Patent ID: 9698418
Date: 2017-07-04
CPC Classifications: C01D,C01G,C01P,H01M,Y02E

Claim:
1. A positive electrode material for lithium ion batteries, comprising a lithium transition metal oxide powder, wherein the lithium transition metal oxide powder has a general formula Li a ((Ni z (Ni 1/2 Mn 1/2 ) y Co x ) 1−k A k ) 2−a O 2 , wherein x+y+z=1, 0.1≦x≦0.4, 0.36≦z≦0.50, A is a dopant, 0≦k≦0.1, and 0.95≦a≦1.05, wherein the powder is characterized by a soluble base content SBC obtained at room temperature and a soluble base content SBC-heated obtained upon heating the powder for 5 to 10 hours under air at a temperature ranging from 500° C. to a temperature less than the temperature where the morphology of the powder changes by sintering, whereby the ratio SBC-heated/SBC is less than 110%, and wherein the soluble base content SBC is the sum of the soluble base contents of Li2CO3 type base (SBC-Li2CO3) and LiOH type base (SBC-LiOH), both expressed in wt %, whereby (SBC-Li2CO3)≧0.085wt %.