National key research and development program of "new energy vehicles" key project 2016 annual project "high energy-power lithium-ion battery development and industrialization of technology research" in high nickel cathode material research and development made a breakthrough.
In the first stage, the project R & D team solved the technical problem of low specific discharge capacity and low initial efficiency of high-nickel materials by combining basic formulation experiments. Combined with precursor controlled crystallization synthesis technology, secondary solid-phase synthesis technology with oxygen-enriched atmosphere and formulation adjustment , Coating technology and other key technologies to improve the oxidation of Ni2 + to Ni3 +, reduce the contact between the surface of the material and the electrolyte and reduce the amount of residual Li on the surface of the material. Without increasing the Ni content, the initial discharge capacity of the high- ≥206mAh / g, the first effect ≥90%, tap density ≥2.1g / cm3, magnetic impurity content ≤40ppb, pH≤11.7, with a 20t / month pilot production line.
In the meantime, in view of the technical difficulties of the continuous gradient preparation of Ni, Co, Mn and the poor uniformity control of the three precursors, the project team used Ni, Co and Mn three solutions to prepare separately and precisely controlled the flow through the design program Into the reactor new ideas, design, production of 100 liters experimental device, the preparation of complete control procedures, the preparation process parameters are optimized to achieve the precursors of the three elements from the core to the shell by any curve continuous gradient distribution, which greatly reduced Due to the sudden change in the composition of the material in the volume effect, stress and other aspects of non-uniformity, reduce the particles in the charge and discharge microcracks, improve capacity retention. The method simultaneously improves batch homogeneity of the precursor, and the synthesized precursor is a secondary spherical structure, and the particle size and composition gradient distribution are controllable, and the tap density is higher than 1.8g / cm3.
The above results provide a good foundation for the development of high-capacity, long-life gradient high-nickel cathode materials for the composition and gradient design of high-nickel ternary materials.
Excavator Cylinder Piston Rod Seals
Installation and application of piston rod seal for excavator hydraulic cylinder
The installation and application of hydraulic cylinder piston rod seals in excavators mainly include the following aspects:
1. Applying lubricating oil: Before installing the seal, the surface of the piston rod must be coated with lubricating oil to facilitate the installation and use of the seal.
2. Install the seal: Install the seal on the piston rod in sequence, taking care not to pinch or bend the seal.
3. Pressing the seal: After installing the seal, special tools need to be used to press the seal tightly to ensure its tightness and stability.
4. Check the sealing effect: After installing the sealing element, it is necessary to check the sealing effect. It can be detected by observing the working status of the hydraulic cylinder or using tools such as leak detectors.
5. Application scenario: The piston rod seal of excavator hydraulic cylinder is mainly used in the hydraulic system of construction machinery such as excavators, loaders, and bulldozers to prevent hydraulic oil leakage and ensure the normal operation of the machine.
In summary, the installation and application of hydraulic cylinder piston rod seals in excavators is a very important part of the hydraulic system, and must be strictly operated in accordance with regulations to ensure the normal operation and safety of the machine.
Excavator hydraulic cylinder piston rod seal, hydraulic cylinder piston seal, sealing kit
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