An electrochemical apparatus, including a positive electrode, a negative electrode, and an electrolyte. The positive electrode includes a positive electrode current collector and a positive electrode mixture layer formed on the positive electrode current collector, where the electrolyte contains a specific proportion of lithium difluorophosphate, and the positive electrode mixture layer has a relatively small thickness change rate.

An electrolyte, an electrochemical device containing same, and an electronic device. Specifically, an electrolyte, including dimethyl carbonate, ethyl methyl carbonate, and lithium bis(oxalato)borate. The ethyl methyl carbonate and the lithium bis(oxalato)borate each account for a specified weight percent in the electrolyte, and the weight percent of the dimethyl carbonate and the weight percent of the ethyl methyl carbonate in the electrolyte meet a specified relationship. The electrolyte provides with balanced rate performance, the low-temperature discharge performance, and the high-temperature storage and cycle performance of the electrochemical device, and helps to achieve excellent comprehensive performance of the electrochemical device.

The present application provides an electrolyte, the electrolyte including a fluorinated metal salt with S═O or P═O; and a titanate with a structural formula Ti—(O—R.sub.1).sub.4, where the R1 is selected from one or more of C.sub.1-C.sub.6 alkyl, C.sub.1-C.sub.6 halogenated alkyl, C.sub.2-C.sub.6 alkenyl, C.sub.2-C.sub.6 alkynyl or C.sub.1-C.sub.6 silyl, and a secondary battery including the electrolyte, a battery module, a battery pack and a power consumption apparatus.

The present invention provides a method of manufacturing of an electrostatic self-assembled Silicon/rGO/carbon nanofibers composite, the method including: (a) obtaining a Si@APTES solution by adding predetermined Si nanoparticles to the piranha solution, and stirring, filtering, washing and drying, and then, dispersing the dried Si nanoparticles in deionized water, by adding APTES, and then stirring; (b) obtaining a Si@N-doped GO dispersion by mixing a mixture with the addition of urea (CH4N2O) to the GO solution and the prepared Si@APTES in step (a) in an ethanol aqueous solution; (c) obtaining a Si@N-doped GO/CNF composite by adding a predetermined CNF to the prepared Si@N-doped GO dispersion in step (b) and stirring it; and (d) obtaining a thermally reduced Si@N-doped rGO/CNF composite through a heat treatment process to the prepared Si@N-doped GO/CNF composite in step (c).

An object is to provide a nonaqueous electrolyte and a nonaqueous-electrolyte secondary battery which have excellent discharge load characteristics and are excellent in high-temperature storability, cycle characteristics, high capacity, continuous-charge characteristics, storability, gas evolution inhibition during continuous charge, high-current-density charge/discharge characteristics, discharge load characteristics, etc. The object has been accomplished with a nonaqueous electrolyte which comprises: a monofluorophosphate and/or a difluorophosphate; and further a compound having a specific chemical structure or specific properties.

The present disclosure discloses a primary lithium battery comprising a reactive solid cathode, a liquid electrolyte, a separator, and a lithium anode. The liquid electrolyte is ionic conductive and is configured to undergo a series coupling reaction after solid phase reaction of the reactive solid cathode and the lithium anode. The liquid electrolyte comprises a solvent and an electrolyte salt, and a concentration of the electrolyte salt in the liquid electrolyte is 0.1-3 mol/L. The solvent comprises a sulfite ester type compound and an organic solvent, and a concentration of the sulfite ester type compound in the organic solvent is 5 wt % to 90 wt %.

A lithium-sulfur battery including an anode, a cathode, a separator, and an electrolyte dispersed throughout the lithium-sulfur battery is provided. The anode may output lithium ions. The cathode may be positioned opposite to the anode and have an overall porosity as defined by multiple non-hollow carbon spherical (NHCS) particles joined together to form tubular NHCS particle agglomerate. Pores may be associated with the overall porosity of the cathode and interspersed uniformly throughout the NHCS particles. In some aspects, each pore having a diameter between 1 nm and 10 nm; and each tubular NCHS agglomerate has a length between 5 micrometers (μm) and 35 μm. Interconnected channels defined in shape by the NHCS particles may be joined to each other and the pores, where some interconnected channels may be pre-loaded with an elemental sulfur and retain polysulfides (PS). Retention of the polysulfides may be based on some NHCS particles.

Provided is a lithium secondary battery including a positive electrode including a positive electrode active material, a negative electrode including a negative electrode active material, a separator interposed between a positive electrode and the negative electrode, and an electrolyte solution. The negative electrode active material includes a silicon-based oxide; and the electrolyte solution includes a lithium salt, a fluorine-substituted cyclic carbonate compound, a non-aqueous organic solvent, and a difluorophosphite compound.

A purpose of the present invention is to provide a lithium ion secondary battery which has further improved life characteristics. The lithium ion secondary battery of the present invention is characterized by comprising a positive electrode comprising a positive electrode active material that operates at 4.5 V or more with respect to lithium, and an electrolyte solution comprising an electrolyte solvent comprising a fluorinated ether, a cyclic sulfonic acid ester and LiN(FSO.sub.2).sub.2.

A battery includes a positive electrode containing sulfur, a negative electrode containing a material for occluding and releasing a lithium ion, and an electrolytic solution. The electrolytic solution contains at least one of a liquid complex and a liquid salt in which a polysulfide is insoluble or almost insoluble, and a solvent in which a polysulfide is soluble. The electrolytic solution has a Li.sub.2S.sub.8 saturation sulfur concentration of 10 mM or more and 400 mM or less.