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Application of aromatic hyperconjugation dicarboxylate and aromatic hyperconjugation dicarboxylate/graphene composite material

A technology of hyperconjugated dicarboxylate and composite materials, applied in the field of negative electrode materials, can solve problems such as worrying rate performance, achieve high rate performance, solve resource shortage, and good electrochemical performance.

Active Publication Date: 2017-10-20
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

At present, the commonly used organic anode materials for potassium ion batteries are mainly aromatic dicarboxylates, but their rate performance is worrying.

Method used

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  • Application of aromatic hyperconjugation dicarboxylate and aromatic hyperconjugation dicarboxylate/graphene composite material
  • Application of aromatic hyperconjugation dicarboxylate and aromatic hyperconjugation dicarboxylate/graphene composite material
  • Application of aromatic hyperconjugation dicarboxylate and aromatic hyperconjugation dicarboxylate/graphene composite material

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Embodiment

[0092] 1. Use of aromatic hyperconjugated dicarboxylates as negative electrode materials for potassium ion batteries

[0093] In order to illustrate the redox principle of aromatic hyperconjugated dicarboxylates in potassium ion batteries, the present invention uses 4,4' biphenyl dicarboxylates (R 2 BPDC) and 4,4'stilbene dicarboxylate (R 2 SBDC) as an example to illustrate its principle.

[0094] Such as Figure 1-15b shown. Specifically, as figure 1 Shown, 4,4' biphenyl dicarboxylate (R 2 BPDC) and 4,4'stilbene dicarboxylate (R 2 SBDC) can change between the oxidation state and the reduction state by gaining and losing 2mol electrons. Because it has a large conjugated surface and a strong ability to disperse charges, it has strong stability. According to the chemical valence bond Conjugation theory, the larger the conjugate surface, the easier it is to disperse the charge, which is beneficial to improve stability; however, as the conjugate surface increases, the steric...

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Abstract

The invention relates to the technical field of negative materials of potassium-ion batteries and aims at solving the technical problems of poor rate performance and cycling stability of the potassium ion battery in the prior art. The invention provides an application of aromatic hyperconjugation dicarboxylate and aromatic hyperconjugation dicarboxylate / graphene composite materials. The aromatic hyperconjugation dicarboxylate and aromatic hyperconjugation dicarboxylate-graphene composite materials comprise 4, 4'-biphenyldicarboxylic acid salt, 4, 4'-diphenylethene dicarboxylate, 4, 4'-biphenyl potassium diformate / graphene composite material (K2BPDC@GR) and 4, 4'-diphenylethylene potassium dicarboxylate / graphene composite material (K2SBDC@GR). As a new family of the negative materials of the potassium-ion batteries, the aromatic hyperconjugation dicarboxylate and aromatic hyperconjugation dicarboxylate-graphene composite materialsshow a reversible disembedding potassium-ion platform, and the hyperconjugation dicarboxylate has larger pi conjugation three-dimensional space and faster potassium-ion and electron transmission channel, has high theoretical specific capacity and can realize high rate performance.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for potassium ion batteries, in particular to the application of aromatic hyperconjugated dicarboxylates and graphene composite materials thereof. Background technique [0002] Energy is the material basis of human production and life, and is closely related to human civilization and technological progress. With the continuous development of human civilization and world economy, human beings are currently facing the dual challenges of resource depletion and deteriorating living environment. In recent years, traditional fossil energy has caused huge pollution to the environment, and energy and environmental problems have become prominent problems hindering human survival and development. It is of great significance to adjust and optimize the energy structure and develop new energy sources that can be recycled and have no pollution to the environment. Currently available new e...

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Application Information

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IPC IPC(8): H01M4/36H01M4/587H01M4/60H01M10/054
CPCH01M4/364H01M4/587H01M4/60H01M10/054Y02E60/10
Inventor 李晶泽李超邓七九樊聪王志红
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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