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Negative plate capable of being rapidly charged at low temperature, preparation method of negative plate and battery cell

A fast charging, negative electrode technology, applied in the direction of negative electrode, battery electrode, active material electrode, etc., can solve the problem of low temperature charging difficulty, and achieve the effect of maintaining stable charging and discharging performance, improving transmission speed, and avoiding risks.

Pending Publication Date: 2022-05-27
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem of difficulty in low-temperature charging of solid lithium batteries at present, and avoiding the risk of low-temperature lithium precipitation in the prior art, the present invention provides a fast-charging negative electrode sheet at low temperature, which has the advantage of stable and fast charging speed when used in batteries; Another object of the invention is to provide a method for preparing a negative electrode sheet for rapid charging at low temperature. The prepared negative electrode sheet is used in batteries, which has the advantage of stable and fast charging speed; Fast-charging negative electrode sheet The battery cell prepared by a negative electrode sheet prepared by a method for preparing a fast-charging negative electrode sheet at low temperature has the advantage of stable and fast charging speed

Method used

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  • Negative plate capable of being rapidly charged at low temperature, preparation method of negative plate and battery cell
  • Negative plate capable of being rapidly charged at low temperature, preparation method of negative plate and battery cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A fast-charging negative electrode piece at low temperatures, prepared by the following process:

[0040] Preparation of negative electrode pieces:

[0041] Step 1, the polydopamine-coated LTO particles and graphite (particle size 3μm) to the mass ratio of 0.333:1 mixing stirring, to obtain a mixed powder, add carbon black for the above mixed powder mass of 1.6%, mixing stirring, to obtain a conductive mixed powder, the two stirring speed is 600r / min, the time is 2h;

[0042] Step 2: Mix N-methylpyrrolidine with PVDF into a binder solution, the mass fraction of PVDF is 8%, the stirring speed is 600r / min, and the time is 1h;

[0043] Step 3: Mix the conductive mixed powder (particle size 3 μm) prepared in step 1 with the binder solution prepared in step 2, stir at a speed of 600r / min, and the time is 10h to obtain a negative electrode slurry;

[0044] Step 4: The negative electrode paste is coated on both sides of the copper foil, vacuum baked, the temperature is 90 °C, the ...

Embodiment 2

[0050] A fast-charging negative electrode piece at low temperatures, prepared by the following process:

[0051] Preparation of negative electrode pieces:

[0052] Step 1, the polydopamine-wrapped hard carbon with a capacity of 600mAh / g and silica particles (particle size 1μm) to the mass ratio of 0.05:1 mixing and stirring, to obtain a mixed powder, add graphene (particle size 1μm) for the above mixed powder mass of 1.2%, mixing stirring, to obtain conductive mixing powder, the two stirring speeds are 100r / min, time 1h;

[0053]Step 2: N-methylpyrrolidone is mixed with carboxymethyl chitosan into a binder solution, the mass fraction of carboxymethyl chitosan is 6%, the stirring speed is 100r / min, and the time is 30min;

[0054] Step 3, the conductive mixed powder prepared in step 1 and the binder solution prepared in step 2 are mixed and stirred at a speed of 200r / min and a time of 4h to obtain a negative electrode slurry;

[0055] Step 4: The negative electrode paste is coat...

Embodiment 3

[0061] A fast-charging negative electrode piece at low temperatures, prepared by the following process:

[0062] Preparation of negative electrode pieces:

[0063] Step 1, the polydopamine-coated TNO particles and silicon carbon alloy (particle size 1μm) with a mass ratio of 0.167:1 mixed stirring, to obtain a mixed powder, add carbon nanotubes (particle size 1μm) for the above mixed powder mass of 1.4%, mixing stirring, to obtain conductive mixing powder, the two stirring speeds are 350r / min, the time is 1.5h;

[0064]Step 2: N-methylpyrrolidone and cetyl modified coumadin gum are stirred and mixed into a binder solution, and the mass fraction of cetyl modified coumadin gum is 7%, the speed is 350r / min, and the time is 45min;

[0065] Step 3, the conductive mixed powder prepared in step 1 and the binder solution prepared in step 2 are mixed and stirred at a speed of 400r / min and a time of 7h to obtain a negative electrode slurry;

[0066] Step 4: The negative electrode slurry is...

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Abstract

The invention relates to the technical field of solid lithium batteries, and discloses a negative plate capable of being quickly charged at low temperature and a preparation method thereof. The invention relates to a negative plate capable of being rapidly charged at a low temperature, which is characterized in that two sides of a negative current collector are coated with negative slurry formed by mixing high lithium intercalation potential particles, negative active particles, a conductive agent, a binder and a binder solvent, the negative plate is obtained by pressing, and the initial lithium intercalation potential of the high lithium intercalation particles is 1.0-1.6 V. The high-lithium-intercalation-potential particles are added to wrap the outer surfaces of the negative active particles, the low-temperature lithium intercalation speed is high, the conductivity of the negative plate can be effectively enhanced, excessive lithium precipitation in the charging and discharging process of the solid lithium battery at the low temperature is prevented, and the long cycle life is kept. When being used for a solid lithium battery, the negative plate capable of being rapidly charged at low temperature has the advantages of less lithium precipitation at low temperature, no electrolyte solidification, good stability at high temperature, stable and rapid charging speed and long cycle life.

Description

Technical field [0001] The present invention relates to the field of solid lithium battery technology, in particular to a negative electrode sheet that is quickly charged at low temperature and a preparation method thereof, a battery cell. Background [0002] Solid lithium battery for its safety and high energy density and much attention by the market, solid lithium battery charging performance to maintain rapid stability, can enhance the competitiveness in the market, but in the vast northern region of China in the winter low temperature up to -5 ~ -40 °C, extreme weather, the charging performance of many solid lithium batteries have an adverse impact: solid lithium battery system in the negative electrode material is mainly graphite-based, in the lower temperature application scenario (≤ -20 °C), there is a large charge transfer resistance makes lithium-ion battery low-temperature charging difficult, At present, the solution to this kind of problem is to add low-temperature add...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/36H01M4/485H01M4/62H01M4/139H01M10/052
CPCH01M4/13H01M4/366H01M4/485H01M4/624H01M4/625H01M4/622H01M4/628H01M4/139H01M10/052H01M2004/021H01M2004/027Y02P70/50Y02E60/10
Inventor 何春峰苏文俊李凡群韩笑商殷兴
Owner WANXIANG 123 CO LTD
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