Contemporary Amperex Technology Co., Ltd.

Contemporary Amperex Technology (hong Kong) Limited

Contemporary Amperex Technology Limited

Xiaomei Liu

Jiang Liu

Guobao Wang

Xiang Zhou

Yao Jiang

Yongshou Lin

Baiqing Li

Limei Yang

Longfei Yang

Fenggang Zhao

Bin Xie

Xianfeng Zheng

Hong Wang

Fan Wang

Yichen Wu

Bin Yao

Qing Xia

Bo Li

Yonggang Xu

Guopeng Teng

Ruifa Li

Shipeng Li

Zhenwei Liu

The present application relates to a positive electrode lithium replenishment material, and a preparation method thereof. The positive electrode lithium replenishment material, includes a first lithium-containing compound selected from one or more of compounds whose chemical formula is denoted by Formula I, LiA, 0<x, y≤3. An outer layer of the positive electrode lithium replenishment material includes a second lithium-containing compound. An activity of reacting with water by the second lithium-containing compound is lower than that by the first lithium-containing compound. The positive electrode lithium replenishment material can effectively prevent a gelling phenomenon in a slurry preparation process, and slow down inactivation of the lithium replenishment material caused by a reaction between the electrode plate with moisture and carbon dioxide in the air during storage of the electrode plate, thereby increasing manufacturability of lithium-ion batteries replenished with lithium, and improving the electrochemical performance of the lithium-ion batteries.

Positive electrode lithium replenishment material, preparation method and uses thereof

An electrode assembly and a lithium-ion battery are described. The electrode assembly includes a positive electrode plate, a separator, and a negative electrode plate, where the negative electrode plate includes a negative electrode current collector and a negative electrode active substance layer, the negative electrode plate further includes a lithium metal layer, the lithium metal layer is formed by a plurality of regular or irregular strip-shaped lithium-rich regions, and the plurality of lithium-rich regions present a discontinuous pattern of spaced distribution in a length direction of the negative electrode plate. The electrode assembly further satisfies that: negative electrode capacity per unit area/positive electrode capacity per unit area=1.2 to 2.1 and negative electrode capacity per unit area/(positive electrode capacity per unit area+capacity of the lithium metal layer on the surface of the negative electrode active substance layer per unit area× 80%)≥ 1.10.

Electrode assembly and lithium-ion battery

A lithium-ion secondary battery includes a negative electrode sheet including a negative electrode current collector and a negative electrode film disposed on a surface of the negative electrode current collector and containing a negative active material, a positive electrode sheet including a positive electrode current collector and a positive electrode film disposed on a surface of the positive electrode current collector and containing a positive active material, and an electrolytic solution including lithium iodide, a lithium salt, a solvent, and an additive. A coating weight per unit area, CW/S, of the positive electrode film satisfies CW/S=((CW/S)×b×C/CB−m×X×(199 mAh/g)/S)/(C×a).

Lithium-ion secondary battery, battery module, battery pack, and power consumption apparatus

A novel positive electrode sheet, a secondary battery, a battery module, a battery pack and an electrical apparatus are described. The positive electrode sheet includes a positive electrode current collector and a positive electrode film layer with a single-layer structure or a multi-layer structure. When the positive electrode film layer is a single-layer structure, at least one of the positive electrode film layers comprises a first positive electrode active material and a second positive electrode active material; and/or, when the positive electrode film layer is a multi-layer structure, at least one layer of at least one of the positive electrode film layers comprises a first positive electrode active material and a second positive electrode active materials. The first positive electrode active material includes an inner core, a first cladding layer comprising crystalline pyrophosphates, a second cladding layer comprising crystalline phosphate, and a third cladding layer.

Positive electrode sheet, secondary battery, battery module, battery pack, and electrical apparatus

A positive electrode sheet may comprise a positive electrode current collector and a positive electrode film layer having a single-layer structure or a multi-layer structure provided on at least one surface thereof; when the positive electrode film layer is of a single-layer structure, at least one positive electrode film layer may comprise both a first positive electrode active material and a second positive electrode active material; and/or, when the positive electrode film layer is of a multi-layer structure, at least one layer of the at least one positive electrode film layer may comprise both a first positive electrode active material and a second positive electrode active material; the first positive electrode active material may comprises an inner core containing LiMnAPRO, a first coating layer containing pyrophosphate MPOand phosphate XPOand covering the inner core, and a second coating layer containing carbon element and covering the first coating layer.

Positive electrode sheet, secondary battery, battery module, battery pack and electrical apparatus

The present application discloses a wound electrode assembly, wherein the negative electrode plate thereof includes a negative electrode current collector and a negative active material layer which includes a negative active material disposed on two opposite surfaces of the negative electrode current collector; and the two negative active material layers respectively include active an material layer in an unpaired region and an active material layer in a paired region distributed successively in the length direction of the negative electrode plate, and two active material layers in the unpaired regions are arranged at both ends in the length direction of the negative electrode plate, and a first metallic lithium layer is disposed on the surface of one or both of the active material layers in the unpaired regions, so that to form a first lithium pre-intercalation compound in either or both of the active material layers in the unpaired regions.

Wound electrode assembly, lithium-ion secondary battery and negative electrode plate

The present disclosure provides a lithium-rich negative electrode plate, an electrode assembly and a lithium-ion battery, the lithium-rich negative electrode plate comprises a negative electrode collector and a negative electrode film, the negative electrode film is provided on a surface of the negative electrode collector and comprises a negative electrode active material, the lithium-rich negative electrode plate further comprises a layer of lithium metal provided on a surface of the negative electrode film. The negative electrode film further comprises a cyclic ester which is capable of forming a film on the negative electrode plate, a dielectric constant of the cyclic ester is larger than or equal to 10, and a reduction potential of the cyclic ester relative to Li/Liis lower than or equal to 1.5V.

Lithium-rich negative electrode plate, electrode assembly and lithium-ion battery

The present disclosure provides a battery and method for preparing the same. The battery includes a cell and an electrolyte; the cell includes a positive electrode plate, a negative electrode plate and a separator. Wherein in the battery, at least one surface of the positive electrode film and/or the negative electrode film is provided with protrusions, with a proviso that: 0.3&#x2264;(T+T)/(H+H)&#x2264;1; wherein Tis a height of the protrusions provided on the at least one surface of the positive electrode film, Tis a height of the protrusions provided on the at least one surface of the negative electrode film, His a thickness increase of the positive electrode film when the battery has a 100% SOC, His a thickness increase of the negative electrode film when the battery has a 100% SOC.

Battery and method for preparing the same

The present disclosure provides a lithium-ion battery comprising an electrode assembly, an electrolyte and a case. The electrolyte comprises a lithium salt and an organic solvent which comprises a cyclic ester, a mass of the cyclic ester is equal to or less than 10% of a total mass of the organic solvent. A negative electrode active material at least comprises a carbon-based negative electrode material which in the negative electrode film exists in a form of a pre-lithium-intercalation compound LiCformed by lithiation with a lithium metal, 12&#x2264;x&#x2264;150; a capacity of the negative electrode active material per unit area/(a capacity of the positive electrode active material per unit area+a capacity of active lithium ions of the pre-lithium-intercalation compound LiCwhich can be intercalated and deintercalated in the negative electrode film per unit area)&#x2265;

Lithium-ion battery

The present invention provides a power battery and a positive electrode plate thereof. The positive electrode plate includes a positive current collector and a positive active material layer formed on the positive current collector. The positive active material layer contains a mixture of lithium iron phosphate and FeF, or a mixture of lithium iron phosphate and LiFeF, or a mixture of lithium iron phosphate, FeFand LiFeF. FeFor LiFeFhas a high gram capacity of more than 200 mAh/g and has a charge and discharge interval close to that of lithium iron phosphate, which can improve the energy density and the safety performance of the power battery.

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Ningde, China

Xiaomei Liu