Ultrapure Water Requirements for the Lithium Battery and New Energy Industry

Ultrapure Water (UPW) in Lithium-ion Battery Manufacturing

A lithium battery pack utilizes lithium metal or lithium alloy as the cathode material, combined with a non-aqueous electrolyte. These batteries are primarily applied in digital products, power batteries, and emerging high-tech sectors. In recent years, lithium battery production has seen steady annual growth. As a core component, high-quality battery materials have accelerated the development of New Energy Vehicles (NEVs) and electrochemical energy storage, with Ultrapure Water (UPW) systems becoming an indispensable part of the production line.

Water is a critical medium in battery manufacturing. However, standard water contains conductive impurities such as calcium and magnesium ions, solid particles, and colloidal substances. These impurities can significantly shorten battery life and fail to meet national standards for battery-grade water. Therefore, high-purity UPW is required for the preparation of battery electrolytes and materials.

I. Key Application Scenarios

• Electrolyte Preparation: UPW is a fundamental component in the preparation of lithium battery electrolytes. The purity of the electrolyte directly impacts the battery’s energy density, cycle life, and safety. UPW ensures the purity of the electrolytic solution without introducing external contaminants.

• Manufacturing Process & Cleaning: Throughout the battery manufacturing process, UPW is required for the cleaning and treatment of various electrode materials. Even trace impurities can lead to performance degradation or safety hazards; thus, the use of UPW is essential to enhance production yield and product quality.

II. Preparation & Technical Advantages

• Advanced Treatment Technologies: The production of battery-grade UPW typically employs multi-stage water treatment technologies, such as Double-Pass Reverse Osmosis (RO), Electrodeionization (EDI), and Mixed-Bed Ion Exchange. These technologies effectively remove ions and impurities to produce high-purity water that meets stringent manufacturing standards.

• Technical Superiority: Modern UPW equipment features continuous output, eliminates the need for acid-base regeneration, and supports unattended operation. These systems are characterized by simple installation and ease of operation, which not only boosts production efficiency but also reduces operational costs. Furthermore, the highly automated and intelligent design ensures the equipment adapts to the high-precision requirements of lithium battery production lines.