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A kind of phosphorus-based cathode material for lithium battery and its application

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

Active Publication Date: 2022-07-26
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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  • A kind of phosphorus-based cathode material for lithium battery and its application
  • A kind of phosphorus-based cathode material for lithium battery and its application
  • A kind of phosphorus-based cathode material for lithium battery and its application

Examples

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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 cathode, LiPF 6 The ethylene carbonate solution is used as the electrolyte, and the graphite is used as the negative electrode of the battery system. Among them, graphite is abundant in nature and cheap, and carbonate-based solvents have better electrochemical stability and are one of the commonly used organic solvents in lithium-ion batteries. from BP 2 From the perspective of the theoretical specific capacity, diffusion barrier and electronic conductivity of the material, the overall 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 cathode, NaPF 6 The ethylene carbonate solution is used as the electrolyte, and the graphite is used as the negative electrode of the battery system. from BP 2 From the perspective of the ultra-low diffusion barrier of the material, electronic conductivity and good structural stability in the process of sodium deintercalation, the overall performance of this battery is good.

[0035] The present invention borrows the idea of ​​"Material Genome Project" to find a positive electrode material that can increase theoretical capacity, shorten charging and discharging time and has a stable structure. Through the first-principles computational simulation of a large number of phosphorus-based compounds, the lattice structure, electronic structure, ion transport, theoretical capacity and other properties were analyzed, and the two-dimensional monolayer BP was finally selected. 2 ...

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Abstract

The present invention discloses a phosphorus-based positive electrode material for lithium batteries and its application. The chemical formula of the phosphorus-based positive electrode material is represented by the following formula: BP 2 , where B is boron and P is phosphorus. the BP 2 It is a single-layer structure, including a three-layer graphene-like structure, which is a first-layer graphene-like structure, a second-layer graphene-like structure, and a third-layer graphene-like structure. The first layer of graphene and the second layer of graphene are both composed of B and P atoms in a ratio of 1:1, and the third layer of graphene is composed of P atoms. Single-layer BP of the material of the present invention 2 It can become an electrode material with high specific capacity, low diffusion barrier and good structural stability, which makes the development of lithium / sodium ion batteries further, and has good commercial application prospects.

Description

technical field [0001] The invention relates to a phosphorus-based positive electrode material for lithium batteries and its application, which can be used in the technical field of lithium / sodium battery materials. Background technique [0002] The development and progress of human society is inseparable from the development of energy. At present, the reserves of non-renewable resources such as oil that we rely on have become less and less, not only that, but also the carbon dioxide and other gases they emit 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, and the further development of solar power generation is hindered by many factors such as light, weather, low photovoltaic efficiency and insufficient sto...

Claims

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Application Information

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Patent Type & Authority Patents(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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