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Cathode material for fast lithium ion conductor phase-modified lithium ion battery and preparation method thereof

A lithium-ion battery, lithium fast-ion technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor material cycle life, poor rate performance, rapid capacity decay, etc., to achieve high and low temperature performance compatibility, discharge ratio The effect of high capacity and improved electrical conductivity

Inactive Publication Date: 2012-10-31
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, due to its low conductivity, the material has poor cycle life, fast capacity decay, and poor rate performance, so it cannot be used in batteries, especially power batteries.

Method used

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  • Cathode material for fast lithium ion conductor phase-modified lithium ion battery and preparation method thereof
  • Cathode material for fast lithium ion conductor phase-modified lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The composition of the rare earth element doped composite layered lithium ion battery positive electrode material modified according to the obtained lithium fast ion conductor phase is 0.98Li 2 MnO 3 ?0.02LiV 0.98 SM 0.01 Yb 0.01 o 2 0.1 La 0.57 Li 0.3 TiO 3 The stoichiometric ratio of the raw materials is weighed, and all the raw materials are added to the agate ball mill (agate ball) and mixed evenly, then a polyacrylamide (PAM) solution with a mass concentration of 10% is added, wherein the molecular weight of PAM is 6 million, polypropylene The mass of the amide solution accounts for 15% of the total mass of the raw materials. Add water and ball mill for 0.5 hours to obtain a paste slurry; after being fully dried in an air atmosphere at a temperature of 80°C, pulverize it, and then program the temperature to 950°C in an air atmosphere , keep warm for 5 hours, and after cooling down with the furnace, the target product lithium fast ion conductor phase-modified...

Embodiment 2

[0037] According to the composition of the positive electrode material of the rare earth element doped composite layered lithium ion battery is 0.1Li 2 TiO 3 ?0.9LiMn 0.6 Fe 0.29 co 0.1 Nd 0.01 o 2 The stoichiometric ratio and lithium fast ion conductor composition is La 0.475 Li 0.475 Sr 0.05 TiO 3 Weigh the raw materials separately, then add the raw materials into the polyurethane ball mill tank (zirconia ball) and mix evenly, then add the polyacrylamide (PAM) solution with a mass concentration of 10%, wherein the molecular weight of PAM is 2 million , the quality of the polyacrylamide solution accounts for 20% of the total mass of the raw materials, add water and ball mill for 4 hours to obtain a paste slurry; after the air atmosphere is fully dried at a temperature of 150 ° C, it is pulverized, and the temperature is programmed to rise to 900 ° C under an air atmosphere , heat preservation for 8 hours, after cooling down with the furnace, the required rare earth e...

Embodiment 3

[0039] According to the rare earth element doping composite layered lithium ion battery positive electrode material 0.4Li 2 MnO 3 ?0.6LiNi 0.5 Cr 0.3 La 0.1 Ce 0.1 o 2 The stoichiometric ratio of the raw materials is weighed, and the raw materials are added to a stainless steel ball mill (stainless steel ball) and mixed evenly, and then a polyacrylamide (PAM) solution with a mass concentration of 10% is added. Among them, the molecular weight of PAM is 20 million, and polyacrylamide The quality of the solution accounts for 2% of the total mass of the raw materials weighed, and after adding water and ball milling for 6 hours, a paste slurry is obtained; after being fully dried under an air atmosphere at a temperature of 100 ° C, it is pulverized, and the temperature is programmed to rise to 800 ° C under an oxygen-enriched atmosphere. After heat preservation for 10 h and quenching, the required rare earth element doped composite layered lithium ion battery positive electro...

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Abstract

The invention discloses a cathode material for a fast lithium ion conductor phase-modified lithium ion battery and a preparation method thereof. The key points of the technical scheme are as follows: the cathode material for the fast lithium ion conductor phase-modified lithium ion battery is a composite material consisting of a rare-earth element doped composite layered lithium ion battery cathode material xLi2MO3 (1-x) LiN(1-y)RyO2 (M is Mn, Ti or Sn, N is Mn, Ni, Co, Fe, Cr, V or Mo, R is one or more than one of Sc, Y, Pr, Nd, La, Ce, Sm, Yb, Eu and Gd, x is larger than 0 and smaller than 1, and y is larger than 0 and smaller than 0.2) and a fast lithium ion conductor, wherein the molar ratio of the fast lithium ion conductor to the rare-earth element doped composite layered lithium ion battery cathode material is n:1, and n is larger than 0 and smaller than or equal to 0.15. The invention also discloses a preparation method of the cathode material for the fast lithium ion conductor phase-modified lithium ion battery. The cathode material for a fast lithium ion conductor phase-modified lithium ion battery has the advantages of high specific capacity, good rate capacity, stability in recycling and strong temperature adaptation.

Description

technical field [0001] The invention relates to a lithium ion battery positive electrode material, in particular to a rare earth element doped composite layered lithium ion battery positive electrode material with lithium fast ion conductor phase modification and a preparation method thereof. Background technique [0002] The development of electric vehicles and power batteries has put forward higher requirements for lithium-ion battery cathode materials: such as high energy density, high safety, good rate performance, and wide temperature range. Currently commonly used cathode materials, such as lithium cobalt oxide (LiCoO 2 ), lithium manganate (LiMn 2 o 4 ), ternary system (LiMn 1 / 3 co 1 / 3 Ni 1 / 3 o 2 ), lithium iron phosphate (LiFePO 4 ) etc. cannot fully meet the needs of power batteries. Lithium cobalt oxide material has relatively high specific capacity, good cycle and low temperature performance, but high price and poor safety; lithium manganate material has l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/48
CPCY02E60/12Y02E60/10
Inventor 尹艳红岳红云曹朝霞张会双杨书廷
Owner HENAN NORMAL UNIV
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