Lithium-ion battery cathode material lini 0.6-x co 0.2 mn 0.2 al x o 2-y f y and its preparation method

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor electrochemical performance, improve discharge specific capacity, improve cycle performance, and improve reversible de-intercalation/intercalation capabilities Effect

Active Publication Date: 2019-07-19
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The object of the present invention is to aim at lithium-ion battery cathode material layered nickel cobalt lithium manganese oxide (LiNi 0.6 mn 0.2 co 0.2 o 2 ) has the disadvantage of poor electrochemical performance, and provides a bulk composite co-doped modified lithium-ion battery cathode material LiNi 0.6-x co 0.2 mn 0.2 Al x o 2-y f y and its preparation method, wherein 0

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  • Lithium-ion battery cathode material lini <sub>0.6-x</sub> co <sub>0.2</sub> mn <sub>0.2</sub> al <sub>x</sub> o <sub>2-y</sub> f <sub>y</sub> and its preparation method
  • Lithium-ion battery cathode material lini <sub>0.6-x</sub> co <sub>0.2</sub> mn <sub>0.2</sub> al <sub>x</sub> o <sub>2-y</sub> f <sub>y</sub> and its preparation method
  • Lithium-ion battery cathode material lini <sub>0.6-x</sub> co <sub>0.2</sub> mn <sub>0.2</sub> al <sub>x</sub> o <sub>2-y</sub> f <sub>y</sub> and its preparation method

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Embodiment 1

[0036] The present embodiment provides lithium-ion battery cathode material LiNi 0.6-x co 0.2 mn 0.2 Al x o 2-y f y , x=0.01, y=0.02; that is, Al and F doping amounts are 0.01 and 0.02 respectively, and nickel sulfate, cobalt sulfate, and manganese sulfate are weighed according to the molar ratio Ni:Co:Mn=5.9:2:2, and are formulated into 1.0 mol / L sulfate mixed solution a; mix sodium hydroxide solution and ammonia water to form a mixed solution with a concentration of sodium hydroxide of 2.0 mol / L and a concentration of ammonia water of 0.5 mol / L, which is recorded as solution b; the prepared two solutions a and b are slowly added dropwise into the reaction tank in parallel and continuously stirred, and the pH is adjusted with ammonia water so that the pH value is controlled at about 11. Then the resultant was suction-filtered and washed several times in a circulating water vacuum pump until no sulfate ions were detected in the barium chloride solution, and finally it was...

Embodiment 2

[0040] The present embodiment provides lithium-ion battery cathode material LiNi 0.6-x co 0.2 mn 0.2 Al x o 2-y f y , x=0.02, y=0.04; That is, Al, F doping amounts are 0.02 and 0.04 respectively, take nickel sulfate, cobalt sulfate, manganese sulfate according to molar ratio Ni:Co:Mn=5.8:2:2, be mixed with 1.0 mol / L sulfate mixed solution a; mix sodium hydroxide solution and ammonia water to form a mixed solution with a concentration of sodium hydroxide of 2.0 mol / L and a concentration of ammonia water of 0.5 mol / L, which is recorded as solution b; the prepared two solutions a and b are slowly added dropwise into the reaction tank in parallel and continuously stirred, and the pH is adjusted with ammonia water so that the pH value is controlled at about 11. Then the resultant was filtered and washed several times in a circulating water vacuum pump until no sulfate ions were detected in the barium chloride solution, and finally it was dried and ground to obtain a precursor ...

Embodiment 3

[0043] The present embodiment provides lithium-ion battery cathode material LiNi 0.6-x co 0.2 mn 0.2 Al x o 2-y f y, x=0.01, y=0.04; that is, Al and F doping amounts are 0.01 and 0.04 respectively, and nickel sulfate, cobalt sulfate, and manganese sulfate are weighed according to the molar ratio Ni:Co:Mn=5.9:2:2, and are formulated to be 1.0 mol / L sulfate mixed solution a; mix sodium hydroxide solution and ammonia water to form a mixed solution with a concentration of sodium hydroxide of 2.0 mol / L and a concentration of ammonia water of 0.5 mol / L, which is recorded as solution b; the prepared two solutions a and b are slowly added dropwise into the reaction tank in parallel and continuously stirred, and the pH is adjusted with ammonia water so that the pH value is controlled at about 11. Then the resultant was suction-filtered and washed several times in a circulating water vacuum pump until no sulfate ions were detected in the barium chloride solution, and finally it was...

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Abstract

The present invention belongs to the field of lithium ion battery, which specifically provides a lithium ion battery positive electrode material Lini 0.6‑x CO 0.2 Mn 0.2 AL x O 2‑y F y And its preparation method, where 0 <x, y ≤ 0.05; to overcome the shortcomings of the poor electrochemical properties of the existing nickel cobalt -manganate three -yuan orthopedic material. The present invention has a small amount of aluminum and fluorine to make the lithium ion battery positive material material have a high discharge ratio and excellent circulation performance; in the room temperature environment, when the voltage range is 2.7-4.3V, the constant current charges and discharge electricity When the multiplier is 0.5C, the first discharge ratio capacity of the material can reach 187.9mAh G ‑1 , Circular 20 times can still reach 192.1mAh G ‑1 , The capacity maintenance rate is as high as 102.2 %; when the voltage range increases to 2.7 to 4.5V and the constant current charging electricity multiplier is 0.5C, the initial discharge ratio of the material can reach 225.8mAh G 225.8mAh G ‑1 , Cycle 20 times can still reach 190.2mAh G ‑1 The capacity maintenance rate is 84.2 %. At the same time, the material preparation process is simple and controllable, the product purity is high, the chemical uniformity, the crystalline quality is high, the product is small and the particle size is evenly distributed.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and relates to a lithium-ion battery positive electrode material and a preparation method thereof, specifically LiNi, a lithium-ion battery positive electrode material 0.6-x co 0.2 mn 0.2 Al x o 2-y f y and a preparation method thereof, wherein 0<x, y≤0.05. Background technique [0002] Lithium-ion batteries have the advantages of high potential, high energy density, no memory effect, etc., which have been widely used in portable electronic devices; the first positive electrode used in commercial lithium-ion batteries is LiCoO 2 , but Co is scarce in natural resources, expensive, and pollutes the environment, and LiCoO 2 The actual specific capacity is low, and overcharging will lead to irreversible capacity loss and increase in polarization voltage. Therefore, with the deepening of the research on cathode materials with low price and excellent performance, people have found that th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 刘兴泉王震伟赵红远熊伟强陈炳蔡宇谭铭刘珊珊
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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