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Iron and vanadium synergistically doped lithium-rich manganese-based positive electrode material and preparation method thereof

A cathode material, lithium-rich manganese-based technology, applied in the field of lithium-rich manganese-based cathode materials and its preparation, can solve the problems of poor cycle performance, low initial storage efficiency, etc., achieve convenient operation, improve discharge specific capacity and initial coulombic efficiency , the effect of good application prospects

Inactive Publication Date: 2016-05-04
SHANDONG YUHUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to make up for the deficiencies in the prior art, the present invention provides a lithium-rich manganese-based positive electrode material with synergistic doping of iron and vanadium and a preparation method thereof, which effectively solves the problem of low first-time inventory efficiency of current lithium-rich manganese-based positive electrode materials , poor cycle performance

Method used

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  • Iron and vanadium synergistically doped lithium-rich manganese-based positive electrode material and preparation method thereof
  • Iron and vanadium synergistically doped lithium-rich manganese-based positive electrode material and preparation method thereof
  • Iron and vanadium synergistically doped lithium-rich manganese-based positive electrode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0029] (1) Add 700mL of 0.1mol / L (NH 4 ) 2 SO 4 solution as the reaction bottom solution; the soluble sulfate MnSO 4 ·H 2 O. CoSO 4 ·7H 2 O, NiSO 4 ·6H 2 O is dissolved in deionized water at a molar ratio of 0.46:0.2:0.2 to prepare a 2mol / L mixed salt solution; 0.2mol / L ammonia water is used as a complexing agent, and 2mol / L sodium carbonate solution is used as a precipitating agent , pump all three into a tank containing (NH 4 )2SO 4 In the reaction kettle for the reaction bottom liquid, the stirring speed is controlled to 600rpm, the temperature of the reaction kettle is controlled at 50°C, the flow rate of the precipitant is controlled by the online pH automatic control system, so that the pH value of the reaction system is at 7.7, and the mixed salt solution is controlled at the same time The flow rate of the complexing agent is 1.5mL / min, the flow rate of the complexing agent is 1mL / min, and the reaction time is 5h. The carbonate coprecipitation precursor is prep...

Embodiment 2

[0034] (1) Add 500mL of 0.05mol / L (NH 4 ) 2 SO 4 The solution is used as the reaction bottom solution; the soluble nitrate Mn(NO 3 ) 2 , Co(NO 3 ) 2 ·6H 2 O, Ni(NO 3 ) 2 ·6H 2 O is dissolved in deionized water at a molar ratio of 0.54:0.13:0.13 to prepare a 3mol / L mixed salt solution; 0.5mol / L ammonia water is used as a complexing agent, and 3mol / L sodium bicarbonate solution is used as a precipitate Agent, pump the three into the containing (NH 4 ) 2 SO 4 In the reaction kettle for the reaction bottom liquid, the stirring speed is controlled at 2000rpm, the temperature of the reaction kettle is controlled at 40°C, the flow rate of the precipitant is controlled by the online pH automatic control system, so that the pH value of the reaction system is at 8.5, and the mixed salt solution is controlled at the same time The flow rate of the complexing agent is 2mL / min, the flow rate of the complexing agent is 1.5mL / min, and the reaction time is 4h. The carbonate co-prec...

Embodiment 3

[0038] (1) Add 1000mL0.01mol / L NH to the reactor 4 HCO 3 solution as the reaction bottom solution; the soluble acetate C 4 h 6 MnO 4 4H 2 O, C 4 h 6 NiO 4 4H 2 O, C 4 h 6 CoO 4 4H 2 O is dissolved in deionized water at a molar ratio of 0.50:0.167:0.167 to prepare a 1mol / L mixed salt solution; 0.2mol / L ammonia water is used as a complexing agent, and 1mol / L sodium carbonate solution is used as a precipitating agent , pump all three into the NH-containing 4 HCO 3 In the reaction kettle for the reaction bottom liquid, the stirring speed is controlled to 400rpm, the temperature of the reaction kettle is controlled at 80°C, and the flow rate of the precipitant is controlled by the online ph automatic control system, so that the pH value of the reaction system is 11.5, and the mixed salt solution is controlled at the same time The flow rate of the complexing agent is 2mL / min, the flow rate of the complexing agent is 0.1mL / min, and the reaction time is 8h. The carbonate...

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Abstract

The invention relates to an iron and vanadium synergistically doped lithium-rich manganese-based positive electrode material and a preparation method thereof. A chemical formula is xLi<2>MnO<3>.(1-x)LiMn<1 / 3>Ni<1 / 3>Co<1 / 3>O<2>-Fe<y>V<z>, wherein x is not less than 0.1 and not greater than 0.9, y is not less than 0 and not greater than 0.1, z is not less than 0 and not greater than 0.1, and y+z is not less than 0.005 and not greater than 0.1. In the preparation method of the iron and vanadium synergistically doped lithium-rich manganese-based positive electrode material, a carbonate precursor containing three elements of nickel, cobalt and manganese is prepared through coprecipitation reaction, a doping element is added while the carbonate precursor containing three elements of nickel, cobalt and manganese is mixed with a lithium compound, and the doping element is at least one of Fe and V. The preparation method is simple in technology and convenient to operate, reduces equipment requirement and manufacturing cost, and satisfies industrial production; by co-doping of iron and vanadium, two metallic elements play a role in synergistic effect, specific discharge capacity and initial coulomb efficiency of the lithium-rich manganese-based positive electrode material are improved, and the lithium-rich manganese-based positive electrode material has better application foreground in the fields of power supply and battery energy storage.

Description

(1) Technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium ion batteries, and in particular relates to a lithium-rich manganese-based positive electrode material synergistically doped with iron and vanadium and a preparation method thereof. (2) Background technology [0002] Lithium-ion batteries have the advantages of high specific energy density and specific power density, long cycle life, no memory effect and environmental friendliness, and are considered to be one of the most valuable and promising energy storage devices at present. With the advancement and improvement of technology, lithium-ion batteries have been widely used in consumer electronics equipment (laptops, mobile phones, digital cameras, etc.), medical equipment (pacemakers, insulin pumps, etc.), and military, aerospace, transportation, etc. Transportation (electric vehicles, etc.) and other fields. In order to realize the miniaturization and light w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/52H01M4/62H01M10/0525
CPCH01M4/362H01M4/505H01M4/52H01M4/62H01M10/0525Y02E60/10
Inventor 董鑫周娟董文明李岩刘爱花邵环香李军伟赵成龙高洪森王瑛
Owner SHANDONG YUHUANG NEW ENERGY TECH
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