Chengdu Jingyuan New Materials Technology Co., Ltd.

Rulan Liao

Yu Wang

Kaiping Wu

Pin Xu

Jiaxiang Wang

Xiaobing You

Yun Lu

A Ni&#x2014;, Co&#x2014;, and Mn&#x2014; multi-element doped positive electrode material for lithium ion batteries and its preparation method are provided. The method for preparing said material consists of: first forming a Ni&#x2014;, Co&#x2014;, and Mn&#x2014; multi-element doped intermediate compound by coprecipitation or chemical synthesis; mixing said multi-element intermediate compound with lithium salt and pre-processing the resulting mixture; adding polyvinyl alcohol into the mixture and mixing uniformly, then pressing the resulting mixture into blocks, and calcining these at 800&#x2dc;930&#xb0; C.; cooling outside the furnace, crushing and passing through a 400-mesh sieve; calcining the resulting powder at 700&#x2dc;800&#xb0; C., cooling outside the furnace and crushing to obtain the product. The positive electrode material obtained by the method described is in the form of non-agglomerated monocrystal particles, with a particle diameter of 0 5&#x2dc;30 &#x3bc;m, the chemical formula LiNiCoMnMO, a compacted density of up to 3.4 g/cm, and an initial discharge capacity of 145&#x2dc;152 mAh/g. This positive electrode material shows excellent cycle performance and a high degree of safety.

Ni-, Co-, and Mn- multi-element doped positive electrode material for lithium battery and its preparation method

The present invention discloses a high compact density nickel-cobalt-manganese multi-element lithium ion battery cathode material with dopants and methods of its preparation. A preparation method of this battery cathode material is as follows: (A) preparing a nickel-cobalt-manganese multi-element intermediate with dopants by co-precipitation or chemical synthesis; (B) preparing a mixture by mixing said multi-element intermediate with a lithium salt; (C) pre-treating the said mixture, then adding into it polyvinyl alcohol and mixing uniformly; (D) pressing the resulting material into lumps, calcining the lumps at 800&#x2dc;950&#xb0; C., cooling after its removal from the furnace, crushing, passing through a 400 mesh sieve; (E) calcining the resulting power at 700&#x2dc;800&#xb0; C., cooling after its removal from the furnace, crushing and sieving to obtain a product. The lithium battery cathode material obtained using the above-described method has the formula LiNiCoMnMO. The cathode material has non-agglomerated single crystal particles. The material has a particle size ranging from 0.6&#x2dc;30 &#x3bc;m, a compact density of 3.5&#x2dc;3.7 g/cm, and an initial discharge capacity of 150&#x2dc;165 mAh/g, with excellent cycling and safety performance.

Nickel-cobalt-manganese multi-element lithium ion battery cathode material with dopants and its methods of preparation

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Chengdu, China

Rulan Liao