Li[Ni0.6Mn0.2Co0.2]O2 Made From Crystalline Rock Salt Oxide Precursors

Layered lithium nickel manganese cobalt oxide or NMC type cathode materials dominate the lithium-ion battery market. However, the production of their precursor involves the use of large amounts of water and can create waste. All-dry synthesis methods are attractive as they are potentially cheaper and greener. However, it remains a challenge to achieve atomic scale mixing of the precursor elements by dry methods. Here, we report an alternative route to achieve atomic scale mixing by employing thermal interdiffusion to produce a phase pure rock salt structure precursor for NMC cathode materials, which can significantly shorten the preparation time and may further reduce cost. The complications and applicability of using a thermally synthesized precursor to make layered cathode material are presented in detail.

Automated summary

Layered lithium nickel manganese cobalt oxide or NMC type cathode materials are widely used in lithium-ion batteries. However, the traditional production method requires large amounts of water and can generate waste. An alternative all-dry synthesis method using thermal interdiffusion is presented, which allows for atomic scale mixing and greatly reduces preparation time and cost. The complications and applicability of using a thermally synthesized precursor for layered cathode material are discussed.