Umicore

Centre National De La Recherche Scientifique

Saft

Stephane Levasseur

Michèle Van Thournout

Philippe Carlach

Christian Masquelier

Randy De Palma

Christian Jordy

Georges Caillon

Pierre Gibot

Evgeniya T Devyatkina

Nina V Kosova

Jean-Marie Tarascon

Philippe Biensan

Claude Delmas

Thierry Hezeque

Laurence Croguennec

Frederic Castaing

Julien Breger

Thlerry Hezeque

Jessica Bains

Positive electrode material for lithium-ion battery

A compound of formula Li(MMo)M(OF) wherein: 

Positive electrode material for a lithium-ion accumulator

The invention relates to a LiNiCoMnM'Ocomposite oxide for use as a cathode material in a rechargeable battery, with a non-homogenous Ni/M&#x2032; ratio in the particles, allowing excellent power and safety properties when used as positive electrode material in Li battery. More particularly, in the formula 0.9&#x3c;a&#x3c;1.1, 0.3&#x2266;x&#x2266;0.9, 0&#x3c;y&#x2266;0.4, 0&#x3c;y&#x2032;&#x2266;0.4, 0&#x3c;z&#x2266;0.35, e&#x3c;0.02, 0&#x2266;f&#x2266;0.05 and 0.9&#x3c;(x+y+y&#x2032;+z+f)&#x3c;1.1; M&#x2032; consists of either one or more elements from the group Al, Mg, Ti, Cr, V, Fe, Mn and Ga; N consists of either one or more elements from the group F, Cl, S, Zr, Ba, Y, Ca, B, Sn, Sb, Na and Zn. The powder has a particle size distribution defining a D10, D50 and D90; and the x and z parameters varying with the particles size of the powder, and is characterized in that either one or both of:1&#x2212;2&#x2267;0.005and2&#x2212;1&#x2267;0.005;x1 and z1 being the parameters corresponding to particles having a particle size D90; and x2 and z2 being the parameters corresponding to particles having a particle size D10.

Positive electrode materials combining high safety and high power in a Li rechargeable battery

The invention relates to a LiNiCoMOAcomposite oxide for use as a cathode material in a rechargeable battery, with a non-homogenous Ni/Al ratio in the particles, allowing excellent power and safety properties when used as positive electrode material in Li battery. More particularly, in the formula 0.9&#x3c;a&#x3c;1.1, 0.3&#x2266;x&#x2266;0.9, 0&#x2266;y&#x2266;0.4, 0&#x3c;z&#x2266;0.35, e=0, 0&#x2266;f&#x2266;0.05 and 0.9&#x3c;(x+y+z+f)&#x3c;1.1; M consists of either one or more elements from the group Al, Mg and Ti; A consists of either one or more elements from the group S and C. The powder has a particle size distribution defining a D10, D50 and D90; and said x and z parameters varying with the particles size of said powder, and is characterized in that either one or both of: x1&#x2212;x2&#x2267;0.010 and z2&#x2212;z1&#x2267;0.010; x1 and z1 being the parameters corresponding to particles having a particle size D90; and x2 and z2 being the parameters corresponding to particles having a particle size D10.

Non-homogenous positive electrode materials combining high safety and high power in a Li rechargeable battery

The invention relates to active materials for the manufacture of Li-based batteries. A crystalline nanometric powdered material with formula Li(M, M')PO, in particular LiFePO(O&#x2266;x&#x2266;1), is disclosed, exhibiting single phase Li insertion/extraction mechanism at room temperature when used as positive electrode material in Li-based batteries. Compared to current LiFePO, the novel material results in smooth, sloping charge/discharge voltage curve greatly simplifying the monitoring of the state of charge of the batteries. The coexistence of mixed valence states for Fe (i.e. FeVFe) is believed to increase the electronic conductivity in the room temperature single phase LiFePOmaterial, compared to state of the art two-phase materials. This, together with the nanometric size of the particles and their sharp monomodal size distribution, contributes to the exceptional high-rate capability demonstrated in batteries.

Room temperature single phase Li insertion/extraction material for use in Li-based battery

A compound of formula Li(NiMnCoAl)Owherein: a, b and c are non-zero; a+b+c+y=1; 1.05&#x2266;(1+x)/(1&#x2212;x)&#x2266;1.25; 0.015&#x2266;y(1&#x2212;x); and the atomic amount of manganese representing from 95% to 100% of the atomic amount of nickel.

Positive electrode material for a lithium ion accumulator

The present invention relates to lithium secondary batteries and more specifically to positive electrode materials operating at potentials greater than 2.8 V vs. Li/Li in non-aqueous electrochemical cells. In particular, the invention relates to crystalline nanometric olivine-type LiFeMPOpowder with M is Co and/or Mn, and 0&#x3c;x&#x3c;1, with small particle size and narrow particle size distribution. A direct precipitation process is described, comprising the steps of:&#x2014;providing a water-based mixture having at a pH between 6 and 10, containing a dipolar aprotic additive, and Li, Fe, P, and Coand/or Mnas precursor components;&#x2014;heating said water-based mixture to a temperature less than or equal to its boiling point at atmospheric pressure, thereby precipitating crystalline LiFeMPOpowder. An extremely fine particle size is obtained of about 80 nm for Mn and 275 nm for Co, both with a narrow distribution. The fine particle size is believed to accounts for excellent high-drain properties, while minimizing the need for conductive additives. The narrow distribution facilitates the electrode manufacturing process and ensures a homogeneous current distribution within the battery.

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Brussels, Belgium

Stephane Levasseur