Potassium ion battery negative electrode material, preparation method thereof and potassium ion battery

A battery negative electrode and potassium ion technology, applied in the direction of battery electrodes, negative electrodes, secondary batteries, etc., can solve the problem of the first coulombic efficiency of the battery, etc., and achieve the effect of taking into account the first coulombic efficiency, taking into account the capacity, and reducing side reactions

Active Publication Date: 2021-12-28
深圳华算科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a negative electrode material for a potassium ion battery, a preparation method thereof and a...

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  • Potassium ion battery negative electrode material, preparation method thereof and potassium ion battery
  • Potassium ion battery negative electrode material, preparation method thereof and potassium ion battery
  • Potassium ion battery negative electrode material, preparation method thereof and potassium ion battery

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preparation example Construction

[0028] Based on the foregoing, the present invention discloses a negative electrode material for a potassium ion battery, a preparation method thereof, and a potassium ion battery, including:

[0029] S1. Prepare the carbon molecular sieve raw material; the carbon molecular sieve is a carbon raw material with a certain pore structure, which can meet the porosity requirement of the negative electrode material of the potassium ion battery.

[0030] In a specific embodiment, nitrogen-producing carbon molecular sieves with a micropore diameter of 0.28-0.38nm are directly purchased as the raw material of the carbon molecular sieve. There are many kinds of commercial nitrogen-producing molecular sieves, and the pore size will be slightly different, but the first Coulombic efficiency is the same. Between 65-75%; the first coulombic efficiency after heat treatment at 800°C is 75%; the first coulombic efficiency after heat treatment at 1500°C can be greater than 85%, and the capacity is...

Embodiment 1

[0050] Direct purchase of nitrogen-making carbon molecular sieves with a micropore diameter of 0.28 to 0.38nm is used as the carbon molecular sieve raw material as the potassium ion negative electrode material, and the TEM diagram of the potassium ion negative electrode material is as follows figure 2 shown.

Embodiment 2

[0052] Directly purchase nitrogen-producing carbon molecular sieves with a micropore diameter of 0.28-0.38nm as the carbon molecular sieve raw material, heat the carbon molecular sieve raw material to 800°C in an atmosphere of nitrogen with a purity of 99.99%, and keep it warm for 2 hours to obtain the potassium Ionic anode materials.

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Abstract

The invention relates to a potassium ion battery negative electrode material, a preparation method thereof and a potassium ion battery. The preparation method comprises the following steps: preparing a carbon molecular sieve raw material; and carrying out heat treatment on the carbon molecular sieve raw material to obtain the potassium ion battery negative electrode material. According to the preparation method of the potassium ion battery negative electrode material in the scheme, the pore structure of a hard carbon electrode is optimized in a heat treatment mode, so that the size of the pore is smaller than that of a potassium ion electrolyte molecule, the electrolyte molecule cannot enter the pore of the electrode material, side reaction is reduced, but potassium ions can enter the pore, therefore, the capacity of the battery can be high, and the capacity and the first coulombic efficiency of the battery are both considered.

Description

technical field [0001] The invention belongs to the technical field of potassium ion batteries, and in particular relates to a negative electrode material of a potassium ion battery, a preparation method thereof and a potassium ion battery. Background technique [0002] Lithium-ion batteries have a high energy density, and after their industrialization in the 1990s, they rapidly promoted the revolutionary development of many fields such as smartphones, cameras, notebook computers, and electric vehicles. However, the development of lithium batteries seems to have encountered a "bottleneck period" until now. The energy density has increased slowly, and the cost has not decreased rapidly. Abundance has been challenged. Therefore, people have been looking for a new secondary battery technology to make up for the shortage of lithium batteries. [0003] Existing technology usually uses graphite as the negative electrode of potassium-ion batteries, but its capacity is limited. I...

Claims

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Application Information

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IPC IPC(8): C01B32/05C01B39/32C01B39/38C01B39/20C01B39/26C01B37/00H01M4/587H01M10/054
CPCC01B32/05C01B39/32C01B39/38C01B39/20C01B39/26C01B37/005H01M4/587H01M10/054H01M2004/027C01P2004/80C01P2006/16C01P2006/12C01P2006/14C01P2006/40Y02E60/10
Inventor 张思伟张冉冉杨磊赵建伟
Owner 深圳华算科技有限公司
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