60results about How to "Enhanced electrochemical window" patented technology

The invention belongs to the technical field of batteries, in particular to an integrated all-solid-state lithium metal battery, including the positive electrode, a negative electrode and an organic-inorganic composite solid electrolyte disposed between the positive electrode and the negative electrode, the negative electrode is made of metal lithium, the organic-inorganic composite solid electrolyte comprises polyethylene oxide, an electrolyte and ceramic nanowires uniformly dispersed in the polyethylene oxide, and an adhesive in the positive electrode comprises a mixture of the polyethyleneoxide and the electrolyte. Compared with the prior art, the organic-inorganic composite solid electrolyte with high ionic conductivity and high mechanical strength can be obtained by uniformly dispersing ceramic nanowires in polyethylene oxide (PEO); Furthermore, the binder in the cathode contains the mixture of polyethylene oxide and electrolyte, which effectively ensures the ion transport in the cathode and the good contact of the interface, so as to obtain the integrated all-solid-state lithium metal battery with high safety and excellent electrochemical performance.

The invention discloses a preparation method of a polymer-added composite cathode and application of the composite cathode in a solid-state battery. The composite cathode is characterized by comprising a composite cathode pole piece and a solid-state electrolyte material, wherein the composite cathode pole piece is prepared from a cathode active material, an additive, a conductive agent and a binder; the solid-state electrolyte material is prepared from a high-molecular polymer with a long chain segment, lithium salt conducting a coordination reaction with the high-molecular polymer, and a fast ion conductor. The invention also discloses a preparation method of the polymer-added composite cathode applied to a solid-state lithium battery. The preparation method is characterized by comprising the following steps: preparing a cathode pole piece, preparing a solid-state electrolyte membrane. The preparation method disclosed by the invention has the following advantages: the arrangement regularity of polyoxyethylene molecular chains is damaged by the effect among the molecular chains of several polymers, the glass-transition temperature is lowered, the crystal formation is inhibited, and the ionic conductance is enhanced.

The invention relates to the field of lithium ion batteries and especially relates to an all-solid-state polymer electrolyte containing high-concentration lithium salt and a preparation method thereof. The all-solid-state polymer electrolyte is made of the lithium salt and a polyvinylidene fluoride-hexafluoropropylene copolymer, and a content of the lithium salt is greater than 50wt.%. The preparation method comprises the following steps: (1) uniformly mixing the polyvinylidene fluoride-hexafluoropropylene copolymer, the lithium salt and a solvent to obtain a precursor solution; and (2) coating a clean and smooth substrate with the precursor solution, forming a film under a ventilation condition, and finally carrying out vacuum drying to obtain the all-solid-state polymer electrolyte. Theall-solid-state polymer electrolyte disclosed by the invention is simple to prepare, relatively low in cost, high in room-temperature ionic conductivity, high in electrochemical window and high in lithium ion transference number, and can be used as the electrolyte of a lithium ion battery.

The invention relates to a flexible manometer porous metal foil electrode. The flexible manometer porous metal foil electrode comprises a flexible conductive metal layer in the middle and metal alloy layers on the two sides, and the metal alloy layers on the two sides are of a manometer porous structure. The invention further relates to a preparation method of the electrode. The preparation method includes the steps that 1, metal alloy plates with uniform structural constituents are prepared; 2, the two layers of metal alloy plates and the flexible conductive metal layer in the middle are prepared into a three-layer alloy composite plate; 3, the alloy composite plate is subjected to annealing treatment; 4, the annealed alloy composite plate is subjected to hot rolling or cold rolling; 5, the step 3 and the step 4 are repeatedly carried out till the alloy composite plate reaches a preset thickness; 6, the obtained alloy composite plate is subjected to surface grinding; 7, finish rolling is carried out till the needed thickness is reached; 8, the obtained alloy composite plate is subjected to chemical and electrochemical corrosion treatment, and the manometer porous structure is formed on the surface metal alloy layers; 9, an obtained electrode is subjected to polarization or low-temperature annealing treatment to achieve partial self-oxidation of the electrode.

The invention discloses a branched structure type lithium bis(fluorosulfonyl) imide polymer(R-(PFSILi)n) and a synthesis method and application thereof. The polymer is a polyanionic lithium salt polymer with a starlike or treelike structure and the molecular structure of the polymer is as shown in the formula (I). The structuring method of the structure comprises the following steps: selecting different polyphenols or polyols as a substrate; carrying out condensation reaction on a fluorinated monomer and the substrate under the action of an acid-binding agent; and then carrying out lithium ion exchange through a lithium salt to obtain a target molecule. Compared with a one-dimensional direct-chain fluoroalkyl sulfimide structure type polymer, the branched structure type polymer disclosed by the invention has better conductivity and excellent compatibility with anode and cathode materials with high electrochemical activity, also has high lithium ion transference number (t<+> is greater than 0.9) and high electrochemical window (>6V), and further has excellent charge and discharge performance and service life.

The invention relates to an electrolyte additive, an electrolyte and a lithium battery, and belongs to the technical field of lithium batteries. The electrolyte additive comprises at least one of thecompounds shown in the structural formula I: a formula which is as shown in the specification, wherein R in the structural formula I is one of a fluorine group, a phenyl group, an alkyl group, and analkenyl group, wherein n is an integer of 1 to 5. According to the electrolyte additive, the electrolyte additive is subjected to a decomposition reaction in the electrolyte, and the obtained productgenerates a protective film on the surface of a positive electrode, so that a passivation effect is achieved, dissolution of a metal element in a positive electrode material and the collapse of the positive electrode material structure are inhibited, the electrochemical stability window of the electrolyte is improved, the working voltage range of the electrolyte is widened, and the cycling efficiency of the battery under a high voltage (for example 4.2-5.0V) can be effectively improved.

The invention relates to a preparation and detection method of a tetracycline aptamer sensor based on a screen-printed electrode. The surface of the screen-printed electrode is modified with an ionic liquid and ferroferric oxide layer by layer and then left to stand at a normal temperature until the surface is dried, and then tetracycline aptamer is fixed on the surface of the screen-printed electrode modified with a nanometer material. The preparation and detection method of the tetracycline aptamer sensor based on the screen-printed electrode well solves the problem about complicated procedures of current electrode pre-treatment, the same batch of electrodes have good uniformity and can be produced in batch, and commercialization is realized. The sensor has better sensitivity, stability and specificity and good regeneration capacity and is very suitable for situations when on-site quick detection of antibiotic residues is required; the recovery rate of the sensor meets requirements.

The invention relates to high-capacity imidazole ionic liquid as well as a preparation method and an application thereof. The structural formula of the ionic liquid is shown in the specification, in the formula, R1 is CH2(CH2)aO(CH2)bCH3, a is 0 or 1, and b is 0 or 1; R2 is CH2(CH2)cCOO(CH2)dCH3, c is 0 or 1, and d is 0 or 1; Y<-> is BF4<->, PF6<->, TFSI<->, FSI<-> or N(CN) 2<->. In the preparation of the imidazole ionic liquid, through ternary substitution, ether groups are introduced to the N-1 site of an imidazole ring, so that the viscosity of the ionic liquid is reduced; an ester group isintroduced to the N-3 site of the imidazole ring, so that the electrochemical window and the electrochemical stability of the ionic liquid are improved. The imidazole ionic liquid is used as an electrolyte additive, is applied to a lithium ion battery taking a ternary material (NCM523) as a positive electrode material, and has good safety performance and electrochemical performance.

The invention relates to the field of lithium batteries, in particular to a solid electrolyte and a lithium battery cell with the solid electrolyte, and a lithium battery. The solid electrolyte includes LiMF<x>H<12-x>, wherein M is B, Ga, Al or a combination thereof. Compared with the existing solid electrolyte, a compound with F atoms has larger molecular volume, and thus can provide largerspace for the Li+ and improve the migration capability of lithium ions. Furthermore, the M-F bond can form a stable structure, so that the solid electrolyte can have high electrochemical window and flexibility, and the structural stability and cycle performance can be improved when lithium ions migrate rapidly. Based on the structural characteristics, the solid electrolyte can have higher shear modulus and Young's modulus.