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Surface coating and compounding lithium-rich manganese-based positive electrode material and preparation method of positive electrode material

A lithium-rich manganese-based, surface-coated technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of poor rate performance, low initial charge and discharge efficiency, and achieve high charge and discharge efficiency.

Active Publication Date: 2014-07-02
CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Based on the deficiencies of the prior art, in order to solve the problem of low initial charge and discharge efficiency and poor rate performance of the material, the inventors have repeatedly studied and found that for lithium-rich manganese-based positive electrode materials, by coating a layer of phosphoric acid on the surface At the same time, after high-temperature treatment under an inert gas, a new phase will appear on the surface of the lithium-rich manganese-based material. After testing, it is found that this new phase is lithium iron phosphate, and the lithium source in the new phase formed comes from the lithium-rich manganese-based material. Cathode material

Method used

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  • Surface coating and compounding lithium-rich manganese-based positive electrode material and preparation method of positive electrode material
  • Surface coating and compounding lithium-rich manganese-based positive electrode material and preparation method of positive electrode material
  • Surface coating and compounding lithium-rich manganese-based positive electrode material and preparation method of positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Composite lithium-rich manganese-based cathode material Li[Li 0.15 Ni 0.13 co 0.13 mn 0.54 ]O 1.975 0.05LiFePO 4 (i.e. Li[Li x / 3-y Me 1-x mn 2x / 3 ]O 2-y / 2 ·yLiFePO 4 Where x=0.6, y=0.05, Me=Ni 0.325 co 0.325 mn 0.35 ).

[0039] 1) Li[Li 0.15 Ni 0.13 co 0.13 mn 0.54 ]O 1.975 0.05LiFePO 4 preparation of

[0040] Mix 5.68g nickelous oxide, 6.10g tricobalt tetroxide, 26.69g lithium carbonate, and 36.28g manganese carbonate, add deionized water according to 9 times the weight of the solid powder, and add it to the grinder for grinding until the particle size is less than 0.3 microns. Then spray-dry to obtain a mixed powder of 4 raw materials, calcined at 900°C for 36h, cool with the furnace, and then grind and sieve the powder to obtain Li[Li 0.2 Ni 0.13 co 0.13 mn 0.54 ]O 2 .

[0041] Weigh 2.02 g of ferric nitrate nonahydrate, 0.575 g of ammonium dihydrogen phosphate and 0.24 g of glucose dissolved in 80 mL of water, weigh 8.64 g of the above Li[Li...

Embodiment 2-5

[0047] Example 2-5: A series of lithium-rich manganese-based positive electrode materials coated on the surface Li[Li 0.2-y Ni 0.13 co 0.13 mn 0.54 ]O 2-y / 2 ·yLiFePO 4 (i.e. Li[Li x / 3-y Me 1-x mn 2x / 3 ]O 2-y / 2 ·yLiFePO 4 where x=0.6, Me=Ni 0.325 co 0.325 mn 0.35 ). The value of y is shown in Table 1.

[0048] The preparation method of the material is the same as that provided in Example 1, and the ratio of the corresponding raw materials is calculated according to the chemical formula in this example.

[0049] [Table 1]

[0050] Example

Embodiment 6

[0051] Embodiment 6: the lithium-rich manganese-based cathode material of surface coating composite: Li[Li 0.113 Ni 0.195 co 0.195 mn 0.477 ]O 1.99 0.02LiFePO 4 (i.e. Li[Li x / 3-y Me 1-x mn 2x / 3 ]O 2-y / 2 ·yLiFePO 4 Where x=0.4, y=0.02, Me=Ni 0.325 co 0.325 mn 0.35 ).

[0052] 8.2g nickelous oxide, 8.8g tricobalt tetroxide, 24.21g lithium carbonate, 30.80g manganese carbonate are mixed, add deionized water by 19 times of solid powder weight, join in grinder and grind, until medium particle size is less than 0.3 micron, then Carry out spray drying to obtain the mixed powder of 4 kinds of raw materials, calcinate 25h through 850 ℃, cool with furnace, then powder is ground and sieved to obtain Li[Li 0.133 Ni 0.195 co 0.195 mn 0.477 ]O 2 .

[0053] Weigh 0.808 ferric nitrate nonahydrate, 0.23g ammonium dihydrogen phosphate and 0.12g glucose are dissolved in 80mL water, weigh 8.64g of the above-mentioned Li[Li 0.133 Ni 0.195 co 0.195 mn 0.477 ]O 2 Put it into t...

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Abstract

The invention provides a positive electrode material which is applicable to lithium secondary batteries with high capacity, high charging and discharging efficiency and excellent rate capability. The positive electrode material which is applicable to the lithium secondary batteries is a surface coating and compounding lithium-rich manganese-based positive electrode material. The surface coating and compounding lithium-rich manganese-based positive electrode material is characterized in that an inner layer is made of a lithium-rich manganese-based material; a surface coating and compounding layer is made of a lithium iron phosphate material; the lithium iron phosphate of the surface coating and compounding layer is a novel phase which is generated in a coating and compounding process; a lithium source is selected from the lithium-rich manganese-based positive electrode material and is expressed by a general formula shown as Li[Li<x / 3-y>Me<1-x>Mn<>2x / 3.yLiFePO4; in the general formula, x is greater than 0 and less than 0.8; y is greater than 0 and less than x / 3; Me is selected from at least one of chemical elements comprising Ni, Co, Mn, Cr, Fe, Zn, Al, Mg and Cd. The invention also provides a preparation method of the positive electrode material and a lithium ion secondary battery positive electrode and a lithium-ion secondary battery using the positive electrode material.

Description

technical field [0001] The invention relates to a high-capacity lithium-ion secondary battery cathode material and a preparation method thereof Background technique [0002] Lithium-ion batteries have the characteristics of high energy density and long cycle life, and are considered to be an important "green energy" in the field of electric vehicles and hybrid vehicles in the future. At present, the energy density of lithium-ion batteries cannot meet the needs of pure electric vehicles. The development of high-energy-density lithium-ion batteries and the improvement of the driving range of pure electric vehicles are the key to the development of the electric vehicle industry. The use of cathode materials with high specific capacity is the simplest and most effective way to increase the energy density of lithium-ion batteries. [0003] At present, lithium-rich manganese-based cathode materials have attracted extensive attention due to their high specific capacity (greater th...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/62H01M4/131H01M10/0525
CPCY02E60/122H01M4/131H01M4/366H01M4/505H01M4/525H01M4/5825H01M4/628H01M10/0525Y02E60/10
Inventor 卢华权庄卫东卢世刚王忠孙学义谭翱
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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