Moli Energy (1990) Limited

Nec Moli Energy (Canada) Limited

E-One Moli Energy (Canada) Limited

Brian Michael Way

Jeffrey R Dahn

Ulrich Von Sacken

Jan Naess Reimers

Yu Wang

Meijie Zhang

Non-aqueous rechargeable lithium batteries can be protected against overcharge abuse by incorporating small amounts of suitable additives into the electrolyte. Additives selected from the group consisting of phenyl-R-phenyl compounds wherein R is an aliphatic hydrocarbon, fluorine substituted biphenyl compounds, and 3-thiopheneacetonitrile can provide superior cycling performance along with satisfactory overcharge protection in high voltage lithium ion batteries. 2,2-diphenylpropane can be a preferred gassing agent additive in batteries equipped with electrical disconnect devices.

Additives for overcharge protection in non-aqueous rechargeable lithium

The loss in delivered capacity (fade rate) after cycling non-aqueous rechargeable lithium batteries can be reduced by incorporating a small amount of an improved additive in the battery. Improved additives include boron trifluoride (BF.sub.3), fluoboric acid (HBF.sub.4), or complexes thereof. The invention is particularly suited to lithium ion batteries. Complexes comprising BF.sub.3 and dietyl carbonate or ethyl methyl carbonate can be prepared which are particularly effective additives. Preferably, the additive is dissolved in the electrolyte.

Additives for improving cycle life of non-aqueous rechargeable lithium

A battery using carbonaceous materials with a graphite or disordered graphite structure wherein boron atoms are substituted for carbon atoms in the structure. The electrochemical potential of the carbonaceous materials is shifted as a result of such substitution, and the electrochemical capacity is increased. Both effects are desirable for anode materials in lithium ion type batteries.

Electron acceptor substituted carbons for use as anodes in rechargeable

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Coquitlam, Canada

Brian Michael Way