🍠 Samsung SDI Between ESS Expansion and Earnings Validation - 2026.10.15

It’s Goguma. Samsung SDI news is coming from several directions today, so let me calmly tie it together. 🍠

ESS: Japan After the U.S.?

News has emerged that Samsung SDI is seeking to expand its ESS (energy storage system) business in Japan, following the U.S. ^[1]. Going by the article’s headline, the idea is to seize an opening created by Chinese-made batteries failing to receive security certification. What’s interesting is that a similar move is already underway in the U.S. The company is pursuing plans to convert some EV battery production lines at the StarPlus Energy (SPE) plant to ESS use, and is also aiming to begin mass production of lithium iron phosphate (LFP) batteries in the fourth quarter of this year ^[2]. Converting EV lines to ESS is a signal of where demand is heading, so it caught my eye.

The LFP Market Is Growing

There’s also news that POSCO Future M has signed a large-scale LFP cathode material supply contract with Samsung SDI ^[3]. The article mentions several figures for the size of the deal, but since they haven’t been fully confirmed, I’ll stick to the word “large-scale” without citing a number. A string of supply contracts on the materials side reads like a hint that LFP demand is holding up, but the articles alone don’t tell us how much of that will show up in Samsung SDI’s earnings. That’s why we need to pause and watch.

Solid-State Batteries and Robots: A New Use Case

The solid-state battery company Factorial, which has received investment from Mercedes-Benz, is reportedly partnering with a Korean materials, components, and equipment company ^[4]. According to the article, Samsung SDI is operating a pilot line called “S Line” at its R&D center in Suwon, and aims to begin mass production of solid-state batteries for humanoid robots in the second half of next year ^[4]. The question with solid-state batteries has always been “When will they be ready?” This time, a new application—robots—has entered the picture. But a target is just a target, so for now it should be read as a plan.

The Stock, the Outlook, and the Remaining Question

The mood around the stock has changed sharply. The closing price on October 15 was ₩542,000, with a daily change of -8.29% ^[5]. After rising as high as ₩596,000 the previous day, it turned lower in just one day—a real roller-coaster session. An article says market analysts expect Samsung SDI to remain profitable, as LG Energy Solution posted strong third-quarter results ^[6]. That’s an outlook reported by the article, not earnings the company has confirmed. A video analysis that links the European EV market with ESS to explain why Samsung SDI is seen as more promising than LG Energy Solution points in the same direction ^[7].

Here’s how I’d sum up the four perspectives. The bullish scenario is that ESS applications spread to Japan as well as the U.S., while LFP and solid-state batteries find broader use, including in robots. The bearish scenario is that it remains unclear how much these plans and contracts will actually contribute to earnings. For now, both scenarios coexist. More than the direction of the stock, I’m curious about when “plans” will show up in the numbers. 🎯 After a stock shaken up in a single day, isn’t it worth wondering how that question will play out too?

📰 Reference News (6)

1

Samsung SDI Seeks to Expand ESS Business in Japan After the U.S., Seizing Opening as Chinese Batteries Lack Security Certification - BusinessPost

비즈니스포스트 · 2026.10.15

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2

Second Week of October: Domestic ESG Hot Clips - IMPACT ON

네이버뉴스 · 2026.10.15

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3

POSCO Future M Gains Momentum in Earnings Improvement with a String of Large LFP Cathode Material Orders, While Um Ki-cheon Helps Secure Investment Funds for the Group

네이버뉴스 · 2026.10.15

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4

Factorial, the Solid-State Battery Company Mercedes-Benz Is Betting On, Partners with Korean Materials, Components, and Equipment Company - THE ELEC

네이버뉴스 · 2026.10.15

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6

K-Battery Companies Double Down on ESS as Hopes for Earnings Recovery Grow

네이버뉴스 · 2026.10.15

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📺 Reference Videos (1)

7

YouTube

Samsung SDI: From Europe’s EV Market to ESS… Why It’s Seen as More Promising Than LG Energy Solution

▶서울경제TV·2026.10.14