34results about How to "Improve high temperature cycle life" patented technology

The invention belongs to the technical field of lithium ion batteries, and specifically relates to a high-energy-density ternary NCA battery and a preparation method thereof; the high-energy-density ternary NCA battery includes a positive electrode material, a negative electrode material and an electrolyte, and the high-energy The preparation method of the density ternary NCA battery includes the following steps: 1) preparation of the positive electrode sheet; 2) preparation of the negative electrode sheet; 3) preparation of the electrolyte; 4) production of the finished battery; the improvement of the negative electrode material will increase the coating uniformity High quality and high density, will not cause local cracks in the cycle, inhibit the appearance of new surfaces, reduce side reactions, reduce the formation of new SEI films, improve the effective use of silicon, and achieve a stable material structure with ternary NCA cathode materials , improve its normal temperature, high temperature cycle performance and thermal stability; at the same time, add positive electrode surface protection agent, lithium hexafluorophosphate stabilizer and negative electrode SEI film forming additive to the electrolyte to improve battery safety and high temperature cycle life.

The invention provides a positive pole material for a lithium ion battery. The positive pole material comprises positive pole active substances, a conductive agent and a binding agent, wherein the positive pole active substances comprise lithium cobalt oxide and lithium manganate; and the relative intensity of a 311 peak in an XRD spectrum of the lithium manganate is less than 60 percent. The invention also provides a positive pole for the lithium ion battery by using the positive pole material and a lithium ion battery comprising the positive pole. Because the positive pole material comprises the lithium manganate of which the relative intensity of the 311 peak in the XRD spectrum of the lithium manganate is less than 60 percent, the usage amount of the lithium manganate can be up to 60 weight percent of the total weight of the positive pole active substances so as to greatly reduce the manufacturing cost of a battery and improve high-temperature performance of the battery. Simultaneously, the lithium ion battery comprising the lithium ion battery positive pole material has the advantage of long high-temperature cycle life.

The invention provides a temperature-controlled and pressure-controlled formation method of a lithium-ion battery, which includes injecting liquid and forming the assembled battery under controlled temperature and pressure. The temperature-controlled and pressure-controlled formation method includes low-pressure formation and normal temperature formation. As well as multi-stage formation processes such as high-temperature formation, the lithium-ion battery obtained through the method has good cycle life and high-temperature stability.