32results about How to "Improve lithium ion mobility" patented technology

An additive for an electrolyte solution includes a lithium salt having an oxalato complex as an anion and a compound represented by following Chemical Formula 1. Wherein, a represents C or Si, b represents H or F, and n represents an integer of 1 to 5. A non-aqueous electrolyte solution including the additive and a lithium secondary battery including the electrolyte solution also are provided.

The present invention provides an electrode material for a secondary battery wherein the inside and the surface of a lithium-titanium complex oxide is composited with a fine carbon fiber as a network.

A lithium ion-conducting compound, having a garnet-like crystal structure, and having the general formula: Lin[A(3-a′-a″)A′(a′)A″(a″)][B(2-b′-b″)B′(b′)B″(b″)][C′(c′)C″(c″)]O12, where A, A′, A″ stand for a dodecahedral position of the crystal structure, where A stands for La, Y, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm and / or Yb, A′ stands for Ca, Sr and / or Ba, A″ stands for Na and / or K, 0<a′<2 and 0<a″<1, where B, B′, B″ stand for an octahedral position of the crystal structure, where B stands for Zr, Hf and / or Sn, B′ stands for Ta, Nb, Sb and / or Bi, B″ stands for at least one element selected from the group including Te, W and Mo, 0<b′<2 and 0<b″<2, where C and C″ stand for a tetrahedral position of the crystal structure, where C stands for Al and Ga, C″ stands for Si and / or Ge, 0<c′<0.5 and 0<c″<0.4, and where n=7+a′+2·a″−b′−2·b″−3·c′−4·c″ and 5.5<n<6.875.

The invention provides a preparation method for a graphene / lithium titanate coated lithium sulfide composite material. The preparation method comprises the following steps of (1) loading commercial lithium sulfide into a sealed ball milling tank; then putting the tank into a ball mill to be subjected to ball milling to obtain nanometer lithium sulfide; (2) adding tetrabutyl titanate to ethyl alcohol while stirring, and dissolving to form a tetrabutyl titanate ethyl alcohol solution; (3) enabling the nanometer lithium sulfide to be dispersed to an ethyl alcohol solution containing ammonium hydroxide, and adding the tetrabutyl titanate ethyl alcohol solution to a suspension liquid in a dropwise manner; (4) enabling an obtained precursor to be mixed with lithium carbonate powder, and adding the mixture to a muffle furnace under inert gas protection to perform a reaction to obtain the lithium titanate coated lithium sulfide; and (5) adding the lithium titanate coated lithium sulfide and graphene to tetrahydrofuran, and performing an ultrasonic reaction to obtain the graphene / lithium titanate coated lithium sulfide composite material. The lithium titanate structure is relatively stable in the charge-discharge process of the composite material, so that the loss of sulfur-based material can be effectively prevented.

An additive for an electrolyte solution includes a lithium salt having an oxalato complex as an anion and a compound represented by following Chemical Formula 1.Wherein, a represents C or Si, b represents H or F, and n represents an integer of 1 to 5. A non-aqueous electrolyte solution including the additive and a lithium secondary battery including the electrolyte solution also are provided.