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Method for testing mass ratio capacity of lithium battery material

A technology of mass ratio and capacity, applied in the measurement of electrical variables, measurement of electricity, measurement devices, etc., can solve the problems of cycle failure, gram capacity deviation, etc.

Inactive Publication Date: 2019-02-22
SHANDONG GOLDENCELL ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a method for testing the mass specific capacity of lithium battery materials, to explore the influence of the mass ratio of positive and negative electrodes, the processing technology of the pole piece, and the matching of positive and negative electrodes on the performance of the gram capacity of the positive electrode material, in order to improve the mass ratio of the battery The capacity provides appropriate process parameters, which solves the problems of safety and cycle failure that may be caused by the deviation between the deduction capacity and the full battery capacity.

Method used

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  • Method for testing mass ratio capacity of lithium battery material
  • Method for testing mass ratio capacity of lithium battery material

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specific Embodiment 1

[0034] (1) Production of positive pole piece: Nickel-cobalt-aluminum ternary material (NCA) is used as the positive electrode material, according to the nickel-cobalt-aluminum ternary material (NCA): acetylene black: polyvinylidene fluoride (PVDF) = 92:5:3 , respectively weighed 15.0030g of nickel-cobalt-aluminum ternary material (NCA), 0.8154g of acetylene black, and 9.7846g of 5% polyvinylidene fluoride (PVDF) in a 50mL beaker, and added an appropriate amount of N-methylpyrrolidone (NMP) to adjust The solid content is 55%, stirred for 4 hours, evenly coated on aluminum foil, the coating thickness is 150um, vacuum dried at 120°C, and N-methylpyrrolidone (NMP) is removed to obtain the positive electrode sheet;

[0035] (2) Production of negative pole piece: take nano-lithium titanate as the negative electrode material, according to nano-lithium titanate: acetylene black: polyvinylidene fluoride (PVDF) = 92:5:3, weigh 15.0030g nano-lithium titanate respectively , 0.8154g acetyl...

specific Embodiment 2

[0045] (1) Production of positive pole piece: Nickel-cobalt-aluminum ternary material (NCA) is used as the positive electrode material, according to the nickel-cobalt-aluminum ternary material (NCA): acetylene black: polyvinylidene fluoride (PVDF) = 92:5:3 , respectively weighed 15.0030g of nickel-cobalt-aluminum ternary material (NCA), 0.8154g of acetylene black, and 9.7846g of 5% polyvinylidene fluoride (PVDF) in a 50mL beaker, and added an appropriate amount of N-methylpyrrolidone (NMP) to adjust The solid content is 55%, stirred for 4 hours, evenly coated on aluminum foil, the coating thickness is 150um, vacuum dried at 120°C, and N-methylpyrrolidone (NMP) is removed to obtain the positive electrode sheet;

[0046] (2) Production of negative pole piece: take nano-lithium titanate as the negative electrode material, according to nano-lithium titanate: acetylene black: polyvinylidene fluoride (PVDF) = 95:3:2, weigh 15.0030g nano-lithium titanate respectively , 0.4738g acetyl...

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Abstract

The invention, which belongs to the field of lithium ion battery production process, provides a method for testing the mass ratio capacity of a lithium battery material so that a problem of a detection difference of a total battery gram volume and a button battery gram volume can be solved and thus the safety performance of the total battery can be improved. The method comprises the following steps that: a positive electrode piece is made; a negative electrode piece is made; die punching and weighing are carried out, wherein masses of positive and negative pieces are selected based on positiveand negative electrode material types and corresponding pairing is carried out and then the positive and negative pieces are placed in a glove box for two hours; button electricity assembling of theglove box is carried out; the made button battery is clamped at an electrochemical testing cabinet and charge and discharge currents are calculated according to testing multiplying powers (0.2C, 1C, 3C, 5C) based on a formula: current=multiplying power* theoretical gram volume*(M2-M1)*omega%.

Description

technical field [0001] The invention belongs to the field of lithium ion battery production technology, in particular to a method for testing the mass specific capacity of lithium battery materials. Background technique [0002] Lithium-ion batteries have been widely used due to their small size, light weight, environmental friendliness, and high specific energy. With the development of electronic products, electric vehicles and various hybrid vehicles, higher requirements are placed on the lithium-ion batteries that provide energy for them. [0003] Lithium-ion batteries generally include a positive electrode sheet, a negative electrode sheet, a separator, and an electrolyte. Among them, during the charging and discharging process, lithium ions move back and forth between the positive and negative electrodes. When charging, lithium ions are deintercalated from the positive electrode and inserted into the negative electrode through the electrolyte. The negative electrode is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/385G01R31/378
Inventor 李晓洁孟博
Owner SHANDONG GOLDENCELL ELECTRONICS TECH
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