Lithium-rich manganese-based/graphene composite cathode material, preparation method thereof and application thereof

A graphene composite, lithium-rich manganese-based technology, applied in the direction of positive electrodes, battery electrodes, active material electrodes, etc., can solve the problems of poor rate performance, high cost, and large structural influence of lithium-rich manganese-based materials, and achieve the goal of promoting Charge and discharge process and rate performance, preparation method and performance improvement, and the effect of avoiding damage

Inactive Publication Date: 2019-08-23
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the existing problems of lithium-rich material structure influence, complex process and high cost in the existing composite process, and provide a preparation method of lithium-rich manganese-based / graphene positive electrode composite material. The chemical formula of the material is wxya 2 MnO 3 ·(1-x)LiMO 2 @GO, this method is fast and simple, and can improve the shortcomings of poor rate performance of lithium-rich manganese-based materials

Method used

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  • Lithium-rich manganese-based/graphene composite cathode material, preparation method thereof and application thereof
  • Lithium-rich manganese-based/graphene composite cathode material, preparation method thereof and application thereof
  • Lithium-rich manganese-based/graphene composite cathode material, preparation method thereof and application thereof

Examples

Experimental program
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Embodiment 1

[0035] 1) Weigh nickel sulfate, cobalt sulfate, and manganese sulfate, dissolve them in deionized water in turn, and stir magnetically until 2mol / L MSO is formed. 4 Solution A (M=Mn, Ni, Co, wherein the molar ratio of Mn:Ni:Co is 0.58:0.2:0.05) is set aside.

[0036] 2) Add 100ml of deionized water in the reaction kettle as the bottom liquid, respectively control the flow rate of solution A, 0.83mol / L sodium carbonate solution and 0.37mol / L ammonia water to be 1ml / min, and feed together, in an inert atmosphere , kept the temperature at 50°C, and reacted for 12h under the conditions of pH 8, and washed with absolute ethanol and deionized water after cooling until there was no SO 4 2- , centrifuged, and vacuum-dried to obtain spherical precursor powder.

[0037] 3) The dried MCO 3 powder and lithium carbonate (molecular formula Li 2 CO 3 ) After the powder is ground evenly, put it into the muffle furnace. Under the air atmosphere, raise the temperature to 450°C at a rate of 5...

Embodiment 2

[0043] 1) Weigh 0.15 g of the lithium-rich manganese-based positive electrode material prepared by the co-precipitation method into a ball mill jar, add 4.167 ml of graphene dispersion liquid, and replace step (4) in Example 1 with an appropriate amount of absolute ethanol, and the remaining steps and Example 1 Step 1 is the same, and the lithium-rich manganese-based / graphene composite positive electrode material can be obtained.

[0044] The material prepared in this example has a specific capacity of 249.9 mA·h / g for the first charge and discharge under the condition of 30 mA / g, and a capacity retention rate of 78.98%.

Embodiment 3

[0046] 1) Weigh 0.15 g of the lithium-rich manganese-based positive electrode material prepared by the co-precipitation method into a ball mill jar, add 1.935 ml of graphene dispersion liquid, and replace step (4) in Example 1 with an appropriate amount of absolute ethanol, and the remaining steps and Example 1 Step 1 is the same, and the lithium-rich manganese-based / graphene composite positive electrode material can be obtained.

[0047] The material prepared in this example has a specific capacity of 238.1 mA·h / g for the first charge and discharge under the condition of 30 mA / g, and a capacity retention rate of 45.97%.

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Abstract

The invention discloses a lithium-rich manganese-based/graphene composite cathode material, a preparation method thereof and an application thereof. The method comprises the steps of: preparing precursor powders by a coprecipitation method and by using a manganese source, a nickel source, a cobalt source, a complexing agent and a precipitating agent as raw materials; subjecting the obtained precursor powders and a lithium source to two-stage calcination to obtain a lithium-rich manganese-based cathode material; then subjecting the obtained lithium-rich manganese-based cathode material and a graphene dispersion to high-energy ball milling; and obtaining the lithium-rich manganese-based/graphene composite cathode material by drying. In the product prepared by the method, the graphene sheet can be well compounded between the surface of the lithium-rich manganese-based material particle surfaces and the particles, and form a more perfect conductive network around the particles. The cathodematerial improves the charging and discharging process and the electrical conductivity of the lithium ion battery under the premise of maintaining the structural stability, and has a simple process and good repeatability.

Description

technical field [0001] The invention relates to the field of new energy materials, in particular to a preparation method of a lithium-rich manganese-based / graphene composite material and its application as a positive electrode of a lithium-ion battery. Background technique [0002] The current lithium-rich manganese-based cathode material xLi 2 MnO 3 ·(1-x)LiMO 2 (where M is Ni, Co, Mn transition metal, 0≤x≤1) is an ideal cathode material for a new generation of lithium-ion batteries, with high actual discharge specific capacity (theoretical capacity exceeds 300mAh / g), low production cost, and stable use It is high in performance and safety, and is expected to replace lithium cobalt oxide to become the main cathode material in small power fields and small communication applications. However, there are still major challenges for its large-scale practical application. These challenges include the voltage decay of lithium-rich manganese-based layered cathode materials during...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/583H01M10/0525
CPCH01M4/366H01M4/505H01M4/583H01M10/0525H01M2004/028Y02E60/10
Inventor 胡彦杰李春忠江浩路力蒋洁超陈功
Owner EAST CHINA UNIV OF SCI & TECH
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