Preparation method of lithium/potassium ion battery negative electrode material

A technology of battery negative electrode and negative electrode material, applied in electrode manufacturing, battery electrode, carbon preparation/purification, etc., can solve the problems of no practical application research, no anthracite pyrolysis carbon material, low-cost preparation, etc., and achieve abundant reserves , good for diffusion and storage, short time-consuming effect

Pending Publication Date: 2021-09-07
CHINA THREE GORGES UNIV
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Problems solved by technology

In addition, this study did not conduct experiments on the practical application of anthracite pyrolytic carbon materials in potassium-ion batteries, so its application range also shows great limitations.
In 2016, in the research paper "Advanced sodium-ion batteries using superior lowcost pyrolyzed anthracite anode: towards practical applications", Li et al. directly pyrolyzed anthracite to obtain anthracite pyrolysis carbon materials, and performed sodium-ion half-cell and Full-battery testing, demonstrating the potential of anthracite pyrolytic carbon for practical applications in Na-ion batteries, providing a promising anode material for commercialization of Na-ion batteries, but not its application in Li / K-ion batteries practical application of research
As far as related invention patents are concerned, there is no patent application for the preparation of low-cost lithium / potassium ion battery anode materials using anthracite as raw material

Method used

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  • Preparation method of lithium/potassium ion battery negative electrode material
  • Preparation method of lithium/potassium ion battery negative electrode material
  • Preparation method of lithium/potassium ion battery negative electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Example 1 Anthracite pyrolysis carbon material I

[0031] Pulverize block anthracite to obtain anthracite powder with a specific surface area of ​​1-10 m 2 g -1 , with an average pore size of 1-10 nm, placed in an argon atmosphere, heat-treated at 900 °C for 2 h, and cooled to room temperature to obtain anthracite pyrolytic carbon material A-900. figure 1 (a) Scanning electron micrograph and (b) high-resolution transmission electron micrograph of the anthracite pyrolysis carbon material prepared for , it can be seen from the figure that the anthracite pyrolysis carbon material presents a block shape with smooth surface and irregular shape , its microstructure presents a disordered / ordered hybrid structure, which is significantly different from the long-range ordered structure of graphite. In addition, the selected area electron diffraction pattern of the anthracite pyrolysis carbon material also shows unclear diffraction rings, which also proves that it has a typical...

Embodiment 2

[0032] Example 2 Anthracite pyrolysis carbon material II

[0033] Pulverize block anthracite to obtain anthracite powder with a specific surface area of ​​1-10 m 2 g -1 , with an average pore size of 1-10 nm, placed in an argon atmosphere, heat-treated at 700 °C for 2 h, and cooled to room temperature to obtain anthracite pyrolytic carbon material A-700. The test conditions of the anthracite pyrolytic carbon material are as described in Example 1, and the results show that in the lithium-ion half-cell, the anthracite pyrolytic carbon material can be tested at 100 mA g -1 Under the current density, the reversible capacity after 60 cycles is 317.0 mAh g -1 . In a potassium-ion half-cell, the anthracite pyrolytic carbon material operates at 100 mA g -1 Under the current density, the reversible capacity after 60 cycles is 137.4mAh g -1 . The experimental results show that the anthracite pyrocarbon with disordered / ordered mixed carbon layer structure is mainly stored in defe...

Embodiment 3

[0034] Example 3 Anthracite pyrolysis carbon material III

[0035] Pulverize block anthracite to obtain anthracite powder with a specific surface area of ​​1-10 m 2 g -1 , with an average pore size of 1-10 nm, placed in an argon atmosphere, heat-treated at 1100 °C for 2 h, and cooled to room temperature to obtain anthracite pyrolytic carbon material A-1100. The test conditions of the anthracite pyrolytic carbon material are as described in Example 1, and the results show that in the lithium-ion half-cell, the anthracite pyrolytic carbon material can be tested at 100 mA g -1 Under the current density, the reversible capacity after 60 cycles is 319.3 mAh g -1 . In a potassium-ion half-cell, the anthracite pyrolytic carbon material operates at 100 mA g -1 Under the current density, the reversible capacity after 60 cycles is 118.5mAh g -1 . As the pyrolysis temperature increases, the defect degree of anthracite pyrolysis carbon material decreases, and the lithium storage an...

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Abstract

The invention discloses a preparation method of a lithium/potassium ion battery negative electrode material, which comprises the steps of crushing blocky anthracite to obtain anthracite powder, placing the anthracite powder in a protective atmosphere, and carrying out heat treatment to obtain an anthracite pyrolytic carbon negative electrode material. The obtained lithium ion battery anthracite pyrolytic carbon negative electrode material still shows the reversible specific capacity of 62.0 mAh g <-1 > after 500 cycles under the current density of 1 A g <-1 >, the capacity retention rate reaches 69.3%, while a commercial graphite negative electrode shows the specific capacity of 24.4 mAh g <-1 >, and the capacity retention rate is only 28.4%. The prepared anthracite pyrolytic carbon shows more excellent electrochemical performance than graphite in a potassium ion half-cell, and the potassium storage capacity, the cycling stability and the like of the anthracite pyrolytic carbon material can be effectively improved through doping of elements such as N or P.

Description

technical field [0001] The invention discloses a preparation method and application of a practical low-cost lithium / potassium ion battery negative electrode material, belonging to the technical field of battery materials. Background technique [0002] In recent years, due to the advantages of small size, long cycle life, high power density, low self-discharge rate, and no memory effect, lithium-ion batteries have almost always been the best choice for energy storage devices, dominating the charging of mobile electronic devices and electric vehicles. battery market. At the same time, because potassium has more abundant natural resources than lithium, and potassium ions have a similar working mechanism to lithium ions in electrode materials, potassium ion batteries have gradually attracted the attention and research of researchers. [0003] In the research of secondary batteries, in addition to factors such as positive electrode materials and electrolytes, negative electrode ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/62H01M4/04H01M4/133H01M10/0525H01M10/054C01B32/05
CPCH01M4/583H01M4/622H01M4/625H01M4/0404H01M4/133H01M10/0525H01M10/054C01B32/05H01M2004/027H01M2004/021Y02E60/10
Inventor 陶华超刘心宇唐春燕杨学林
Owner CHINA THREE GORGES UNIV
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