This Is What BYD Is Doing in Solid-State Batteries

Solid electrolyte for all-solid-state batteries with improved ion conductivity and density compared to existing solid electrolytes. The electrolyte composition has a molar ratio of (40-90) ZnX2 to (10-60) LiY, where X is a halide like F, Cl, Br, or I, and Y is also a halide. This composition provides a dense, low-volatility solid electrolyte without the issues of oxide or sulfide electrolytes. The halide-based electrolyte can have higher ionic conductivity than oxide electrolytes and better density than sulfide electrolytes. The composition can further contain reinforcing components like Be, Al, Ga, In, Tl, and F, Cl, Br, I compounds. The halide-based electrolyte can be prepared by pre-sinter

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A solid-state battery with improved performance and stability compared to existing batteries. The battery uses a unique solid electrolyte composition that combines high strength, high ionic conductivity, and air stability. The electrolyte consists of a eutectic mixture of oxide and sulfide glasses with a small amount of oxide additive. The oxide glass improves strength and processability, the sulfide glass provides high ionic conductivity, and the oxide additive connects the two networks. The eutectic composition enables glass formation and avoids phase separation issues. The resulting solid electrolyte has desirable properties for solid-state batteries like high ionic conductivity, good processability, and stability in air.

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Composite solid electrolyte for all-solid-state batteries that combines high stability, high processability, high ionic conductivity, and air stability. The composite electrolyte is made by dispersing sulfide glass microbeads in an oxide glass matrix. The sulfide beads improve ionic conductivity without compromising the strength of the oxide glass. The composite structure allows high ionic conductivity, stability, and strength compared to single phase oxide or sulfide electrolytes.

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All-solid-state lithium battery with improved performance and safety using a composite negative electrode material. The composite has a core of glassy solid electrolyte with dispersed amorphous lithium-silicon particles. An amorphous lithium-silicon alloy layer clads the core. This configuration reduces volumetric expansion during lithium intercalation/deintercalation and improves contact between the electrode and electrolyte. The composite negative electrode, glassy electrolyte, and solid-state battery are prepared by ball milling and heat treatment.

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All-solid-state lithium batteries with high energy density and cycle life for electric vehicles. The batteries use a special type of silicon anode material with a core of glassy solid electrolyte dispersed with amorphous lithium-silicon particles. The core provides structural stability during cycling to prevent volume expansion issues. The amorphous lithium-silicon particles improve lithium ion transfer and reduce impedance. The core and particles are coated with an amorphous lithium-silicon layer. This prevents contact issues between particles. The coating also reduces impedance and improves cycling performance.

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Polymer electrolyte for solid-state lithium-ion batteries with improved performance and reduced safety risks. The polymer electrolyte has multiple polymer films stacked with interfacial layers between them. The interfacial layers have graded compositions of the adjacent films' polymers to improve compatibility and reduce resistance at the interfaces. This reduces interface impedance and improves battery cycle and rate performance. The electrolyte also has a third polymer film with additives and ionic liquid to further enhance performance and reduce lithium dendrite formation.

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A positive electrode composite material for all-solid-state lithium batteries that has improved cycle stability and reduces the risk of solid electrolyte degradation compared to conventional coated cathodes. The composite coating layer contains both inorganic material like LiNbO3 and a polymer. The inorganic material improves lithium ion conductivity, the polymer provides binding force, flexibility, and self-repair. The polymer composition is a specific diisocyanate-containing polymer with tailored parameters.

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Negative electrode material for all-solid-state lithium batteries with high capacity and cycle life. The negative electrode has an inner core made of amorphous lithium silicon particles dispersed in a glassy solid electrolyte. An amorphous lithium silicon alloy coating surrounds the core. The coating composition is Li y Si, where 0 < y <= 4.4. This composition improves the negative electrode's volume expansion during charging/discharging compared to pure silicon. The inner core with glassy electrolyte provides better interfacial contact between the silicon particles and electrolyte compared to using pure silicon. The coating further improves the interface compatibility between the core and solid electrolyte.

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Composite solid electrolyte material for improving the performance of negative electrodes in all-solid-state lithium batteries. The composite electrolyte has a coating layer on the surface of a solid electrolyte body. The coating material includes antimony, bismuth, antimony-bismuth alloy, antimony-lithium alloy, bismuth-lithium alloy, or antimony-bismuth-lithium alloy. The coating provides both electron conductivity and ion conductivity to the negative electrode without adding excessive amounts of conductive agents. This improves the capacity and cycling stability of the negative electrode compared to adding conventional solid electrolyte without the coating. The coating layer material averages lower working voltage than the negative active material to prevent cycling degradation.

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All-solid-state lithium battery with improved cycle life and capacity compared to conventional solid-state batteries. The negative electrode is a composite of lithium silicon alloy particles coated with carbon and surrounded by a lithium silicon alloy layer also coated with carbon. This sandwich structure prevents excessive volume expansion during charge/discharge cycles. The carbon coatings improve conductivity and provide a buffer between the lithium and silicon layers to mitigate expansion. The lithium silicon alloy composition allows partial lithium extraction during charging for better cycling.

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Composite solid-state electrolyte material for high-capacity all-solid-state lithium batteries with silicon anodes. The composite electrolyte coated on the silicon anode provides higher discharge capacity and cycling stability compared to bare solid electrolytes. The composite electrolyte is made by coating the silicon surface with a layer of materials like antimony, bismuth, antimony-lithium alloys, or antimony-bismuth-lithium alloys. This coating improves the silicon anode's electronic conductivity and lithium intercalation without adding large amounts of conductive additives that reduce capacity.

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All-solid-state lithium battery with improved cycling stability and capacity retention due to reduced volume changes during charge/discharge. The negative electrode material is a composite of an inner core made of glassy solid electrolyte with dispersed amorphous lithium-silicon particles, covered by an amorphous lithium-silicon layer. The amorphous particles prevent volume expansion of the silicon anode during lithium intercalation/deintercalation. Coating the core with amorphous lithium-silicon further reduces volume changes. This composite structure improves cycling performance of all-solid-state lithium batteries compared to conventional silicon anodes.

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Lithium battery with improved performance by using a unique positive electrode material, preparation method, and lithium battery structure. The positive electrode active material is Li4MS4+x (M=Si, Ge, Sn; x=1-12) made by reacting Li4MS4 with sulfur. This forms a lithium ion transmission channel between the elemental sulfur and the solid electrolyte, improving ionic conductivity. The water-stable Li4MS4 also avoids hydrogen sulfide gas generation. The battery structure uses this positive electrode, solid electrolyte, and negative electrode.

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All-solid-state lithium ion battery with improved cycle life and specific capacity compared to existing all-solid-state batteries. The battery uses an all-solid-state electrolyte composition containing PVDF-HFP, perfluoropolyether, and a first lithium salt. The perfluoropolyether has a fluorine content of 40-90 wt% to improve ionic conductivity without reducing mechanical strength. This composition can be used in an all-solid electrolyte, electrode, and all-solid lithium ion battery. The perfluoropolyether interacts with the PVDF-HFP and salt to weaken lithium ion binding, reduce crystallinity, and improve dissociation.

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Lithium-ion battery design to improve energy density, safety, and cycle life while eliminating liquid electrolytes. The battery has a repeating unit with separate negative electrodes stacked between separators. One negative electrode charges to a lower capacity than the other. This prevents dendrite growth as lithium can't bridge between electrodes. The separators contain a solid electrolyte to replace the liquid electrolyte. The design allows higher voltage cathodes and lower voltage anodes to maximize energy density. It also reduces thermal runaway risk by removing the flammable liquid electrolyte. The separate negative electrodes prevent short circuits caused by dendrite growth. The solid electrolyte separators improve safety and cycle life versus liquid electrolytes.

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Solid electrolyte for lithium-ion batteries that provides improved safety and energy density compared to existing sulfide electrolytes. The electrolyte composition is a lithium sulfide-based compound with varying amounts of crystal water. The formula is Li2S-MS2·nH2O, where M is Si, Ge, or Sn, and n is 1-12. This composition avoids short circuits and dendrite formation in lithium metal batteries, improves cycle stability, and reduces polarization compared to other sulfide electrolytes. It also has lower sensitivity to moisture.

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Solid electrolyte for all-solid-state lithium batteries that enables high density and dendrite-free lithium plating. The electrolyte is made from a composition of ZnX2 and LiY with molar ratios of (40-90):(10-60) where X and Y are selected from F, Cl, Br, and I. This provides a low-oxidation-potential, stable, and dense solid electrolyte with good ionic conductivity. The electrolyte can further contain a reinforcing component MZ2 and WQ3 where M, W, Z, and Q are selected from F, Cl, Br, and I. The electrolyte is prepared by melting and quenching the raw materials at temperatures in a specific range.

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A multilayer polymer electrolyte for solid-state lithium batteries that improves compatibility between layers to reduce interfacial impedance and improve battery performance. The electrolyte consists of stacked films of different polymers with gradient polymer concentration between films. This gradual transition helps match the properties of adjacent films. The gradient composition films are prepared by electrospinning and solvent removal. The multilayer electrolyte includes a first polymer film, an intermediate polymer interface layer, and a second polymer film. The interface layer contains both the first and second polymers with descending and increasing concentrations, respectively.

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