Abstract: A secondary battery and an electrochemical device are provided. The secondary battery includes a positive electrode plate, a separator, an electrolyte solution, and a negative electrode plate. The negative electrode plate includes a negative electrode current collector, and a negative electrode active material layer disposed on the negative electrode current collector. Non-faradaic electric quantity Q C of the negative electrode plate satisfies: 0.05?Q?2.5, wherein Q=Cdl×?U, Cdl nF is non-faradaic capacitance of the negative electrode plate, and ?U V is potential interval of the negative electrode active material layer.

Abstract: A folding pallet truck comprises a frame module, a lifting module installed on the frame module and comprising a mount, and a handle module comprising a tube in rotating fit with the mount, wherein a first constraint part is formed between an end, rotatably connected to the mount, of the tube and the mount, and the handle module is folded by detaching the first constraint part or is unfolded by reassembling the first constraint part. The handle module can be folded to be stored or be unfolded and locked to be used by detaching or reassembling the first constraint part formed between the tube of the handle module and the mount of the lifting module, operation is easy, and the pallet truck has a small size when stored.

Abstract: A folding pallet truck comprises a frame module, a lifting module installed on the frame module and comprising a mount, and a handle module comprising a tube in rotating fit with the mount, wherein a first constraint part is formed between an end, rotatably connected to the mount, of the tube and the mount, and the handle module is folded by detaching the first constraint part or is unfolded by reassembling the first constraint part. The handle module can be folded to be stored or be unfolded and locked to be used by detaching or reassembling the first constraint part formed between the tube of the handle module and the mount of the lifting module, operation is easy, and the pallet truck has a small size when stored.

Abstract: The present disclosure provides a lithium-ion secondary battery and an electrolyte thereof. The electrolyte comprises a lithium salt; a non-aqueous solvent and an additive comprising a first additive and a second additive, the first additive comprises at least one of vinylene carbonate and vinyl ethylene carbonate, the second additive is 4-methylene-1,3-dioxolan-2-one and its derivatives with a structural formula 1 and/or 4,5-dimethylene-1,3-dioxolan-2-one and its derivatives with a structural formula 2; in the structural formula 1 and the structural formula 2, R1, R2, R3 and R4 each are hydrogen, halogen, C1˜C3 alkyl or halogenated alkyl; a weight percentage of the first additive in the electrolyte is 0.2%˜2.0%, a weight percentage of the second additive in the electrolyte is 0.3%˜4.0%. The lithium-ion secondary battery comprises the aforementioned electrolyte.

Abstract: The present disclosure provides a lithium-ion battery and an electrolyte thereof. The electrolyte of the lithium-ion battery comprises: a non-aqueous organic solvent; a lithium salt discloved in the non-aqueous organic solvent; and an additive dissolved in the non-aqueous organic solvent. The additive comprises 1,3-dioxo-heterocyclic compound with a structural formula I and fluoroethylene carbonate; in the structural formula I, R1 and R2 each independently are H, methyl or ethyl; n is an integer selected from 1˜3; a weight percentage of 1,3-dioxo-heterocyclic compound with the structural formula I in the electrolyte of the lithium-ion battery is 0.05%˜5%; a weight percentage of fluoroethylene carbonate in the electrolyte of the lithium-ion battery is 1%˜8%. The lithium-ion battery comprises the aforementioned electrolyte of the lithium-ion battery.

Abstract: The present disclosure provides a lithium ion secondary battery and electrolyte solution thereof. The electrolyte solution of the lithium ion secondary battery includes a nonaqueous organic solvent, and a lithium salt dissolved in the nonaqueous organic solvent. The nonaqueous organic solvent includes a dicyano ester compound of a structure shown by Formula I, Formula II, or Formula III. Formula I represents dicyano carbonate ester compounds, Formula II represents dicyano sulfite ester compounds, Formula III represents dicyano sulfate ester compounds, and the value n is an integer between 1 and 4. The lithium ion secondary battery according to the present disclosure includes the aforementioned electrolyte solution. At a working voltage of 4.3 V or higher, the lithium ion secondary battery according to the present disclosure can effectively suppress the oxidation of the electrolyte solution and improve the storage performance of the lithium ion secondary battery at high temperature.

Abstract: The present disclosure provides a lithium-ion secondary battery and an electrolyte thereof. The electrolyte of the lithium-ion secondary battery comprises a lithium salt; a non-aqueous solvent and an additive. The additive comprises a first additive and a second additive, the first additive is 1,3-propane sultone (PS), the second additive is 4-methylene-1,3-dioxolan-2-one and its derivatives with a structural formula 1 and/or 4,5-dimethylene-1,3-dioxolan-2-one and its derivatives with a structural formula 2; in the structural formula 1 and the structural formula 2, R1, R2, R3 and R4 each are hydrogen, halogen, C1˜C3 alkyl or halogenated alkyl; a weight percentage of the first additive in the electrolyte is 0.3%-4.0%, a weight percentage of the second additive in the electrolyte is 0.3%-4.0%. The lithium-ion secondary battery comprises the aforementioned electrolyte. The lithium-ion secondary battery of the present disclosure has better low temperature discharging performance.

Abstract: The present disclosure provides a lithium-ion secondary battery and an electrolyte thereof. The electrolyte comprises a lithium salt; a non-aqueous solvent and an additive comprising a first additive and a second additive, the first additive comprises at least one of vinylene carbonate and vinyl ethylene carbonate, the second additive is 4-methylene-1,3-dioxolan-2-one and its derivatives with a structural formula 1 and/or 4,5-dimethylene-1,3-dioxolan-2-one and its derivatives with a structural formula 2; in the structural formula 1 and the structural formula 2, R1, R2, R3 and R4 each are hydrogen, halogen, C1˜C3 alkyl or halogenated alkyl; a weight percentage of the first additive in the electrolyte is 0.2%˜2.0%, a weight percentage of the second additive in the electrolyte is 0.3%˜4.0%. The lithium-ion secondary battery comprises the aforementioned electrolyte.

Abstract: A lithium-ion battery, comprises an anode plate, a cathode plate, a separator and electrolyte, wherein the separator is arranged between the anode plate and the cathode plate. The anode plate comprises an anode current collector and an anode active material layer. The anode current collector is provided with an anode coating area and an anode blank area, and the anode active material layer is coated on the anode coating area. The cathode plate comprises a cathode current collector and a cathode active material layer. The cathode current collector is provided with a cathode coating area and a cathode blank area, and the cathode active material layer is coated on the cathode coating area. When both the anode blank area and the cathode blank area are coated with a polymer layer, the two polymer layers are mutually contacted.

Abstract: The present disclosure provides a lithium-ion secondary battery and an electrolyte thereof. The electrolyte comprises a lithium salt, a non-aqueous solvent, and an additive at least containing 1,3-propyl sultone (PS) and a compound of isocyanurate structure represented by formula (1), formula (2) or formula (3); in formula (1), n is a positive integer from 1 to 3; in formula (2), n is a positive integer from 1 to 3, R1 is an alkyl of linear chain or branched chain having carbon atoms from 1 to 6, hydrogen atoms in the alkyl can be substituted by fluorine atoms partly or wholly; in formula (3), n is a positive integer from 1 to 3, R1 and R2 are alkyls of linear chain or branched chain having carbon atoms from 1 to 6, hydrogen atoms in the alkyls can be substituted by fluorine atoms partly or wholly.