One variation of a battery unit includes: a substrate including silicon and defining a cell, wherein the cell includes a base encompassed by a continuous wall and a set of posts extending normal to the base; an electrolyte material coating vertical surfaces of each post, in the set of posts, and vertical surfaces of the continuous wall in the cell; a cathode material filling the cell over the electrolyte material, between posts in the set of posts, and between the set of posts and the continuous wall; a seal extending along a top of the continuous wall; and a cathode current collector bonded to the seal, electrically coupled to the cathode material, and cooperating with the substrate to enclose the cell to form a single-cell battery.

An example includes a method including forming a battery electrode by disposing an active material coating onto a silicon substrate, assembling the battery electrode into a stack of battery electrodes, the battery electrode separated from other battery electrodes by a separator, disposing the stack in a housing, filling the interior space with electrolyte, and sealing the housing to resist the flow of electrolyte from the interior space.

The present disclosure is directed to providing improved processability by forming a protective film on the surface of lithium metal used as an electrode layer through a simple process, and to improving the cycle characteristics of a lithium metal secondary battery by forming a stable protective film. The present disclosure provides a method for manufacturing a negative electrode, including the steps of: (S1) preparing lithium metal; and (S2) dipping the lithium metal in an acid solution for 60-120 seconds to form a LiF film on the surface of lithium metal.

A powder comprising pillared particles for use as an active component of a metal ion battery, the pillared particles comprising a particle core and a plurality of pillars extending from the particle core, wherein the pillared particles are formed from a starting material powder wherein at least 10% of the total volume of the starting material powder is made up of starting material particles having a particle size of no more than 10 microns.

A secondary battery including: a plurality of unit cells, wherein each unit cell of the plurality of unit cells includes a cathode extending in a top to bottom direction, an electrolyte membrane surrounding at least three surfaces of the cathode, and an anode surrounding at least a portion of the electrolyte membrane, wherein unit cells of the plurality of unit cells are spaced apart from each other in a left to right direction, with cavities therebetween, and a support member configured to support the plurality of unit cells in the left to right direction and disposed between unit cells of the plurality of unit cells.

The invention provides a cathode particle comprising a secondary particle comprised of primary particles sans lithium proximal to their surfaces, wherein each of the primary particles have embedded carbon layers or passageways. Also provided is a method for making a single crystal particle having embedded carbon layers, the method comprising dissolving metal salts and carbon stock in water to create a solution; mixing the solution with a lithium containing compound at a subcritical temperature of water to create a mixture of agglomerated particles; allowing the mixture to reach a hydrothermal reaction condition for a time to form carbon layered grain-free single crystal lithiated particles; removing surface lithium from the single crystal lithiated particles; drying the single crystal partially de-lithiated particles after washing and filtering; and heat-treating the particles after forming granulated secondary particles such that the secondary particles comprise a plurality of the primary particles physically contacting each other.

Techniques are provided for implementing hybrid cathodes for batteries. In one example, a battery cathode includes a solid cathode material having an open pore structure and formed of a carbon monofluoride material and one or both of a phthalocyanine compound and a manganese oxide material and lithium polysulfide disposed within pores of the solid cathode material. In another example, a method includes assembling a solid cathode material and lithium metal anode with a porous separator therebetween, where the solid cathode material has an open pore structure and is formed of a carbon monofluoride material and one or both of a phthalocyanine compound and a manganese oxide, forming a catholyte having lithium polysulfide and infiltrating pores of the solid cathode material and the separator with the catholyte.

The present invention is directed to compositions comprising at least one layer or at least two layers, each layer comprising a substantially two-dimensional array of crystal cells, having first and second surfaces, each crystal cell having the empirical formula of M.sub.n+1X.sub.n, where M, X, and n are described in the specification, and devices incorporating these compositions.

One variation of a battery unit includes: a substrate including silicon and defining a cell, wherein the cell includes a base encompassed by a continuous wall and a set of posts extending normal to the base; an electrolyte material coating vertical surfaces of each post, in the set of posts, and vertical surfaces of the continuous wall in the cell; a cathode material filling the cell over the electrolyte material, between posts in the set of posts, and between the set of posts and the continuous wall; a seal extending along a top of the continuous wall; and a cathode current collector bonded to the seal, electrically coupled to the cathode material, and cooperating with the substrate to enclose the cell to form a single-cell battery.

A negative active material for rechargeable lithium secondary batteries, a method of preparing the same, and a rechargeable lithium secondary battery including the same are disclosed. The negative active material includes a core including a lithium titanium oxide of Formula 1, and a coating layer positioned on a surface of the core and including an acid anhydride physisorbed onto the core, and thus can be useful in inhibiting battery side reactions and gas generation and improving battery performance since moisture formed during a redox reaction is effectively absorbed into a surface of the negative active material.
Li.sub.xTi.sub.yO.sub.4[Formula 1] In Formula 1, x and y are as defined in the detailed description.