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Lithium ion battery anode material Li(Ni0.8Co0.1Mn0.1)1-xYxO2 and preparation method

A lithium-ion battery, 1-xyxo2 technology, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of poor electrochemical cycle performance and poor safety performance, and achieve improved electrochemical performance and lower pH value , the effect of decreasing surface alkalinity

Active Publication Date: 2018-09-04
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to aim at lithium-ion battery cathode material layered high-nickel-nickel-cobalt lithium manganate (LiNi 0.8 mn 0.1 co 0.1 o 2 ) The disadvantages of poor electrochemical cycle performance and poor safety performance provide a lithium-ion battery cathode material Li(Ni 0.8 co 0.1 mn 0.1 ) 1-x Y x o 2 and its preparation method, wherein 0

Method used

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  • Lithium ion battery anode material Li(Ni0.8Co0.1Mn0.1)1-xYxO2 and preparation method
  • Lithium ion battery anode material Li(Ni0.8Co0.1Mn0.1)1-xYxO2 and preparation method
  • Lithium ion battery anode material Li(Ni0.8Co0.1Mn0.1)1-xYxO2 and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] When the excess amount of lithium and the doping amount of yttrium are respectively 10% and 0.02 (that is, x=0.02), 1.1656g LiOH·H 2 O, dissolved in 10ml deionized water, added 0.0565g Y 2 o 3 , grind evenly, then add 2.2852g of precursor and absolute ethanol, grind until rheological mixed slurry is obtained, and then continue to grind under infrared light until it becomes a mixed powder completely; then put it in an oven to dry and grind into fine powder , and finally put the fine powder into a tube furnace and heat it up to 470°C at a speed of 3°C / min under an oxygen atmosphere (oxygen flow rate 400ml / min) for pre-calcination for 6 hours, and then heat up to 780°C at a speed of 2°C / min for roasting 15h, and then lowered the temperature to 450-500°C with a 2°C / min program, and finally cooled to room temperature with the furnace to grind the product to obtain Li(Ni 0.8 co 0.1 mn 0.1 ) 0.98 Y 0.02 o 2 .

[0032] For the prepared lithium ion battery cathode materi...

Embodiment 2

[0035] When the excess amount of lithium and the doping amount of yttrium are respectively 5% and 0.02 (that is, x=0.02), 1.1126g LiOH·H 2 O, dissolved in 10ml deionized water, added 0.0565g Y 2 o 3 , grind evenly, then add 2.2852g precursor and absolute ethanol, grind until rheological mixed slurry is obtained, then continue grinding under infrared lamp until it becomes a mixed powder completely; then put it in an oven to dry and grind finely, and finally Put it into a tube furnace under an oxygen atmosphere (oxygen flow rate 400ml / min) at a rate of 3°C / min to 470°C for pre-calcination for 6h, and then at a rate of 2°C / min to 780°C for 15h, Then the temperature was lowered to 450-500°C with a program of 2°C / min, and finally the product was ground after cooling to room temperature with the furnace to obtain Li(Ni 0.8 co 0.1 mn 0.1 ) 0.98 Y 0.02 o 2 .

[0036] For the prepared lithium ion battery cathode material Li(Ni 0.8 co 0.1 mn 0.1 ) 0.98 Y 0.02 o 2 The const...

Embodiment 3

[0039] When the excess amount of lithium and the doping amount of yttrium are respectively 10% and 0.01 (that is, x=0.01), 1.1656g LiOH·H 2 O, dissolved in 10ml deionized water, added 0.0283g Y 2 o 3 , grind evenly, then add 2.2509g precursor and absolute ethanol, grind until rheological mixed slurry is obtained, then continue grinding under infrared light until it becomes a mixed powder completely; then put it in an oven to dry and grind finely, and finally Put it into a tube furnace under an oxygen atmosphere (oxygen flow rate 400ml / min) at a rate of 3°C / min to 470°C for pre-calcination for 6h, and then at a rate of 2°C / min to 780°C for 15h, Then the temperature was lowered to 450-500°C with a program of 2°C / min, and finally the product was ground after cooling to room temperature with the furnace to obtain Li(Ni 0.8 co 0.1 mn 0.1 ) 0.99 Y 0.01 o 2 .

[0040] For the prepared lithium ion battery cathode material Li(Ni 0.8 co 0.1 mn 0.1 ) 0.99 Y 0.01 o 2 The con...

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PUM

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Abstract

The invention belongs to the field of lithium ion batteries and provides a lithium ion battery anode material Li(Ni0.8Co0.1Mn0.1)1-xYxO2 and a preparation method thereof. In the formula, x is greaterthan 0 and less than or equal to 0.05, and the material is used for overcoming defects that LiNi0.8Mn0.1Co0.1O2 is poor in electrochemical circulation property and poor in security property. Accordingto the material, bulk phase doping modification is carried out, mixed cation arrangement of the material is reduced through doping a very small amount of a yttrium element, an Li<+> diffusion channelcan be increased, the diffusion capability of Li<+> in the material can be improved, internal structures of the material can be stabilized, and the circulation stability of the material can be remarkably improved; in addition, by virtue of the capability that metallic yttrium ions have an oxygen storage function, Ni<4+> ions in the material have very high oxidation activity when lithium of the material is removed at a high voltage; in addition, due to O2- absorption functions of the yttrium ions, the surfaces of Ni<4+> ions can be passivated, the oxidability of electrolyte can be weakened, and the security of recharge and discharge at a high voltage can be improved; due to LiYO2 lithium fast ion conductor generated on the surface, not only is the ionic conductivity improved, but also thesurface alkalinity of the material can be degraded. By adopting the lithium ion battery anode material, relatively large multiplying power recharge and discharge and high-energy density requirements can be met, and in addition, the security under a high-voltage recharge and discharge condition can be greatly improved.

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 0.8 co 0.1 mn 0.1 ) 1-x Y x o 2 and a preparation method thereof, wherein 0<x≤0.05. Background technique [0002] Driven by the research and development of new energy materials and related industries, lithium-ion battery cathode materials are rapidly developing towards higher energy density, volume specific energy, cycle life, safety and lower cost. Among the wide variety of positive electrode materials, the current industrialized positive electrode materials mainly include the following types: lithium cobaltate, lithium iron phosphate, lithium manganate and ternary materials; among them, ternary materials can be divided into nickel, cobalt, manganese and nickel according to their chemical composition. Two types of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/626H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 刘兴泉张美玲胡友作谭铭刘珊珊舒小会冉琪文李浩
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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