The present invention provides a nanostructured titanic acid salt and a preparation process and use thereof. The process comprises preparing a dispersion containing titanium peroxy complex; slowly adding a metal compound to the dispersion containing the titanium peroxy complex to form a solution; adding an alcohol to the solution under normal temperature and normal pressure to produce the nanostructured titanic acid salt precursor precipitate in the solution, and separating the precipitate to obtain the titanic acid salt precursor; drying the precursor, and then heat treating it to obtain the nanostructured titanic acid salt product. The present invention provides a process for preparing a titanic acid salt with simple preparation process, easy control for process parameters and easy large-scale industrial production.

A multilayer electrode includes a current collector, a first electrode mixture layer disposed on at least one surface of the current collector, and a second electrode mixture layer disposed on the first electrode mixture layer. The first and second electrode mixture layers include one or more types of conductive materials. A porosity of the conductive material contained in the second electrode mixture layer is greater than that of the conductive material contained in the first electrode mixture layer. Ion mobility to the inside of an electrode may be improved while maintaining electrical conductivity, by including a conductive material having a relatively great average particle diameter and pores in the conductive material itself. Output characteristics of a lithium secondary battery and charging and discharging performance may be improved.

A positive electrode active material for a lithium secondary battery, comprising a lithium-containing composite metal oxide in the form of secondary particles formed by aggregation of primary particles capable of being doped and undoped with lithium ions, each of the secondary particles having on its surface a coating layer, the positive electrode active material satisfying the following requirements (1) to (3): (1) the metal oxide has an α-NaFeO.sub.2 type crystal structure of following formula (A):
Li.sub.a(Ni.sub.bCo.sub.cM.sup.1.sub.1-b-c)O.sub.2  (A)
wherein 0.9≤a≤1.2, 0.9≤b<1, 0<c≤0.1, 0.9<b+c≤1, and M.sup.1 represents at least one optional metal selected from Mg, Al, Ca, Sc, Ti, V, Cr, Mn, Fe, Cu, Zn, Ga, Ge, Sr, Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag, Cd, In and Sn; (2) the coating layer comprises Li and M.sup.2, wherein M.sup.2 represents at least one optional metal selected from Al, Ti, Zr and W; and (3) the active material has an average secondary particle diameter of 2 to 20 μm, a BET specific surface area of 0.1 to 2.5 m.sup.2/g, and a value of 1.0 to 2.0 as a tamped density/untamped density ratio of the active material.

The present disclosure discloses a method for preparing an anode material for lithium ion battery of a SiC nanoparticle encapsulated by nitrogen-doped graphene. The method includes: in an ammonia atmosphere, heating a SiC nanoparticle for a predetermined time, and cooling to obtain the SiC nanoparticle encapsulated by nitrogen-doped graphene.

The present disclosure provides a cathode material and a method for preparing the cathode material, a cathode, a lithium ion battery and a vehicle. The cathode material comprises a matrix particle, wherein the matrix particle is a monocrystal particle comprising nickel lithium manganate and nickel cobalt lithium manganate. A position in the matrix particle close to a surface layer is provided with a buffer layer. A content of at least one of elements Ni, Co and Mn in the buffer layer is lower than contents thereof in other positions of the matrix particle. The cathode material has at least one of advantages of relatively high specific capacity, cycling stability, better safety performance and the like, and the buffer layer can alleviate erosion by an electrolyte and inhibit separation of active oxygen.

An all-solid secondary battery includes: a cathode layer; an anode layer; and a solid electrolyte between the cathode layer and the anode layer, wherein the anode layer includes an anode current collector and a first anode active material layer on the anode current collector, the first anode active material layer includes a modified ordered mesoporous carbon, and an oxygen content of a surface of the modified ordered mesoporous carbon is about 3 atomic percent to about 10 atomic percent, based on a total content of the surface, when determined by an X-ray photoelectron spectroscopy spectrum of the surface of the modified ordered mesoporous carbon.

A method of treating the surface of a positive electrode active material that is capable of inhibiting a reaction at the interface between a sulfide-based solid electrolyte and the positive electrode active material. A positive electrode active material particle for sulfide-based all-solid-state batteries, the surface of which is reformed, using the method and a sulfide-based all-solid-state battery, the charge/discharge characteristics of which are improved, including the same are also disclosed. The positive electrode active material particle for sulfide-based all-solid-state batteries manufactured using a dry-type method exhibits larger capacity than a positive electrode active material particle for sulfide-based all-solid-state batteries manufactured through a conventional wet-type process. In addition, the manufacturing process is simplified, and the amount of byproducts is reduced.

An anode for a secondary battery including an anode active material and a secondary battery including the anode and having improved stability and reduced resistance are disclosed. In an aspect, the anode active material includes a silicon-based active material having a specific surface area (BET) in a range from 0.5 m.sup.2/g to 5 m.sup.2/g, a first carbon-based active material having an average particle diameter (D50) in a range from 1 μm to 4 μm, and a second carbon-based active material having an average particle diameter greater than that of the first carbon-based active material.

Embodiments of the present disclosure generally relate to carbon materials for battery electrodes and methods for preparing such carbon materials. More specifically, embodiments relate to methods for coating a carbon film onto nano-ordered carbon particles to produce carbon-coated particles which can be used as an anode material within a battery, such as a lithium-ion battery, a sodium-ion battery, other types of batteries. In one or more embodiments, a method for producing carbon-coated particles is provided and includes positioning nano-ordered carbon particles within a processing region of a processing chamber, purging the processing region containing the nano-ordered carbon particles with an inert gas, heating the nano-ordered carbon particles to a temperature of about 700° C. or greater during an annealing process, and depositing a carbon film on the nano-ordered carbon particles to produce carbon-coated particles during a vapor deposition process.

Exemplary embodiments of positive electrode active materials in the form of single particles, and a method of preparing each of them, are provided. The single particles of the exemplary embodiments include single particles of a nickel-based lithium composite metal oxide, having a plurality of crystal grains, each having a size of 180 nm to 300 nm, as analyzed by a Cu Kα X-ray (X-rα). The single particles include a metal doped in the crystal lattice thereof. One embodiment includes a surface coating. The total content of the metal doped in the crystal lattice thereof and the metal of the metal oxide coated on the surface thereof is controlled in the range of 2500 ppm to 6000 ppm.