Graphene-based composite ternary material, preparation method thereof, and lithium ion battery

A ternary material and graphene-based technology, applied in the field of lithium-ion batteries, can solve the problems of poor electrode processing performance and low material conductivity, improve particle compaction resistance, improve reaction interface, improve high rate and cycle performance effect

Active Publication Date: 2014-07-02
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a graphene-based composite ternary material with improved processing performance and high-rate performance and a preparation method thereof. The graphene-based composite ternary material has primary particles or a small amount of agglomerated secondary particles structure, so as to overcome the problems of low material conductivity and poor electrode processing performance in the prior art

Method used

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  • Graphene-based composite ternary material, preparation method thereof, and lithium ion battery
  • Graphene-based composite ternary material, preparation method thereof, and lithium ion battery
  • Graphene-based composite ternary material, preparation method thereof, and lithium ion battery

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preparation example Construction

[0033] Such as figure 2 as shown, figure 2 It is the flowchart of the preparation method of a kind of graphene-based composite ternary material of the present invention, and the method comprises the steps:

[0034] Step S01, preparing a graphene dispersion;

[0035] Step S02, mixing salts containing nickel, cobalt, and manganese with the graphene dispersion to form a mixed solution;

[0036] Step S03, adding a precipitating agent to the mixed solution in step S02 for reaction to obtain a graphene-based ternary precursor;

[0037] Step S04, mixing the lithium salt and the graphene-based ternary precursor by ball milling, sintering in a protective atmosphere, and then grading the crushed powder to obtain a graphene-based composite ternary material.

[0038] Wherein, the preparation of the graphene dispersion includes the following steps: dissolving one or more of polyacrylic acid, polyvinyl alcohol, and polyvinylpyrrolidone in deionized water, and stirring to obtain a dispers...

Embodiment 1

[0045] Step 1, preparation of graphene dispersion

[0046] Dissolve 1g of polyvinylpyrrolidone (PVP) in 100ml of deionized water, stir in a water bath until the PVP is completely dissolved, and obtain a dispersant solution with a solution concentration of 10mg / ml;

[0047] Take 0.1 g of graphene oxide powder and add it to 100 ml of dispersant solution, and disperse it ultrasonically for 120 minutes to obtain a 1 mg / ml tan monodisperse graphene dispersion. The number of graphene sheets selected is composed of a single layer or a multilayer graphene sheet with a layer number less than 10 layers.

[0048] Step 2. Preparation of graphene composite ternary precursor

[0049] Weigh NiSO according to the ratio of Ni:Co:Mn=1:1:1 4 ·6H 2 O. CoSO 4 ·7H 2 O, MnSO 4 ·H 2 O each 0.05mol, add to a certain amount (for example: 0ml, 75ml, 150ml, 300ml, 450ml) of monodisperse graphene dispersion liquid and deionized water, and mix to obtain graphene / nickel with a sum of cations of 0.15m...

Embodiment 2

[0064] Step 1, preparation of graphene dispersion

[0065] The method is similar to Step 1 of Example 1, and a 1 mg / ml tan monodisperse graphene dispersion is prepared. Among them, only the selected dispersant solution is polyacrylic acid (PAA) with a solution concentration of 10 mg / ml.

[0066] Step 2. Preparation of graphene composite ternary precursor

[0067] Weigh Ni(NO) by adjusting the ratio of Ni:Co:Mn=5:2:3 3 ) 2 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O, Mn(NO 3 ) 2 4H 2 Each 0.05mol of O is added to a certain amount of 150ml monodisperse graphene dispersion and deionized water, and the proportioning to obtain the cation sum is the graphene / nickel-cobalt-manganese ion mixed solution of 0.15mol / L; configure 1mol / L of Na 2 CO 3 Solution 150ml; Graphene / nickel-cobalt-manganese ion mixture and Na 2 CO 3 The solution is dropped into the reactor simultaneously, the addition rate and the high-speed stirring rate of the two solutions are controlled, the pH value of the react...

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Abstract

The invention provides a graphene-based composite ternary material. The ternary material comprises graphene and a nickel-cobalt-manganese ternary material, wherein the graphene is prepared by sintering oxidized graphene, is composed of single-layered graphene slices or multi-layered graphene slices whose layer number is less than 10, and accounts for 0.1% to 10.0% of the total weight of the composite ternary material; and the nickel-cobalt-manganese ternary material has a primary particle structure or a secondary particle structure, has a molecular formula of Li(Ni<x>Co<y>Mn<z>)O2, wherein the sum of x, y, and z is equal to 1, and x, y, and z are all in a range of 0 to 1, and accounts for 90.0% to 99.9% of the total weight of the composite ternary material. The graphene slices are freely stacked in the graphene, thus conductive nets and cavities are formed, and the nickel-cobalt-manganese ternary material particles are embedded into the cavities between the nano graphene layers through a chemical precipitation method. The invention also provides a preparation method of the graphene-based composite ternary material.

Description

technical field [0001] The invention relates to a lithium-ion battery, in particular to a graphene-based composite ternary material, a preparation method thereof, and a lithium-ion battery containing the graphene-based composite ternary material. Background technique [0002] Lithium-ion batteries have the advantages of high specific energy, high power density, and long cycle life, and are currently the main choice of rechargeable batteries for portable electronic products. Due to the low specific capacity of cathode materials and the need to additionally bear the irreversible capacity loss of the anode, the research and improvement of cathode materials has always been a key issue in the research of lithium-ion batteries. Layered nickel-cobalt-manganese ternary materials have the advantages of high specific energy, low cost, stable cycle performance, and good safety. The development has become a research hotspot in the field of cathode materials. [0003] Graphene, as a ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M10/0525B82Y30/00
CPCY02E60/122B82Y30/00H01M4/364H01M4/505H01M4/525H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 王平华
Owner HUAWEI TECH CO LTD
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