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Negative electrode material with high temperature resistance, preparation method of negative electrode material and application of negative electrode material in lithium-ion battery

A technology of negative electrode material and polymer material, applied in the field of energy material preparation, can solve the problems of low retention rate and recovery rate, rapid capacity decay of soft carbon and hard carbon, etc., to avoid the formation of new film, low manufacturing cost, improve The effect of electrochemical performance

Active Publication Date: 2018-04-17
深圳贝特瑞钠电新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above-mentioned problems existing in the prior art, the purpose of the present invention is to overcome the problems of rapid capacity decay of soft carbon and hard carbon under high-temperature cycle and low retention rate and recovery rate under high-temperature storage, and provide a negative electrode with high-temperature resistance Material, its preparation method and use in lithium ion battery

Method used

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  • Negative electrode material with high temperature resistance, preparation method of negative electrode material and application of negative electrode material in lithium-ion battery
  • Negative electrode material with high temperature resistance, preparation method of negative electrode material and application of negative electrode material in lithium-ion battery
  • Negative electrode material with high temperature resistance, preparation method of negative electrode material and application of negative electrode material in lithium-ion battery

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Effect test

Embodiment 1

[0096] Dissolve 20g of tris buffer solution in 30g of water, adjust its pH value to 8.5 with ammonia water, then add 15g of dopamine at a stirring rate of 100rpm and stir for 20min, then add 150g of it with a conductivity of 50S / cm and a D50 particle size of 12μm The soft carbon powder was filtered after stirring for 1.5 hours, and then dried in a constant temperature oven at 80° C. to obtain a multifunctional polymer material coating material.

[0097] Take 22.5g Al(NO 3 ) 3 ·9H 2 O was dissolved in 300mL of water, and then 150g of multifunctional polymer coating material was added at an ultrasonic frequency of 100KHZ, followed by ultrasonication for 2h, and finally dried in an incubator at 80°C to obtain a nanomaterial coating material. Nano-coating coating material The coating material is processed in a tube furnace or a box furnace at a heating rate of 2 °C / min to 700 °C for 2 hours to obtain a negative electrode material for a lithium ion battery.

Embodiment 2

[0099] Dissolve 20g of tris buffer solution in 30g of water, adjust its pH value to 12.5 with ammonia water, then add 15g of dopamine at a stirring rate of 150rpm and stir for 20min, then add 150g of it with a conductivity of 50S / cm and a D50 particle size of 12μm The hard carbon powder was stirred for 1.5 hours, then filtered, and then dried in a constant temperature oven at 80° C. to obtain a multifunctional polymer material coating material.

[0100] Take 22.5g Al(NO 3 ) 3 ·9H 2 O was dissolved in 300mL of water, and then 150g of multifunctional polymer material coating material was added at an ultrasonic frequency of 100KHZ, followed by ultrasonication for 2h, and finally dried in a thermostat at 80°C to obtain a nano-coating coating material. The nano-coating coating material is treated in a tube furnace or a box furnace at a heating rate of 2 °C / min to 700 °C for 2 hours to obtain a negative electrode material for a lithium-ion battery.

Embodiment 3

[0102] Dissolve 20g of tris buffer solution in 30g of water, adjust its pH value to 8.5 with ammonia water, then add 15g of dopamine at a stirring rate of 100rpm and stir for 20min, then add 150g of it, the conductivity is 50S / cm, and the D50 particle size is 12μm The soft carbon powder is then stirred and ultrasonicated (the stirring rate is 100rpm and the ultrasonic frequency is 100KHZ) for 1.5h at the same time, and finally filtered and dried in an incubator at 80°C to obtain a multifunctional polymer material coating material.

[0103] Take 22.5g Al(NO 3 ) 3 ·9H 2 O was dissolved in 300mL of water, and then 150g of multi-functional polymer material coating material was added at an ultrasonic frequency of 100KHZ, followed by ultrasonication for 2h, and finally dried in an incubator at 80°C to obtain a nanomaterial coating material. The nano-coating coating material is treated in a tube furnace or a box furnace at a heating rate of 2 °C / min to 700 °C for 2 hours to obtain ...

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Abstract

The invention discloses a negative electrode material with high temperature resistance, a preparation method of the negative electrode material and an application of the negative electrode material ina lithium-ion battery. The negative electrode material comprises soft carbon and / or hard carbon powder particles as a core, a carbon coating and a nano coating, wherein the carbon coating and the nano coating sequentially coat the surface of the core from inside to outside; and the carbon coating is transformed from a multifunctional group polymer material. The method comprises the steps of (1) preparing a material formed by coating soft carbon and / or hard carbon with the multifunctional group polymer material; (2) forming a nano material coating on the surface of the material; and (3) and burning to obtain the negative electrode material. The method disclosed by the invention is simple and feasible in process and low in manufacturing cost, and massive production can be implemented; and the prepared negative electrode material has very excellent electrochemical properties, especially high-temperature cycle performance and high-temperature storage performance, the capacity retention ratio after 50 charge-discharge cycles at high temperature of 45 DEG C and 1C can reach 93.3%, and the capacity retention ratio after discharge at room temperature and 0.1C can reach 98.3%.

Description

technical field [0001] The invention belongs to the field of energy material preparation, and relates to a negative electrode material, its preparation method and application, in particular to a high temperature resistant negative electrode material, its preparation method and its application in lithium ion batteries. Background technique [0002] With the depletion of one-time traditional energy sources such as coal and oil and the increasingly serious pollution of the global ecological environment, lithium-ion batteries have attracted much attention due to their advantages of green environmental protection and clean energy. In addition, lithium-ion batteries are widely used in electric vehicles, hybrid vehicles and portable electronic devices due to their high energy density, long cycle life and light weight. However, with the rapid development of science and technology and the acceleration of the pace of life, the original performance of lithium-ion batteries can no longe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M4/1393H01M10/0525
CPCH01M4/1393H01M4/366H01M4/587H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 李成飞汪福明任建国黄友元岳敏
Owner 深圳贝特瑞钠电新材料科技有限公司
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