Method for Manufacturing Lithium-Transition Metal Oxide Using Prussian Blue Analog, Lithium-Transition Metal Oxide, and Lithium Secondary Battery

Layered Lithium-Transition Metal Oxides with High-Rate Capability Using Prussian Blue Analog Thermal Decomposition

This technology produces structurally stable layered lithium-transition metal oxides by coating Prussian Blue Analog (PBA) particles with lithium salt and a transition metal precursor, followed by thermal decomposition in an air atmosphere to replace CN bridges within the PBA with oxygen bridges.

Conventional lithium-transition metal oxides suffer from poor high-rate, or high-power, performance. Furthermore, manufacturing processes often lead to structural instability caused by crystal defects or cation mixing.

This technology minimizes crystal defects by aging PBA particles for 3–5 weeks, prevents structural collapse during calcination by coating LiOH and transition metal precursors onto particle surfaces and pores, and forms a hexagonal layered structure with a c/a ratio of 1.4–1.5 through two-stage calcination at 800–900°C and 750–850°C. Suitable for hybrid vehicle cells requiring high instantaneous power or high-discharge industrial batteries, its uniform cubic particles also simplify electrode packing design.

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Key Features:

• Forming Prussian Blue Analog particles with a composition of M1aM2b[M3(CN)6]c, consisting of transition metals such as Ni, Mn, and Co
• Coating the PBA particles with lithium salt by dispersing them in an aqueous solution of dissolved lithium salt, followed by filtering and drying
• Thermally decomposing the lithium-coated PBA particles in an air atmosphere to oxidize the CN bridges into oxygen bridges
• Calcining the oxidized product in two stages to obtain a hexagonal layered lithium-transition metal oxide

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This invention was developed with support from the Ministry of Trade, Industry and Energy for the development of manufacturing processes for cathode/anode materials and electrodes to achieve high-rate characteristics in lithium secondary batteries for frequency regulation.

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