METAL GRADIENT-DOPED CATHODE MATERIAL FOR LITHIUM BATTERIES AND ITS PRODUCTION METHOD
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United States of America Patent
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Mar 16, 2017
app pub date -
Sep 11, 2015
filing date -
Sep 11, 2015
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Disclosed is a metal gradient-doped cathode material for lithium ion batteries including a hexagonal-crystalline material body and a modifying metal. The metal gradient-doped cathode material is formed by coating modifying metal hydroxide on the surface of the hexagonal-crystalline material using a chemical co-precipitation method, then sintering the modifying metal hydroxide coated hexagonal-crystalline material. The modifying metal is different from the active metals, more concentrated on the surface, and gradually decreases toward the core of particle. A gradient-doped distribution is formed without any boundary or layered structure in the particle. The surface of the powder with more the modifying metal can effectively reduce the reactivity of the cathode material with the electrolyte in the lithium battery. Thus, the overall operation-stability and safety of lithium batteries are improved, and only a little amount of the modifying metal is needed, thereby avoiding the reduction of capacity and increasing the rate-capability and cycle-life.
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