Abstract: The present disclosure belongs to the technical field of lithium battery cathode materials, and discloses a preparation method of multiple carbon-coated high-compaction lithium iron manganese phosphate, comprising the following steps: (1) synthesizing a carbon and vanadium co-doped ferromanganese phosphate precursor through a co-precipitation method, sintering, and removing crystal water to obtain an anhydrous ferromanganese phosphate precursor; (2) adding lithium phosphate, a supplemental phosphorus source, an organic carbon source, a dopant and deionized water, and performing ball milling, wet sanding, spray drying and sintering to obtain an intermediate material; and (3) adding deionized water and the organic carbon source, then performing ball milling, sanding, spray drying, sintering and air jet pulverization to obtain multiple carbon-coated high-compaction lithium iron manganese phosphate.

Abstract: This disclosure provides methods and apparatus for more quickly and reliably reestablishing short range wireless connections between a wireless computing device and paired peripheral devices after one or more processing units of the wireless computing device exit a low power state. An example method includes, prior to the one or more processing units entering the low power state, placing a short range wireless module of the wireless computing device into a known state, and then while exiting the low power state, scheduling an event notification to prevent the short range wireless module from communicating with the one or more processing units before the one or more processing units have fully exiting the low power stat.

Abstract: The present disclosure belongs to the technical field of lithium battery cathode materials, and discloses a preparation method of multiple carbon-coated high-compaction lithium iron manganese phosphate, comprising the following steps: (1) synthesizing a carbon and vanadium co-doped ferromanganese phosphate precursor through a co-precipitation method, sintering, and removing crystal water to obtain an anhydrous ferromanganese phosphate precursor; (2) adding lithium phosphate, a supplemental phosphorus source, an organic carbon source, a dopant and deionized water, and performing ball milling, wet sanding, spray drying and sintering to obtain an intermediate material; and (3) adding deionized water and the organic carbon source, then performing ball milling, sanding, spray drying, sintering and air jet pulverization to obtain multiple carbon-coated high-compaction lithium iron manganese phosphate.

Abstract: Embodiments of the present invention disclose a fuel cell control method. The method includes: obtaining a current output power of a fuel cell; obtaining a current inlet-outlet temperature difference of a fuel cell stack, where the current inlet-outlet temperature difference of the stack is a difference between a stack temperature and an ambient temperature; controlling a hydrogen exhaust solenoid valve according to the output power and working parameters of the hydrogen exhaust solenoid valve corresponding to the output power; and controlling the stack temperature according to the output power and the current inlet-outlet temperature difference of the stack, so that the amount of water generated in the fuel cell is equal to the amount of water discharged. In the embodiments, the fuel cell can work in a preferred state, steady output of the cell is ensured, and the service life is improved.