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Lithium ion battery composite positive electrode material, and preparation method and application thereof

A composite positive electrode material and lithium-ion battery technology, which is applied in battery electrodes, secondary batteries, hybrid capacitor electrodes, etc., can solve problems affecting applications, poor conductivity and rate performance, and achieve simple and easy-to-control operation steps, excellent Mechanical properties, easy-to-achieve effects

Inactive Publication Date: 2017-07-07
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, with LiCoO 2 Compared to Li[Ni 1-x-y co x mn y ]O 2 Poor conductivity and rate performance, which affects its wider application

Method used

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  • Lithium ion battery composite positive electrode material, and preparation method and application thereof
  • Lithium ion battery composite positive electrode material, and preparation method and application thereof
  • Lithium ion battery composite positive electrode material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: LiNi1 / 3 co 1 / 3 mn 1 / 3 o 2 preparation of

[0029] With Li(CH 3 COO)·2H 2 O is the lithium source, Ni(CH 3 COO) 2 4H 2 O, Co(CH 3 COO) 2 4H 2 O, Mn(CH 3 COO) 2 4H 2 O is Ni source, Co source, Mn source respectively; According to molar ratio Li:(Ni+Co+Mn)=1.1:1 (wherein the molar ratio of Ni:Co:Mn is 1:1:1) weigh corresponding raw material In 50ml deionized water, use this mixed solution as liquid A; then weigh citric acid equimolar to the total metal ions, and dissolve it together with ethylene glycol (the molar ratio of citric acid and ethylene glycol is 1:3) Use 50ml of alcohol as liquid B; add liquid A dropwise into liquid B, and use a water bath to stir magnetically at 60°C to allow citric acid to coordinate with metal ions; after the addition is complete, heat up to 95°C to make the citric acid complex Esterification occurs with ethylene glycol, and the solution becomes a wet gel at this time; then the wet gel is dried in a vacuum drying ove...

Embodiment 2

[0030] Embodiment 2: the preparation of three-dimensional graphene

[0031] (1) 10g acrylic acid type cation exchange resin in 100ml 0.05mol L -1 Soak in nickel acetate solution for 6h;

[0032] (2) Wash the soaked resin to neutral with deionized water, and dry at 60°C for 12 hours;

[0033] (3) Mix the dried resin with ethanol containing 40g KOH, and stir at 80°C until the mixture becomes an inkpad-like mixture;

[0034] (4) Dry the mixture in a drying oven at 70°C for 48 hours, and pulverize the obtained product with a pulverizer;

[0035] (5) Raise the pulverized material to 850°C at a heating rate of 2°C / min under a nitrogen atmosphere, and keep it at 850°C for 2 hours;

[0036] (6) Add the carbonized product to an excess of 3mol L -1 In the HCl, stir more than 12h;

[0037] (7) The stirred product was washed with deionized water until the pH was 7, and dried at 70° C. for 12 hours to obtain the product.

Embodiment 3

[0038] Example 3: LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 / Three-dimensional graphene synthesis and electrode preparation

[0039] LiNi prepared in Example 1 1 / 3 co 1 / 3 mn 1 / 3 o 2 The three-dimensional graphene prepared in Example 2 with a mass fraction of 4% was added to the powder, and LiNi was prepared by mixing ball milling on a high-energy ball mill under nitrogen protection for 6h (850r / min, the ball-to-material ratio was 4:1). 1 / 3 co 1 / 3 mn 1 / 3 o 2 / 3DHPG composite material, the morphology and structure of the composite material are as follows figure 1 and figure 2 Mix the composite material with binder (CMC:SBS=1:1) and conductive agent (acetylene black) at a mass ratio of 8:1:0.45 as shown, add deionized water and stir for 5 hours to obtain a slurry; the slurry The material was evenly coated on aluminum foil, and after drying, it was transferred to a vacuum oven at 100°C for 24 hours. Punch the fabricated pole piece into discs made of activated carbon Copper foi...

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Abstract

The invention belongs to the field of new energy sources, and discloses a lithium ion battery composite positive electrode material, and a preparation method and an application thereof. The composite material is composed of Li[Ni1-x-yCoxMny]O2 and three-dimensional graphene. The surface energy of two-dimensional graphene is high and the two-dimensional graphene is easy to agglomerate, while the three-dimensional graphene has good stability, a large specific surface area and a high utilization rate, and can increase the wettability of the electrode material and improve the energy storage capacity of electrode. The three-dimensional graphene is doped in the Li[Ni1-x-yCoxMny]O2 material to effectively improve the cycle performance and specific capacity of the material. The Li[Ni1-x-yCoxMny]O2 is prepared by a Pechini method in the method, the Li[Ni1-x-yCoxMny]O2 is combined with the three-dimensional graphene through a high-energy ball milling method, and is finally coated on an aluminum foil after being mixed with an adhesive (CMC + SBS) and a conductive agent to prepare a positive electrode. The composite material prepared by the preparation method provided by the invention has the advantages of good cyclic performance and high specific capacity.

Description

technical field [0001] The invention belongs to the field of new energy, and in particular relates to a lithium-ion battery composite positive electrode material and a preparation method and application thereof. Background technique [0002] In recent years, with the rapid development of electronic information technology, the increasing popularity of portable electronic products such as notebook computers, mobile phones, and cameras, and the development of some military equipment, not only the miniaturization of chemical power sources, but also high specific energy and cycle life are required. Long, good storage performance, no pollution to the environment, etc. Lithium-ion batteries have high operating voltage (3.6V, three times that of cadmium-nickel and hydrogen-nickel batteries), small size (30% smaller than hydrogen-nickel batteries), and light weight (50% lighter than hydrogen-nickel batteries) , High specific energy (140Wh kg -1 , 2 to 3 times that of cadmium-nickel...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/583H01M4/62H01M10/0525H01G11/50
CPCH01G11/50H01M4/366H01M4/505H01M4/525H01M4/583H01M4/621H01M4/625H01M10/0525Y02E60/10
Inventor 王禹舟贺春华张海燕李运勇
Owner GUANGDONG UNIV OF TECH
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