a volume ratio of 1:8, and mix to form a precursor solution;

[0038] 2) Heat the precursor solution, and add dimethyl sulfoxide to adjust the temperature to 107°C during the heating process, reflux for 10 hours, cool to room temperature after the reaction, age for 1 hour, filter with suction, and use absolute ethanol and dei...

Embodiment 2

[0043] A lithium-rich / 3D graphene composite positive electrode material, the molecular formula of the composite positive electrode material is Li 1.3 mn 0.35 co 0.14 Ni 0.21 o 2 / 3D graphene; it is obtained by the following steps:

[0044] 1) Prepare a mixed aqueous solution A of manganese nitrate, cobalt nitrate and nickel nitrate according to the molar ratio of Mn, Co and Ni at 0.35:0.14:0.21 (the sum of the molar concentrations of Mn, Co and Ni is 1 mol / L), Prepare an aqueous urea solution B with a concentration of 5 mol / L, then add solutions A and B to a three-neck bottle pre-installed with a uniformly dispersed 3D graphene aqueous solution at a volume ratio of 1:3, and mix to form a precursor solution;

[0045] 2) Heating the precursor solution, and adjusting the temperature to 97°C by adding DMSO during the heating process, reflux reaction for 20h, cooling to room temperature after the reaction, aging for 1h, suction filtration, washing with absolute ethanol and deio...

Embodiment 3

[0049] A lithium-rich / 3D graphene composite positive electrode material, the molecular formula of the composite positive electrode material is Li 1.4 mn 0.3 co 0.06 Ni 0.24 o 2 / 3D graphene; it is obtained by the following steps:

[0050] 1) Prepare a mixed aqueous solution A of manganese chloride, cobalt chloride and nickel chloride according to the molar ratio of Mn, Co and Ni at 0.3:0.06:0.24 (the sum of the molar concentrations of Mn, Co and Ni is 1mol / L), prepare urea aqueous solution B with a concentration of 5mol / L, and then add solutions A and B to a three-necked bottle pre-installed with a uniformly dispersed 3D graphene aqueous solution at a volume ratio of 1:4, and mix to form a precursor solution;

[0051] 2) Heat the precursor solution, and adjust the temperature to 117°C by adding NMP during the heating process, reflux for 8 hours, cool to room temperature after the reaction, age for 1 hour, suction filter, and alternately wash with absolute ethanol and deio...

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Abstract

The invention relates to a high-capacity lithium-rich / 3D graphene composite cathode material, the molecular formula of which is Li1+x[Mn1-y-z(CoyNiz?)]1-xO2 / 3D graphene, wherein, 0.02≤x≤0.6, 0< y<1, 0<z<1, and 0<1-y-z<1. During the preparation, the mixed solution of transition metal, urea and high boiling point solvent is prepared, and it is added into the uniformly dispersed graphene oxide or 3D graphene solution, and the precursor is obtained by reflux at a high temperature of 95-200 °C, and then the precursor It can be obtained by mixing with lithium salt in appropriate proportion, and going through high-temperature solid state. The positive electrode material has a small and uniform particle size, uniform element distribution, high electrochemical activity, good cycle performance and high rate electrochemical performance, and excellent comprehensive performance.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and in particular relates to a high-capacity lithium-rich / 3D graphene composite positive electrode material suitable for lithium-ion batteries. Background technique [0002] At present, lithium-ion batteries have been widely used in various digital electronic devices, and have broad application prospects in the fields of electric vehicles and energy storage power stations in the future. People have put forward higher and higher requirements for the next generation of high-performance lithium-ion batteries, which can be summarized as "three highs and two lows": high energy density, high power characteristics, high safety performance, low cost, and low pollution. In terms of cathode materials, there are layered LiMO 2 (M=Mn, Ni, Co), such as LiCoO 2 、LiNi 0.33 mn 0.33 co 0.33 o 2 The discharge specific capacity is only 140~170mAh·g -1 , while spinel LiMn 2 o 4 and olivine LiFeP 4 The theor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/133H01M4/525H01M4/505H01M4/36
CPCH01M4/505H01M4/525H01M4/587H01M10/0525Y02E60/10
Inventor 张林森王力臻金恺张勇
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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