LITHIUM-IRON-PHOSPHATE-BASED BATTERIES: MATERIALS, PROCESSES, CHARACTERISTICS AND PRODUCTION EXPERIENCE IN RUSSIA

Abstract

The paper analyses the establishment of mass production of lithium-iron-phosphate-based batteries in Liotech Co., Ltd. (Novosibirsk) and studies the electrochemical characteristics of LT-LFP 300 model of batteries. Irreversible capacity for the batteries in the first (formation) cycle was the permissible value of 16.8%. The increase in normalized discharge current within 0.2 to 1.5 С interval had only little effect on the discharge capacity of LT-LFP 300. The discharge capacity of the batteries was virtually unchanged within the temperature range 0 о C to +50 о C while it reasonable declined with temperature decrease below 0 o C. Nevertheless, the LT-LFP 300 batteries demonstrated discharge capacity about ~67% even at –40 о C. When the temperature was increased again to positive values, full recovery of the former values of discharge capacity was observed. After 500 cycles at the normalized discharge current of 0.2 С with discharge depth of ≤ 80%, the discharge capacity of LT-LFP 300 gradually stabilized at the level of 85-90% in respect to initial value. Operational characteristics of the LT-LFP 300 batteries comply with similar products of other world companies. The lithium-iron-phosphate-based batteries produced by “Liotech” Co., Ltd. were successfully tried as an autonomous power supply in electric vehicles and stationary energy storage systems.