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Black phosphorus-titanium dioxide-carbon composite anode material and preparation method thereof, and application of black phosphorus-titanium dioxide-carbon composite anode material

A technology of titanium dioxide and negative electrode materials, which is applied in the field of black phosphorus-titanium dioxide-carbon composite negative electrode materials and its preparation, can solve the problems of broken and grown particle powdered solid electrolyte membranes, difficult electrochemical redox reactions, and contact changes between phosphorus and conductive substrates. Poor problems, to achieve the effect of improving electron migration rate, excellent cycle performance, and short time consumption

Inactive Publication Date: 2019-12-03
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, phosphorus materials have the following two key problems: (1) the poor electronic conductivity of phosphorus makes it difficult to carry out electrochemical redox reactions; (2) the volume expansion of phosphorus is large (>300%), resulting in the contact between phosphorus and conductive Deterioration, particle pulverization, and continuous fragmentation and growth of the solid electrolyte membrane ( SEI )

Method used

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  • Black phosphorus-titanium dioxide-carbon composite anode material and preparation method thereof, and application of black phosphorus-titanium dioxide-carbon composite anode material
  • Black phosphorus-titanium dioxide-carbon composite anode material and preparation method thereof, and application of black phosphorus-titanium dioxide-carbon composite anode material

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Embodiment 1

[0028] This embodiment provides a method for preparing a black phosphorus-titanium dioxide-carbon composite negative electrode material, comprising the following steps:

[0029] (1) In a 0.1MPa argon atmosphere glove box, add 1 g of original red phosphorus particles into a ball mill jar with a ball-to-material ratio of 50:1, and perform high-energy pendulum ball milling for 2 hours. The specific operation mode is 30 minutes for one-way operation, 30 minutes for stop operation, 4 times of operation, and the ball milling speed is 1200rmp / min. After the ball milling is completed, the material is taken out from the ball mill tank in an argon atmosphere glove box to obtain black phosphorus powder. .

[0030] (2) In a 0.1MPa argon atmosphere glove box, mix 0.5g of black phosphorus, 0.2g of titanium dioxide, and 0.3g of expanded graphite at a mass ratio of 5:2:3, and then add it to a ball mill tank with a ball-to-material ratio of 50:1 , carry out high-energy pendulum ball milling, ...

Embodiment 2

[0035] This embodiment provides a method for preparing a black phosphorus-titanium dioxide-carbon composite negative electrode material, comprising the following steps:

[0036] (1) In a 0.1MPa argon atmosphere glove box, add 1 g of original red phosphorus particles into a ball mill jar with a ball-to-material ratio of 40:1, and perform high-energy pendulum ball milling for 5 hours. The specific operation mode is 30 minutes of one-way operation time, 30 minutes of stop operation time, 10 times of operation, and the ball milling speed is 1100rmp / min. After the ball milling is completed, the material is taken out from the ball milling tank in an argon atmosphere glove box to obtain black phosphorus powder. .

[0037](2) In a 0.1MPa argon atmosphere glove box, mix 0.5g of black phosphorus, 0.1g of titanium dioxide, and 0.4g of expanded graphite in a mass ratio of 5:1:4, and then add it to a ball mill tank with a ball-to-material ratio of 50:1 , carry out high-energy pendulum bal...

Embodiment 3

[0040] This embodiment provides a method for preparing a black phosphorus-titanium dioxide-carbon composite negative electrode material, comprising the following steps:

[0041] (1) In a 0.1MPa argon atmosphere glove box, add 1 g of original red phosphorus particles into a ball mill jar with a ball-to-material ratio of 20:1, and perform high-energy pendulum ball milling for 10 hours. The specific operation mode is 30 minutes of one-way operation time, 30 minutes of stop operation time, 20 times of operation, and the ball milling speed is 1000rmp / min. After the ball milling is completed, the material is taken out from the ball mill tank in an argon atmosphere glove box to obtain black phosphorus powder. .

[0042] (2) In a 0.1MPa argon atmosphere glove box, mix 0.6g of black phosphorus, 0.2g of titanium dioxide, and 0.2g of expanded graphite at a mass ratio of 6:2:2, and then add it to a ball mill tank with a ball-to-material ratio of 50:1 , carry out high-energy pendulum ball...

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Abstract

The invention discloses a black phosphorus-titanium dioxide-carbon composite anode material and a preparation method thereof, and application of a black phosphorus-titanium dioxide-carbon composite anode material. The preparation method comprises the following steps that: red phosphorus is subjected to a ball-milling reaction in an inert gas protective atmosphere to obtain nanoscale black phosphorus; black phosphorus, titanium dioxide and a carbon material are mixed in an inert gas protective atmosphere to obtain a mixture, and ball milling on the mixture is performed to obtain a black phosphorus-titanium dioxide-carbon composite anode material. Carbon and black phosphorus are linked through a C-P bond, so that tight contact between black phosphorus and the carbon material in the chargingand discharging process is guaranteed, and volume change in the black phosphorus lithium intercalation process is relieved. Ti-O-P bonds exist between titanium dioxide and black phosphorus, the utilization rate of the active material black phosphorus can be effectively increased, and the electron migration rate at the interface is increased. The black phosphorus-titanium dioxide-carbon composite anode material prepared by the invention is used as a lithium ion battery anode material, and shows the excellent cycle performance and the relatively high reversible capacity.

Description

technical field [0001] The invention relates to a battery material that can be used to prepare lithium ion batteries, in particular to a black phosphorus-titanium dioxide-carbon composite negative electrode material and its preparation method and application. Background technique [0002] Lithium-ion battery (LIB) is a relatively mature rechargeable battery at present. It not only has the characteristics of high specific capacity, long cycle life, no memory effect, low self-discharge rate, etc., but also has little pollution, meets environmental protection requirements, and can be widely used in Electric vehicles, aerospace, biomedical engineering and other fields. With the rapid development of science and technology around the world, the advancement of lithium-ion battery technology can no longer meet the growing needs of emerging energy applications, which usually require higher power / energy density and longer life, especially in power energy market as well as the grid en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/362H01M4/38H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 欧阳柳章周峰晨刘军胡仁宗杨黎春朱敏
Owner SOUTH CHINA UNIV OF TECH
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