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a cr 3+ ,mg 2+ ,fe 3+ , f - Co-doped composite lithium-rich cathode material and preparation method thereof

A lithium-rich cathode material and co-doping technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of fast capacity decay, incomplete understanding of the mechanism of action, poor cycle stability, etc., and achieve low reversibility, Effect of reducing irreversible capacity loss and improving cycle capacity retention

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

AI Technical Summary

Problems solved by technology

5O 2 The cycle stability is not good, and the capacity decays quickly after multiple cycles. When the charge and discharge current increases, the capacity decays quickly
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> ,mg <sup>2+</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:Mg(NO 3 ) 2 ·6H 2 O:Fe(NO 3 ) 3 ·9H 2 O:Cr(NO 3 ) 3 ·9H 2 O: LiF is 1.091: 0.5365: 0.4365: 0.009: 0.009: 0.009: 0.009 (molar ratio) and mix evenly, add it to deionized water, add tartaric acid whose amount is 1.5 times the total amount of all metal ions, and stir well to Completely dissolved; the temperature of the system was raised to 70°C and stirring was continued until 71% of the water evaporated, at which point the solution gradually became viscous and jelly-like. The jelly-like material 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 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 the powder was further ground in a mortar for 10 minutes. The powder was pressed with a pressure of 100 MPa. Then, the temperature is raised to 8...

Embodiment 2

[0014] Example 2: LiNO 3 : Mn(CH 3 COO) 2 ·4H 2 O:Ni(CH 3 COO) 2 ·4H 2 O:Mg(NO 3 ) 2 ·6H 2 O:Fe(NO 3 ) 3 ·9H 2 O:Cr(NO 3 ) 3 ·9H 2 O: LiF is 1.465: 0.7125: 0.2125: 0.025: 0.025: 0.025: 0.03 (molar ratio), mix evenly, add it to deionized water, add tartaric acid whose amount is 2.5 times the total amount of all metal ions, and stir well to Completely dissolved; the temperature of the system was raised to 85°C and stirring was continued until 85% of the water evaporated, at which point the solution gradually became viscous and jelly-like. 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 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 ground in a mortar for 30 minutes, and the powder was pressed with a pressure of 300MPa. Then, the temperature is raised to 950°C in a tube furnace at a ra...

Embodiment 3

[0015] Example 3: LiNO 3 : Mn(CH 3 COO) 2 ·4H 2 O:Ni(CH 3 COO) 2 ·4H 2 O:MgCl 2 ·6H 2 O:Fe(NO 3 ) 3 ·9H 2 O:Cr(NO 3 ) 3 ·9H 2 O: LiF is 1.168: 0.576: 0.376: 0.016: 0.016: 0.016: 0.024 (molar ratio) and mix evenly, add it to deionized water, and add tartaric acid whose amount is 2.0 times the total amount of all metal ions and stir well to Completely dissolved; the temperature of the system was raised to 78°C and stirring was continued until 78% of the water evaporated, at which point the solution gradually became viscous and jelly-like. The jelly-like material 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 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 the powder was further ground in a mortar for 20 minutes. The powder was pressed with a pressure of 200 MPa. Then, the temperature is raised to 900°C ...

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PUM

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Abstract

The invention discloses a Cr3<+>, Mg<2+>, Fe<3+> and F<-> co-doped layer-layer composite lithium-rich anode material xLi2MnO3.(1-x)LiMn0.5Ni0.5O2(x is not less than 0 and not more than 0.5). The Cr3<+>, Mg<2+>, Fe<3+> and F<-> co-doped layer-layer composite lithium-rich anode material is characterized in that a stoichiometric equation of the anode material is xLi2MnO3.(1-x)Li1+n-y(Mn0.5Ni0.5)1-m-n-pCrmMgnFepO2-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 magnesium salt, soluble chromium salt, 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<+>, Mg<2+>, Fe<3+> and F<-> co-doped layer-layer 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 a positive electrode material of a lithium ion battery. Background technique [0002] Lithium-ion batteries have the absolute advantages of high volume, high weight-to-energy ratio, high voltage, low self-discharge rate, no memory effect, long cycle life, and high power density. It has an annual share of more than 30 billion US dollars in the global mobile power market and far exceeds other The market share of batteries is the most promising chemical power source [Wu Yuping, Wan Chunrong, Jiang Changyin, Lithium Ion Secondary Battery, 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 improve t...

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 冯琳水淼程亮亮杨天赐舒杰任元龙郑卫东高珊徐晓萍
Owner NINGBO UNIV
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