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Phosphorus-based positive electrode material for lithium battery and application of phosphorus-based positive electrode material

A positive electrode material, lithium battery technology, applied in the direction of battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of large volume expansion, potential safety hazards, poor battery reversibility, etc., to achieve high specific capacity, good electronic conductivity, low The effect of the diffusion barrier

Active Publication Date: 2020-08-18
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the volume expansion of phosphorene during charge / discharge is too large, especially when it is used as an electrode material for sodium batteries, the volume expansion is as high as 308%, which will lead to poor reversibility of the battery and pose a very serious safety hazard.

Method used

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  • Phosphorus-based positive electrode material for lithium battery and application of phosphorus-based positive electrode material
  • Phosphorus-based positive electrode material for lithium battery and application of phosphorus-based positive electrode material
  • Phosphorus-based positive electrode material for lithium battery and application of phosphorus-based positive electrode material

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Embodiment 1

[0033] Example 1: BP 2 +LiPF 6 + Graphite makes up lithium-ion batteries. Single layer BP 2 material as the positive electrode, LiPF 6 The ethylene carbonate solution is used as the electrolyte, and the graphite is used as the negative electrode battery system. Among them, graphite is abundant and cheap in nature, and carbonate solvents have good electrochemical stability and are one of the organic solvents commonly used in lithium-ion batteries. from BP 2 From the perspective of the theoretical specific capacity of the material, diffusion barrier and electronic conductivity, the comprehensive performance of this battery is better.

Embodiment 2

[0034] Example 2: BP 2 +NaPF 6 + Graphite makes up sodium-ion batteries. Single layer BP 2 material as the positive electrode, NaPF 6 The ethylene carbonate solution is used as the electrolyte, and the graphite is used as the negative electrode battery system. from BP 2 From the perspective of the ultra-low diffusion barrier of the material, electronic conductivity, and good structural stability during the process of intercalation and deintercalation of sodium, the comprehensive performance of this battery is good.

[0035] The present invention borrows the idea of ​​"Material Genome Project" to search for positive electrode materials that can increase theoretical capacity, shorten charging and discharging time and have stable structure. Through the first-principles calculation and simulation research on a large number of phosphorus-based compounds, and the analysis of their lattice structure, electronic structure, ion transport, theoretical capacity and other properties,...

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Abstract

The invention discloses a phosphorus-based positive electrode material for a lithium battery and application of the phosphorus-based positive electrode material. The chemical formula of the phosphorus-based positive electrode material is represented by the following formula: BP2, wherein B is a boron element, and P is a phosphorus element. The BP2 is of a single-layer structure and comprises threelayers of graphene-shaped structures, namely, the first layer of graphene-shaped structure, the second layer of graphene-shaped structure and the third layer of graphene-shaped structure in sequence.Both the first layer of graphene and the second layer of graphene consist of B atoms and P atoms in a ratio of 1: 1, and the third layer of graphene consists of P atoms. The material single-layer BP2can become an electrode material with high specific capacity, low diffusion barrier and good structural stability, so that the development of the lithium / sodium ion battery is further promoted, and the electrode material has a good commercial application prospect.

Description

technical field [0001] The invention relates to a phosphorus-based cathode material for lithium batteries and an application thereof, which can be used in the technical field of lithium / sodium battery materials. Background technique [0002] The development and progress of human society cannot be separated from the development of energy. At present, the reserves of non-renewable resources such as petroleum that we rely on have become less and less. Not only that, but the gases such as carbon dioxide released after burning have also seriously affected the ecological environment of the earth. [0003] Solar energy is recognized as clean energy, it can not only solve the problem of environmental pollution to a certain extent, but also meet the needs of sustainable development. However, solar power generation is not perfect. The further development of solar power generation has been hindered by many factors such as sunlight, weather, low photovoltaic efficiency and insufficient...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/0525H01M10/054C01B25/08
CPCH01M4/5805H01M10/0525H01M10/054C01B25/084C01P2006/40H01M2004/021H01M2004/028Y02E60/10
Inventor 刘春生许洁
Owner NANJING UNIV OF POSTS & TELECOMM
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