O2 configured lithium battery positive electrode material and preparation method thereof

A cathode material and lithium-ion battery technology, which is applied in the field of lithium-ion battery materials and electrochemistry, can solve the problems of electric vehicles not being widely used, the specific energy density of batteries is limited, and the problem of not being able to be better solved, and achieve uniform particle size. Small, simple steps, high tap density effect

Active Publication Date: 2018-06-05
PEKING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the limitation of the specific energy density of the battery makes it impossible for electric vehicles to meet the needs of most users, so they have not been widely used.
At present, the main factor limiting the specific energy density of batteries is the cathode material. Several mainstream materials on the market LiCoO 2 (140mAh / g), LiFePO 4 (160mAh / g), LiMn 2 o 4 (150mAh / g) The specific capacity is lower than 200mAh / g, which can meet the requirements of high capacity lithium-rich manganese-based cathode xLi 2 MnO 3 ·(1-x)LiMO 2 (250mAh / g) The problem of voltage decline has not been solved well for a long time, so finding a high-capacity and structurally stable lithium battery cathode material is a major task in the current lithium battery research field
[0003] O2-Li x MO 2 (M=Co, Ni, Mn) was reported as early as 1999 (Journal of The Electrochemical Society, 146 (10) 3560-3565 (1999)) that it has a spinel phase transition that does not occur during electrochemical cycling characteristics, but its low reversible capacity and low lithium content limit its research space

Method used

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  • O2 configured lithium battery positive electrode material and preparation method thereof
  • O2 configured lithium battery positive electrode material and preparation method thereof
  • O2 configured lithium battery positive electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Embodiment 1, sol-gel synthesis O2 configuration ternary lithium-rich material Li[Li 0.2 mn 0.54 co 0.13 Ni 0.13 ]O 2

[0042] Dissolve 0.61g of lithium acetate, 3.4g of sodium acetate, 0.97g of nickel acetate, 3.97g of manganese acetate, 0.97g of cobalt acetate, 16.811g of citric acid and 7.4484g of ethylene glycol in 350mL of deionized water, stir and mix well. Put it in a pear-shaped bottle, and then rotate it in a rotary evaporator, the temperature is set at 80° C., and the rotation speed is 55 rpm. After steaming into a gel, place it in a vacuum oven at 150°C for more than 5 hours. Take out the dried gel, grind it, and place it in a tube furnace for 4 hours at 450°C for pre-calcination, followed by calcination at 800°C for 8 hours to obtain the sodium-containing precursor product——Na 0.833 [Li 0.2 mn 0.54 Ni 0.13 co 0.13 ]O 2 .

[0043] The sodium-containing precursor was mixed with 2 times the molar amount of molten salt LiNO 3 , LiCl(LiNO 3 : LiCl=0...

Embodiment 2

[0046] Example 2, O2 configuration binary lithium-rich material Li[Li[Li] synthesized by co-precipitation method 0.25 mn 0.498 co 0.252 ]O 2

[0047] Take 0.039mol CoSO 4 ·6H 2 O, 0.081mol MnSO 4 ·H 2 O was dissolved in 60mL of deionized water and stirred evenly to form a salt solution, and then 0.132mol of Na 2 CO 3 Mix with 2mL ammonia solution whose concentration is 18.4mol / L to make 60mL alkali solution. Use a peristaltic pump to drop lye and salt solution into the deionized water at the same time, keep the pH between 7.5-8.5, and heat it in a water bath at a temperature of 60° C., while stirring continuously, and the stirring speed is 500 rpm.

[0048] After the dropwise addition, the obtained suspension was left to age for more than 12 hours, then filtered with a Buchner funnel, and washed with deionized water for more than 3 times. The precipitate obtained by filtration is dried in a vacuum oven at 80°C for more than 8 hours, and then ground to obtain the prec...

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Abstract

The invention discloses an O2 configured lithium battery positive electrode material and a preparation method thereof. The material is mainly of an O2 configured stratified structure, and comprises lithium ion layers, transitional metal layers and oxygen atom layers, wherein the oxygen atom layers are arrayed periodically by taking the interval of the two transitional metal layers as a period; andthe chemical formula is Lia(LixMy)O2, wherein M is selected from one or more of Mn, Ni, Co and Fe, a is more than or equal to 5/6 and smaller than or equal to 1, x is more than or equal to 0.2 and smaller than or equal to 0.35, and x+y is equal to 1. The performance is extremely excellent, first coulombic efficiency is between 95%-105%, the reversible capacity is up to 398mAh/g under 10mA/g multiplying power, the phase change from a stratified phase to a spinel phase cannot occur in the circulation, and the synthetic method is simple and convenient for industrialized mass production.

Description

technical field [0001] The invention belongs to the field of lithium ion battery materials and electrochemistry, and relates to a brand-new O2 configuration layered cathode material and a preparation method thereof. Background technique [0002] Lithium-ion battery is a secondary battery with repeatable charging and discharging characteristics. It has been developed for many years. Its application involves many fields such as transportation, entertainment, military, medical and communication. Battery electric vehicles have high application prospects due to their environmental friendliness. However, due to the limitation of battery specific energy density, electric vehicles cannot meet the needs of most users, so they have not been widely used. At present, the main factor limiting the specific energy density of batteries is the cathode material. Several mainstream materials on the market LiCoO 2 (140mAh / g), LiFePO 4 (160mAh / g), LiMn 2 o 4 (150mAh / g) The specific capacity...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 左宇轩夏定国
Owner PEKING UNIV
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