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Method for improving rate capability of ternary cathode material of lithium ion battery

A lithium-ion battery and positive electrode material technology, applied in the field of new energy materials and energy storage devices, can solve the problems of material rate performance deterioration, cycle performance deterioration, specific capacity reduction, etc., achieve fast drying speed, improve rate performance, and cost low effect

Inactive Publication Date: 2017-06-13
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Nickel-cobalt-manganese ternary materials also have the problem of poor rate performance, because Ni 2+ ionic radius with Li + ionic radius The similarity can lead to the mixing of lithium and nickel, and the lithium that enters the nickel site is difficult to escape during the charge and discharge process, which leads to the deterioration of cycle performance and the decrease of specific capacity. This kind of mixing of lithium and nickel leads to the deterioration of the rate performance of the material

Method used

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  • Method for improving rate capability of ternary cathode material of lithium ion battery
  • Method for improving rate capability of ternary cathode material of lithium ion battery
  • Method for improving rate capability of ternary cathode material of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] a. Mix lithium carbonate, boron trioxide and lithium sulfate in a molar ratio of Li:B:S=1:2:0.1, add to deionized water, stir at a constant speed for 0.5h, and wait until the mixture is completely dissolved to obtain a coating solution;

[0023] b. LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 The ternary cathode material is LiNi according to the mass ratio 1 / 3 co 1 / 3 mn 1 / 3 o 2 : Li 2 O-2B 2 o 3 -mLi 2 SO 4 =100:5 mixing, slowly adding to the coating solution obtained in step a, maintaining a stirring speed of 100r / min, and stirring into a uniform slurry;

[0024] c. Spray-dry the slurry obtained in step b, control the inlet temperature to 220°C, and the outlet temperature to 110°C, and collect the dried powder;

[0025] d. Put the dried powder in step c into a muffle furnace for heat treatment at a temperature of 500° C., a heating rate of 5° C. / min, and a time of 10 hours to obtain a mixture;

[0026] e, the mixture obtained in step d is ground evenly, and 200 mesh sieves ...

Embodiment 2

[0028] a. Mix lithium carbonate, boric acid, and lithium sulfate in a molar ratio of Li:B:S=1:2:0.2, add to deionized water, stir at a constant speed for 0.5h, and wait until the mixture is completely dissolved to obtain a coating solution;

[0029] b. LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 The ternary cathode material is LiNi according to the mass ratio 1 / 3 co 1 / 3 mn 1 / 3 o 2 : Li 2 O-2B 2 o 3 -mLi 2 SO 4 = 100:3 mixing, slowly adding to the coating solution obtained in step a, maintaining a stirring speed of 150r / min, and stirring into a uniform slurry;

[0030] c. Spray-dry the slurry obtained in step b, control the inlet temperature to 220°C, and the outlet temperature to 110°C, and collect the dried powder;

[0031] d. Put the dried powder in step c into a muffle furnace for heat treatment at a temperature of 500° C., a heating rate of 5° C. / min, and a time of 10 hours to obtain a mixture;

[0032] e, the mixture obtained in step d is ground evenly, and 200 mesh sieves ar...

Embodiment 3

[0034] a. Mix lithium hydroxide, boric acid, and lithium sulfate in a molar ratio of Li:B:S=1:2:0.3, add to deionized water, stir at a constant speed for 1 hour, and wait until the mixture is completely dissolved to obtain a coating solution;

[0035] b. LiNi 0.5 co 0.2 mn 0.3 o 2 The ternary cathode material is LiNi according to the mass ratio 0.5 co 0.2 mn 0.3 o 2 : Li 2 O-2B 2 o 3 -mLi 2 SO 4 =100:1 mixing, slowly adding to the coating solution obtained in step a, maintaining a stirring speed of 200r / min, and stirring into a uniform slurry;

[0036] c. Spray-dry the slurry obtained in step b, control the inlet temperature to 220°C, and the outlet temperature to 110°C, and collect the dried powder;

[0037] d. Put the dried powder in step c into a muffle furnace for heat treatment at a temperature of 550° C., a heating rate of 5° C. / min, and a time of 10 hours to obtain a mixture;

[0038] e, the mixture obtained in step d is ground evenly, and 200 mesh sieves a...

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Abstract

The invention relates to a method for improving rate capability of a ternary cathode material of a lithium ion battery. According to the method, a spray drying technology is adopted to coat the ternary cathode material of the lithium ion battery with lithium fast ion conductor glass Li2O-2B2O3-mLi2SO4. A lithium compound, a boron compound and a lithium-sulfur compound in mole ratio are mixed with deionized water and uniformly stirred, paste is formed, a precursor is prepared through spray drying, placed in a muffle furnace and roasted at 500 DEG C for 10 h, and a sample is prepared. By means of the method, charge-discharge properties of the ternary cathode material of the lithium ion battery under high current density is improved, and the rate capability of the LiNixCoyMn(1-x-y)O2 ternary cathode material is improved. The treated ternary cathode material of the lithium ion battery can effectively improve the quick charge-discharge properties of a power battery. Meanwhile, the method adopts simple production equipment, production efficiency ishigh,cost islow, and large-scale production can be realized.

Description

technical field [0001] The invention belongs to the field of new energy materials and energy storage devices, and in particular relates to a method for improving the rate performance of a lithium-ion battery ternary cathode material. Background technique [0002] In the last two decades, because of its high energy density, long service life, high and low temperature resistance, and no memory effect, the application range of lithium-ion batteries has continued to expand. In addition to being used as power batteries for electric vehicles, civilian use from mobile phones , notebook computers, digital cameras, children’s toys and other small batteries to large-scale power batteries for grid peaking, solar and wind energy storage; military use covers sea (submarines, underwater robots), land (army soldier systems, machine warriors), Sky (unmanned aircraft), air (satellites, spaceships), etc. [0003] At present, the main research object of cathode materials for lithium-ion batte...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/485
CPCH01M4/04H01M4/485Y02E60/10
Inventor 王磊吕丁丁张琪炳程文华陈朝阳徐金宝任卫边亮常爱民
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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