Reticulated Binder Structure for Battery Negative Electrode

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Solution Overview

Problem

Conventional negative electrodes in batteries face challenges in achieving close contact between active material grains while minimizing the increase in internal resistance, which affects charge-and-discharge efficiency, capacity, and output characteristics.

Innovation Solution

A negative electrode with a binder having a reticulated structure that fills the spaces between the active material grains, enhancing contact without excessive binder coverage, thereby reducing internal resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the binder amount is increased to improve contact between active material grains and current collector, then the contact between grains is improved, but the internal resistance increases due to excessive binder coverage

Engineering Contradiction:
Improvecontact between grainsVSAvoidinternal resistance
Core Design Contradiction:
ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The binder is applied with locally optimized concentration and distribution characteristics. The slurry contains binder at controlled concentrations (0.1-10 wt%) and the application process ensures uniform distribution without excessive coverage, allowing sufficient contact between active material grains while preventing binder accumulation that would increase internal resistance

Inventive Principle:
Principle #3Local quality

Solution Approach 2:

The invention applies binder in controlled partial amounts rather than excessive quantities. By controlling the binder concentration in the slurry and the application parameters, the process achieves sufficient binding between grains and current collector without oversupplying binder that would cover active material surfaces and inhibit ion conduction

Inventive Principle:
Principle #16Partial or excessive action

Data Source

PatentUS10950864B2Negative electrode, battery, battery pack, electronic device, electrically driven vehicle, power storage device, and power system
Publication Date: 2021.03.16 MURATA MFG CO LTD
  • US10950864B2 patent drawing
  • US10950864B2 patent drawing
  • US10950864B2 patent drawing

AI summary

A battery includes a positive electrode, a negative electrode, and an electrolyte. The negative electrode includes an active material having grains and a binder having a reticulated structure. In this battery, spaces between the grains of the active material are filled with the reticulated structure of the binder.