Abstract: The present application provides a secondary battery, a battery module, a battery pack and an electrical device containing the same. The secondary battery comprises a positive electrode plate, and a non-aqueous electrolytic solution, wherein the positive electrode plate comprises a positive electrode active material with a core-shell structure, which comprises a core and a shell covering the core, in which the core has a chemical formula of Li1+xMn1-yAyP1-zRzO4, and the shell comprises a first cladding layer covering the core, a second cladding layer covering the first cladding layer and a third cladding layer covering the second cladding layer, and the non-aqueous electrolytic solution comprises a first additive comprising one or more of the compounds shown in Formula 1. The present application enables the secondary battery to simultaneously have high energy density with good rate performance, cycling performance, storage performance and safety performance.

Abstract: This application provides a secondary battery. A negative active material thereof includes a graphite material. A non-aqueous electrolyte thereof includes chain carboxylate. An OI value of a negative electrode plate, a resistance value R of the negative electrode plate, and a mass percent W0 of a first solvent in a solvent satisfy 0.08/m??W0×100/(R×OI)?5/m?, where the OI value means a ratio of an intensity of a 004 crystal plane diffraction peak to an intensity of a 110 crystal plane diffraction peak of the graphite material, and R is in units of m?.

Abstract: Provided are a lithium secondary battery and an electric apparatus. The lithium secondary battery includes: a negative electrode plate, where the negative electrode plate includes a negative electrode current collector and a negative electrode active material layer disposed on at least one side of the negative electrode current collector, and a porosity of the negative electrode active material layer is P; and an electrolyte, where the electrolyte includes a solvent, the solvent includes at least one of compounds represented by the following formula (I), and a mass fraction of the compound represented by formula (I) in the solvent is W1, W1 and P satisfying 0.65?W1/P?4.4; where R1 and R2 each independently include at least one of an alkyl group having 1 to 3 carbon atoms and a halogenated alkyl group having 1 to 3 carbon atoms.

Abstract: This application relates to a lithium-ion battery having a cell group margin A of 88%-97% and including a non-aqueous electrolyte. The non-aqueous electrolyte includes one or more first organic solvents with a specified structure. Based on a total mass of an organic solvent in the non-aqueous electrolyte, a mass percentage of the first organic solvent is X1, X1 being in a range of 20%-80%, and the cell group margin A and the mass percentage X1 of the first organic solvent satisfy a specified relation: 0.22?X1/A?0.91. This application further relates to an electric apparatus including the lithium-ion battery.

Abstract: A secondary battery, a battery module, a battery pack, and an electric apparatus are provided. The secondary battery includes a positive electrode plate and a non-aqueous electrolyte. The positive electrode plate includes a positive electrode active material, the positive electrode active material including a core and a shell enveloping the core, where the core contains Li1+xMn1-yAyP1-zRzO4, and the shell includes a first coating layer enveloping the core and a second coating layer enveloping the first coating layer. The first coating layer includes a pyrophosphate MP2O7 and a phosphate XPO4, where M and X each are one or more independently selected from Li, Fe, Ni, Mg, Co, Cu, Zn, Ti, Ag, Zr, Nb, or Al; and the second coating layer contains carbon.

Abstract: The present application provides a secondary battery, and providing a battery module, a battery pack, and a powder device comprising the same. The secondary battery includes a positive electrode plate and a non-aqueous electrolytic solution, in which the positive electrode plate includes a positive electrode active material having a core-shell structure, the positive electrode active material includes an core and a shell covering the core, the core includes Li1+xMn1?yAyP1?zRzO4, the shell includes a first coating layer covering the core and a second coating layer covering the first coating layer, the non-aqueous electrolytic solution includes a first additive one or more selected from the compounds shown in formulae 1-A to 1-D. The secondary battery of the present application can have a relatively high energy density, and also a good rate performance, cycling performance, storage performance and safety performance.

Abstract: Provided are a secondary battery, a battery module, a battery pack, and an electrical apparatus. The secondary battery comprises a positive electrode plate and a non-aqueous electrolyte solution, where the positive electrode plate comprises a positive electrode active material having a core-shell structure and comprising an inner core and a shell cladding the inner core, where the inner core has a chemical formula of Li1+xMn1?yAyP1?zRzO4, a first cladding layer comprises crystalline pyrophosphates LiaMP2O7 and/or Mb(P2O7)c, a second cladding layer comprises a crystalline phosphate XPO4, and a third cladding layer is carbon; and the non-aqueous electrolyte solution comprises a first additive comprising one or more compounds in the group consisting of a compound represented by formula 1, a compound represented by formula 2, and a compound represented by formula 3, thereby improving rate performance, cycling performance, and high-temperature stability of a lithium manganese phosphate secondary battery.

Abstract: This application provides a secondary battery, a battery module, a battery pack, and an electric apparatus. The secondary battery includes a positive electrode plate and a non-aqueous electrolyte, where a positive electrode active material includes a core and a shell enveloping the core, the core including Li1+xMn1-yAyP1-zRzO4 and the shell including a first coating layer enveloping the core and a second coating layer enveloping the first coating layer, where the first coating layer includes a pyrophosphate MP2O7 and a phosphate XPO4, and the second coating layer includes carbon; and the non-aqueous electrolyte includes a first additive, the first additive including one or more from a group consisting of compounds shown in formula 1 and compounds shown in formula 2.

Abstract: A secondary battery includes a positive electrode plate and a non-aqueous electrolyte. The positive electrode plate includes a positive electrode active material including a core and a shell enveloping the core. A chemical formula of the core is Li1+xMn1?yAyP1?zRzO4, where the first coating layer includes a crystalline pyrophosphate LiaMP2O7 and/or Mb(P2O7)c, the second coating layer includes a crystalline phosphate XPO4, and the third coating layer is carbon. The non-aqueous electrolyte includes a first additive including one or more selected from a group consisting of compounds represented by formula 1 and compounds represented by formula 2.

Abstract: Provided are a secondary battery, a battery module, a battery pack and an electrical apparatus. The secondary battery includes a positive electrode plate and a non-aqueous electrolyte solution. A positive electrode active material includes an inner core and a shell cladding the inner core. The inner core includes Li1+xMn1?yAyP1?zRzO4. The shell includes a first cladding layer cladding the inner core and a second cladding layer cladding the first cladding layer. The first cladding layer includes pyrophosphate MP2O7 and phosphate XPO4. The second cladding layer includes carbon. The non-aqueous electrolyte solution includes a first additive. The first additive includes one or more compounds in a group consisting of a compound shown in Formula 1, a compound shown in Formula 2 and a compound shown in Formula 3. The rate performance, cycling performance and high temperature stability of a lithium manganese phosphate secondary battery are increased.

Abstract: The present application provides a secondary battery and a battery module, battery pack and electrical device containing the same. The secondary battery comprises a positive electrode plate and an non-aqueous electrolytic solution, wherein the positive electrode plate comprises a positive electrode active material with a core-shell structure, said positive electrode active material comprising an core and a shell covering said core, said core comprises Li1+xMn1?yAyP1?zRzO4; said shell comprises a first cladding layer covering said core and a second cladding layer covering said first cladding layer, said non-aqueous electrolytic solution comprises a first additive, said first additive comprises one or more of compounds as shown by Formula 1, Formula 2 and Formula 3. The present application enables the secondary battery to have higher energy density while having good rate performance, cycle performance, storage performance and safety performance.

Abstract: The present application provides a secondary battery, a battery module, a battery pack and an electrical device containing the same. The secondary battery comprises a positive electrode plate, and a non-aqueous electrolytic solution, wherein the positive electrode plate comprises a positive electrode active material with a core-shell structure, and the positive electrode active material comprises a core and a shell covering the core, the core comprises Li1+xMn1?yAyP1?zRzO4, the shell comprises a first cladding layer covering the core and a second cladding layer covering the first cladding layer, and the non-aqueous electrolytic solution comprises a first additive comprising one or more of the compounds shown in Formula 1. The present application enables the secondary battery to simultaneously have high energy density with good rate performance, cycling performance, storage performance and safety performance.

Abstract: This application provides a secondary battery, and providing a battery module, a battery pack, and a powder device comprising the same. The secondary battery includes a positive electrode plate and a non-aqueous electrolytic solution, in which the positive electrode plate includes a positive electrode active material having a core-shell structure, said positive electrode active material includes an inner core and a shell covering the core, said core has a chemical formula of Li1+xMn1-yAyP1-zRzO4, said shell includes a first coating layer covering said core, a second coating layer covering said first coating layer, and a third coating layer covering said second coating layer. The secondary battery of the present application can have a relatively high energy density, and also a good rate performance, cycling performance, storage performance and safety performance.

Abstract: A secondary battery, a battery module, a battery pack, and an electric apparatus are described. The secondary battery includes a positive electrode plate and a non-aqueous electrolyte. The positive electrode plate includes a positive electrode active material. The positive electrode active material has a chemical formula of LiaAxMn1?yByP1?zCzO4?nDn, where A includes at least one of Zn, Al, Na, K, Mg, Nb, Mo, and W, B includes at least one of Ti, V, Zr, Fe, Ni, Mg, Co, Ga, Sn, Sb, Nb, and Ge, C includes at least one of B (boron), S, Si, and N, and D includes at least one of S, F, Cl, and Br. The non-aqueous electrolyte includes an organic solvent. The organic solvent includes a first solvent. The first solvent includes one or more of compounds represented by formula 1. Rate performance and cycling performance of the secondary battery are improved.

Abstract: Provided are a secondary battery, a battery module, a battery pack, and an electrical apparatus. The secondary battery comprises a positive electrode plate and a non-aqueous electrolyte solution, where the positive electrode plate comprises a positive electrode active material having a core-shell structure and comprising an inner core and a shell cladding the inner core, where the inner core has a chemical formula of Li1+xMn1?yAyP1?zRzO4, a first cladding layer comprises crystalline pyrophosphates LiaMP2O7 and/or Mb(P2O7)c, a second cladding layer comprises a crystalline phosphate XPO4, and a third cladding layer is carbon; and the non-aqueous electrolyte solution comprises a first additive comprising one or more compounds in the group consisting of a compound represented by formula 1, a compound represented by formula 2, and a compound represented by formula 3, thereby improving rate performance, cycling performance, and high-temperature stability of a lithium manganese phosphate secondary battery.

Abstract: Provided are a secondary battery, a battery module, a battery pack and an electrical apparatus. The secondary battery includes a positive electrode plate and a non-aqueous electrolyte solution. A positive electrode active material includes an inner core and a shell cladding the inner core. The inner core includes Li1+xMn1?yAyP1?zRzO4. The shell includes a first cladding layer cladding the inner core and a second cladding layer cladding the first cladding layer. The first cladding layer includes pyrophosphate MP2O7 and phosphate XPO4. The second cladding layer includes carbon. The non-aqueous electrolyte solution includes a first additive. The first additive includes one or more compounds in a group consisting of a compound shown in Formula 1, a compound shown in Formula 2 and a compound shown in Formula 3. The rate performance, cycling performance and high temperature stability of a lithium manganese phosphate secondary battery are increased.

Abstract: The present application provides a secondary battery and a battery module, battery pack and electrical device containing the same. The secondary battery comprises a positive electrode plate and an non-aqueous electrolytic solution, wherein the positive electrode plate comprises a positive electrode active material with a core-shell structure, said positive electrode active material comprising an core and a shell covering said core, said core has a chemical formula of Li1+xMn1-yAyP1-zRzO4; said shell comprises a first cladding layer covering said core, a second cladding layer covering said first cladding layer and a third cladding layer covering said second cladding layer, said non-aqueous electrolytic solution comprises a first additive, said first additive comprises one or more of compounds as shown by Formula 1, Formula 2 and Formula 3.

Abstract: A secondary battery includes a positive electrode plate and a non-aqueous electrolyte. The positive electrode plate includes a positive electrode active material including a core and a shell enveloping the core. A chemical formula of the core is Li1+xMn1?yAyP1?zRzO4, where the first coating layer includes a crystalline pyrophosphate LiaMP2O7 and/or Mb(P2O7)c, the second coating layer includes a crystalline phosphate XPO4, and the third coating layer is carbon. The non-aqueous electrolyte includes a first additive including one or more selected from a group consisting of compounds represented by formula 1 and compounds represented by formula 2.

Abstract: The present application provides a secondary battery and a battery module, battery pack and electrical device containing the same. The secondary battery comprises a positive electrode plate and an non-aqueous electrolytic solution, wherein the positive electrode plate comprises a positive electrode active material with a core-shell structure, said positive electrode active material comprising an core and a shell covering said core, said core has a chemical formula of Li1+xMn1-yAyP1-zRzO4; said shell comprises a first cladding layer covering said core, a second cladding layer covering said first cladding layer and a third cladding layer covering said second cladding layer, said non-aqueous electrolytic solution comprises a first additive, said first additive comprises one or more of compounds as shown by Formula 1, Formula 2 and Formula 3.

Abstract: This application provides a secondary battery, a battery module, a battery pack, and an electric apparatus. The secondary battery includes a positive electrode plate and a non-aqueous electrolyte. The positive electrode plate includes a positive electrode active material having a core-shell structure, the positive electrode active material including a core and a shell enveloping the core. A chemical formula of the core is Li1+xMn1?yAyP1-zRzO4. A is one or more elements selected from Zn, Al, Na, K, Mg, Mo, W, Ti, V, Zr, Fe, Ni, Co, Ga, Sn, Sb, Nb and Ge. R is one or more elements selected from B, Si, N, and S. The first coating layer includes a crystalline pyrophosphate LiaMP2O7 and/or Mb(P2O7)c. The second coating layer includes a crystalline phosphate XPO4. The third coating layer is carbon. The non-aqueous electrolyte includes a first solvent, the first solvent including one or more of the compounds represented by formula 1.