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Method for preparing anode material for lithium ion battery

A cathode material, lithium-ion technology, applied in the field of preparation of cathode materials for lithium-ion batteries, can solve the problems of low 5V capacity, capacity loss, and failure to solve the problem of crystallized oxygen defects in cathode materials

Inactive Publication Date: 2009-04-15
PANASONIC CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there are still some problems, compared to LiMn 2 o 4 , LiMe after some Mn atoms are replaced by transition metal atoms Me 0.5 mn 1.5 o 4 In some occasions, the capacity near the 4V platform is lost. Although there is some compensation at high voltage, most of the compensation is still limited, resulting in a decrease in the total capacity, especially for the first time.
Through continuous research, the capacity of 5V batteries has been made close to the theoretical capacity, but there are still problems that most 5V batteries have two platforms, and the capacity of the 4V platform is still relatively high, and the true 5V capacity is not high. At 50~100mAh·g -1
The problem with the solid-phase method is that the product is impure. The material prepared by the sol-gel method has a fine particle size, uniform particles, and high purity. It does not require pretreatment and is simple and easy to implement. It is the most commonly used liquid-phase method.
However, neither of these two methods can well solve the problem of oxygen defects in the crystallization of cathode materials.

Method used

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  • Method for preparing anode material for lithium ion battery
  • Method for preparing anode material for lithium ion battery
  • Method for preparing anode material for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: lithium-ion battery positive electrode material LiNi 0.5 mn 1.5 o 3.975 f 0.05 Preparation of:

[0029] (a) Weigh 2.0404g lithium acetate (LiAC 2H 2 O), 2.4886g nickel acetate (Ni(AC) 2 4H 2 O), 7.3527g manganese acetate (Mn(AC) 2 4H 2 (0) and 0.0259g lithium fluoride (LiF), dissolved in 50ml deionized water, stirred for 4 hours, the stirring temperature was 80°C until a gel was formed;

[0030] (b) Put it into a quartz cup, in the air atmosphere of the tubular heating furnace, after calcining at 480°C for 5 hours, cool, and mix 3.05g (0.02 mole) of the product with 0.0092g (0.0002 mole) of lithium peroxide , grind evenly;

[0031] (c) Put it into a quartz cup, in the air atmosphere of a tubular heating furnace, calcinate at 800°C for 15 hours, cool, and grind to obtain LiNi, the positive electrode material for lithium-ion batteries. 0.5 mn 1.5 o 3.975 f 0.05 .

[0032] figure 2 Represents the LiNi prepared according to Comparative Example ...

Embodiment 2

[0033] Embodiment 2: positive electrode material LiNi for lithium ion battery 0.5 mn 1.5 o 3.975 f 0.05 Preparation of:

[0034] (a) Weigh 4.0808g lithium acetate (LiAC 2H 2 O), 4.9772g nickel acetate (Ni(AC) 2 4H 2 O), 14.7054g manganese acetate (Mn(AC) 2 4H 2 (0) and 0.0519g lithium fluoride (LiF), dissolved in 100ml deionized water, stirred for 4 hours, the stirring temperature was 80°C until a gel was formed;

[0035] (b) Put it into a quartz cup, in an air atmosphere in a tubular heating furnace, calcinate at 450° C. for 5 hours, cool, mix 6.0579 g of the resulting product with 0.0092 g of lithium peroxide, and grind evenly;

[0036] (c) Put it into a quartz cup, in an oxygen atmosphere in a tubular heating furnace, calcinate at 850°C for 12 hours, cool, and grind finely to obtain LiNi, a positive electrode material for lithium-ion batteries. 0.5 mn 1.5 o 3.975 f 0.05 .

Embodiment 3

[0037] Embodiment 3: positive electrode material LiNi for lithium ion battery 0.5 mn 1.5 o 3.975 f 0.05 Preparation of:

[0038] (a) Weigh 4.0808g lithium acetate (LiAC 2H 2 O), 4.9772g nickel acetate (Ni(AC) 2 4H 2 O), 14.7054g manganese acetate (Mn(AC) 2 4H 2 (0) and 0.0519g lithium fluoride (LiF), dissolved in 100ml deionized water, stirred for 4 hours, the stirring temperature was 80°C until a gel was formed;

[0039] (b) Put it into a quartz cup, in an air atmosphere in a tubular heating furnace, calcinate at 450° C. for 5 hours, cool, mix 6.0579 g of the resulting product with 0.0184 g of lithium peroxide, and grind evenly;

[0040] (c) Put it into a quartz cup, in an oxygen atmosphere in a tubular heating furnace, calcinate at 850°C for 12 hours, cool, and grind finely to obtain LiNi, a positive electrode material for lithium-ion batteries. 0.5 mn 1.5 o 3.975 f 0.05 .

[0041] image 3 Represents the LiNi prepared according to Comparative Example 1 (sample...

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PUM

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Abstract

The invention relates to a preparation method of an anode material for a lithium ion battery. Component of the anode material is LiNi0.5Mn1.5O4-deltaFx, wherein, the delta equals 0.5x, and x is not less than 0.01 and not more than 0.08; the anode material is prepared by combining gel and lithium peroxide under high-temperature heat treatment; the process is simple and the preparation course is easy to be controlled. The first discharge capacity of the material can reach 140mAh / g<-1>, wherein, 5V voltage platform characteristic is obviously improved, and 4V voltage platform is well removed, the charge and discharge efficiency reach more than 96% after repeating the previous cycles, and the material has excellent cycle performance.

Description

technical field [0001] The invention relates to a method for preparing a cathode material for a battery, in particular to a method for preparing an anode material for a lithium ion battery. Background technique [0002] LiMn 2 o 4 Although environmentally friendly and rich in resources, the cycle stability is poor, and its discharge platform is mainly concentrated around 4V. Fields such as electric vehicles require higher voltages, so high-voltage battery cathode materials have become a hot research topic. Different from the electrode materials whose discharge platform is around 3V and 4V, the discharge platform at around 5V is called 5V positive electrode material. Spinel structure LiMe disclosed in USP6,670,076 x mn 2-x o 4 (Me: 3d transition metals of Ti, Cr, Fe, Co, Ni, Cu and Zn) series of 5V positive electrode materials and their preparation methods, and based on this USP6,794,085 disclosed co-doped LiMe x Ni y mn 2-x-y o 4 , indicating new achievements in th...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/48H01M4/04C01G45/00C01G53/00
CPCY02E60/12Y02E60/10
Inventor 杨军徐欣欣努丽燕娜王延强北川雅规
Owner PANASONIC CORP
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