Battery and method for testing remaining active lithium capacity in negative electrode piece after battery discharging

A technology of negative pole piece and residual activity, which is applied in the field of testing the battery and the residual active lithium capacity in the negative pole piece after the battery is discharged, can solve problems such as limited effect, and achieve the effect of high degree of accuracy and simple test method.

Active Publication Date: 2019-09-06
CONTEMPORARY AMPEREX TECH CO
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

These methods are all considered from the perspective of inhibiting the side reaction of the negative electrode caused by the dissolution-repair balance of the SEI film, and delay the reduction of active lithium ions by throttling. Therefore, the role they can play is limited, and the cycle life of lithium-ion secondary batteries is the highest. It can achieve about 5,000 to 6,000 cycles, which is still far behind the goal of long-life electric buses and large-scale energy storage systems with a cycle life of more than 10,000 cycles

Method used

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  • Battery and method for testing remaining active lithium capacity in negative electrode piece after battery discharging
  • Battery and method for testing remaining active lithium capacity in negative electrode piece after battery discharging
  • Battery and method for testing remaining active lithium capacity in negative electrode piece after battery discharging

Examples

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preparation example Construction

[0068] (1) Preparation of positive pole piece

[0069] Mix the positive electrode active material lithium iron phosphate (the reversible gram capacity is 139mAh / g), the conductive agent acetylene black, and the binder PVDF at a weight ratio of 94:4:2, add the solvent N-methylpyrrolidone, stir and mix evenly to obtain The positive electrode slurry is then coated on both surfaces of the positive electrode current collector aluminum foil, then dried and cold pressed to obtain the positive electrode sheet.

[0070] (2) Preparation of negative pole piece

[0071] Mix the artificial graphite (reversible gram capacity of 340mAh / g) as the negative electrode active material, the conductive agent acetylene black, and the binder SBR+CMC according to the weight ratio of 95:1.5:3.1:0.4, add the solvent deionized water, fully stir and mix evenly Obtain negative electrode slurry, be coated on the two surfaces of negative electrode current collector copper foil then, after drying, cold press...

Embodiment 1

[0079] Battery S1 was prepared by the above method, wherein the coating weight of the negative electrode slurry was 0.120g / 1540.25mm 2 (Based on the weight not including the solvent), the coating weight of the positive electrode slurry is 0.198g / 1540.25mm 2 (Based on the weight without solvent), the weight of lithium sheet is 3.05mg / 1540.25mm 2 .

[0080] Unit area (take the area as 1540.25mm 2 Calculated, the following examples are similar) negative electrode active material capacity=negative electrode coating weight per unit area×negative electrode active material weight ratio×reversible gram capacity of negative electrode active material=0.120g×95%×340mAh / g=38.76mAh.

[0081] Unit area (take the area as 1540.25mm 2 Calculated, the following examples are similar) positive electrode active material capacity=positive electrode coating weight per unit area×positive electrode active material weight ratio×reversible gram capacity of positive electrode active material=0.198g×94...

Embodiment 2

[0083] Battery S2 was prepared by the above method, wherein the coating weight of the negative electrode slurry was 0.136g / 1540.25mm 2 , the coating weight of positive electrode slurry is 0.198g / 1540.25mm 2 , the weight of the lithium sheet on the surface of the negative electrode diaphragm is 3.05mg / 1540.25mm 2 .

[0084] Negative electrode active material capacity per unit area=0.136g×95%×340mAh / g=43.93mAh.

[0085] Positive active material capacity per unit area = 0.198g x 94% x 139mAh / g = 25.87mAh.

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Abstract

The present invention provides a battery and a method for testing the remaining active lithium capacity in a negative electrode piece after battery discharging. The testing method can obtain the remaining active lithium content in the negative electrode piece of the battery, perform quantitative analysis on a lithium compensation amount of the battery, and further can preparatorily determine an actual lithium compensation degree of the battery, avoiding affecting the subsequent use of the battery due to insufficient lithium compensation or excessive lithium compensation of the negative electrode piece in the battery preparation process. Furthermore, the testing method is simple and has a high degree of accuracy.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a battery and a method for testing the remaining active lithium capacity in negative pole pieces after the battery is discharged. Background technique [0002] Among secondary batteries, compared with other types of secondary batteries, lithium-ion secondary batteries occupy a mainstream position in the market due to their higher energy density advantages. Among them, lithium-ion secondary batteries with lithium iron phosphate as the positive electrode active material are widely used in electric bus power systems due to their high safety, low cost, and long life, and have broad application prospects in the field of large-scale energy storage. [0003] In recent years, based on the cost of electricity, the requirements for the life of lithium-ion secondary batteries have become higher and higher. Although lithium iron phosphate has high structural stability, the dissolution-repair balanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/388G01R31/378H01M10/0525H01M10/058
CPCH01M10/0525H01M10/058G01R31/388G01R31/378H01M4/139G01R31/36Y02E60/10Y02P70/50
Inventor 杨龙飞王国宝刘江杜国栋刘晓梅
Owner CONTEMPORARY AMPEREX TECH CO
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