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Graphene-coated nickel lithium manganate preparation method

A technology of graphene coating and lithium nickel manganese oxide, which is applied in chemical instruments and methods, nickel compounds, inorganic chemistry, etc., can solve the problems of increasing resistance, corroding the surface of materials, reducing specific capacity, etc., to reduce operating steps, High specific capacity and good electrical conductivity

Active Publication Date: 2015-08-12
YANCHENG TEACHERS UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above coating materials block the direct contact between the lithium nickel manganese oxide material and the electrolyte, there are problems such as corroding the surface of the material, increasing the resistance, and reducing the specific capacity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A preparation method of lithium nickel manganese oxide coated with graphene as the positive electrode material of lithium ion battery. In this example, 18.30 g (0.10 mol) of LiNi coated with graphene 0.5 mn 1.5 o 4 The positive electrode material specifically includes the following process steps:

[0044] (1) Preparation of lithium nickel manganese oxide precursor

[0045] Weigh nickel acetate (C 4 h 6 o 4 Ni·4H 2 O) 12.44g (0.05mol), manganese acetate (Mn(CH 3 COO) 2 )25.95g (0.15mol), lithium acetate (C 2 h 3 LiO 2 ) 6.60g (0.1mol), mixed in 50ml of distilled water, added 0.6g of polyvinylpyrrolidone (PVP) and 3ml of citric acid, heated the solution at 40°C with constant magnetic stirring, and reacted for 6 hours before use.

[0046] (2) Configure graphene DMF solution

[0047] Weigh 0.08g of graphene flakes and disperse in 160g of dimethylformyl (DMF) amine solution at 110°C and keep the temperature at 110°C for later use.

[0048] (3) Configure lithiu...

Embodiment 2

[0056] A preparation method of lithium nickel manganese oxide coated with graphene as the positive electrode material of lithium ion battery. In this example, 36.60 g (0.20 mol) of LiNi coated with graphene 0.5 mn 1.5 o 4 The positive electrode material specifically includes the following process steps:

[0057] (1) Preparation of lithium nickel manganese oxide precursor

[0058] Weigh nickel oxalate (C 2 o 4 Ni) 14.67g (0.1mol), manganese oxalate (MnC 2 o 4 )42.89g (0.3mol), lithium oxalate (Li 2 C 2 o 4 ) 10.19g (0.1mol), mixed in 100ml distilled water, added 1.0g polyvinylpyrrolidone (PVP) and 6ml citric acid, heated the solution at 60°C with constant magnetic stirring, reacted for 3.5h and then set aside.

[0059] (2) Configure graphene DMF solution

[0060] Weigh 0.16g of graphene flakes and disperse them in 300g of dimethylformyl (DMF) amine solution at 160°C and keep the temperature at 160°C for later use.

[0061] (3) Configure lithium nickel manganese oxi...

Embodiment 3

[0069] A preparation method of graphene-coated lithium nickel manganese oxide, a positive electrode material for lithium-ion batteries. In this example, graphene-coated 54.90 g (0.30 mol) LiNi 0.5 mn 1.5 o 4 The positive electrode material specifically includes the following process steps:

[0070] (1) Preparation of lithium nickel manganese oxide precursor

[0071] Weigh 22.01g (0.15mol) of nickel oxalate (C2O4 Ni), 64.34g (0.45mol) of manganese oxalate (MnC2O4), lithium acetate (C 2 h 3 LiO 2 ) 19.80g (0.3mol), mixed in 150ml of distilled water, added 1.5g of polyvinylpyrrolidone (PVP) and 9ml of citric acid, heated the solution at 80°C with constant magnetic stirring, and reacted for 2 hours before use.

[0072] (2) Configure graphene DMF solution

[0073] Weigh 0.24g of graphene flakes and disperse in 450g of dimethylformyl (DMF) amine solution at 170°C and keep the temperature at 170°C for later use.

[0074] (3) Configure lithium nickel manganese oxide precursor...

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Abstract

The invention relates to a lithium ion battery cathode material graphene-coated nickel lithium manganate preparation method. The lithium ion battery cathode material graphene-coated nickel lithium manganate preparation metho belongs to the lithium ion battery technical field, and comprises the following steps: (1) preparing a nickel lithium manganate precursor; (2) preparing a graphene dimethyl formamide solution; (3) dropping the graphene dimethyl formamide solution obtained by the step (2) into the nickel lithium manganate precursor obtained by the step (1), and volatilizing to dry to obtain a nickel lithium manganate precursor mixed with graphene sheets; and (4) calcining the nickel lithium manganate precursor mixed with the graphene sheets obtained by the step (3) to prepare the lithium ion battery cathode material graphene-coated nickel lithium manganate. The lithium ion battery cathode material graphene-coated nickel lithium manganate preparation method has the advantages of low cost, simple process conditions, high covering rate, high purity, high specific capacity and good cyclic stability and the like.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a preparation method of a graphene-coated lithium nickel manganese oxide material. Background technique [0002] In recent years, with the rapid development of pure electric vehicles and hybrid electric vehicles, high-energy, long-life, and low-cost chemical power sources are particularly urgent. Lithium-ion batteries are characterized by their high operating voltage, large specific energy, long cycle life, and low pollution. And other advantages stand out among many chemical power sources. Among the various components of lithium-ion batteries, the performance of the positive electrode material determines whether the overall performance of the battery is superior or not, because lithium nickel manganese oxide (LiNi 0.5 mn 1.5 o 4 ) materials have the advantages of high voltage platform, high energy density, low price, abundant resources, and environmental friend...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00C01B31/04H01M4/505H01M4/525H01M4/62
CPCY02E60/10
Inventor 倪萍孙思宇秦莉蒲小明杨丹王佳
Owner YANCHENG TEACHERS UNIV
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