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Chlorine-doped modified lithium ion battery lithium-rich cathode material and preparation method thereof

A lithium-rich positive electrode material, lithium-ion battery technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of rapid decline in specific capacity and poor rate performance, and achieve excellent cycle stability, excellent rate performance, and discharge ratio The effect of high capacity

Active Publication Date: 2014-07-23
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of rapid decline in initial specific capacity and poor rate performance of existing lithium-rich positive electrode materials, and to provide a lithium-rich positive electrode material for high-capacity lithium-ion batteries and a preparation method thereof

Method used

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  • Chlorine-doped modified lithium ion battery lithium-rich cathode material and preparation method thereof
  • Chlorine-doped modified lithium ion battery lithium-rich cathode material and preparation method thereof
  • Chlorine-doped modified lithium ion battery lithium-rich cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Press LiNO 3 , Ni(NO 3 ) 2 , Mn(CH 3 COO) 2 , Co(NO 3 ) 2 , LiCl, and citric acid with a molar ratio of 1.21︰0.155︰0.515︰0.13︰0.05︰0.8 were weighed, ground in a mortar and mixed evenly, then added 5 mL of deionized water, and continued to grind until the mixture was uniform and fine mushy. Then bake the mixture at 120°C for 12 hours to obtain a precursor. The precursor is pre-calcined at 500°C for 6 hours, then cooled and ground, then calcined at 850°C for 20 hours and then cooled to obtain Li[Li 0.2 Ni 0.155 co 0.13 mn 0.515 ]O 1.95 Cl 0.05 Cathode material.

[0025] Press LiNO 3 , Ni(NO 3 ) 2 , Mn(CH 3 COO) 2 , Co(NO 3 ) 2 , The molar ratio of citric acid is 1.26:0.13:0.54:0.13:0.8 by weighing, and then the same steps as above can be used to synthesize Li 1.2 mn 0.54 Ni 0.13 co 0.13 o 2 .

Embodiment 2

[0027] Press LiNO 3 , Ni(NO 3 ) 2 , Mn(CH 3 COO) 2 , Co(NO 3 ) 2 , LiCl, and citric acid with a molar ratio of 1.23︰0.145︰0.525︰0.13︰0.03︰0.8 were weighed, ground in a mortar and mixed evenly, then added 5 mL of deionized water, and continued to grind until the mixture was uniform and fine mushy. Then bake the mixture at 120°C for 12 hours to obtain a precursor. The precursor is pre-calcined at 500°C for 6 hours, then cooled and ground, then calcined at 850°C for 20 hours and then cooled to obtain Li[Li 0.2 Ni 0.145 co 0.13 mn 0.525 ]O 1.97 Cl 0.03 Cathode material.

Embodiment 3

[0029] Press LiNO 3 , Ni(NO 3 ) 2 , Mn(CH 3 COO) 2 , Co(CH 3 COO) 2 , LiCl, and citric acid with a molar ratio of 1.16︰0.18︰0.49︰0.13︰0.1︰0.8 were weighed, ground in a mortar and mixed evenly, then added 5 mL of deionized water, and continued to grind until the mixture was uniform and fine mushy. Then bake the mixture at 120°C for 12 hours to obtain a precursor. The precursor is pre-calcined at 550°C for 5 hours, cooled and ground, then calcined at 850°C for 20 hours and then cooled to obtain Li[Li 0.2 Ni 0.18 co 0.13 mn 0.49 ]O 1.9 Cl 0.1 Cathode material.

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Abstract

The invention relates to a chlorine-doped modified lithium ion battery lithium-rich cathode material and a preparation method thereof and belongs to the field of lithium ion batteries. The cathode material is Li[Li0.2Ni(0.2-0.5b+0.5a)CobMn(0.6-0.5b-0.5a)]O(2-a)Cl(a), wherein a is more than 0 and not more than 0.1, and b is not less than 0 and not more than 0.13; and lithium salt, nickel salt, manganese salt, cobalt salt, lithium chloride and a combustion improver are ground into fine powder, a solvent is added and then uniformly mixed, and the lithium ion battery lithium-rich cathode material is obtained by firing. The lithium ion battery lithium-rich cathode material is high in discharge specific capacity, high in cycle stability, high in magnification performance and compatible in high-temperature performance and low-temperature performance, and can meet requirements of a power battery. The chloride salt for doping is rich in source, low in cost, environment-friendly, simple and practicable in synthesis process, low in manufacturing cost, convenient for large-scale industrial production and high in practicability.

Description

technical field [0001] The invention relates to a preparation method of a lithium-rich cathode material of a lithium-ion battery modified by doping with chlorine, and belongs to the field of lithium-ion batteries. Background technique [0002] As a secondary green battery, lithium-ion batteries have been widely used in many fields such as portable electronic devices, and have begun to expand the market for large-capacity batteries such as electric vehicles. The current mainstream cathode material used in lithium-ion secondary batteries is still LiCoO 2 , but LiCoO 2 Low capacity utilization, high cost, and serious environmental pollution force people to seek its substitutes. In recent years, lithium-rich cathode materials Li[Li x Ni y mn z co 1-x-y-z ]O 2 Because of its advantages of relatively high capacity and low price, it has become a research hotspot. [0003] Li[Li x Ni y mn z co 1-x-y-z ]O 2 Mainly by Li 2 MnO 3 with layered material LiMO 2 (M=Ni, Mn, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/48
CPCY02E60/10
Inventor 张海朗叶艳艳
Owner JIANGNAN UNIV
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