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Safe modified graphite and preparation method thereof

A safe and graphite technology, applied in graphite, electrical components, battery electrodes, etc., can solve the problem that graphite cannot meet the high and low temperature performance and excellent performance at the same time, and achieve the effect of good safety and cycle stability

Inactive Publication Date: 2020-07-07
RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As long as the prepared material meets high temperature cycle stability, it does not need to consider low temperature and normal temperature performance, which solves the problem that graphite cannot meet high and low temperature performance at the same time

Method used

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  • Safe modified graphite and preparation method thereof
  • Safe modified graphite and preparation method thereof
  • Safe modified graphite and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1) Preparation of NTC-coated graphite precursor at room temperature:

[0038] a, take 5.1mmol Ni(CH 3 COO) 3 4H 2 O, 13.8mmol Mn(CH 3 COO) 2 4H 2 O, 2.2mmol Cu(CH 3 COO) 2 ·H 2 O and 0.7mmolZn(CH 3 COO) 2 4H 2 O was added to 50g deionized water, stirred for 1h, and configured as a mixed solution of NTC raw materials at normal temperature for subsequent use;

[0039] b. Add 95 g of artificial graphite with a particle size D50 of 20 μm into 500 g of absolute ethanol, ultrasonicate for 2 hours, and configure it into an absolute ethanol dispersion of graphite for later use;

[0040] c. Pour the mixed solution of NTC raw materials at normal temperature into the dispersion of graphite in anhydrous ethanol, and stir for 1 hour to obtain a mixed dispersion.

[0041] d. Use a spray dryer to coat and disperse the coated powder to obtain Ni 0.7 mn 1.9 Cu 0.3 Zn0.1 o 4 Precursor for coated graphite.

[0042] 2) Preparation of graphite negative electrode material: ...

Embodiment 2

[0046] 1) Preparation of NTC-coated graphite precursor at room temperature:

[0047] a, take 5.1mmol Ni(CH 3 COO) 3 4H 2 O, 13.8mmol Mn(CH 3 COO) 2 4H 2 O, 2.2mmol Cu(CH 3 COO) 2 ·H 2 O and 0.7Cr(CH 3 COO) 3 ·3H 2 O was added to 50g deionized water, stirred for 1h, and configured as a mixed solution of NTC raw materials at normal temperature for subsequent use;

[0048] b. Add 95 g of natural graphite with a particle size D50 of 25 μm into 500 g of absolute ethanol, ultrasonicate for 4 hours, and configure it into an absolute ethanol dispersion of graphite for later use;

[0049] c. Pour the mixed solution of NTC raw materials at normal temperature into the dispersion of graphite in absolute ethanol, and stir for 15 hours to obtain a mixed dispersion.

[0050] d. Use a spray dryer to coat and disperse the coated powder to obtain Ni 0.7 mn 1.9 Cu 0.3 Cr 0.1 o 4 Graphite-coated precursor.

[0051] 2) Preparation of graphite negative electrode material:

[0052...

Embodiment 3

[0055] 1) Preparation of NTC-coated graphite precursor at room temperature:

[0056] a, take 5.1mmol Ni(CH 3 COO) 3 4H 2 O, 13.8mmol Mn(CH 3 COO) 2 4H 2 O, 2.2mmol Cu(CH 3 COO) 2 ·H 2 O and 0.7Cr(CH 3 COO) 3 ·3H 2 O was added to 50g deionized water, stirred for 1h, and configured as a mixed solution of NTC raw materials at normal temperature for subsequent use;

[0057] b. Add 95 g of mesocarbon microspheres with a particle size D50 of 15 μm into 500 g of absolute ethanol, ultrasonicate for 0.5 h, and configure it into an absolute ethanol dispersion of graphite for later use;

[0058] c. Pour the mixed liquid of NTC raw materials at normal temperature into the dispersion liquid of graphite in anhydrous ethanol, and stir for 10 hours to obtain a mixed dispersion liquid.

[0059] d. Use a spray dryer to coat and disperse the coated powder to obtain Ni 0.7 mn 1.9 Cu 0.3 Cr 0.1 o 4 Precursor for coated graphite.

[0060] 2) Preparation of graphite negative electr...

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Abstract

The invention discloses safe modified graphite, which is characterized in that the graphite is a graphite negative electrode material coated by NTC at normal temperature and belongs to the field of lithium battery negative electrode materials. The preparation method comprises the steps of firstly, mixing a mixed solution of a normal-temperature NTC raw material containing Zn, Cd, Ga, In, Mn, Fe, Mg, Cu, Co, Ti, Ni, Cr, Si or Be elements with a dispersion solution of graphite, and then coating through spray drying and scattering procedures to form a precursor of normal-temperature NTC materialcoated graphite; placing the precursor in an atmosphere furnace for high-temperature calcination; and finally, mixing, sieving and demagnetizing to obtain the NTC-coated graphite negative electrode material. According to the method disclosed by the invention, the characteristics of high resistivity at normal temperature and low resistivity at high temperature of the normal-temperature NTC materialare utilized, so that the prepared graphite is relatively low in activity at a low temperature or normal temperature and shows normal activity at a high temperature. If the graphite negative electrode material is used in a battery with a heating function, low-temperature and normal-temperature low activity can be achieved, the graphite negative electrode material shows normal activity when the battery is heated, and meanwhile, the graphite negative electrode material has better safety and cycling stability than conventional graphite at a high temperature.

Description

technical field [0001] The invention relates to the field of negative electrode materials for lithium ion batteries, in particular to a safe modified graphite and a preparation method thereof. Background technique [0002] In recent years, with the inclination of national policies, electric vehicles have become more and more popular, which has led to the rapid development of power lithium batteries. Graphite is currently the most mainstream anode material for lithium-ion batteries, but it is difficult for graphite anode materials for lithium-ion batteries to ensure excellent low-temperature performance while having excellent high-temperature performance, so it is difficult to meet all climatic conditions at the same time. At present, there is no good solution to the problem that graphite cannot satisfy the high and low temperature performance at the same time. [0003] NTC materials refer to materials whose resistance decreases exponentially with temperature rise. NTC mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62C01B32/21
CPCC01B32/21H01M4/625Y02E60/10
Inventor 刘建红高亚伦王兴勤吴宁宁王慧
Owner RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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