With the development of industry in our country, many fields have begun to apply new materials, including lithium iron phosphate, graphene, lithium carbonate, etc. Their pure water requires the final effluent water quality to reach 15M Ω * cm (25 ℃) or above.

Among them, lithium iron phosphate is a lithium-ion battery electrode material with the chemical formula LiFePO4, mainly used in various lithium-ion batteries. Since the NTT in Japan first exposed the olivine structure of AyMPO4 (A is an alkali metal, M is a combination of CoFe: LiFeCoPO4) as a lithium-ion battery cathode material in 1996, John from Texas State University in the United States in 1997 B. Goodenough and other research groups also reported on the reversible migration and removal of lithium from LiFePO4. The simultaneous publication of olivine structure (LiMPO4) by the United States and Japan has attracted great attention and sparked extensive research and rapid development. Compared with traditional lithium-ion secondary battery cathode materials, spinel structured LiMn2O4 and layered structured LiCoO2, LiMPO4 has a wider range of raw material sources, lower prices, and no environmental pollution.

Why does ultrapure water need to be used in lithium iron phosphate? Because lithium iron phosphate is an electrode material for lithium-ion batteries, and conventional source water such as drinking water and municipal tap water have a certain degree of conductivity. Taking Wuhan municipal tap water as an example, its conductivity is generally between 180-240 μ In the production and research of lithium iron phosphate, the accuracy of various experimental data is required to be very strict, so it is necessary to wash and test the experimental vessels and samples. If municipal tap water or groundwater is used, it will lead to contamination of the experimental vessels and samples with substances such as calcium, magnesium, iron, zinc in the raw water, resulting in inaccurate experimental data.

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