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Coated graphite lithium ion battery negative electrode material and preparation method thereof

A technology of lithium ion battery and negative electrode material, applied in battery electrodes, batteries, secondary batteries, etc., can solve the problems of poor capacity retention rate and high working voltage of the whole battery, suppress the diffusion of oxygen vacancies, improve discharge capacity, reduce The effect of electrochemical internal resistance

Active Publication Date: 2018-07-20
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The assembled full battery with manganese-based materials paired with graphite has high operating voltage but poor capacity retention

Method used

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  • Coated graphite lithium ion battery negative electrode material and preparation method thereof
  • Coated graphite lithium ion battery negative electrode material and preparation method thereof
  • Coated graphite lithium ion battery negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: the preparation method of coated graphite lithium ion battery negative electrode material

[0035] Include the following steps:

[0036] (1) Pretreatment of graphite: disperse 0.6g artificial graphite in 100ml deionized water (the concentration of graphite dispersed in deionized water is 6g / L), add cationic surfactant cetyltrimethylammonium bromide ( CTAB) 0.02g, ultrasonic dispersion 30min obtains the dilute suspension of graphite;

[0037] (2) Precursor solution Al(OH) 3 Preparation: At a temperature of 20°C, 0.02g Al(NO 3 ) 3 9H 2 O dissolved in deionized water, and 0.2mol / L NH 3 ·H 2 The O solution was added dropwise into the three-necked flask at the same time, and by constant Al(NO 3 ) 3 9H 2The titration rate of the O solution is used to adjust the titration rate of the ammonia solution so as to regulate pH=7 (the rate of titration cannot be too fast to avoid the Al(OH) generated) 3 get together). The suspension was then aged for an addit...

Embodiment 2

[0047] Embodiment 2: the preparation method of coated graphite lithium ion battery negative electrode material

[0048] Include the following steps:

[0049] (1) Pretreatment of graphite: disperse 1g of artificial graphite in 100ml deionized water (the concentration of graphite dispersed in deionized water is 10g / L), add cationic surfactant dodecyl dimethyl benzyl ammonium chloride (1227) 0.05g, ultrasonic dispersion 30min obtains the dilute suspension of graphite;

[0050] (2) Precursor solution Al(OH) 3 Preparation: Dissolve 0.006833g aluminum sulfate octadecahydrate in deionized water at a temperature of 70°C, and 0.2mol / L NH 3 ·H 2 O solution is added dropwise in the there-necked flask simultaneously, adjusts the titration rate of ammonia solution so as to regulate pH=7 (the rate of addition can not be too fast, to avoid the Al(OH) of generation by the titration rate of constant aluminum sulfate solution 3 get together). The suspension was then aged for an additional ...

Embodiment 3

[0054] Embodiment 3: With reference to Example 2, the difference is that the quality of the cationic surfactant dodecyldimethylbenzyl ammonium chloride (1227) is 0.0009g.

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Abstract

The invention discloses a coated graphite lithium ion battery negative electrode material and a preparation method thereof. A coating reaction is effectively controlled under a surfactant adding condition through a precipitation conversion technology. The surface of graphite is coated with a nano-scale uniform and dense aluminum phosphate coating, and the mass of the aluminum phosphate coating is0.1-10% of the mass of the graphite. The aluminum phosphate protectiib layer can avoid direct contact between an electrolyte and the graphite, and also prevents dissolved manganese ions from being reduced into metallic manganese on the surface of the graphite. The coating can improve the cycle stability of a manganese-based positive electrode material / graphite matched total battery and improve theelectrochemical performances of the total battery.

Description

Technical field: [0001] The invention relates to a lithium ion battery, in particular to a coated graphite lithium ion battery negative electrode material and a preparation method thereof. Background technique: [0002] Over the past ten years, various types of electric vehicles have occupied an increasing proportion of the market, including hybrid electric vehicles (PHEV) and pure electric vehicles (EV). Lithium-ion batteries are an important enabler in electrifying vehicles due to their high energy density and high power. Commercial lithium-ion batteries (LIBs) use graphite-based carbon anode materials, which have a low charge-discharge platform, but the theoretical specific capacity is only 372mAh / g, which limits the development of lithium-ion batteries. Since the first reported discovery, the high-voltage spinel-type oxide LiNi 0.5 mn 1.5 o 4 (LNMO) has become an attractive choice for the cathode of next-generation Li-ion batteries due to its high operating voltage (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/583H01M4/62H01M4/628H01M10/0525H01M2220/20Y02E60/10
Inventor 吕东生曾环娜陈志祥方丹扬何佳
Owner SOUTH CHINA NORMAL UNIVERSITY
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