| abstract |
Present invention provide for the positive pole of lithium ion electrochemical cells, at 30 DEG C, when at 2.5V Yu 4.7V vs.Li/Li + Between circulation time, when by the 52nd time circulate after capacity with the 2nd time circulation after capacity compare time, described positive pole 50 times circulation after have greater than about 95% capacity reservation.The compositions that can be used for provided positive pole can have formula 1+x (Ni a Mn b Co c ) 1‑x O 2 , wherein 0.05≤x≤0.10, a+b+c=1,0.6≤b/a≤1.1, c/ (a+b) ＜ 0.25, and a, b and c be all higher than zero.The process preparing these positive poles is included in compositions described in roasting at 850 DEG C to 925 DEG C. |