Preparation method of multi-element cathode material coated by graphene

A graphene coating, cathode material technology, applied in the direction of positive electrodes, electrical components, battery electrodes, etc., can solve the problems affecting the commercial application of materials, general cycle performance, etc., achieve high specific capacity, improve activity and capacity, good The effect of stability

Inactive Publication Date: 2015-03-04
夏林美
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cycle performance of the material is average, which affects the commercial application of the material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The active material of this embodiment has the following chemical formula 0.7LiNi 0.75 co 0.25 o 2 .0.3LiMn 0.3 Al 0.7 o 2 .

[0019] Prepare an acetic acid solution with a concentration of 1mol / L, mix nickel sulfate and cobalt sulfate according to a molar ratio of 0.75:0.25, and then dissolve them in deionized water to form a mixed nitrate solution with a total concentration of metal ions of 3mol / L. Put the above acetic acid solution in In a stirred reactor, stir vigorously, drop the mixed salt solution into the reactor, control and adjust the temperature of the reaction liquid in the reactor and keep it at 55°C, after the addition is completed, continue to stir and age, the amount of acetic acid solution It should be enough to make all nickel and cobalt ions generate nickel-cobalt acetate; solid-liquid separation, wash the solid product obtained by solid-liquid separation with deionized water, and dry the washed product to obtain nickel-cobalt acetate powder, and...

Embodiment 2

[0024] The active material of this embodiment has the following chemical formula 0.65LiNi 0.55 co 0.45 o 2 .0.35LiMn 0.3 Al 0.7 o 2 .

[0025] Prepare an acetic acid solution with a concentration of 1.5mol / L, mix nickel sulfate and cobalt sulfate according to a molar ratio of 0.55:0.45, and then dissolve them in deionized water to form a mixed nitrate solution with a total concentration of metal ions of 4mol / L. Place in a stirred reactor, stir vigorously, drop the mixed salt solution into the reactor, control and adjust the temperature of the reaction liquid in the reactor and keep it at 60°C, after the addition is completed, continue to stir and age, in which the acetic acid solution The amount should be enough to make all nickel and cobalt ions generate nickel-cobalt acetate; solid-liquid separation, washing the solid product obtained by solid-liquid separation with deionized water, drying the washed product to obtain nickel-cobalt acetate powder, and the nickel-cobalt ...

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Abstract

The invention relates to a preparation method of multi-element cathode material coated by graphene. The active material of the multi-element cathode material comprises an inner layer and an outer layer, wherein the active material has the following chemical formula (1-a) LiNi1-xCoxO2.aLiMn0.3Al0.7O2, wherein a is equal to 0.3-0.35, and the x is equal to 0.25-0.45. The method comprises the following steps: (1) preparing the active material; (2) preparing graphene derivate materials; (3) coating the active material by the graphene derivate materials. The multi-element cathode material prepared by the method disclosed by the invention adopts a two-layer structures with various component matching ratios, the proportion of the nickel in the inner layer is the highest, so that the high capacity of the material is ensured; the outer layer has higher cobalt content, so that the cycling stability of the material is ensured; finally, another layer of graphene derivate material is adopted for coating the active material, so that the activity and the capacity of the material are further improved. Therefore, when the cathode materials are applied to lithium batteries, the specific capacity is higher, and the stability is good.

Description

technical field [0001] The invention relates to a preparation method of a graphene-coated multi-element cathode material. Background technique [0002] With the development of various new energy sources, various electronic devices, such as portable electronic devices and electric vehicles, have more and more demands for large-capacity and high-power chemical power supplies. [0003] Currently commercialized positive electrode materials mainly include lithium cobalt oxide (LiCoO 2 ), lithium nickelate (LiNiO 2 ), lithium manganate (LiMnO 2 ) and nickel-cobalt-manganese ternary materials. Layered lithium cobalt oxide cathode material is the earliest commercialized lithium-ion battery. Although it has high energy density, it has high cost and relatively large environmental pollution; spinel lithium manganese oxide cathode material has low cost and high safety, but It has low specific capacity and poor high temperature performance; layered lithium nickelate cathode material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/583
CPCH01M4/1391H01M4/505H01M4/525H01M4/62H01M2004/028Y02E60/10
Inventor 宫香娥
Owner 夏林美
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