Lithium ion battery positive electrode active material and preparation method thereof

A positive electrode active material and lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as electrolyte side reactions, capacity degradation, distortion, etc., to slow down impedance growth, suppress side reactions, and suppress growth thick effect

Inactive Publication Date: 2017-11-10
SHANDONG YUHUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Ternary materials, due to their high specific capacity, meet the increasing pursuit of energy density in power batteries for new energy vehicles. There is a phenomenon of capacity degradation, and the cycle life needs to be further improved
However, the traditional doping method causes the doped elements to be uniformly distributed in the ternary material particles, and lacks distribution optimization for the local area of ​​the particles

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Put 20L of 0.2-2mol / L dilute ammonia water into the 100L reactor as the bottom liquid, perform mechanical stirring at a speed of 400 rpm, and pass in nitrogen for atmosphere protection. Dissolve 288g of molybdenum oxide in 5L of 7mol / L excess ammonia solution, prepare 0.4mol / L ammonium orthomolybdate solution as the second complexing agent solution, and put it into storage tank A. Provide 5L of 5-10mol / L ammonia solution as the first complexing agent solution, and put it into storage tank B. The liquid storage tank A is added to the liquid storage tank B at a flow rate of 0.25L / h, and the liquid storage tank B is kept stirring at 150 rpm and continuously added to the reaction kettle at a flow rate of 0.5L / h. At this time, the tank B flows out The solution is a gradient concentration solution of Mo element. From 0h to 20h in the effluent of tank B, the Mo concentration will gradually increase from 0mol / L to 0.4mol / L. In addition, 2mol / L Ni was continuously added to the...

Embodiment 2

[0029] Put 25L of 0.2-2mol / L dilute ammonia water into the 100L reactor as the bottom liquid, perform mechanical stirring at a speed of 600 rpm, and pass in argon gas for atmosphere protection. Dissolve 230g of molybdenum oxide in 5L of 5mol / L excess ammonia solution, prepare 0.32mol / L ammonium orthomolybdate solution as the second complexing agent solution, and put it into storage tank A. Provide 5L of 5-10mol / L ammonia solution as the first complexing agent solution, and put it into storage tank B. The liquid storage tank A is added to the liquid storage tank B at a flow rate of 0.25L / h, and the liquid storage tank B is kept stirring at 50 rpm and continuously added to the reaction kettle at a flow rate of 0.5L / h. At this time, the tank B flows out The solution is a gradient concentration solution of Mo element. From 0h to 20h in the effluent of tank B, the Mo concentration will gradually increase from 0mol / L to 0.32mol / L. In addition, 2mol / L Ni was continuously added to t...

Embodiment 3

[0033] Put 10L of 0.2-2mol / L dilute ammonia water into the 100L reactor as the bottom liquid, perform mechanical stirring at a speed of 500 rpm, and pass in nitrogen for atmosphere protection. Dissolve 230g of molybdenum oxide in 5L of 6mol / L excess ammonia solution, prepare 0.32mol / L ammonium orthomolybdate solution as the second complexing agent solution, and put it into storage tank A. Provide 5L of 5-10mol / L ammonia solution as the first complexing agent solution, and put it into storage tank B. The liquid storage tank A is added to the liquid storage tank B at a flow rate of 0.25L / h, and the liquid storage tank B is kept stirring at 100 rpm and continuously added to the reaction kettle at a flow rate of 0.5L / h. At this time, the tank B flows out The solution is a gradient concentration solution of Mo element. From 0h to 20h in the effluent of tank B, the Mo concentration will gradually increase from 0mol / L to 0.32mol / L. In addition, 2mol / L Ni was continuously added to t...

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Abstract

The invention relates to the technical field of a lithium ion battery material, and particularly discloses a lithium ion battery positive electrode active material and a preparation method thereof. The lithium ion battery positive electrode active material is characterized in that the average constituent is Li<1+a>Ni<x>Co<1-x-y>Mn<y>MoO2, wherein 0.01<=a<=0.1, 0.6<=x<=0.9, 0.1<=y<=0.2, 0.1<=(x+y)<=0.2, and 0.005<=b<=0.03; and in particle of the positive active material, the concentration of Mo element is continuously and gradiently changed from inside to surface of the particle, and the Mo concentration is gradiently raised from a body phase to surface of the particle. By doping the Mo element into a ternary material in gradient distribution mode, the Mo element in the Li<1+a>Ni<x>Co<1-x-y>Mn<y>MoO2 particle is promoted to be gradiently raised from the body phase to the surface, and the bonding effect between a transition metal element and an oxygen atom is enhanced.

Description

(1) Technical field [0001] The invention relates to the technical field of lithium-ion battery materials, in particular to a lithium-ion battery cathode active material and a preparation method thereof. (2) Background technology [0002] Lithium-ion batteries have the advantages of high working voltage, high specific energy, long cycle life, low self-discharge rate, and no memory effect. They are widely used in portable electronic devices, electric vehicles, large-scale power supplies, and energy storage fields. Lithium-ion battery cathode material, currently commercialized lithium cobalt oxide LiCoO 2 , spinel lithium manganese oxide LiMn 2 o 4 , lithium iron phosphate LiFePO 4 and the ternary material Li 1+a Ni x co 1-x-y mn y o 2 Wait. Among them, LiCoO 2 Due to the scarcity of Co resources, the price is expensive, and LiCoO 2 Other defects of itself have restricted the application in the field of power batteries. LiMn 2 o 4 Although the resources are abunda...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/485H01M4/62H01M10/0525
CPCH01M4/362H01M4/485H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 张会斌赵洪东牛龙伟于文倩王瑛赵成龙
Owner SHANDONG YUHUANG NEW ENERGY TECH
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