Layered Anode Active Material for Secondary Batteries, Anode Comprising the Same, and Manufacturing Method Thereof

Layered Lithium Vanadium Titanium Oxide Anode Material via Vanadium Pre-heat Treatment and N2/H2 Reduction Sintering

This technology synthesizes a lithium-based anode active material with improved electrochemical properties by weighing lithium, vanadium, and titanium sources in a specific molar ratio, pre-heat treating the vanadium source to achieve a single phase, and then mixing, pelletizing, and sintering the materials in a nitrogen and hydrogen reducing atmosphere.

Existing anode materials face limitations: silicon suffers from significant volume expansion during charge/discharge cycles, while lithium metal is prone to dendrite growth. These issues have hindered the development of new anode compositions and crystal structures capable of achieving both high capacity and high power output at low discharge potentials.

This technology involves a two-stage heat treatment of the vanadium raw material at 500–700°C and 1100–1300°C to achieve a single phase, followed by mixing with lithium and titanium sources and a two-stage sintering process in a 92% N2 and 8% H2 mixed gas atmosphere to produce Li1.075V0.925-xTixO2 (0

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Key Features:

• Weighing and preparing lithium, titanium, and vanadium sources in a 1.075:0.925-x:x molar ratio
• Heat-treating the weighed vanadium source in two stages—first at 500–700°C and then at 1100–1300°C—to achieve a single phase
• Mixing the heat-treated vanadium product with lithium and titanium sources and compressing the mixture into 9–11mm cubic pellets
• Sintering the pellets in a 92 vol% N2 and 8 vol% H2 mixed gas atmosphere in two stages: first at 550–750°C, then at 1100–1300°C

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