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a cr 3+ , al 3+ ,fe 3+ , f - Co-doped composite lithium-rich cathode material and preparation method thereof

A lithium-rich cathode material, co-doping technology, applied in battery electrodes, electrical components, circuits, etc., can solve problems such as incomplete understanding of the mechanism of action, achieve good cycle capacity retention, expand diffusion channels, and low reversibility. Effect

Inactive Publication Date: 2016-07-06
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mechanism of doping lithium ions on the electrochemical performance of materials is not yet fully understood

Method used

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  • a cr <sup>3+</sup> , al <sup>3+</sup> ,fe <sup>3+</sup> , f <sup>-</sup> Co-doped composite lithium-rich cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: LiNO 3 :Mn(CH 3 COO) 2 4H 2 O:Ni(CH 3 COO) 2 4H 2 O:Cr(NO 3 ) 3 9H 2 O:Fe(NO 3 ) 3 9H 2 O:Al(NO 3 ) 3 9H 2 O: LiF is 0.595: 0.7275: 0.2425: 0.01: 0.01: 0.01: 0.01 (molar ratio) and is mixed evenly, added to deionized water, the amount of added substance is tartaric acid 1.5 times the total amount of all metal ions and fully stirred until Dissolve completely; raise the temperature of the system to 70°C and continue to stir until 71% of the water evaporates, at this time the solution gradually becomes viscous and forms a jelly. The jelly-like substance was dried in an oven at 130° C. for 22 hours and then ground in a mortar for 10 minutes. The obtained powder was heated up to 500°C at a rate of 2°C / min in a tube furnace and calcined at this temperature for 3 hours. After cooling, the powder was taken out and continued to grind in a mortar for 10 minutes, and the powder was pressed with a pressure of 100MPa. After being formed into a sheet, the t...

Embodiment 2

[0014] Example 2: LiNO 3 :Mn(CH 3 COO) 2 4H 2 O:Ni(CH 3 COO) 2 4H 2 O:Cr(NO 3 ) 3 9H 2 O:Fe(NO 3 ) 3 9H 2 O:Al(NO 3 ) 3 9H 2 O: LiF is 0.955: 0.6375: 0.2125: 0.05: 0.05: 0.05: 0.06 (molar ratio) ratio is evenly mixed, joins in deionized water, the amount of substance added is the tartaric acid of all metal ions total amount 2.5 times and fully stirs to Dissolve completely; raise the temperature of the system to 85°C and continue to stir until 85% of the water evaporates, then the solution gradually becomes viscous and forms a jelly. The jelly-like mass was dried in an oven at 200° C. for 48 hours and then ground in a mortar for 30 minutes. The obtained powder was heated up to 600°C at a rate of 10°C / min in a tube furnace and calcined at this temperature for 5 hours. After cooling, the powder was taken out and continued to grind in a mortar for 30 minutes, and the powder was pressed with a pressure of 300MPa. It was formed into a sheet, and then calcined in a tu...

Embodiment 3

[0015] Embodiment 3: LiNO 3 :Mn(CH 3 COO) 2 4H 2 O:Ni(CH 3 COO) 2 4H 2 O:Cr(NO 3 ) 3 9H 2 O:Fe(NO 3 ) 3 9H 2 O:Al(NO 3 ) 3 9H 2O: LiF is 0.67: 0.705: 0.235: 0.02: 0.02: 0.02: 0.03 (molar ratio) ratio uniform mixing, joins in deionized water, the amount of added substance is tartaric acid 2.0 times of all metal ions total amount and fully stirs to Dissolve completely; raise the temperature of the system to 78°C and continue to stir until 78% of the water evaporates, at this time the solution gradually becomes viscous and forms a jelly. The jelly-like mass was dried in an oven at 170° C. for 35 hours and then ground in a mortar for 20 minutes. The obtained powder was heated up to 550°C at a rate of 7°C / min in a tube furnace and calcined at this temperature for 4 hours. After cooling, the powder was taken out and continued to grind in a mortar for 20 minutes, and the powder was pressed with a pressure of 200MPa. After being formed into a sheet, the temperature was...

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Abstract

The invention discloses a Cr3<+>, Al<3+>, Fe<3+> and F<-> co-doped layer-spinelle composite lithium-rich anode material Li(x+0.5)Mn0.75Ni0.25O(0.5x+2) (x is not less than 0 and not more than 0.5). The Cr3<+>, Al<3+>, Fe<3+> and F<-> co-doped layer-spinelle composite lithium-rich anode material is characterized in that a stoichiometric equation of the anode material is Lix+0.5+0.5m+0.5p+0.5n-y(Mn0.75Ni0.25)1-m-n-pAlmCrnFepO0.5x+2-yFy, wherein x is not less than 0 and not more than 0.5, m is not less than 0.01 and not more than 0.05, n is not less than 0.01 and not more than 0.05, p is not less than 0.01 and not more than 0.05 and y is not less than 0.01 and not more than 0.06. The preparation method comprises the following steps: adding soluble lithium compound, soluble manganese salt, soluble nickel salt, soluble chromium salt, Al(NO3)3.9H2O, soluble iron salt and lithium fluoride into deionized water according to the stoichiometric ratio of the molecular formula; adding tartaric acid of which the mol ratio is 1.5-2.5 times of the total amount of metal ions and uniformly and fully stirring until the mixture is dissolved; and condensing, gelating, drying, grinding, decomposing, tabletting and calcining the solution to obtain the Cr3<+>, Al<3+>, Fe<3+> and F<-> co-doped layer-spinelle composite lithium-rich anode material. The prepared anode material has excellent circulation capacity holding capacity and magnification characteristic.

Description

technical field [0001] The invention relates to the field of manufacturing positive electrode materials of lithium-rich lithium ion batteries. Background technique [0002] Lithium-ion batteries have absolute advantages such as high volume, high weight-to-energy ratio, high voltage, low self-discharge rate, no memory effect, long cycle life, and high power density. They have an annual share of more than 30 billion US dollars in the global mobile power market and far exceed other The market share of batteries is the most promising chemical power source [Wu Yuping, Wan Chunrong, Jiang Changyin, Lithium-ion Secondary Batteries, Beijing: Chemical Industry Press, 2002.]. However, since the commercialization of lithium-ion batteries in 1991, the actual specific capacity of cathode materials has always hovered between 100-180mAh / g, and the low specific capacity of cathode materials has become a bottleneck for improving the specific energy of lithium-ion batteries. In order to effe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/10
Inventor 程亮亮水淼杨天赐舒杰冯琳任元龙郑卫东高珊徐晓萍
Owner NINGBO UNIV
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