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Negative electrode for non-aqueous electrolyte secondary battery, and non-aqueous electrolyte secondary battery

A non-aqueous electrolyte and secondary battery technology, which is applied to non-aqueous electrolyte battery electrodes, non-aqueous electrolyte batteries, non-aqueous electrolytes, etc. sexual effect

Pending Publication Date: 2020-05-01
PANASONIC HLDG CORP KADOMA SHI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially in low temperature environment, the battery resistance tends to rise

Method used

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  • Negative electrode for non-aqueous electrolyte secondary battery, and non-aqueous electrolyte secondary battery
  • Negative electrode for non-aqueous electrolyte secondary battery, and non-aqueous electrolyte secondary battery
  • Negative electrode for non-aqueous electrolyte secondary battery, and non-aqueous electrolyte secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0094] The present disclosure will be further described below through examples, but the present disclosure is not limited to these examples.

Synthetic example 1

[0096]170 g of ion-exchanged water was poured into a reaction container equipped with a stirrer, a reflux tube, a dropping funnel, a thermometer, and a nitrogen gas introduction tube, and the temperature was raised to 70° C. while stirring under a nitrogen gas flow. Then, an aqueous solution obtained by dissolving 0.5 g of ammonium persulfate in 5 g of ion-exchanged water was added. 37 g of methyl methacrylate, 60 g of n-butyl acrylate, and 3 g of acrylic acid were put into the dropping funnel, and were dropped into the reaction vessel at a constant rate over 3 hours. After completion of the dropwise addition, aging was performed at 70° C. for 3 hours. Next, after cooling to 40° C., 14.6 ml of a 1N aqueous sodium hydroxide solution was added to partially neutralize the carboxylic acid groups derived from acrylic acid. After distilling off water from the reaction vessel under reduced pressure, a small amount of aggregate was removed by filtration through a mesh, and the solid ...

Synthetic example 2～21

[0098] Using the monomer components and neutralizing agents shown in Table 1, an emulsion binder was obtained by the soap-free emulsion polymerization method in the same manner as in Synthesis Example 1 at the monomer compounding ratio shown in Table 1. In addition, the solid content concentration of the emulsion binder was adjusted to 50%. In Synthesis Examples 19 and 20, 2 parts by weight of a polyoxyethyl sodium lauryl sulfate aqueous solution having a solid content concentration of 25% was added to the ion-exchanged water thrown into the reaction container as a surfactant. In addition, EHA of the synthesis example 20 represents 2-ethylhexyl acrylate.

[0099] [Measurement of solid content]

[0100] The measurement was performed in an automatic mode (60 seconds) at a temperature of 120° C. using an infrared moisture meter (kett FD-240, manufactured by Kett Science Institute), and the solid content of the emulsion binder was calculated.

[0101] [Calculation of Tg]

[010...

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Abstract

A negative electrode 16 constituting a non-aqueous electrolyte secondary battery 10, which is an example of an embodiment, comprises a negative-electrode mixture layer 23 including a negative-electrode active material and a binder agent. The negative electrode 16 includes, as the binder agent, at least a polymer constituted by a constituent unit A represented by formula (1), a constituent unit B represented by formula (2), and a constituent unit C represented by formula (3). The molar ratio (l / m) of the constituent unit A to the constituent unit B is from 0.2 to 1.8.

Description

technical field [0001] The present disclosure relates to a negative electrode for a nonaqueous electrolyte secondary battery and a nonaqueous electrolyte secondary battery. Background technique [0002] A negative electrode used in a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery generally consists of a negative electrode current collector and negative electrode mixture layers formed on both surfaces of the current collector. The negative electrode mixture layer contains a negative electrode active material, and also contains a binder to bind the particles of the negative electrode active material to each other and to bind the negative electrode active material to the current collector. Since the performance of the binder has a great influence on battery characteristics, various binders have been developed to improve battery characteristics such as cycle characteristics and storage characteristics. [0003] For example, Patent Document 1 d...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/13
CPCH01M4/13Y02E60/10H01M2004/027H01M4/622H01M10/052C08F220/1804C08F220/1808C08F220/1802C08F220/14C08F220/06H01M2300/0025H01M4/131H01M4/133H01M4/364H01M10/0525
Inventor 和田直之平石笃司高桥庆
Owner PANASONIC HLDG CORP KADOMA SHI
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