Ningde Amperex Technology Limited

Chunrui Xu

Jianming Zheng

Shuirong Zhang

Wenqiang Li

Chao Tang

Juan Ma

Hengtao Xia

Yanyan Xu

Wentao Ma

A battery includes an electrode assembly, an electrolytic solution, a package accommodating the electrode assembly, a first tab, a second tab, and a first filler. The electrode assembly is formed by winding a first electrode plate and a second electrode plate stacked. The first current collector includes a first blank region, a first single-surface-coated region, and a first double-surface-coated region. The first blank region includes a first planar region and a first bent region. The first single-surface-coated region includes a second bent region and a second planar region. The first tab is disposed in the first planar region. The second tab is disposed on the second electrode plate. The first filler is disposed in the first planar region or the second planar region. Projections of the first filler, the first tab, and the second tab in a thickness direction of the electrode assembly do not overlap.

Battery

An electrochemical apparatus including a positive electrode, a negative electrode, an electrolyte, and a separator. The positive electrode includes a positive electrode current collector and a positive active material layer disposed on the positive current collector. An X-ray photoelectron spectroscopy of the positive active material layer has a peak at 164 eV to 175 eV. The electrolyte has a retention capability of 1.0 g/Ah to 4.0 g/Ah. The electrolyte improves cycle performance, over-discharge storage performance, and safety performance of the electrochemical apparatus.

Electrolyte and electrochemical apparatus

The present application relates to an electrolytic solution and an electrochemical device using same. The electrolytic solution of the present application comprises a compound containing a &#x2014;CN functional group and a compound containing a P&#x2014;O bond. By introducing the compound containing a &#x2014;CN functional group and the compound containing a P&#x2014;O bond into the electrolytic solution, an active material can be better protected, thereby effectively improving floatation performance and nailing performance of a battery, and cycle impedance of the battery.

Electrolyte solution and electrochemical device using the same

The present application relates to an electrolyte, an electrochemical device and an electronic device comprising the same. The electrolyte of the present application includes a cyclic N-containing sulfonyl-compound and at least one of vinylene carbonate, fluoroethylene carbonate, lithium tetrafluoroborate, lithium difluoro(oxalato)borate or lithium difluorophosphate. The electrolyte of the present application may further include a sulfur-oxygen double bond containing compound and a silicon-containing carbonate. Compared with the prior art, using the electrolyte provided by the present application can effectively improve the high-temperature storage, cycle performance and overcharge performance of an electrochemical device, such as a lithium-ion battery.

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Ningde, China

Chunrui Xu