The present disclosure relates to a negative electrode material that may be used as a negative electrode active material. The negative electrode material includes a silicon oxide material containing a metal (M)-silicate and a carbonaceous material. According to an embodiment of the present disclosure, the negative electrode material may include the silicon oxide material containing a metal (M)-silicate and the carbonaceous material mixed with each other at a predetermined ratio. The negative electrode active material according to the present disclosure comprises a composite of a carbonaceous material having a broad particle size distribution with a metal-silicate, and thus provides improved electrical conductivity and life characteristics.

The present disclosure describes various types of batteries, including lithium-ion batteries having an anode assembly comprising: an anode comprising a first porous ceramic matrix having pores; and a ceramic separator layer affixed directly or indirectly to the anode; a cathode; an anode-side current collector contacting the anode; and anode active material comprising lithium located within the pores or cathode active material located within the cathode; wherein, the ceramic separator layer is located between the anode and the cathode, no electrically conductive coating on the pores contacts the separator layer, and in a fully charged state, lithium active material in the anode does not contact the separator layer. Also disclosed are methods of making and methods of using such batteries.

Electrolytes and electrolyte additives for energy storage devices comprising functional thiophene compounds are disclosed. The energy storage device comprises a first electrode and a second electrode, wherein at least one of the first electrode and the second electrode is a Si-based electrode, a separator between the first electrode and the second electrode, an electrolyte, and at least one electrolyte additive selected from a thiophene compound.

A positive-electrode material for a lithium secondary battery is provided. The material includes a lithium oxide compound or a complex oxide as reactive substance. The material also includes at least one type of carbon material, and optionally a binder. A first type of carbon material is provided as a coating on the reactive substance particles surface. A second type of carbon material is carbon black. And a third type of carbon material is a fibrous carbon material provided as a mixture of at least two types of fibrous carbon material different in fiber diameter and/or fiber length. Also, a method for preparing the material as well as lithium secondary batteries including the material is provided.

The invention relates to a particulate material comprising a plurality of composite particles, wherein the composite particles comprise: (a) a porous carbon framework comprising micropores and mesopores having a total pore volume of at least 0.6 cm.sup.3/g and no more than 2 cm.sup.3/g, where the volume fraction of micropores is in the range from 0.5 to 0.9 and the volume fraction of pores having a pore diameter no more than 10 nm is at least 0.75, and the porous carbon framework has a D.sub.50 particle size of less than 20 μm; (b) silicon located within the micropores and/or mesopores of the porous carbon framework in a defined amount relative to the volume of the micropores and/or mesopores.

Described herein are improved composite anodes and lithium-ion batteries made therefrom. Further described are methods of making and using the improved anodes and batteries. In general, the anodes include a porous composite having a plurality of agglomerated nanocomposites. At least one of the plurality of agglomerated nanocomposites is formed from a dendritic particle, which is a three-dimensional, randomly-ordered assembly of nanoparticles of an electrically conducting material and a plurality of discrete non-porous nanoparticles of a non-carbon Group 4A element or mixture thereof disposed on a surface of the dendritic particle. At least one nanocomposite of the plurality of agglomerated nanocomposites has at least a portion of its dendritic particle in electrical communication with at least a portion of a dendritic particle of an adjacent nanocomposite in the plurality of agglomerated nanocomposites.

The epsilon polymorph of vanadyl phosphate, ε-VOPO.sub.4, made from the solvothermally synthesized H.sub.2VOPO.sub.4, is a high density cathode material for lithium-ion batteries optimized to reversibly intercalate two Li-ions to reach the full theoretical capacity at least 50 cycles with a coulombic efficiency of 98%. This material adopts a stable 3D tunnel structure and can extract two Li-ions per vanadium ion, giving a theoretical capacity of 305 mAh/g, with an upper charge/discharge plateau at around 4.0 V, and one lower at around 2.5 V.

An electrochemical cell includes a. a cathode capable of reversibly accommodating lithium ions; b. an anode containing metallic lithium as active material; and c. a separator arranged between the cathode and the anode, wherein d. the anode includes a porous, electrically conductive matrix having an open-pored structure; and e. the metallic lithium of the anode is incorporated in pores of the matrix.

An anode active material, and an electrochemical device and electronic device using such anode active material. Also, an anode active material, including graphite. Controlling a graphitization degree of particles of different particle sizes of the anode active material can achieve a balance between kinetic performance and first cycle efficiency of the electrochemical device.

A cobalt-free positive electrode material and a preparation method therefor, a lithium ion battery positive electrode, and a lithium ion battery, relating to the technical field of lithium ion batteries. The positive electrode material comprises a core and a shell covering the core, the core being a cobalt-free positive electrode material, the chemical formula of the core being LiNi.sub.xMn.sub.yO.sub.2, wherein 0.55≤x≤0.95 and 0.05≤y≤0.45, and the shell is a coating agent and carbon. The present method can improve the dispersibility of the cobalt-free positive electrode material during the coating process, and can also improve the conductivity of the cobalt-free positive electrode material.