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Lithium-ion battery cathode material li(ni 0.8 co 0.1 mn 0.1 ) 1-x the y x o 2 and preparation method

A lithium-ion battery, 1-xyxo2 technology, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve problems such as poor safety performance and poor electrochemical cycle performance

Active Publication Date: 2021-04-30
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to aim at lithium-ion battery cathode material layered high-nickel-nickel-cobalt lithium manganate (LiNi 0.8 mn 0.1 co 0.1 o 2 ) The shortcomings of poor electrochemical cycle performance and poor safety performance provide a lithium-ion battery cathode material Li(Ni 0.8 co 0.1 mn 0.1 ) 1-x Y x o 2 and its preparation method, wherein 0

Method used

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  • Lithium-ion battery cathode material li(ni <sub>0.8</sub> co <sub>0.1</sub> mn <sub>0.1</sub> ) <sub>1-x</sub> the y <sub>x</sub> o <sub>2</sub> and preparation method
  • Lithium-ion battery cathode material li(ni <sub>0.8</sub> co <sub>0.1</sub> mn <sub>0.1</sub> ) <sub>1-x</sub> the y <sub>x</sub> o <sub>2</sub> and preparation method
  • Lithium-ion battery cathode material li(ni <sub>0.8</sub> co <sub>0.1</sub> mn <sub>0.1</sub> ) <sub>1-x</sub> the y <sub>x</sub> o <sub>2</sub> and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031]When the amount of lithium is 10%, 0.02 (ie x = 0.02), respectively, according to the yttrium, and 1.1656 g LiOH · h2O, dissolve in 10 ml of deionized water, add 0.0565G Y2O3Uniform grinding, then add 2.2852 g of precursor and absolute ethanol, ground until the flow-norm mixed slurry is obtained, and then continue to ground under infrared lamp to completely become a mixed powder; then put it in an oven and ground into fine powder. Finally, the fine powder was placed in a tubular furnace under an oxygen atmosphere (oxygen flow rate 400 ml / min) at a rate of 3 ° C / min to warm up to 470 ° C, and then warmed to 780 ° C in a speed of 2 ° C / min. 15h,, then cool down to 450 ~ 500 ° C in 2 ° C / min, finally graining the product after cooling to room temperature, i.e., LI (Ni0.8CO0.1Mn0.1)0.98Y0.02O2.

[0032]Preparative lithium ion battery positive material Li (Ni0.8CO0.1Mn0.1)0.98Y0.02O2Perform constant current charge and discharge test, the test results areFigure 2 ~ 7As shown, f...

Embodiment 2

[0035]When the amount of lithium is 5%, 0.02 (i.e., x = 0.02), respectively, 1.1126 g LiOH · h2O, dissolve in 10 ml of deionized water, add 0.0565G Y2O3Uniform grinding, then add 2.2852 g of precursor and anhydrous ethanol, grind until the flow-norm mixed slurry is obtained, and then continuously grinding under the infrared lamp to completely become a mixed powder; then put it in the oven and grind, finally It was raised to the oxygen atmosphere (oxygen flow rate 400 ml / min) at a rate of 3 ° C / min at a speed of 470 ° C for 6 h, and then heated to 780 ° C for 15 h at a rate of 2 ° C / min. Then the 2 ° C / min program is lowered to 450 ~ 500 ° C, and finally the product is ground after cooling to room temperature, i.e., Li (Ni)0.8CO0.1Mn0.1)0.98Y0.02O2.

[0036]Preparative lithium ion battery positive material Li (Ni0.8CO0.1Mn0.1)0.98Y0.02O2Perform constant current charge and discharge test, from the test results, it can be seen that the positive electrode material still has high di...

Embodiment 3

[0039]When the amount of lithium is 10%, 0.01 (i.e., x = 0.01), respectively, according to the 1.1656 g of LiOH · h2O, dissolve in 10ml deionized water, add 0.0283G Y2O3Even with a grinding, 2.2509 g of precursor and anhydrous ethanol were added, grinded until the flow-norm mixed slurry was obtained, and then polished under infrared lamp to completely become a mixed powder; then put it in the oven and grinded, and finally It was raised to the oxygen atmosphere (oxygen flow rate 400 ml / min) at a rate of 3 ° C / min at a speed of 470 ° C for 6 h, and then heated to 780 ° C for 15 h at a rate of 2 ° C / min. Then the 2 ° C / min program is lowered to 450 ~ 500 ° C, and finally the product is ground after cooling to room temperature, i.e., Li (Ni)0.8CO0.1Mn0.1)0.99Y0.01O2.

[0040]Preparative lithium ion battery positive material Li (Ni0.8CO0.1Mn0.1)0.99Y0.01O2Perform constant current charge and discharge test, from the test results, it can be seen that the positive electrode material st...

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Abstract

The invention belongs to the field of lithium ion battery, providing li (NI 0.8 CO 0.1 Mn 0.1 Cure 1‑x Y x O 2 And its preparation method, of which 0 <x ≤0.05 is used to overcome Lini 0.8 Mn 0.1 CO 0.1 O 2 The disadvantages of poor electrochemical cycle performance and poor safety performance. The present invention uses the body phase mixing and modified, and the cation of cationic is reduced by a small amount of ionic elements through a very small amount of ionic elements, which expands Li + The diffusion channel, improve the li in the material + The diffusion capacity stabilizes the internal structure of the material, and significantly improves the circulation stability of the material; and the use of metal ions has the function of storage of oxygen. When the material is lithium -lithium under high voltage, NI 4+ Ion has extremely high oxidation activity, and ions have absorption o 2‑ The function can make Ni 4+ Plected the surface of the ion surface, which weakened the oxidation of the electrolyte, which improved the safety of discharge under high voltage. At the same time, the liyo generated on the surface 2 The lithium fast ion conductor not only enhances the ionic conductivity, but also reduces the surface of the material. That is, the positive electrode material of the invention lithium -ion battery can meet the demand for a large magnification and the demand for high energy density, and greatly improves the safety of its high voltage charging and discharge conditions.

Description

Technical field[0001]The present invention belongs to the field of lithium ion battery, which relates to a lithium ion battery positive electrode material and a preparation method thereof, and is specifically a lithium ion battery positive material Li (Ni0.8CO0.1Mn0.1)1-xYxO2And the preparation method, where 0<x ≤ 0.05.Background technique[0002]Under the promotion of new energy materials research and development, the positive electrode material of lithium-ion battery is moving toward higher energy density, volume ratio energy, cycle life, safety, and lower cost. The currently industrialized positive material in a wide variety of positive electrode materials: lithium cobaltate, lithium iron phosphate, lithium manganese acid, and a three-dimensional material; wherein the ternary material can be divided into nickel-cobalt manganese in accordance with the chemical composition. Two categories of cobalt aluminum. High nickel nickel-wateng manganese ternary positive electrode material d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/626H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 刘兴泉张美玲胡友作谭铭刘珊珊舒小会冉琪文李浩
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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