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Lithium ion battery anode material and manufacturing method thereof

A lithium-ion battery, cathode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems affecting material cycle performance, poor thermal stability, poor structural stability, etc., to improve high-rate performance and cycle stability. The effect of improving the stability, thermal stability, and cycle performance

Inactive Publication Date: 2010-06-09
深圳市天骄科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the material has the following problems: (1) poor compatibility with the electrolyte, which may easily lead to deterioration of the cycle performance of the battery, especially in the case of high current charge and discharge
(2) Since Li + Radius and Ni 2+ The radii are very close, and it is easy to mix and arrange, which makes the structural stability poor, thus affecting the cycle performance of the material
(3) The thermal stability of the material is poor
[0004] In recent years, the ternary material LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 The research mainly focuses on doping and surface coating. After different degrees of doping and surface coating modification, the thermal stability, cycle performance, and high-rate performance of the material can be improved. However, most of them are single Doping and simple physical coating between particles cannot fundamentally solve the problem

Method used

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  • Lithium ion battery anode material and manufacturing method thereof
  • Lithium ion battery anode material and manufacturing method thereof
  • Lithium ion battery anode material and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Dissolve Ni, Co, Mn, Mg sulfate in deionized water at a ratio of 0.31:0.31:0.31:0.07 to form a solution with a total concentration of 2mol / L; 4mol / L sodium hydroxide solution, respectively, with a metering pump The salt solution and the alkali solution were evenly pumped into a stainless steel reaction tank filled with distilled water, the pH value of the reaction was controlled to be 11, the temperature was 50° C., and the reaction was carried out at a stirring speed of 1000 rad / min for 20 h. The precipitated product was filtered, washed, and dried at 300°C for 8 hours to obtain the precursor A1.

[0033] The mixture of LiOH and HF (the molar ratio of LiOH and LiF is 1.96:0.04) and the prepared precursor A 1 The molar ratio is metal lithium moles: precursor total metal moles = 1.1:1, fully mixed, and the fully mixed powder is sintered at 980 ° C for 12 hours, and ground to obtain product B 1 , B 1 The molecular formula is:

[0034] Li 1.05 [Ni 0.31 co 0.31 mn 0....

Embodiment 2

[0042] Dissolve Ni, Co, Mn, Al sulfate in the ratio of 0.31:0.31:0.31:0.07 in deionized water to form a solution with a total concentration of 2mol / L; 4mol / L sodium hydroxide solution, respectively, with a metering pump The salt solution and the alkali solution were evenly pumped into a stainless steel reaction tank filled with distilled water, the pH value of the reaction was controlled to be 11, the temperature was 50° C., and the reaction was carried out at a stirring speed of 1000 rad / min for 20 h. After the precipitated product was filtered and washed, it was dried at 300°C for 8 hours to obtain the precursor A 2 .

[0043] The mixture of LiOH and HF (the molar ratio of LiOH and LiF is 1.96:0.04) and the prepared precursor are fully mixed at a molar ratio of metal lithium moles: precursor total metal moles=1.1:1, fully The mixed powder was sintered at 980°C for 12h, and ground to obtain product B 2 , B 2 The molecular formula is:

[0044] Li 1.05 [Ni 0.31 co 0.31 m...

Embodiment 3

[0049] Dissolve Ni, Co, Mn, Cr sulfate in deionized water at a ratio of 0.31:0.31:0.31:0.07 to form a solution with a total concentration of 2mol / L; 4mol / L sodium hydroxide solution, respectively, with a metering pump The salt solution and the alkali solution were evenly pumped into a stainless steel reaction tank filled with distilled water, the pH value of the reaction was controlled to be 11, the temperature was 50° C., and the reaction was carried out at a stirring speed of 1000 rad / min for 20 h. After the precipitated product was filtered and washed, it was dried at 300°C for 8 hours to obtain the precursor A 3 .

[0050]The mixture of LiOH and HF (the molar ratio of LiOH and LiF is 1.96:0.04) and the prepared precursor are fully mixed at a molar ratio of metal lithium moles: precursor total metal moles=1.1:1, fully The mixed powder was sintered at 980°C for 12h, and ground to obtain product B 3 , B 3 The molecular formula is:

[0051] Li 1.05 [Ni 0.31 co 0.31 mn ...

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Abstract

The invention provides a lithium ion battery anode material Li1+x[Ni(1 / 3-y)Co(1 / 3-y)Mn(1 / 3-y)M3y]1-xO2-zFz-Al(OH)3 (wherein M can be Mg, Al, Cr, Fe or Ti; x is not less than 0 and not more than 0.15; and z is not less than 0 and not more than 0.1) and a manufacturing method thereof. The method comprises the following steps of: doping a metal element M in LiCo1 / 3Ni1 / 3Mn1 / 3O2 by adopting a codeposition method to form a precursor; then calcining the precursor and a lithium salt doped with LiF at the temperature of 950-1000 DEG C to from an intermediate; next, preparing an Al(OH)3 emulsion from aluminium isopropoxide, isopropanol and distilled water; and finally adding the intermediate into the emulsion, stirring for 4-6 hours at the temperature of 45-55 DEG C, filtering and drying to form the anode material of the invention.

Description

technical field [0001] The invention relates to a lithium-ion battery positive electrode material and a manufacturing method thereof, in particular to a doped and coated modified lithium nickel cobalt manganese oxide positive electrode material Li 1+x [Ni (1 / 3-y) co (1 / 3-y) mn (1 / 3-y) m 3y ] 1-x o 2-z f z -Al(OH) 3 (wherein M=Mg, Al, Cr, Fe or Ti; 0≤x≤0.15; 0≤y≤0.04; 0≤z≤0.1) and its manufacturing method. It belongs to the technical field of energy materials. Background technique [0002] The current commercial lithium-ion battery cathode material is mainly layered LiCoO 2 , LiCoO 2 The discharge platform is high, the capacity is high, the cycle performance is good, and the production process is easy to control, and the product performance is stable. However, its disadvantages are that Co is toxic and cobalt resources are limited, the price of raw materials is high and fluctuates greatly, and at the same time, thermal stability, safety performance and high rate pe...

Claims

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Application Information

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IPC IPC(8): H01M4/48
CPCY02E60/12Y02E60/10
Inventor 王伟东李建刚唐有根谭欣欣
Owner 深圳市天骄科技开发有限公司
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