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High Performance Si Negative Electrode Composed of Silicate Inorganic Binder

Article of Honda R&D Technical Review Vol.33 No.1

Summary

Use of a silicate inorganic binder was investigated with the goal of suppressing volume expansion of Si negative electrodes associated with charge-discharge.
Use of a Si negative electrode with the electrode density lowered by conductive carbon and with inorganic binder permeated to the electrode interior enabled control of the amount of electrode expansion associated with charge-discharge and suppression of delamination from the current collector and conductive path breakdown within the active material layer. This realized a high-performance Si negative electrode with a large reversible charge-discharge capacity.
XPS analysis and STEM-EDX analysis were performed to elucidate these factors. The results showed that in electrodes coated with an inorganic binder, a network of siloxane bonds formed and strong bonds were obtained, and an interface phase in which the Si and inorganic binder are fused also formed.

Reference

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Author (organization or company)

Makiko TAKAHASHI(Innovative Research Excellence)、Tomohiro KINOSHITA(Innovative Research Excellence)、Kiyoshi TANAAMI(Innovative Research Excellence)、Shintaro AOYAGI(Innovative Research Excellence Power Unit & Energy )、Takashi MUKAI(ATTACCATO Limited Liability Company)、Yuta IKEUCHI(ATTACCATO Limited Liability Company)、Taichi SAKAMOTO(ATTACCATO Limited Liability Company)、Naoto YAMASHITA(ATTACCATO Limited Liability Company)

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