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Nano lithium iron silicate/graphene anode material for lithium battery and preparation method thereof

A lithium iron silicate, cathode material technology, applied in battery electrodes, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problems of low capacity, collapse of material structure, incomplete lithium ion deintercalation, etc. Achieve stable performance, reduce modification costs, improve discharge rate and cycle stability

Active Publication Date: 2018-06-05
东营市广利临港产业园有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problems of incomplete deintercalation of lithium ions, low capacity, and material structure collapse after deep deintercalation of lithium iron silicate materials, the present invention proposes a nano-lithium iron silicate / graphene positive electrode material for lithium batteries and a preparation method thereof to solve It solves the problems of incomplete lithium ion deintercalation, low capacity, and material structure collapse after deep deintercalation of traditional lithium iron silicate materials, and further improves the mobility of lithium ions inside the positive electrode material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Weigh 3 parts of graphene oxide, 17 parts of iron oxalate pentahydrate, 25 parts of lithium silicate, 45 parts of ammonia water with an ammonia gas volume concentration of 25%, and 2 parts of ethylene glycol in parts by mass;

[0036] (2) Mix the graphene oxide, ethylene glycol and ammonia water to form a solution A, and control the stirring rate to 200rpm by mechanical stirring so that the graphene oxide is uniformly dispersed in the ammonia water, and then add the ferric oxalate pentahydrate into the In the mixed solution of water ethanol and deionized water, the mass ratio of ethanol and deionized water in the mixed solution of absolute ethanol and deionized water is 0.8:1, after stirring and dissolving, solution B is obtained;

[0037] (3) During the rapid stirring of solution B, pour solution A and lithium silicate to obtain mixed solution C;

[0038] (4) Pour the mixed solution C into a ball mill, use wet ball milling to control the ball milling speed at 2000rpm...

Embodiment 2

[0042] (1) Weigh 9 parts of graphene oxide, 25 parts of iron oxalate pentahydrate, 25 parts of lithium silicate, 42 parts of ammonia water with an ammonia gas volume concentration of 25%, and 1 part of PVA and PVP mixture according to the parts by mass;

[0043] (2) Mix the graphene oxide, PVA, PVP mixture and ammonia water to form a solution A. By mechanical stirring, the stirring rate is controlled to 140rpm so that the graphene oxide is uniformly dispersed in the ammonia water, and then the ferric oxalate pentahydrate Add in the mixed solution of absolute ethanol and deionized water, the mass ratio of ethanol and deionized water in the mixed solution of absolute ethanol and deionized water is 1.4:1, after stirring and dissolving, solution B is obtained;

[0044] (3) During the rapid stirring of solution B, pour solution A and lithium silicate to obtain mixed solution C;

[0045] (4) Pour the mixed solution C into a ball mill, use wet ball milling to control the ball milling...

Embodiment 3

[0049] (1) Weigh 8 parts of graphene oxide, 20 parts of iron oxalate pentahydrate, 22 parts of lithium silicate, 55 parts of ammonia water with an ammonia gas volume concentration of 25%, and 0.5 parts of polyethylene glycol in parts by mass;

[0050] (2) Mix the graphene oxide, polyethylene glycol and ammonia water to form a solution A, and control the stirring rate to 120rpm by mechanical stirring so that the graphene oxide is uniformly dispersed in the ammonia water, and then add the ferric oxalate pentahydrate In the mixed solution of absolute ethanol and deionized water, the mass ratio of ethanol to deionized water in the mixed solution of absolute ethanol and deionized water is 1.1:1, after stirring and dissolving, solution B is obtained;

[0051] (3) During the rapid stirring of solution B, pour solution A and lithium silicate to obtain mixed solution C;

[0052] (4) Pour the mixed solution C into a ball mill, use wet ball milling to control the ball milling speed to 20...

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Abstract

The invention provides a nano lithium iron silicate / graphene anode material for a lithium battery and a preparation method thereof. The preparation method comprises the following steps: mixing graphene oxide, ferric oxalate, lithium silicate and ammonia water; adding a dispersant for wet process ball-milling; and then carrying out thermal treatment to obtain nitrogen-doped lithium iron silicate / graphene. By performing replaced doping on graphene and lithium iron silicate through nitrogen atoms to replace carbon atoms in graphene and oxygen atoms in lithium iron silicate, the de-embedding potential barrier of lithium ions is reduced, and meanwhile, nitrogen atoms are introduced to form N-suspended keys in graphene, and the suspended keys after deep de-embedding of lithium ions and anions form weak covalent bond joint, so that the structural integrity of the anode material is kept. The method provided by the invention solves the problems that lithium ions of a conventional lithium iron silicate material are incompletely de-embedded, the capacity is low and the structure of the material after deep de-embedding collapses, the migration rate of lithium ions in the anode material is increased, and the discharge rate and the cycling stability of the battery are improved.

Description

technical field [0001] The invention relates to the field of lithium ion battery materials, in particular to a nano-lithium iron silicate / graphene cathode material for lithium batteries and a preparation method thereof. Background technique [0002] With the process of economic globalization and the increasing demand for energy, finding new energy storage devices has become a hot spot in the field of new energy. Lithium-ion battery (Li-ion, Lithium Ion Battery): It is a secondary battery (rechargeable battery), which mainly relies on lithium ions to move between the positive and negative electrodes to work. During the charging and discharging process, Li+ intercalates and deintercalates back and forth between the two electrodes: when charging, Li+ is deintercalated from the positive electrode, intercalated into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. Compared with nickel-ca...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/362H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 陈庆廖健淞
Owner 东营市广利临港产业园有限公司
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