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Doped porous graphene and organic lithium salt composite lithium supplement material and its preparation method and application

A technology of porous graphene and organic lithium, which is applied in graphene, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as high decomposition potential, affect battery life, produce oxygen and other by-products, and reduce decomposition potential, Good battery cycle performance and high lithium replenishment capacity

Active Publication Date: 2022-08-02
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the decomposition potential of the organic lithium salt is relatively high, and oxygen and other by-products are produced during the decomposition process, which affects the battery life.

Method used

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  • Doped porous graphene and organic lithium salt composite lithium supplement material and its preparation method and application
  • Doped porous graphene and organic lithium salt composite lithium supplement material and its preparation method and application
  • Doped porous graphene and organic lithium salt composite lithium supplement material and its preparation method and application

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preparation example Construction

[0021] The present invention also provides a preparation method of a composite lithium ion battery positive electrode lithium supplement material containing doped porous graphene and organic lithium salt, characterized in that the method comprises:

[0022] The doped porous graphene is dissolved in an organic lithium salt aqueous solution, and then recrystallized in an ethanol solution to obtain a composite lithium supplement material containing the doped porous graphene and the organic lithium salt,

[0023] Wherein, the doping atoms in the doped porous graphene are one or more of N atoms, B atoms, S atoms, N atoms, F atoms, Fe atoms, Cu atoms, Co atoms, Ni atoms and Zn atoms kind.

[0024] Wherein, the doped porous graphene in the present invention can be prepared by using an existing method. For example, the graphene material is calcined at high temperature in an air atmosphere in a tube furnace to obtain porous graphene; the porous graphene and doped precursor are sintere...

Embodiment 1

[0032] This example is used to illustrate the composite lithium supplement material provided by the present invention.

[0033](1) Preparation and detection of doped porous graphene

[0034] An appropriate amount of graphene material was placed in a crucible, heated at a heating rate of 5 °C / min to 430 °C in an air atmosphere in a tube furnace, and kept for 3 h. After the temperature of the tube furnace was lowered to room temperature, porous graphene was obtained. The above-mentioned certain amount of porous graphene and perboric acid (H 3 BO 4 ) were placed in two different alumina crucibles, in which the mass ratio of porous graphene and perborate phosphoric acid was 1:10, placed in a tube furnace at the same time, and calcined at 900 °C for 1 h under an argon atmosphere , the heating rate was 5 °C / min, and then the calcination was continued for 1 h in an ammonia atmosphere. The product was repeatedly washed with 0.1 M NaOH solution and deionized water to remove residual...

Embodiment 2

[0045] This example is used to illustrate the composite lithium supplement material provided by the present invention.

[0046] (1) Preparation and detection of doped porous graphene

[0047] Using the same method as Example 1, B-N co-doped porous graphene was prepared and detected.

[0048] (2) Preparation of composite lithium-replenishing materials

[0049] Using the same method as in Example 1, except that the mass of the B-N co-doped porous graphene is 20% of that of lithium oxalate, a composite lithium-replenishing material A2 is prepared.

[0050] (3) Preparation of positive electrode

[0051] The preparation method of the electrode sheet S2 for verifying the voltage and capacity of lithium supplementation and the electrode sheet B2 for verifying the implementation effect of the lithium supplementing material in the full battery in Example 2 is the same as that in Example 1.

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Abstract

The present invention provides a composite lithium-ion battery positive electrode lithium supplement material containing doped porous graphene and organic lithium salt, characterized in that the doped porous graphene is used as a catalyst, and the doped porous graphene The heteroatom is one or more of N atom, B atom, S atom, N atom, F atom, Fe atom, Cu atom, Co atom, Ni atom and Zn atom. The composite lithium-replenishing material provided by the present invention uses doped porous graphene as a catalyst and is applied in a lithium-ion battery system, which can reduce the decomposition potential of the lithium-replenishing additive organic lithium salt, have higher lithium-replenishing capacity and better battery cycle performance .

Description

technical field [0001] The invention relates to a composite lithium ion battery positive electrode lithium supplement material containing doped porous graphene and organic lithium salt, a preparation method thereof, and its application in the preparation of lithium ion batteries. Background technique [0002] As a high-efficiency electric energy-chemical energy conversion device, lithium-ion energy storage devices, especially lithium secondary batteries, have been widely used in electric vehicles, large-scale energy storage and other fields. However, during the first cycle of lithium-ion energy storage devices, the solid electrolyte interface (SEI) is formed on the surface of the negative electrode, resulting in irreversible lithium loss, resulting in a decrease in the energy density and cycle life of lithium-ion batteries; new high-capacity alloy negative electrode materials, The first coulombic efficiency is low (<90%), resulting in a large capacity loss in the first we...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/525H01M10/0525C01B32/194B01J27/24B01J21/18B01J35/10B01J23/745B01J23/72
CPCH01M4/62H01M4/525H01M10/0525C01B32/194B01J27/24B01J21/18B01J23/745B01J23/72C01B2204/32B01J35/33B01J35/60Y02E60/10
Inventor 谢佳张薇李思吾钟伟
Owner HUAZHONG UNIV OF SCI & TECH
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