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Lithium ion battery and anode active material thereof

A positive active material and lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor cycle stability, capacity fading, and battery performance degradation

Active Publication Date: 2012-03-07
DONGGUAN AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a structural stabilizing unit in layered composite materials, this material can effectively improve the structural stability of the material, but the material itself is an electronic insulator, which greatly limits the rate performance of the material.
Although Li 2 MnO 3 After high-voltage activation, it can exhibit an initial discharge specific capacity of nearly 260mAh / g, but at the same time it exhibits poor cycle stability, and it will be accompanied by the release of oxygen during the electrochemical activation process. Highly active oxygen The occurrence of side reactions with the electrolyte and electrode active materials greatly reduces the performance of the battery, further leading to a large attenuation of capacity

Method used

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  • Lithium ion battery and anode active material thereof
  • Lithium ion battery and anode active material thereof
  • Lithium ion battery and anode active material thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Take α=0, β=0.19, γ=0.15, δ=z=0, and M I for Ni, M II For Co and Al, the molecular formula Li[Li 0.14 Ni 0.19 mn 0.52 co 0.10 Al 0.05 ]O 2 . Prepare NiSO according to the molar ratio of Ni, Co, Mn and Al in the molecular formula 4 , MnSO 4 、CoSO 4 、Al 2 (SO 4 ) 3 The mixed deionized aqueous solution, the cation concentration is controlled at 2.0mol / L. Under the stirring condition of the peristaltic pump, the above mixed solution was added dropwise into another mixed aqueous solution composed of ammonia water and NaOH, the pH was controlled between 10 and 12, and the temperature of the water bath was kept at 60°C. After the reaction is completed, filter, wash, and vacuum-dry at 120° C. for 12 hours to obtain the reaction precursor MOH (M=Ni, Co, Mn, Al). The precursor is proportionally mixed with LiOH·H 2 O was ball milled and mixed in acetone for 1 hour, and then dried at a constant temperature of 60°C. The obtained precursor was first kept at 450°C for 6...

Embodiment 2

[0041] Take α=0.02, β=0.19, γ=0.15, δ=z=0, A is Ag, M I for Ni, M II For Co and Al, the formula Li is obtained 0.98 Ag 0.02 [Li 0.14 Ni 0.19 mn 0.52 co 0.10 Al 0.05 ]O 2 . According to the method in Example 1, the reaction precursor MOH (M=Ni, Co, Mn, Al) was prepared according to the ratio of Ni, Mn, Co, Al in the above molecular formula. The above precursors were proportionally mixed with LiOH·H 2 O and Ag 2 O was ball-milled and mixed in acetone for 1 hour, and then dried at a constant temperature of 60°C. The resulting precursor was kept at a constant temperature of 450°C for 6 hours in an air atmosphere, then heated to 900°C for 12 hours, and cooled to room temperature with the furnace to obtain sample 2:

[0042] Li 0.98 Ag 0.02 [Li 0.14 Ni 0.19 mn 0.52 co 0.10 Al 0.05 ]O 2 . Experiments have found that Ag can partially replace Ni, Co or Al, and the substitution amount is about 6-9 atom% of Ag.

Embodiment 3

[0044] Take α=0.02, β=0.19, γ=0.15, δ=z=0.05, A is Ag, M I for Ni, M II for Co and Al, X for F,

[0045] The molecular formula is obtained as Li 0.98 Ag 0.02 [Li 0.14 Ni 0.19 mn 0.52 co 0.10 Al 0.05 ]O 1.95 f 0.05 of active substances. According to the method in Example 1, the reaction precursor MOH (M=Ni, Co, Mn, Al) was prepared according to the ratio of Ni, Mn, Co, Al in the above molecular formula. The above precursors were proportionally mixed with LiOH·H 2 O, Ag 2 O and LiF were mixed in acetone for 1 hour and dried at a constant temperature of 60°C. The obtained precursor was first kept at 450°C for 6 hours in an air atmosphere, then heated to 900°C for 12 hours, and cooled to room temperature with the furnace to obtain sample 3:

[0046] Li 0.98 Ag 0.02 [Li 0.14 Ni 0.19 mn 0.52 co 0.10 Al 0.05 ]O 1.95 f 0.05 .

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Abstract

The invention relates to the technical field of lithium ion batteries, and in particular relates to an anode active material of the lithium ion battery. The molecular formula of the material is shown as Li(1-alpha)A(alpha)[Li(1 / 3-beta)MI(beta)Mn(2 / 3-gamma)MII(gamma)]O2-deltaXz. The lithium ion battery manufactured by the anode material has the reversible specific capacity which is higher than 200mAh / g, good circulation and heat stability performances and perfect multiplying power performance. The anode materials can meet requirements of the lithium ion battery effectively, such as the high energy density, the high-power density and the long service life and high safety.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, and specifically proposes a lithium-ion battery positive active material with high specific capacity, high cycle and thermal stability, and good rate performance and a lithium ion battery using the active material as a positive active material. Battery. Background technique [0002] With the rise of the low-carbon economy, lithium-ion batteries are also actively developing in the direction of power vehicles and grid energy storage. The development of lithium-ion batteries that can be charged and discharged quickly, with high energy density and adapt to the harsh conditions of use of power vehicles has become a research topic. focus. Lithium-ion battery cathode material is the bottleneck that determines the development of lithium-ion batteries, and it is the decisive factor for the performance and price of lithium-ion batteries. Therefore, the research and development of high-perfo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M10/0525
CPCY02E60/10
Inventor 袁庆丰李伟赵丰刚
Owner DONGGUAN AMPEREX TECH
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