There’s a real competition going on between battery manufacturers to develop better batteries for electric vehicles. One of those companies is Gotion High-Tech, who have recently launched a new battery, which the company claims will give electric vehicles the ability to drive for up to 1000km between charges. To develop the L600 Astroinno battery cell and pack, the company decided to use a new chemistry, lithium iron manganese phosphate (LMFP) instead of the lithium ferro phosphate (‘LFP’) chemistry that has previously been used to create lithium-ion batteries (LIB). Until now, LFP batteries have provided vehicle designers with an optimal balance of safety, cost and durability. However, it has proven difficult to get more performance out of the technology, especially in terms of capacity, which in EV terms equals range.
Dr. Cheng Qian, Executive President of the International Business Unit of Gotion High-Tech, explained "LFP market share continues to increase. Meanwhile, the energy density growth of mass-produced LFP batteries has encountered bottlenecks, and further improvement requires an upgrade of the chemical system. Lithium iron manganese phosphate (LMFP) technology was developed to overcome those barriers."
The company’s new Astroinno L600 LMFP battery has a weight energy density of 240Wh/kg, a volume energy density of 525Wh/L, a cycle life of 4000 times at room temperature and 1800 times at high temperatures. The volumetric cell to pack ratio is up to 76%, and the system energy density is around 190Wh/kg.
Gotion High-Tech has spent the last ten years improving lithium manganese iron phosphate (LMFP) materials. For example, the company has introduced Mn dissolution at high temperatures, solved the problems of low conductivity and low compaction density using co-precipitation, while developing doping encapsulation technology, and new granulation technology and electrolyte additives.
In addition to the innovation found in the battery cell, there are also several technical breakthroughs in the company’s supporting Astroinno battery pack. It uses sandwich-structure double-sided liquid cooling technology and cuts the number of structural parts by 45%, as well as lowering the weight of the structural parts by 32%. The length of the battery pack wiring harness has dropped from 303 meters to 80 meters, and the pack energy density is 190Wh/kg.
The Astroinno battery pack is also designed for safety, as the thermal decomposition temperature of the materials it uses is much higher than that of ternary materials, which makes the materials intrinsically safe, with the in-house thermal insulation materials being able to withstand up to 1200°C. It also provides four layers of safety protection through rapid heat exhausting channels set for extreme circumstances and an active safety BMS. The pack has has passed all necessary penetration, hot box, overcharge, over-discharge, thermal runaway, crush, and short circuit tests.
The LMFP Astroinno L600 battery cell is scheduled to begin mass production in 2024, and recently, Gotion High-Tech’s subsidiary, Hefei Gotion High-Tech Power Energy Co has become a designated supplier for Volkswagen's overseas markets.