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ti4+, al3+, fe3+, f-doped layer-spinel composite lithium-rich cathode material and preparation method

A lithium-rich cathode material, spinel technology, applied in battery electrodes, electrical components, circuits, etc., can solve problems such as incomplete understanding of the mechanism of action, and achieve reduced irreversible capacity loss, good cycle capacity retention, and high ionic conductivity. rate 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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  • ti4+, al3+, fe3+, f-doped layer-spinel composite lithium-rich cathode material and preparation method

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: butyl titanate: Fe(NO 3 ) 3 9H 2 O:Al(NO 3 ) 3 9H 2 O: LiF is 0.585: 0.7275: 0.2425: 0.01: 0.01: 0.01: 0.01 (molar ratio) ratio uniform mixing, joins in deionized water, the amount of substance added is the tartaric acid of 2.5 times of all metal ion total amounts, fully stirs 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 tempera...

Embodiment 2

[0014] Example 2: LiNO 3 :Mn(CH 3 COO) 2 4H 2 O:Ni(CH 3 COO) 2 24H 2 O: butyl titanate: Fe(NO 3 ) 3 9H 2 O:Al(NO 3 ) 3 9H 2 O: LiF is 0.905: 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 4.0 times of all metal ion total amounts, 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 tube f...

Embodiment 3

[0015] Embodiment 3: LiNO 3 :Mn(CH 3 COO) 2 4H 2 O:Ni(CH 3 COO) 2 4H 2 O: butyl titanate: Fe(NO 3 ) 3 9H 2 O:Al(NO 3 ) 3 9H 2 O: LiF is 0.65: 0.705: 0.235: 0.02: 0.02: 0.02: 0.03 (molar ratio) ratio is evenly mixed, joins in deionized water, the amount of substance added is the tartaric acid that the amount of all metal ions is 3.2 times 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 ...

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Abstract

The invention relates to a Ti4+, Al3+, Fe3+, F-co-doped doped layer-spinel composite lithium- enriched anode material Lix+0.5Mn0.75Ni0.25O05x+2 (x is greater or equal to 0 and less than or equal to 0.5). The anode material is characterized of being in the stoichiometric formula as follows: Lix+0.5+0.5m+0.5p-0.5n-y (Mn 0.75 and Ni 0.25) 1-m-n-pAlmTinFepO0.5x+2-yFy, wherein x is greater or equal to 0 and less than or equal to 0.5; m is greater or equal to 0.01 and less than or equal to 0.05; n is greater or equal to 0.01 and less than or equal to 0.05; p is greater or equal to 0.01 and less than or equal to 0.05; and y is greater or equal to 0.01 and less than or equal to 0.06. According to the stoichiometric ratio of the molecular formula, soluble lithium compounds, soluble nickel salts, butyl titanate, Al(NO3)3.9H2O, soluble iron salts and lithium fluoride are dissolved in deionized water; after tartaric acid with the adding mount of 2.5 to 4.0 times as the total amount of all metal ions is added, all the components are fully stirred until being dissolved completely; and then the solution is concentrated, gelled, dried, grinded, decomposed, tabletted and calcined, thereby obtaining the anode material. The prepared anode material has the good circulation capacity retaining ability and the ratio multiplying characteristic.

Description

technical field [0001] The invention relates to the field of manufacturing positive electrode materials of 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 effectively incre...

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 水淼程亮亮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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