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Lithium ion battery positive electrode material with ultrahigh energy density and preparation method of lithium ion battery positive electrode material with ultrahigh energy density

A lithium-ion battery, cathode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as low capacity and poor electrochemical performance, and achieve the effects of improving discharge specific capacity, inhibiting structure collapse, and good cycle performance.

Active Publication Date: 2017-01-04
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 shortcomings of poor electrochemical performance and low capacity, and provides a bulk phase doped modified lithium ion battery positive electrode material Li(Ni 0.6 co 0.2 mn 0.2 ) 1-x Al x o 2-y f y and its preparation method, wherein 0

Method used

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  • Lithium ion battery positive electrode material with ultrahigh energy density and preparation method of lithium ion battery positive electrode material with ultrahigh energy density
  • Lithium ion battery positive electrode material with ultrahigh energy density and preparation method of lithium ion battery positive electrode material with ultrahigh energy density
  • Lithium ion battery positive electrode material with ultrahigh energy density and preparation method of lithium ion battery positive electrode material with ultrahigh energy density

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Effect test

Embodiment 1

[0034] When Al and F doping amounts are respectively 0.01 and 0.02 (i.e. x=0.01, y=0.02), the nickel source raw material, cobalt source raw material and manganese source raw material are Ni:Co:Mn=6:2 with the total molar ratio: 2 Weigh the sample and divide it into two parts, respectively dissolve it in an appropriate amount of deionized water according to the molar ratio Ni:Co:Mn=5:2:3 and 7:2:1 to prepare a 1mol / L sulfate mixed solution a and b; sodium hydroxide solution and ammonia are mixed to form a mixed solution with a concentration of sodium hydroxide of 2 mol / L and a concentration of ammonia of 0.5 mol / L, which is recorded as solution c; the prepared two solutions a and b are successively mixed with solution c Slowly add it dropwise into the reaction tank with continuous stirring, adjust the pH with ammonia water to control the pH value at about 11, the reaction temperature is 50°C, coprecipitate reaction for 5h, and then age at 70°C for 12h, and then the obtained prod...

Embodiment 2

[0037] When Al and F doping amounts were 0.02 and 0.04 (i.e. x=0.02, y=0.04) respectively, the nickel source raw material, cobalt source raw material and manganese source raw material were Ni:Co:Mn=6:2 with the total molar ratio: 2 Weigh the sample and divide it into two parts, respectively dissolve it in an appropriate amount of deionized water according to the molar ratio Ni:Co:Mn=5:2:3 and 7:2:1 to prepare a 1mol / L sulfate mixed solution a and b; sodium hydroxide solution and ammonia are mixed to form a mixed solution with a concentration of sodium hydroxide of 2 mol / L and a concentration of ammonia of 0.5 mol / L, which is recorded as solution c; the prepared two solutions a and b are successively mixed with solution c Slowly add it dropwise into the reaction tank with continuous stirring, adjust the pH with ammonia water to control the pH value at about 11, the reaction temperature is 50°C, coprecipitate reaction for 5h, and then age at 70°C for 12h, and then the obtained pr...

Embodiment 3

[0040] When Al and F doping amounts were 0.02 and 0.02 (i.e. x=0.02, y=0.02) respectively, the nickel source raw material, cobalt source raw material and manganese source raw material were Ni:Co:Mn=6:2 with the total molar ratio: 2 Weigh the sample and divide it into two parts, respectively dissolve it in an appropriate amount of deionized water according to the molar ratio Ni:Co:Mn=5:2:3 and 7:2:1 to prepare a 1mol / L sulfate mixed solution a and b; sodium hydroxide solution and ammonia are mixed to form a mixed solution with a concentration of sodium hydroxide of 2 mol / L and a concentration of ammonia of 0.5 mol / L, which is recorded as solution c; the prepared two solutions a and b are successively mixed with solution c Slowly add it dropwise into the reaction tank with continuous stirring, adjust the pH with ammonia water to control the pH value at about 11, the reaction temperature is 60°C, coprecipitate reaction for 5h, and then age at 70°C for 12h, and then the obtained pr...

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Abstract

The invention belongs to the field of lithium ion batteries, provides a lithium ion battery positive electrode material with ultrahigh energy density, and aims to overcome the defects that nickel cobalt lithium manganite is poor in electrochemical performance and low in specific capacity and energy density. A molecular expression of the lithium ion battery positive electrode material is Li(Ni0.6Co0.2Mn0.2)1-xAlxO2-yFy, wherein x is greater than 0, and y is smaller than or equal to 0.05; a small amount of aluminum element replaces part of nickel element, and a fluorine element partially replaces an oxygen element, so that an internal structure of the material is stabilized, and structure collapse under a high-proportion lithium-removing state is inhibited; by co-doping aluminum with fluorine, specific discharge capacity and comprehensive electrochemical properties of the material are greatly improved; energy density is remarkably improved; besides, according to the lithium ion battery positive electrode material disclosed by the invention, a precursor material of which nickel elements are gradually distributed is prepared by adopting a gradient coprecipitation method; the concentration of the precursor material is gradually increased from inside to outside, so that the specific discharge capacity of the positive electrode material is favorably improved; a prepared product is high in purity, high in chemical uniformity and high in crystallization quality; products are small in particles, uniform in distribution, excellent in electrochemical performance and lower in manufacturing cost.

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, in particular to a lithium ion battery positive electrode material Li(Ni 0.6 co 0.2 mn 0.2 ) 1-x 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 voltage, high energy density, and no memory effect, and are widely used in portable electronic devices. The earliest positive electrode material 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, it has been fou...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/505H01M4/525
CPCH01M4/48H01M4/505H01M4/525Y02E60/10
Inventor 刘兴泉王震伟赵红远蔡宇谭铭刘珊珊熊伟强陈炳
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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