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Lithium ion battery cathode material as well as preparation method and applications thereof

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, carbon preparation/purification, circuits, etc., can solve problems such as difficulty in industrialized production, low temperature performance and specific capacity of materials, and cumbersome preparation and operation process. , to achieve the effect of enhancing lithium storage capacity, excellent high-rate performance, and simple production process

Active Publication Date: 2013-04-17
天津市贝特瑞新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the negative electrode material prepared by this method does not solve the problems of low-temperature performance and specific capacity of the material, and uses multi-stage temperature-rising polymerization, and the preparation process is cumbersome (including suction filtration, extraction, sieving, demagnetization, etc. steps) , it is difficult to achieve industrial production

Method used

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  • Lithium ion battery cathode material as well as preparation method and applications thereof
  • Lithium ion battery cathode material as well as preparation method and applications thereof
  • Lithium ion battery cathode material as well as preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Example 1 Preparation of anode material for lithium ion battery

[0051] The method for preparing the negative electrode material of the lithium ion battery in this embodiment includes the following steps:

[0052] (1) Preparation of mesophase spheres

[0053] Weigh 900g of medium-temperature petroleum pitch and 100g of cobalt nitrate, add them to the reaction kettle, stir until the mixture is uniform, heat up to 400°C at a rate of 2°C / min, and hold at a constant temperature of 10Mpa for 5 hours for thermal polycondensation reaction. Obtain a reaction mixture mother liquor containing mesophase spheres;

[0054] (2) Low temperature carbonization treatment of mesophase spheres

[0055] Add 2kg of washing oil to the reaction mixture mother liquor obtained in step (1), stir and wash for 2 hours, after centrifugal separation, the mesophase spheres are obtained. Under the protection of nitrogen, the mesophase spheres are carbonized at 800°C for 8 hours, and the temperature ...

Embodiment 2

[0058] Example 2 Preparation of anode material for lithium ion battery

[0059] The method for preparing the negative electrode material of the lithium ion battery in this embodiment includes the following steps:

[0060] (1) Preparation of mesophase spheres

[0061] Weigh 1000g of medium-temperature coal tar pitch and 80g of nickel nitrate into the reactor, stir until the mixture is uniform, heat up to 420°C at a rate of 2°C / min, and keep it at a constant temperature of 15Mpa for 4 hours for thermal condensation reaction to obtain The reaction mixture mother liquor of phase carbon microspheres;

[0062] (2) Low temperature carbonization treatment of mesophase spheres

[0063] Add 2.5kg of washing oil to the reaction mixture mother liquor obtained in step (1), stir and wash for 3 hours, after centrifugal separation, the mesophase spheres are obtained. Under the protection of nitrogen, the mesophase spheres are carbonized at 850°C for 6 hours. The heating rate is 5℃ / min to o...

Embodiment 3

[0066] Example 3 Preparation of anode material for lithium ion battery

[0067] The method for preparing the negative electrode material of the lithium ion battery in this embodiment includes the following steps:

[0068] (1) Preparation of mesophase spheres

[0069] Weigh 1000g of medium-temperature coal tar pitch and 80g of ferric nitrate into the reactor, stir until the mixture is uniform, heat up to 430°C at a rate of 2°C / min, and hold at a constant temperature of 20Mpa for 5 hours for thermal polycondensation reaction. The reaction mixture mother liquor of phase carbon microspheres;

[0070] (2) Low temperature carbonization treatment of mesophase spheres

[0071] Add 2.5 kg of washing oil to the reaction mixture mother liquor obtained in step (1) and wash for 3 hours. After centrifugal separation, mesophase spheres are obtained. Under the protection of nitrogen, the mesophase spheres are carbonized at 900°C for 5 hours. It is 3℃ / min to obtain mesocarbon microspheres af...

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Abstract

The invention relates to a lithium ion battery cathode material as well as a preparation method and applications of the lithium ion battery cathode material. The cathode material is an intermediate-phase carbon microsphere after low-temperature carbonization treatment, impregnation doping treatment and low-temperature sintering treatment, and are spherical or similar spherical with the ratio of long diameter to short diameter less than 2; and micro crystal structures in the cathode material are in unordered arrangement. The battery cathode material provided by the method provided by the invention has the advantages of rapid electric charge and discharge with large current, high lithium storage capability, high capacity, excellent high-rate performance and low-temperature performance and the like; and the discharge capacity under 25 DEG C can reach 412mAh / g, the discharge capacity under -20 DEG C can reach 328mAh / g, the rate performance is favorable, and the specific capacity under 20C current test in circulation for 100 times is not less than 340mAh / g, thus the high requirements on rate performance and circulation performance by a power battery can be met well.

Description

technical field [0001] The invention relates to the field of lithium-ion battery materials, in particular to a lithium-ion battery negative electrode material, a preparation method and an application thereof. Background technique [0002] In today's world, energy is increasingly scarce, governments and major auto companies are stepping up the development of emission-free and pollution-free electric vehicles. As a new type of rechargeable battery, lithium-ion battery has the advantages of high working voltage, large specific energy, high energy density, good safety performance, environmental protection, no pollution, and no memory effect. It has been used in mobile communications, notebook computers, and large-scale storage Energy and other fields are widely used, and will have broad application prospects in electric vehicles, hybrid vehicles, military equipment, aerospace, defense industry, space technology and other fields. The rapid development of these fields has put for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/587C01B31/02H01M4/1393C01B32/05
CPCY02E60/10
Inventor 杨红强苗艳丽张俊平李花
Owner 天津市贝特瑞新能源科技有限公司
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