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Preparation method of limn2o4 cathode material with porous sheet structure

A cathode material and sheet-like structure technology, applied in the field of preparation of cathode materials for lithium-ion batteries, can solve problems such as difficulty in large-scale industrial mass production, untested electrochemical properties of nanosheets, cumbersome preparation process, etc., and achieve high specific capacity And the effects of cycle stability, low price, and simple preparation method

Active Publication Date: 2018-04-24
LUOYANG INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation process of this electrode material is cumbersome and time-consuming, and it is necessary to prepare MnO 2 Nanosheets and use them as templates to prepare LiMn 2 o 4 Nanosheets
In the preparation process, expensive and toxic organic reagents and raw materials are used, such as ether, block copolymer, methyl lithium, etc., making it difficult to achieve large-scale industrial mass production
At the same time, the prepared LiMn 2 o 4 The electrochemical performance of nanosheets at higher magnification (>30C) was not examined

Method used

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  • Preparation method of limn2o4 cathode material with porous sheet structure
  • Preparation method of limn2o4 cathode material with porous sheet structure
  • Preparation method of limn2o4 cathode material with porous sheet structure

Examples

Experimental program
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Effect test

Embodiment 1

[0031] 1) Accurately weigh 0.362g LiNO 3 and 2.451g Mn(CH 3 COO) 2 4H 2 O is added to 30mL of 50% ethanol solution by mass percentage, and the molar concentration of divalent manganese salt is 0.333mol L -1 , stir evenly, after it dissolves completely, add 2.2g resorcinol and 3.0mL formaldehyde solution (the mass fraction of formaldehyde solution is 36.5%), stir to make it dissolve completely;

[0032] 2) Transfer the solution obtained in step 1) to the reactor, and immerse the polymer film Celgard 2400 with a microporous structure into the solution in the reactor, place it in a blast drying oven after sealing, and dry it at 85 Reaction at ℃ for 48 hours;

[0033] 3) After the reaction is over, take out the reactor, and after the reactor is cooled to room temperature, put LiMn in the reactor 2 o 4 The high molecular polymer film of the precursor is taken out from the reaction kettle, and then the high molecular polymer film is placed in a blast drying oven, and dried at ...

Embodiment 2

[0038] The steps are the same as those in Example 1, except that the mass percentage of the ethanol solution in step 1) is 15%. According to the test method described in Example 1, the constant current charge and discharge performance test was carried out, and the first discharge capacity at 0.5C rate was 129.5mAh g -1 , the discharge capacity after 50 cycles is 119.7mAh g -1 , The specific capacity retention rate is 92.4%.

Embodiment 3

[0040] Step is identical with the step in embodiment 1, difference is that the molar concentration of the divalent manganese salt in step 1) is 0.8mol L -1 . According to the test method described in Example 1, the constant current charge and discharge performance test was carried out, and the first discharge capacity was 130.5mAh g at a rate of 0.5C. -1 , the discharge capacity after 50 cycles is 118.2mAh g -1 , The specific capacity retention rate is 90.6%.

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Abstract

The invention relates to a preparation method of LiMn2O4 cathode material with a porous sheet structure. Add soluble lithium salt and divalent manganese salt into ethanol solution, then add resorcinol and formaldehyde in sequence, and transfer to reaction after completely dissolving Add a polymer film with a microporous structure to the kettle for reaction; after the reaction, cool to room temperature, take out the polymer film filled with the precursor of the LiMn2O4 positive electrode material, dry and sinter at high temperature. The invention can ensure the uniform mixing of raw materials at the molecular level, which is beneficial to reduce the synthesis reaction temperature and the generation probability of impurity phases. The obtained LiMn2O4 positive electrode material has a two-dimensional sheet and porous structure, which can improve the migration rate of lithium ions and improve the electrode material. The contact area with the electrolyte increases the number of active sites, reduces the charge transfer resistance, has high specific capacity and cycle stability, and is suitable for high rate charge and discharge requirements.

Description

technical field [0001] The invention belongs to the technical field of preparation of lithium ion battery cathode materials, in particular to a LiMn with a porous sheet structure 2 o 4 Preparation method of cathode material. Background technique [0002] Lithium-ion batteries have many advantages such as high specific energy density, environmental friendliness, long cycle life, and no memory effect. They have become the fastest-growing secondary batteries after nickel-cadmium and nickel-metal hydride batteries and have successfully achieved commercial production. After more than 20 years of popularization, lithium-ion batteries as the only power supply system have been widely used in smartphones, notebook computers, digital cameras, wind and solar energy storage power stations, satellite batteries, miner's lamp power supplies, mining rescue cabin power supplies, and military individual soldiers. power supply and many other occasions. According to the latest data released ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G45/12H01M4/505H01M10/0525
CPCC01G45/1242C01P2002/72C01P2004/03C01P2006/40H01M4/505H01M10/0525H01M2004/021Y02E60/10
Inventor 陈建赵娜余东升石冬梅赵军伟王玉江李继利
Owner LUOYANG INST OF SCI & TECH
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