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Lithium ion battery positive material and preparation method thereof

A technology for lithium-ion batteries and cathode materials, which is applied in battery electrodes, circuits, electrical components, etc., can solve the problems of complex process, unsuitable for industrial production, and difficulty in product collection.

Active Publication Date: 2011-06-08
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In these synthetic methods, there are respective advantages and disadvantages. For example, the solid-phase reaction process is simple, but the energy consumption is large, and the raw materials are not mixed uniformly; other soft chemical methods such as co-precipitation and sol-gel methods can make the mixing of raw materials Reach the atomic level, but the reaction process must strictly control the pH value, concentration, reaction temperature and other conditions of the solution, the process is very complicated
The combustion process is relatively simple, and can also ensure the uniform mixing of raw materials, but because a large amount of gas will be released during the reaction, it is difficult to collect the product
In summary, the current soft chemical methods are not suitable for industrial production

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment approach

[0007] The positive electrode material provided by the invention consists of: Li a mn b Fe c m d o 2 , where M is the rare earth elements scandium Sc, lanthanum La, praseodymium Pr, neodymium Nd, promethium Pm, samarium Sm, europium Eu, gadolinium Gd, terbium Tb, dysprosium Dy, holmium Ho, erbium Er, thulium Tm, ytterbium Yb, lutetium Lu One or more, and 1≤a≤1.5, 0<b≤1, 0<c≤1, 0<d≤0.1, and a+b+c+d=2.

[0008] The cathode material of the present invention has a layered rock salt structure.

[0009] The preparation method of the present invention comprises the following steps:

[0010] (1) Weigh Li source, Mn source, Fe source, rare earth ion doping source into the ball mill tank according to the ratio of 1-1.5:0-1:0-1:0-0.1, then add organic monomer and dispersant . Wherein the organic monomer and dispersant are added in an amount of 2-20wt% and 1-20wt% of the mass of Li source, Mn source, Fe source and rare earth ion doping source respectively;

[0011] (2) The above m...

Embodiment 1

[0031] By Mn(CH 3 COO) 2 4H 2 O, Fe 2 o 3 、LiCO 3 and Sm 2 (CO 3 ) 3 , Tb 2 (CO 3 ) 3 , Preparation of Li 1.1 mn 0.58 Fe 0.28 SM 0.01 Tb 0.01 o 2 .

[0032] Weigh the above five materials according to the stoichiometric ratio of the product and put them into a stainless steel ball mill tank (stainless steel balls), then add 2wt% acrylic acid, 1wt% polyvinyl alcohol and an appropriate amount of deionized water to the total mass of the materials, mix and ball mill for 12 hours, and take out the slurry Add the N-N-methylenebisacrylamide (MBAM) of monomer mass 2wt% while stirring, the hydrogen peroxide aqueous solution of 1wt%, 1wt% tetramethylethylenediamine (TEMED), continue to stir until the jelly-like After drying the gel in a drying oven at 60°C, treat it with microwave at high heat for 1 minute, keep the temperature in a muffle furnace at 600°C for 2 hours under an oxygen atmosphere, and cool it to room temperature with the furnace to obtain Li 1.1 mn 0.58...

Embodiment 2

[0035] By Mn(NO 3 ) 2 4H 2 O, Fe(NO 3 ) 2 9H 2 O, NdCl 3 , LiOH·H 2 O to prepare Li 1.2 mn 0.5 Fe 0.2 Nd 0.1 o 2 .

[0036] Weigh the above four materials according to the stoichiometric ratio of the product and put them into an agate ball mill jar (agate ball), then add acrylamide (AM) of 8wt% of the total mass of the material, polyethylene glycol (PEG) of 5wt% and an appropriate amount of deionized water, mixed and ball milled for 48 hours, took out the slurry, and added N-N-methylenebisacrylamide (MBAM) of monomer mass 4wt% while stirring, 2wt% ammonium persulfate solution, 2wt% tetramethylethylenediamine ( TEMED), continue to stir until a jelly-like gel is produced, put it in an 80°C drying oven for drying, treat it with medium heat in the microwave for 40 minutes, and keep the temperature in a muffle furnace at 700°C for 12 hours under an air atmosphere, and cool to room temperature with the furnace to obtain Li 1.2 mn 0.5 Fe 0.2 Nd 0.1 o 2 black powder. ...

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Abstract

The purpose of the invention is to provide a lithium ion battery positive material of high specific capacity, good multiplying power performance, good cycle performance, compatible high and low temperature performance and low technology cost, and a preparation method of the lithium ion battery positive material of high specific capacity. The molecule structural formula of the lithium ion battery positive material is LiaMnbFecMdO2, and the method comprises the preparing steps: (1) preparing slurry; (2) preparing gel; (3) drying the gel, and sintering. Compared with the prior art, the inventionhas significant advantages of high specific capacity, good multiplying power performance, good cycle performance, compatible high and low temperature performance(from -20 DEG C to +50 DEG C), simple process and low process cost.

Description

Technical field: [0001] The invention relates to a lithium ion battery material, in particular to a lithium ion battery cathode material and a preparation method thereof. Background technique: [0002] At present, the actual discharge capacity of commercial lithium-ion battery cathode materials is low, which cannot meet the needs of electric vehicles and hybrid electric vehicles. Lithium manganese oxide cathode materials are favored by researchers because of their rich resources and low cost, mainly divided into spinel LiMn 2 o 4 , layered LiMnO 2 and layered Li 2 MnO 3 . Spinel LiMn 2 o 4 The theoretical discharge capacity is 148mAh / g, but the actual discharge capacity is only about 120mAh / g. At the same time, its development is restricted to a certain extent due to the shortcomings of poor cycle stability and high temperature capacity fading. Layered LiMnO 2 The theoretical discharge capacity is 285mAh / g, and the actual capacity can reach 190mAh / g, but because the...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/1391
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 杨书廷尹艳红岳红云曹朝霞张会双
Owner HENAN NORMAL UNIV
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