Abstract: A method for synthesizing lithium titanate includes preparing a supercritical fluid from water; reacting a solution containing lithium and titanium with the supercritical fluid under a condition that maintains the supercritical fluid in its supercritical state to produce a reaction mixture comprising the lithium titanate; and collecting the lithium titanate. The supercritical fluid is prepared at a temperature of 375-500° C. and a pressure of 22-35 MPa. The solution containing lithium and titanium is prepared by mixing a solution containing lithium, prepared by dissolving a lithium source in a selected solvent, and a solution containing titanium, prepared by dissolving a titanium source in the selected solvent, wherein a molar ratio of lithium:titanium is between 4.0:5.0 and 4.5:5.0. The lithium source is lithium hydroxide, lithium carbonate, lithium acetate, lithium oxalate, lithium nitrate, or lithium oxide, and the titanium source is tetrabutyl titanate.

Abstract: A method for preparing a Li4NbxTi5-xO12/C nanocomposite as anode material for lithium-ion batteries is disclosed, which includes the following steps: (a) obtaining a mixture of a lithium salt, niobium pentaoxide, titanium dioxide (TiO2), and a carbon source in a selected stoichiometric ratio; (b) mixing the mixture in a dispersant to produce a slurry; (c) drying the slurry to produce a dried mixture; (d) treating the dried mixture under a protective atmosphere, according to a heating program to produce the Li4NbxTi5-xO12/C nanocomposite, wherein the heating program comprises: calcining the dried mixture at 600° C. for 2-6 hours, heating it at a rate of 2-20° C. per minute to 950-980° C., cooling it by natural cooling to 800-850° C., maintaining the temperature at 800-850° C. for 16 hours, and cooling it by natural cooling to room temperature.

Abstract: A cathode active material represented by the formula, LiFexPO4/C, wherein 0.9?x<1, preferably 0.96?x<1, which was obtained from carbon pre-coated off-stoichiometric FexPO4, wherein 0.9?x<1, preferably 0.96?x<1. The materials may be double-carbon-coated particles obtained by carbon coating a mixture of a lithium component and FexPO4/C sub-particles, wherein the FexPO4/C sub-particles may be obtained by carbon coating FexPO4.

Abstract: A high-voltage lithium-ion battery cathode material includes LiNi0.5-xMn1.5MxO4 (0?x?0.2, M?Mg, Zn, Co. Cu, Fe, Ti, Zr, Ru, and Cr), which is coated with a coating material, which may be a carbon coating material, a metal phosphate coating material, or a combination thereof. The carbon coating material may be acetylene black, graphene oxide, conductive graphite, glucose, sucrose, starch, lactose, maltose, phenolic resins, polyvinyl alcohol, or a combination thereof, and the metal phosphate coating material may be FePO4, LiFePO4, CoPO4, Mn3(PO4)2, LnPO4. The coating material may account for 1 to 10% (wt %). Products of the present invention have high reversible capacities. Synthesis methods are disclosed that are simple and controllable, can produce uniform coating, and are suitable for industrial scale production.

Abstract: A method for synthesizing lithium titanate includes preparing a supercritical fluid from water; reacting a solution containing lithium and titanium with the supercritical fluid under a condition that maintains the supercritical fluid in its supercritical state to produce a reaction mixture comprising the lithium titanate; and collecting the lithium titanate. The supercritical fluid is prepared at a temperature of 375-500° C. and a pressure of 22-35 MPa. The solution containing lithium and titanium is prepared by mixing a solution containing lithium, prepared by dissolving a lithium source in a selected solvent, and a solution containing titanium, prepared by dissolving a titanium source in the selected solvent, wherein a molar ratio of lithium:titanium is between 4.0:5.0 and 4.5:5.0. The lithium source is lithium hydroxide, lithium carbonate, lithium acetate, lithium oxalate, lithium nitrate, or lithium oxide, and the titanium source is tetrabutyl titanate.

Abstract: A lithium ion battery includes a first electrode made of a cathodic material; a second electrode made of an anodic material; an electrolyte solution; and an additive added to the electrolyte solution, wherein the additive comprises a conjugated system and a bi-functional hydrogen bonding moiety. The additive includes a ?OH group and an N atom. The additive includes a compound having a structure shown as follows: wherein R2, R3, R4, R5, R6, and R7 are each independently selected from H, halogen, —OH, —NH2, —NO2, —CN, —CHO, —Si(CH3)3,—NH-alkyl, —O-alkyl, or an alkyl, wherein the alkyl group is C1-C12 alkyl; preferably, C1-C6 alkyl; more preferably C1-C3 alkyl; and wherein the alkyl group may be optionally substituted with one or more substituents selected from —OH, —NH2, —NO2, —CN, —CHO.

Abstract: A cathode active material represented by the formula, LiFexPO4/C, wherein 0.9?x<1, preferably 0.96?x<1, which was obtained from carbon pre-coated off-stoichiometric FexPO4, wherein 0.9?x<1, preferably 0.96?x<1. The materials may be double-carbon-coated particles obtained by carbon coating a mixture of a lithium component and FexPO4/C sub-particles, wherein the FexPO4/C sub-particles may be obtained by carbon coating FexPO4.

Abstract: A method for preparing a Li4NbxTi5-xO12/C nanocomposite as anode material for lithium-ion batteries is disclosed, which includes the following steps: (a) obtaining a mixture of a lithium salt, niobium pentaoxide, titanium dioxide (TiO2), and a carbon source in a selected stoichiometric ratio; (b) mixing the mixture in a dispersant to produce a slurry; (c) drying the slurry to produce a dried mixture; (d) treating the dried mixture under a protective atmosphere, according to a heating program to produce the Li4NbxTi5-xO12/C nanocomposite, wherein the heating program comprises: calcining the dried mixture at 600° C. for 2-6 hours, heating it at a rate of 2-20° C. per minute to 950-980° C., cooling it by natural cooling to 800-850° C., maintaining the temperature at 800-850° C. for 16 hours, and cooling it by natural cooling to room temperature.