Lithium-ion battery ternary material coated with metal oxide on surface and preparation method thereof

A lithium-ion battery and surface coating technology, applied in the field of lithium-ion batteries, can solve the problems of electrolyte reaction, voltage platform reduction, difficulty in ensuring uniformity of precipitation, etc., and achieve the effect of uniform coating and simple method

Active Publication Date: 2017-05-17
SHANGHAI INST OF SPACE POWER SOURCES
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although lithium-rich manganese-based cathode materials have high discharge specific capacity, there are still many problems in practical applications of this type of material: (1) the first Coulombic efficiency is low; (2) the structural stability is poor; (3) the discharge voltage The platform gradually decreases; (4) Serious reaction with electrolyte under high voltage
[0006] At present, there are many reports on the coating modification methods of ternary cathode materials for lithium-ion batteries. Among various surface coating materials, metal oxides are a relatively common surface modification material with relatively simple coating methods. However, the current coating method is difficult to ensure the uniformity of the precipitation, and the particles are large, resulting in uneven surface coating, resulting in unstable capacity of the positive electrode material

Method used

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  • Lithium-ion battery ternary material coated with metal oxide on surface and preparation method thereof
  • Lithium-ion battery ternary material coated with metal oxide on surface and preparation method thereof
  • Lithium-ion battery ternary material coated with metal oxide on surface and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Step 1, weigh the percentage by weight to be 0.5% (that is, 0.5% wt ) of polyacrylamide aqueous solution 5L as a dispersant solution. 36.84g of Al(NO 3 ) 3 9H 2 O was added to the above-mentioned dissolved dispersant solution to fully disperse evenly. Step 2, the cathode material Li[Li 0.2 mn 0.54 Ni 0.13 co 0.13 ]O 2 Add to the solution obtained in step 1 and stir for 3 hours. Step 3, adding potassium hydroxide solution, adjusting the pH value of the solution in step 2 to between 9-10, then filtering, drying the obtained solid at 120°C to obtain a positive electrode material coated with aluminum hydroxide; step 4, adding The positive electrode material coated with aluminum hydroxide was heated at 450°C for 2 hours to convert the hydroxide into an oxide, and finally a positive electrode material sample coated with aluminum oxide was obtained.

[0038] The Li[Li obtained by this embodiment 0.2 mn 0.54 Ni 0.13 co 0.13 ]O 2 Scanning electron microscope (SEM...

Embodiment 2

[0043] Step 1, weigh the percentage by weight to be 0.25% (i.e. 0.25% wt ) of polyacrylamide aqueous solution 6L as a dispersant solution. 36.84g of Al(NO 3 ) 3 9H 2 O was added to the above-mentioned dissolved dispersant solution to fully disperse evenly. Step 2, the cathode material Li[Li 0.2 mn 0.54 Ni 0.13 co 0.13 ]O 2 Add to the solution obtained in step 1 and stir for 3 hours. Step 3, adding potassium hydroxide solution, adjusting the pH value of the solution to 8, then filtering, and drying the obtained solid at 120° C. to obtain a positive electrode material coated with aluminum hydroxide. Step 4: heat-treat the positive electrode material coated with aluminum hydroxide at a temperature of 550° C. for 2 hours to convert the hydroxide into an oxide, and finally obtain a positive electrode material sample coated with aluminum oxide on the surface.

Embodiment 3

[0045] Step 1, weigh the percentage by weight to be 0.5% (that is, 0.5% wt ) of polyacrylamide aqueous solution 5L as a dispersant solution. 55.26g of Al(NO 3 ) 3 9H 2 O was added to the above-mentioned dissolved dispersant solution to fully disperse evenly. Step 2, the cathode material Li[Li 0.2 mn 0.54 Ni 0.13 co 0.13 ]O 2 Add to the solution obtained in step 1 and stir for 6 hours. Step 3, adding potassium hydroxide solution, adjusting the pH value of the solution to 8.5, then filtering, and drying the obtained solid at 120° C. to obtain a positive electrode material coated with aluminum hydroxide. Step 4: heat-treat the positive electrode material coated with aluminum hydroxide at a temperature of 450°C for 3 hours to convert the hydroxide into an oxide, and finally obtain a positive electrode material sample coated with aluminum oxide on the surface.

[0046] The material cycle performance curve before and after coating is as follows: Figure 5 As shown, charg...

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Abstract

The invention discloses a ternary cathode material coated with metal oxide on the surface and used for a lithium ion battery, and a preparation method for the ternary cathode material. The preparation method comprises the following steps: step 1, adding soluble metal salt to a dispersant solution to enable the salt to be sufficiently dispersed evenly; step 2, adding a cathode material in a solution obtained in the step 1 for stirring for 1-5 h; step 3, adding an aqueous solution of an alkali metal hydroxide to a solution obtained in the step 2, adjusting the pH value of the solution to be 7-12, and carrying out filtering and drying to obtain a cathode material coated with metal oxide on the surface; step 4, performing heat treatment on the cathode material coated with metal oxide on the surface at the temperature of 400-700 DEG C to obtain the ternary cathode material coated with metal oxide on the surface. According to the preparation method for the ternary cathode material coated with metal oxide on the surface and used for the lithium ion battery, the method is simple, polyacrylamide is introduced as a dispersing agent and a flocculating agent, so that uniform coating of the ternary cathode material is realized, industrial production is facilitated, and the performance of the modified ternary cathode material is greatly improved.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to a ternary positive electrode material for a lithium ion battery, in particular to a ternary positive electrode material for a lithium ion battery with a surface coated metal oxide and a preparation method thereof. [0002] technical background [0003] my country has put forward an energy requirement of 230 Wh / kg in 2015 for aerospace power applications. In addition, my country and Japan have formulated specific energy requirements higher than 200 Wh / kg in 2020 for power batteries for new energy electric vehicles. Target. To achieve these battery indicators, the development of cathode materials with specific capacity indicators higher than 220 mAh / g has become a top priority. Among the existing cathode materials, layered structure cathode materials are still the mainstream. The first generation layered material LiCoO 2 LiNiO has good electrochemical stability and excellent cyc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/62
CPCB82Y30/00H01M4/366H01M4/505H01M4/525H01M4/62H01M10/0525Y02E60/10
Inventor 贾荻俞超孙毅王梦微汤卫平郑奕
Owner SHANGHAI INST OF SPACE POWER SOURCES
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