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Lithium battery positive electrode material and preparation method thereof

A technology of cathode materials and cathode active materials, applied in the field of lithium battery cathode materials and its preparation, can solve problems such as cycle performance degradation, accelerated electrolyte decomposition, and unsuitability for large-scale production

Pending Publication Date: 2020-10-30
李爱军 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, ternary cathode materials, lithium cobalt oxide and lithium manganese oxide account for 90% of the market, but during the cycle, the high-priced cobalt, nickel, manganese, etc. in the cathode materials will react with the electrolyte to accelerate the decomposition of the electrolyte, thereby making the Decreased cycle performance
[0004] At present, many strategies are used to improve the cycle stability of lithium batteries, such as: oxide coating (Al 2 o 3 ,ZrO 2 ,CeO 2 , TiO 2 ), phosphate coating (AlPO 4 , YPO 4 , Li 3 PO 4 ), fluoride coating (AlF 3 ,NH 4 AlF 4 ), solid electrolyte coating (Li 1.4 Al 0.4 Ti 1.6 (PO 4 ) 3 , Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 , Li 3x La 2 / 3-x TiO 3 ), however, these coatings are synthesized by methods such as sol-gel method, spray coating or atomic layer deposition, which are not suitable for large-scale production

Method used

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  • Lithium battery positive electrode material and preparation method thereof
  • Lithium battery positive electrode material and preparation method thereof
  • Lithium battery positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Lithium cobalt oxide (LiCoO 2 ) and solid electrolyte Li 1.5 al 0.5 Ge 1.5 (PO 4 ) 3 Mix according to the mass ratio of 96.5%:3.5%, use isopropanol as the ball milling medium, the mass ratio of ball to material is 8:1, and ball mill at 750r / min for 2h. The resulting mixture was dried and then sintered at 650° C. for 4 h to obtain the positive electrode material.

[0032] figure 1 is the X-ray diffraction pattern of the cathode material. Prepared LiCoO 2 / Li 1.5 al 0.5 Ge 1.5 (PO 4 ) 3 The crystal form of the cathode material is good, and the original LiCoO 2 Compared to the lattice structure there is no change.

[0033] figure 2 is the scanning electron microscope image of the positive electrode material. Li 1.5 al 0.5 Ge 1.5 (PO 4 ) 3 Particle distribution in LiCoO 2 The surface of lithium cobalt oxide becomes rough after ball milling and sintering.

[0034] The positive electrode material, conductive carbon black, and binder polyvinylidene fluo...

Embodiment 2

[0038] Lithium cobalt oxide (LiCoO 2 ) and solid electrolyte Li 1.5 al 0.5 Ge 1.5 (PO 4 ) 3Mix according to the mass ratio of 97.5%:2.5%, use ethanol as the ball milling medium, the mass ratio of ball to material is 8:1, and ball mill at 750r / min for 2h. The resulting mixture was dried, and then sintered at 650° C. in air for 6 h to obtain a positive electrode material.

Embodiment 3

[0040] Lithium cobalt oxide (LiCoO 2 ) and solid electrolyte Li 7 La 3 Zr 2 o 12 Mix according to the mass ratio of 97.5%:2.5%, use isopropanol as the ball milling medium, the mass ratio of ball to material is 10:1, and ball mill at 1000r / min for 2h. The obtained mixture was dried, and then sintered at 650° C. for 4 h in the air to obtain the positive electrode material.

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Abstract

The invention belongs to the field of energy electrochemistry, and relates to a lithium battery positive electrode material and a preparation method thereof. The lithium battery positive electrode material of the invention is characterized in that the positive electrode material is a mixed material containing a positive electrode active material and a solid electrolyte, wherein the positive electrode active material is at least one of lithium manganate (LiMn2O4), lithium cobalt oxide (LiCoO2), a ternary positive electrode material (LiNi<1-x-y>CoxMnyO2 and LiNi<1-x-y>CoxAlyO2); the solid electrolyte is at least one of Li<1+x>AlxTi<2-x>(PO4)3, Li<1+x>AlxGe<2-x>(PO4)3, Li<7-x>La3Zr<2-x>TaxO12 and Li7La3Zr2O12. The lithium battery positive electrode material is prepared through ball milling, drying and sintering. The lithium battery positive electrode material is applied to the lithium battery, the cycle performance of the battery can be remarkably improved, and the lithium battery positive electrode material has a good application prospect.

Description

technical field [0001] The invention belongs to the field of energy electrochemistry, and relates to a lithium battery cathode material and a preparation method thereof. Background technique [0002] Since Sony commercialized the first lithium-ion battery in 1991, batteries have been widely used in portable electronics. With the increasing demand for electric vehicles and grid energy storage systems, it is imperative to develop batteries with higher energy density, longer cycle life, and affordable cost. However, in recent years, fire accidents of mobile phones, computers and electric vehicles have occurred continuously, and the safety of lithium batteries has become more and more important in practical applications. [0003] The commercial cathode materials on the market are mainly ternary cathode materials (LiNi 1-x-y co x mn y o 2 , LiNi 1-x- y co x al y o 2 ), lithium cobalt oxide (LiCoO 2 ), lithium manganate (LiMn 2 o 4 ) and lithium iron phosphate (LiFePO...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/62H01M10/052
CPCH01M4/362H01M4/485H01M4/505H01M4/525H01M4/62H01M10/052Y02E60/10
Inventor 李爱军黄杜斌
Owner 李爱军
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