Contemporary Amperex Technology Co., Ltd.

Contemporary Amperex Technology (hong Kong) Limited

Contemporary Amperex Technology Co., Limted

Contemporary Amperex Technology Limited

Chunhua Hu

Yao Jiang

Chengdu Liang

Tiancheng Yi

Shushi Dou

Jinhua He

Qi Wu

Bin Deng

Lu Miao

Zijun Xu

Yingjie Zhan

Li Hao

Jian Yan

This application discloses a positive electrode active material, including bulk particles and a coating layer applied on an exterior surface of each of the bulk particles, where the bulk particle includes a lithium composite oxide that contains element nickel and a doping element M, and the coating layer includes an oxide of element M. When the positive electrode active material is in a 11% delithiated state, average valences of element Mand Mare αand β, respectively; when the positive electrode active material is in a 78% delithiated state, average valences of element Mand Mare αand β, respectively; and α>α, β=β. Element Mincludes one or more of Si, Ti, Cr, Mo, V, Se, Nb, Ru, Rh, Pd, Sb, Te, Ce, and W, and element Mis selected from one or more of Mg, Al, Ca, Zr, Zn, Y, and B.

Positive electrode active material and preparation method thereof, positive electrode plate, lithium-ion secondary battery, and apparatus containing such lithium-ion secondary battery

A positive electrode active material and a preparation method thereof, a positive electrode plate, a lithium-ion secondary battery, and a battery module, a battery pack, and apparatus containing the lithium-ion secondary battery are provided. The positive electrode active material includes secondary particles formed by agglomeration of primary particles, where the primary particles include a layered nickel-containing lithium composite oxide, and the nickel-containing lithium composite oxide includes a doping element; and when the positive electrode active material is charged from an 11% delithiated state to a 78% delithiated state at a rate of 0.1 C, a lattice of the primary particles has a maximum shrinkage rate satisfying Δa≤3.00% in an a-axis direction, and a maximum swelling rate satisfying Δc≤3.02% in a c-axis direction.

Positive electrode active material and preparation method thereof, positive electrode plate, lithium-ion secondary battery, and battery module, battery pack, and apparatus containing such lithium-ion secondary battery

A positive electrode active material and a preparation method thereof, a positive electrode plate, a lithium-ion secondary battery, and a battery module, battery pack, and apparatus containing such lithium-ion secondary battery are provided. The positive electrode active material includes matrix particles and a coating layer covering an exterior surface of the matrix particle, where the matrix particle includes a lithium nickel cobalt manganese oxide, and the coating layer includes an oxide of element M; the matrix particle is doped with element Mand element M, element Min the matrix particle is uniformly distributed, and element Min the matrix particle has a decreasing concentration from the exterior surface to a core of the matrix particle; and element Mand element Mare each independently selected from one or more of Mg, Al, Ca, Ba, Ti, Zr, Zn, and B, and element Mincludes one or more of Si, Ti, Cr, Mo, V, Ge, Se, Zr, Nb, Ru, Rh, Pd, Sb, Te, Ce, and W.

A lithium-ion battery and an apparatus. The lithium-ion battery includes an electrode assembly and an electrolytic solution. The electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a separation film A positive active material in the positive electrode sheet includes LiCoMOQ. A negative active material in the negative electrode sheet includes one or more of Si, SiO, a Si/C composite material, and a Si alloy. The electrolytic solution contains an additive A and an additive B, the additive A is a polynitrile six-membered nitrogen-heterocyclic compound with a relatively low oxidation potential, and the additive B is a halogen-substituted cyclic carbonate compound. The lithium-ion battery has superb cycle performance and storage performance, especially under high-temperature and high-voltage conditions.

Lithium-ion battery and apparatus

The present application provides a lithium-ion battery and an apparatus, the lithium-ion battery includes an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode sheet, a negative electrode sheet and a separation film. The positive active material in the positive electrode sheet includes LiCoMOQ, 0.5≤x1≤1.2, 0.8≤y1<1.0, 0≤z1≤0.1, and M is selected from one of Al, Ti, Zr, Y, and Mg, and Q is selected from one or more of F, Cl, and S. The electrolyte contains an additive A and an additive B, the additive A is a polynitrile six-membered nitrogen-heterocyclic compound with a relatively low oxidation potential, and the additive B is an aliphatic dinitrile or polynitrile compound with a relatively high oxidation potential. The lithium-ion battery of the present application has superb cycle performance and storage performance, especially under high-temperature and high-voltage conditions.

The present application provides a lithium-ion battery and an apparatus, and the lithium-ion battery includes an electrode assembly and an electrolytic solution, the electrode assembly includes a positive electrode sheet, a negative electrode sheet and a separation film. A positive active material of the positive electrode sheet includes LiCoMOQ, 0.5≤x1≤1.2, 0.85≤y1≤1.0, 0≤z1≤0.1 M is selected from one or more of Al, Ti, Zr, Y, and Mg, and Q is selected from one or more of F, Cl, and S. The electrolytic solution contains vinylene carbonate, fluoroethylene carbonate, 1,3-propane sultone, and an additive A. The additive A is a polynitrile six-membered nitrogen-heterocyclic compound with a relatively low oxidation potential. The lithium-ion battery has superb cycle performance and storage performance, especially under high-temperature and high-voltage conditions.

This application discloses a positive electrode active material, including secondary particles and a coating layer applied on an exterior surface of each of the secondary particles, where the secondary particle includes a lithium transition metal oxide that contains a doping element M, the coating layer includes an oxide of element M, Mis selected from one or more of Si, Ti, Cr, Mo, V, Ge, Se, Zr, Nb, Ru, Rh, Pd, Sb, Te, Ce, and W, and Mis selected from one or more of Mg, Al, Ca, Ce, Ti, Zr, Zn, Y, and B; a relative deviation of local mass concentration of element Min the secondary particle is less than 20%; and the secondary particle from the core to the exterior surface of the particle includes a plurality of layers of primary particles arranged along radial direction of the secondary particle.

The present application discloses a positive electrode active material including a lithium nickel cobalt manganese oxide, the molar content of nickel in the lithium nickel cobalt manganese oxide accounts for 60%-90% of the total molar content of nickel, cobalt and manganese, and the lithium nickel cobalt manganese oxide has a layered crystal structure of a space group Rm; a transition metal layer of the lithium nickel cobalt manganese oxide includes a doping element, and the local mass concentration of the doping element in particles of the positive electrode active material has a relative deviation of 20% or less; and in a differential scanning calorimetry spectrum of the positive electrode active material in a 78% delithiation state, an initial exothermic temperature of a main exothermic peak is 200&#xb0; C. or more, and an integral area of the main exothermic peak is 100 J/g or less.

Positive electrode active material, method for preparation thereof, positive electrode plate, lithium-ion secondary battery and related battery module, battery pack and apparatus

This application provides a lithium-ion battery and an apparatus. The lithium-ion battery includes an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode plate, a negative electrode plate, and a separator. A positive active material of the positive electrode plate includes LiCoMOQ, where 0.5&#x2264;x1&#x2264;1.2, 0.8&#x2264;y1&#x2264;1.0, 0&#x2264;z1&#x2264;0.1, M is selected from one or more of Al, Ti, Zr, Y, and Mg, and Q is selected from one or more of F, Cl, and S. The electrolyte contains an additive A that is a polynitrile six-membered nitrogen-heterocyclic compound with a relatively low oxidation potential. The lithium-ion battery has superb cycle performance and storage performance, especially under high-temperature and high-voltage conditions.

The present application discloses positive electrode active material, preparation method thereof, positive electrode plate, lithium-ion secondary battery and battery module, pack, and apparatus. The positive electrode active material includes a nickel-containing lithium composite oxide satisfying a chemical formula Li[NiCoMnM]O, in the formula, M is a doping element at transition metal site, 0.5&#x2264;x&#x3c;1, 0&#x2264;y&#x3c;0.3, 0&#x2264;z&#x3c;0.3, &#x2212;0.1&#x2264;a&#x3c;0.2, 0&#x3c;b&#x3c;0.3, x+y+z+b=1, wherein the positive electrode active material has a layered crystal structure and belongs to space group Rm; under the condition that the positive electrode active material is in 78% delithiation state, at least part of the doping elements M have a chemical valence of +3 or more, and surface oxygen of the positive electrode active material has an average valence state of Vsatisfying &#x2212;2.0&#x2264;V&#x2264;&#x2212;1.5.

Positive electrode active material, preparation method thereof, positive electrode plate, lithium-ion secondary battery as well as battery module, battery pack and apparatus containing lithium-ion secondary battery

The present application relates to the field of energy storage materials, and particularly, to an electrolytic solution and a battery using the electrolytic solution. The electrolytic solution of the present application contains an additive, the additive including a multi-cyano compound represented by formula (I). The multi-cyano compound of the present application has a stronger complexation with a transition metal on the surface of a positive electrode material, and therefore a protective film can be formed on the surface of the positive electrode material, and the dissolution of the transition metal is effectively suppressed; the surface activity of the positive electrode material is reduced, thereby suppressing side reactions, such as the decomposition of the electrolytic solution on the surface of the positive electrode material; and the cycle performance and storage performance of a battery under wide range of working voltage and wide range of operating temperature conditions are thus improved. 

Electrolyte solution including multi-cyano compound additive and battery including the same

Energy storage materials, and specifically, an electrolyte and an electrochemical device, where the electrolyte includes an additive A and an additive B, the additive A is selected from multi-cyano six-membered N-heterocyclic compounds represented by Formula I-1, Formula I-2 and Formula I-3, and combinations thereof, and the additive B is at least one sulfonate compound. The electrochemical device includes the above electrolyte. The electrolyte can effectively passivate surface activity of the positive electrode material, inhibit oxidation of the electrolyte, and effectively reduce gas production of the battery, meanwhile the electrolyte can be adsorbed on catalytically active sites of the graphite surface to form a stable SEI film, thereby effectively reducing side reactions. The electrochemical device using the electrolyte has good high temperature and high voltage cycle performance and storage performance. 

Electrolyte and electrochemical device

The present application provides a lithium-ion battery and an apparatus, and the lithium-ion battery includes an electrode assembly and an electrolytic solution, the electrode assembly includes a positive electrode sheet, a negative electrode sheet and a separation film. A positive active material of the positive electrode sheet includes LiCoMOQ, 0.5&#x2264;x1&#x2264;1.2, 0.8&#x2264;y1&#x2264;1.0, 0&#x2264;z1&#x2264;0.1, M is selected from one or more of Al, Ti, Zr, Y, and Mg, and Q is selected from one or more of F, Cl, and S. The electrolytic solution contains vinylene carbonate, fluoroethylene carbonate, 1,3-propane sultone, and an additive A. The additive A is a polynitrile six-membered nitrogen-heterocyclic compound with a relatively low oxidation potential. The lithium-ion battery has superb cycle performance and storage performance, especially under high-temperature and high-voltage conditions.

The present application provides a lithium-ion battery and an apparatus, the lithium-ion battery includes an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode sheet, a negative electrode sheet and a separation film. The positive active material in the positive electrode sheet includes LiCoMOQ, 0.5&#x2264;x1&#x2264;1.2, 0.8&#x2264;y1&#x3c;1.0, 0&#x2264;z1&#x2264;0.1, and M is selected from one of Al, Ti, Zr, Y, and Mg, and Q is selected from one or more of F, Cl, and S. The electrolyte contains an additive A and an additive B, the additive A is a polynitrile six-membered nitrogen-heterocyclic compound with a relatively low oxidation potential, and the additive B is an aliphatic dinitrile or polynitrile compound with a relatively high oxidation potential. The lithium-ion battery of the present application has superb cycle performance and storage performance, especially under high-temperature and high-voltage conditions.

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Ningde, China

Chunhua Hu