High-tap-density nickel-cobalt-manganese laminated composite material and low-energy-consumption preparation method thereof

A lithium-nickel-cobalt-manganese compound technology is applied in the field of lithium-ion battery materials and their preparation, which can solve the problems of high requirements for reaction equipment, poor uniformity, and narrow particle size distribution, and achieves reduced synthesis costs, high discharge specific capacity, The effect of high magnification and high capacity

Inactive Publication Date: 2012-12-05
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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AI Technical Summary

Problems solved by technology

The high-temperature solid-state method is currently used to prepare LiNi1 / 3Co1 / 3Mn1 / 3O2 positive electrode The main method of materials, but the tap density of the prepared product is between 1.6 g / cm3-1.8 g / cm3, the uniformity is not good, and the electrochemical performance Room for improvement
In order to overcome the above shortcomings, researchers have proposed many new synthesis processes, such as coprecipitation, sol-gel method, spray drying method, hydrothermal method, spray pyrolysis method, etc. Among these new synthesis processes, the first three Although some achievements have been made in the control of particle morphology and the uniformity of the product, the product prepared by the hydroxide co-precipitation method has the characteristics of high sphericity, narrow particle size distribution, and large tap density, which has been deeply studied. However, the preparation process must go through long-term high-temperature calcination, and the problem of energy consumption has become increasingly prominent; although the latter two can shorten the reaction time and lower the reaction temperature, they have high requirements for reaction equipment, which is not conducive to industrial application.

Method used

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  • High-tap-density nickel-cobalt-manganese laminated composite material and low-energy-consumption preparation method thereof
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  • High-tap-density nickel-cobalt-manganese laminated composite material and low-energy-consumption preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] LiOH·H 2 O and Li 2 CO 3 According to its eutectic composition (molar ratio of 0.76:0.24), mix it with a mortar, and then mix it with the precursor Ni 1 / 3 co 1 / 3 mn 1 / 3 (OH) 2 Mix in a molar ratio of 1.2:1. The mixture was placed in an alumina crucible, kept at 480 °C for 2 h in an air atmosphere, treated at 850 °C for 2 h, and then cooled to room temperature with the furnace to obtain spherical LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 Cathode material (see figure 1 ), the tap density is 2.11 g / cm 3 .

[0028] The prepared material was used as the positive electrode material, the lithium sheet was used as the counter electrode, Celgard 2400 was used as the separator, and the electrolyte was 1.0 mol L -1 LiPF 6 / EC+DMC (EC:DMC=1:1 volume ratio), assembled into a CR2025 button cell in a stainless steel glove box filled with argon. The constant current constant voltage charge and discharge test is carried out on the Land BT2001A automatic battery test system, and the char...

Embodiment 2

[0030] LiOH·H 2 O and Li 2 CO 3 Mix with a mortar according to its eutectic composition, and then mix with the precursor Ni 1 / 3 co 1 / 3 mn 1 / 3 (OH) 2 and LiCl were mixed at a molar ratio of 1.2:1:0.05, the mixture was placed in an alumina crucible, kept at 480°C for 2 h in an air atmosphere, treated at 850°C for 5 h, and then cooled to room temperature with the furnace to obtain spherical LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 1.95 Cl 0.05 , with a tap density of 2.00 g / cm 3 . Between 2.7-4.6V, the first discharge specific capacity at 0.1C is 218.7mAh / g, and after 20 cycles at 0.1C, the discharge specific capacity is 216.1mAh / g. The specific capacity of the first discharge at 0.2C is 208.6 mAh / g. The cycle life curve is attached image 3 shown. Test conditions such as embodiment 1.

Embodiment 3

[0032] LiOH·H 2 O and Li2 CO 3 Mix with a mortar according to its eutectic composition, and then mix with the precursor Ni 1 / 3 co 1 / 3 mn 1 / 3 (OH) 2 , LiBr were mixed at a molar ratio of 1.2:1:0.05, the mixture was placed in an alumina crucible, kept at 480°C for 2 h in an air atmosphere, treated at 900°C for 5 h, and then cooled to room temperature with the furnace to obtain spherical LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 1.95 Br 0.05 , with a tap density of 2.32 g / cm 3 . The first discharge capacity at 0.2C is 196.0 mAh / g. The cycle life curves at different magnifications are attached Figure 4 shown. The test conditions are as in Example 1.

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Abstract

The invention relates to a high-tap-density nickel-cobalt-manganese laminated composite material and a low-energy-consumption preparation method thereof, and provides a lithium-ion battery anode material lithium nickel 1 (LiNi1) / 3 cobalt (3Co1) / 3 manganese 1 (3Mn1) / 3 oxygen (O2)-yXy (wherein X is one or more of fluorine (F), chloride (Cl) or bromine (Br), and y is more than zero and less than or equal to 0.2) and a preparation method thereof. The preparation method comprises following steps that firstly the Ni1 / 3Co1 / 3Mn1 / 3(OH)2 is adequately mixed with fused salt and then is heat preserved for 2 to 20 hours under the temperature of 400 to 1000 DEG C to prepare the anode material. The lithium-ion battery anode material has characteristics of high tap density, good multiplying capacity and long service life under high cut-off voltage. According to the preparation method, the heat treatment temperature is reduced, the heat treatment time is shortened, a great amount of electric quantity is saved, the production efficiency is improved and a favorable industrialized application prospect is reflected.

Description

Technical field [0001] The present invention involves lithium -ion battery materials and its preparation methods, and specifically involves a lithium -ion battery positive pole material lini 1 / 3 CO 1 / 3 Mn 1 / 3 O 2-y X y Among them, one or more in X = F, CL, or BR, 0 <y ≤ 0.2.The invention also involves the preparation of the material. Background technique [0002] Lini 1 / 3 CO 1 / 3 Mn 1 / 3 O 2 The positive electrode material can give full play to the synergy between Ni, CO, and MN, which has the advantages of higher capacity, good circulation performance and reliable thermal stability.EssenceHigh -temperature solid phase is currently preparing Lini 1 / 3 CO 1 / 3 Mn 1 / 3 O 2 The main method of positive materials, but the product of the product prepared is 1.6 g / cm 3 -1.8 g / cm 3 Between, uniformity, and electrochemical properties need to be improved.In order to overcome the shortcomings of the above, researchers have proposed many new synthetic processes, such as co-sedimentation method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122Y02E60/10
Inventor 陈召勇李奇峰
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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