Preparation method of polyelectrolyte-coated LiNi0.5Mn1.5O4 positive electrode material

A polyelectrolyte and positive electrode material technology, which is applied in the preparation of high-voltage positive electrode materials for lithium-ion batteries and the preparation of surface-coated spinel-type high-voltage lithium nickel manganese oxide positive electrode materials. It can solve the cumbersome process and high-temperature calcination and other problems, to achieve the effect of high rate, high specific capacity, and enhanced compatibility

Active Publication Date: 2014-06-25
四川兴能新材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method is cumbersome and requires high temperature calcination

Method used

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  • Preparation method of polyelectrolyte-coated LiNi0.5Mn1.5O4 positive electrode material
  • Preparation method of polyelectrolyte-coated LiNi0.5Mn1.5O4 positive electrode material
  • Preparation method of polyelectrolyte-coated LiNi0.5Mn1.5O4 positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh 10.2g of polyacrylic acid with an average molecular weight of 3000 into a 200ml evaporating dish, weigh LiOH·H 2 O 2.32g, dissolved in 36g of distilled water to obtain LiOH solution, the LiOH solution was added dropwise to the evaporating dish until the pH value of the solution was 8, the above-mentioned solution was initially steamed to a viscous shape at 80°C on the electric heating mantle, and then the mixture was Move to a vacuum oven and dry in vacuum at 100 °C for 24 h to obtain PAALi as a white solid. Weigh LiNi 0.5 mn 1.5 o 4 The finished product is 4.975 g, PAALi is 0.025 g, and the mass fraction of PAALi in the mixture is 0.5%. LiNi to be weighed 0.5 mn 1.5 o 4 , PAALi 0.025g was fully dissolved and mixed in 5mL of water, and after preliminary stirring and evaporation on the electric heating mantle, it was moved to a vacuum drying oven at 100°C for 24 hours to obtain 5g of LNM0.5%PAALi powder sample.

[0025] Weigh 0.1 g of Super P, 0.8 g of LNM0....

Embodiment 2

[0027] According to the method described in Example 1, PAALi was prepared. Weigh LiNi 0.5 mn 1.5 o 4 Finished product 4.8500 g, PAALi 0.150 g, the mass fraction of PAALi in this mixture is 3%. LiNi to be weighed 0.5 mn 1.5 o 4 , 0.150 g of PAALi was fully dissolved and mixed in 5 mL of water, and after preliminary stirring and evaporation on the electric heating mantle, it was moved to a vacuum drying oven at 100 ° C for 24 hours to obtain 5 g of LNM3% PAALi powder sample. Prepare and assemble the battery according to the method described in Example 1, and measure its discharge specific capacity at 0.2 C, 0.5 C, 1 C, 2 C, 6 C, 12C and 0.2C to be 118.5 mAh / g and 116.7 mAh / g respectively , 113.7 mAh / g, 110.6 mAh / g, 99.1 mAh / g, 84.6 mAh / g and 119.5 mAh / g; then it was measured at 1 C for 200 charge-discharge cycles, and the capacity retention rate was 88.9%.

Embodiment 3

[0029] According to the method described in Example 1, PAALi was prepared. Weigh LiNi 0.5 mn 1.5 o 4 Finished product 4.9500 g, PAALi 0.050 g, the mass fraction of PAALi in this mixture is 1%. LiNi to be weighed 0.5 mn 1.5 o 4 , 0.050 g of PAALi was fully dissolved and mixed in 5 mL of water, stirred and evaporated on the electric heating mantle, and then moved to a vacuum drying oven at 100 ° C for 24 hours to obtain 5 g of LNM1% PAALi powder sample. Prepare and assemble the battery according to the method described in Example 1, and measure its discharge specific capacity at 0.2 C, 0.5 C, 1 C, 2 C, 6 C, 12C and 0.2C to be 125.5 mAh / g and 121.5 mAh / g respectively , 117.3 mAh / g, 110.6 mAh / g, 96.3 mAh / g, 74.1 mAh / g and 122.7 mAh / g; then it was measured at 1 C for 200 charge-discharge cycles, and the capacity retention rate was 84.3%.

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Abstract

The invention discloses a preparation method of a polyelectrolyte-coated LiNi0.5Mn1.5O4 positive electrode material. The preparation method comprises the following steps: coating LiNi0.5Mn1.5O4 with a polyelectrolyte solution, and drying to obtain polyelectrolyte-coated LiNi0.5Mn1.5O4, wherein the polyelectrolyte is one or a mixture of several of lithium polyacrylate, lithium polymethylacrylate, lithium polymaleate, lithium poly(methyl vinyl ether maleic acid copolymer) and lithium polyfumarate. According to the coating method, a layer of polyelectrolyte membrane is formed on the surface of LiNi0.5Mn1.5O4, so that the compatibility with an electrolyte solution is improved. Therefore, the polyelectrolyte-coated LiNi0.5Mn1.5O4 positive electrode material has the characteristics of high specific capacity, high rate and long cycle life.

Description

technical field [0001] The invention relates to a preparation method of a high-voltage positive electrode material of a lithium-ion battery, in particular to a preparation method of a surface-coated spinel-type high-voltage lithium nickel manganese oxide positive electrode material, and belongs to the technical field of lithium-ion battery positive electrode materials. Background technique [0002] Cathode materials with a charge-discharge voltage platform greater than 4.5 V are generally referred to as high-voltage cathode materials. For example, LiNi 0.5 mn 1.5 o 4 , the operating voltage platform is 4.7 V, which is a typical 5 V high voltage cathode material. LiNi 0.5 mn 1.5 o 4 With three-dimensional lithium ion channel, 0.5mol Ni 2+ Replaced with 1mol LiMn 2 o 4 Medium Mn 3+ All become Mn 4+ (LiNi 0.5 mn 1.5 o 4 ) without affecting the theoretical specific capacity of the material. At the same time, due to LiNi 0.5 mn 1.5 o 4 Mn does not exist in 3+ ,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/505H01M4/525
CPCH01M4/1391H01M4/505H01M4/525H01M4/62H01M10/0525H01M2004/028Y02E60/10
Inventor 范未峰王国冬代洋杰姜忱吴宗峻
Owner 四川兴能新材料有限公司
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