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Positive electrode material preparation used for lithium ion batteries and modification method thereof

A lithium-ion battery and cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of low discharge capacity, achieve the effects of reducing manganese dissolution, increasing capacity, and stabilizing the lattice structure

Inactive Publication Date: 2019-04-05
JIANGSU JINYI NEW ENERGY TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention proposes a preparation method of doping with metal elements and modifying the cathode material of manganese-based lithium-ion batteries coated with high-stability metal oxides. This method effectively improves the existing lithium-ion The problem of low discharge capacity after doping of manganese-based cathode materials for batteries can effectively improve the interfacial film impedance between electrolyte and cathode materials, and can significantly improve cycle and rate performance

Method used

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  • Positive electrode material preparation used for lithium ion batteries and modification method thereof
  • Positive electrode material preparation used for lithium ion batteries and modification method thereof
  • Positive electrode material preparation used for lithium ion batteries and modification method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Fe-doped nickel manganese oxide material LiNi 0.5-x Mmm 1.5-x Fe 2x 0 4 (x=0.05) Preparation

[0028] 1. Mix 0.268g LiCH 3 COO·2H 2 O, 0.280g Ni(CHsCOO) 2H 2 O, 0.888g Mn(CH 3 COO)·4H 2 O, 0.0615g Fe(CH 3 COO)2 4H 2 O was dissolved in 20 mL of deionized water, and 80 mL of ethanol was added for stirring to obtain a metal salt solution.

[0029] 2. Add 0.780g of H 2 C 2 o 4 Dissolve in 30mL deionized water to form an oxalic acid solution.

[0030] 3. Quickly pour the metal salt solution into the oxalic acid solution and stir for 5 hours, and then evaporate at 80° C. for 10 hours to obtain the precipitation of the oxalate precursor.

[0031] 4. Raise the temperature at a rate of 5C / min, pre-calcine the oxalate precursor in the air at 450°C for 8 hours, and then calcinate at the same rate to 800°C for 15 hours to obtain the target product LiNi 0.45 mn 1.45 Fe 0.1 o 4 .

[0032] The prepared Fe-doped lithium nickel manganese oxide material LiNi 0.5-x Mmm...

Embodiment 2

[0034] Co-doped nickel-rich layered Li-ion battery cathode material Li 1.2 Ni 0.19 co 0.01 mn 0.6 o 2 preparation of

[0035] 1. Add 0.402g LiCH 3 COO·2H 2 O, 0.149g Ni(CHsCOO) 2 2H 2 O, 0.460g Mn(CHsCOO) 2 4H 2 O, 0.050g Co(CH 3 COO) 2 4H 2 O was dissolved in 20 mL of deionized water, and then 80 mL of ethanol was added for stirring to obtain a metal salt solution.

[0036] 2. Add 0.570g of H 2 C 2 o 4 Dissolve in 10mL deionized water and 40ml ethanol to form an oxalic acid solution.

[0037] 3. Quickly pour the metal salt solution into the oxalic acid solution and stir for 5 hours, and then evaporate at 80° C. for 10 hours to obtain the precipitation of the oxalate precursor.

[0038] 4. Raise the temperature at a rate of 5°C / min, pre-calcine the oxalate precursor in the air at 450°C for 8 hours, and then raise the temperature to 850°C for 20 hours at the same heating rate to obtain the target product Li 1.2 Ni 0.19 co 0.01 mn 0.6 o 2 .

[0039] The pr...

Embodiment 3

[0041] Cr, Co co-doped lithium nickel manganese oxide material LiNi 0.45 mn 1.45 co 0.06 Cr 0.05 o 4 preparation of

[0042] 1. Add 0.268gLiCH 3 COO·2H 2 O, 0.280gNi(CH 3 COO) 2 2H 2 O, 0.888g Mn(CH 3 COO) 2 4H 2 O, 0.031g Co(CH 3 COO) z 4H 2 O, 0.029g Cr(CCH 3 COO) 2 Dissolve in 20mL of deionized water, then add 80mL of ethanol and stir to obtain a metal salt solution.

[0043] 2. Add 0.78g of H 2 C 2 o 4 Dissolve in 40mL deionized water to obtain oxalic acid solution.

[0044] 3. Quickly pour the metal salt solution into the oxalic acid solution and stir for 5 hours, and then evaporate at 80° C. for 10 hours to obtain the precipitation of the oxalate precursor.

[0045] 4. Raise the temperature at a rate of 5°C / min, deposit the oxalate precursor in the air at 450°C for 8 hours, and then calcinate at 850°C for 20 hours at the same heating rate to obtain the target product LiNi 0.45 mn 1.45 co 0.06 Cr 0.05 o 4 .

[0046] The prepared Co, Cr co-doped ...

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Abstract

The invention discloses a volume phase metallic element doped positive electrode material used for lithium ion batteries and a preparation method of the material for cladding, relates to the field ofsecondary batteries, in particular to a volume phase metallic element doped positive electrode material used for lithium ion batteries and a preparation method of the material for carrying out cladding modification on high-stability oxides. The doping of metallic elements for the positive electrode material used for manganese-based lithium ion batteries is carried out by using a coprecipitation method of a water-ethyl alcohol system, the cladding of the high-stability oxides for the positive electrode material is carried out by using a liquid phase method of the water-ethyl alcohol system, anddoping modification is carried out on the base material, so that the specific discharge capacity of the material is improved; secondary reactions between the positive electrode material and an electrolyte are reduced through cladding, so that the positive electrode material has preferable cycle performance, the consumption of lithium ions in the charging and discharging process is reduced througha compact and uniform cladding layer, and the capacity of the material and the rate capability are improved. The positive electrode material used for lithium ion batteries disclosed by the inventionis used in the field of batteries.

Description

technical field [0001] The invention belongs to the field of preparation of positive electrode materials for buried ion batteries, in particular to a preparation method for doping the positive electrode materials of manganese-based lithium ion batteries with metal elements and performing surface modification on the same. technical background [0002] Chemical energy is the key link in the development of major new energy technologies at present. Lithium-ion batteries with the advantages of high working voltage, high energy density, long cycle life, and no pollution have been widely used and developed. In order to meet large-scale applications in electric vehicles, hybrid vehicles, and sustainable energy storage, higher requirements are put forward for the energy density, cycle performance, and safety performance of lithium-ion batteries. An important research direction for the development of these aspects of ion batteries. [0003] Manganese-based cathode materials include l...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 刘云建范晓健吕军
Owner JIANGSU JINYI NEW ENERGY TECH CO LTD
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